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Manual Emerson 848L

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  • Emerson 848L - page 1

    www .rosemount.com Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L Logic T ransmitter with F OUNDATION ™ Fieldbus P r o d u c t D i s c o n t i n u e d ...

  • Emerson 848L - page 2

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Rosemount 848L Discrete Logic T emperature T ransmitter with F OUNDATION Fieldbus Cover photo: 848-848C004 NOTICE Read this manual before working with the product. For personal and system safety , and for optimum product performance, make sure to thoroughly un ...

  • Emerson 848L - page 3

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com T able of Content s SECTION 1 Introduction Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • Emerson 848L - page 4

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L TOC -2 SECTION 4 Operation and Maintenance Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Foundation Fiel ...

  • Emerson 848L - page 5

    Reference Manual 00809-0100-4696, Rev AA September 2004 TOC -3 Rosemount 848L APPENDIX D Logic Equation Syntax Error Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-5 APPENDIX E M ...

  • Emerson 848L - page 6

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L TOC -4 ...

  • Emerson 848L - page 7

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Section 1 Introduction Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1- 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2 Return of Materials . . . . . . . . . . . . . . . ...

  • Emerson 848L - page 8

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 1-2 OVERVIEW T ransmitter The 848L provides a cost effective field mounted interface for discrete input s and outputs on a Foundat ion Fieldbus H1 network. The 848L allows you to leverage the fieldbus network to reduce discrete input and output wiring and eliminate the need for ...

  • Emerson 848L - page 9

    Reference Manual 00809-0100-4696, Rev AA September 2004 1-3 Rosemount 848L Appendix A: S pecification and Reference Data • S pecifications • Dimensional Drawings • Ordering Information Appendix B: Product Certificates • Hazardous Locations Certificates • Intrinsically Safe and N on-Incendive Installations • Installation Drawings Appendi ...

  • Emerson 848L - page 10

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 1-4 ...

  • Emerson 848L - page 11

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Section 2 Inst allation Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1 Wiring . . . . . . . . . . . . . . . . . . . . . ...

  • Emerson 848L - page 12

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 2-2 Mounting to a DIN Rail Without an Enclosure T o mount the 848L to a DIN rail without an enclosure, follow these steps: 1. Pull up the DIN rail mounting clip located on the top back side of the transmitter . 2. Hinge the DIN rail into the slots on the bottom of the transmitte ...

  • Emerson 848L - page 13

    Reference Manual 00809-0100-4696, Rev AA September 2004 2-3 Rosemount 848L Mounting to a 2-Inch Pipe St and Use the optional mounting bracket (option code B6) to mount the 848L to a 2-inch pipe stand when using a junction box. Aluminum/Plastic Junction Box (styles JA and JP) St ainless Steel Junction Box (style JS) Fro n t Vie w Si de Vie w Fron t ...

  • Emerson 848L - page 14

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 2-4 WIRING If the device or sensors are installed in a high-voltage environment and a fault condition or installation error occurs, the sensor leads and transmitter terminals could carry lethal voltages. Use extreme caution when making contact with the leads and terminals. NOTE ...

  • Emerson 848L - page 15

    Reference Manual 00809-0100-4696, Rev AA September 2004 2-5 Rosemount 848L Figure 2-4. “Bus” location on the Rosemount 848L Input/Output Power: The discrete I/O requires a 9-32VDC powe r supply that is separate from the fieldbus power . The voltage level will depend on the type of sensors being used and outputs being dr iven. T o power the I/O: ...

  • Emerson 848L - page 16

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 2-6 Security After configuring the transmitter , the data can be protected from unwarranted changes. Each 848L is equipped with a security switch that can be positioned “ON” to prevent the accidental or deliberate change of configuration dat a. This switch is located on the ...

  • Emerson 848L - page 17

    Reference Manual 00809-0100-4696, Rev AA September 2004 2-7 Rosemount 848L I/O WIRING 848/848L/848L_10_AA, 84 8L_1 1_AA, 848L_12_AA , 848L_13_AA, 848L_14_AA.EPS DISCRETE INPUT WIRING CONFIGURATION 2-Wire NAMUR Sensors 1 of 2 Input Connectors Dry Contact Switches 1 of 2 Input Connectors 3-Wire NAMUR Sensors 1 of 2 Input Connectors 9-32 VDC Sensors 1 ...

  • Emerson 848L - page 18

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 2-8 T AGGING Commissioning T ag The 848L is supplied with a removable commissioning tag that cont ains both the Device ID (the unique code that iden tifies a particular device in the absence of a device tag) and a sp ace to record the device tag (the operational identification f ...

  • Emerson 848L - page 19

    Reference Manual 00809-0100-4696, Rev AA September 2004 2-9 Rosemount 848L T RANSMITTER LABEL Figure 2-7. T ransmitter Label INST ALLATION Using Cable Glands Use the following steps to inst all the 848L with Cable Glands: 1. Remove the junction box cover by unscrewing the four cover screws. 2. Run the sensor and power/signal wires through the appro ...

  • Emerson 848L - page 20

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 2-10 Using Conduit Entries Use the following steps to inst all the 848L with Conduit Entries: 1. Remove the junction box cover by unscrewing the four cover screws. 2. Remove the five conduit plugs a nd install five conduit fittings (supplied by the installer). 3. Run sensor and ...

  • Emerson 848L - page 21

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Section 3 Configuration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1 Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1 General Block Information . . . . . . . . . . . . ...

  • Emerson 848L - page 22

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-2 GENERAL BLOCK INFORMATION Modes The Resource, T ransducer , and all functi on blocks in the device have modes of operation. These modes govern the o peration of the block. Every block supports both automatic (AUT O) and out of service (OOS) modes. Other modes may also be sup ...

  • Emerson 848L - page 23

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-3 Rosemount 848L Link Active Scheduler The Rosemount 848L can be designated to act as the backup Link Active Scheduler (LAS) in the event that the LAS is disconnected from the segment. As the backup LAS, the Rosemount 848L will take over the management of communications until the host is res ...

  • Emerson 848L - page 24

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-4 Cap abilities Virtual Communication Relationship (VCRs) There are a total of 20 VCRs. T wo are permanent and 18 are fully configurable by the host system. 25 link objects are available. Host timer recommendations T1 = 96000 T2 = 1920000 T3 = 480000 Block Execution times Disc ...

  • Emerson 848L - page 25

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-5 Rosemount 848L SOFT WRITE LOCK and HARD WRITE LOCK Inputs to the security and write lock f unctions include the hardware security switch, the hardware and software write lock bit s of the FEA TURE_SEL parameter , the WRITE_LOCK parame ter , and the DEFINE_WRITE_LOCK para m ete r . The WRIT ...

  • Emerson 848L - page 26

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-6 PlantWeb ™ Alarms The Resource Block will act as a coordinator for PlantWeb alarms. There will be three alarm parameters (F AILED_ALARM, MAINT_ALARM, and ADVISE_ALARM) which will contain inform ation regarding some of the device errors which are detected by the tran smitte ...

  • Emerson 848L - page 27

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-7 Rosemount 848L MAINT_ALARMS A maintenance alarm indicates the device or some part of the device needs maintenance soon. If the condition is ignored, the device will eventually fail. There are five parameters associ ated with MAINT_ALARMS, they are described below . MAINT_ENABLED The MAINT_ ...

  • Emerson 848L - page 28

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-8 ADVISE_ACTIVE The ADVISE_ACTIVE parameter displays which of the advisories is active. Only the advisory with the highe st priority will be displayed. This priority is not the same as the ADVISE_PRI parameter described above. This priority is not user configurable. ADVISE_ALM ...

  • Emerson 848L - page 29

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-9 Rosemount 848L Alarms Use the following steps to configure the alarms, which are located in the Resource Block. 1. Set the resource blo ck to OOS. 2. Set WRITE_PRI to the appropriat e alarm level (WRITE_PRI has a selectable range of priorities from 0 to 15. Set the other block alarm parame ...

  • Emerson 848L - page 30

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-10 The 848L can force the outputs to a pred etermined state in the event of a device malfunction. The following procedure can be used to set the fail safe condition for each output: 1. Set MODE_BLK.T ARGET to OOS 2. For each Output "n" select the parameter OUT_n_CONF ...

  • Emerson 848L - page 31

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-1 1 Rosemount 848L Figure 3-1. 848L Logic T ransmitter Data Flow Logic T ransducer Block H a rdwa re I nputs H a rdwa re O utput s IN_1 IN_2 IN_3 IN_4 IN_5 IN_6 IN_7 IN_8 OUT_ 1 OUT_ 2 OUT_ 3 OUT_ 4 16 Logic Equations 4 Output Equations EQ_ 1 E Q_16 DI Block DO Block DO Ch ann el An y DO --- ...

  • Emerson 848L - page 32

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-12 The following characters are allowed in a logic equation: • Uppercase and lowercase alphabet, case insensitive, used to specify functions • Digits 0-9, used to specify c hannel numbers and unsigned integer constant s • Comma, used to separate parameters in a function ...

  • Emerson 848L - page 33

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-13 Rosemount 848L PS - When the hardware input consists of a continuous train of pulses at a rate less than 500 PPS, a prescaler can be used to reduce the pulse rate to something that does not change faster than the equation evaluation rate. The function is PS (i, divisor) where ‘i’ is t ...

  • Emerson 848L - page 34

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-14 EQ - Channels 17-32 are set by the result of an equation specified by up to 80 characters and stored in parameter EQx, where x is the equation number . The equation results are available as a discrete value and st atus in parameter EQx_V ALUE. They may be referenced by the ...

  • Emerson 848L - page 35

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-15 Rosemount 848L Logic Functions A function has a name and a set of one or more arguments cont ained within a closed set of parentheses. The seven channel reference functions (IN, ICF , ICR, PS, DO, EQ, and OUT) have been described above. These are the only functions that take a channel num ...

  • Emerson 848L - page 36

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-16 Logic Operator Functions The following combinatorial operators require a minimum of 2 and a maximum of 10 functions between the parentheses, each separated by a comma. AND ( ) - Performs the logical ‘and’ of the argument functions. OR ( ) - Performs the logical ‘or ? ...

  • Emerson 848L - page 37

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-17 Rosemount 848L Counter Functions CTU (clock, reset, t arget)- The parameters clock and reset are functions. The target is a 16 bit const ant. Whenever reset is true, the internal counter is set to zero and the value of the function is false. The value of clock is ignored while reset is tr ...

  • Emerson 848L - page 38

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-18 TP (power , target) - Whenever power transi tions from false to true, the value of the internal timer is set to the tar get and the value of the function is true. The value of the function will become fals e after the t arget amount of time has elapsed. This function is sim ...

  • Emerson 848L - page 39

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-19 Rosemount 848L SHR (input, shift, reset, testbit) - The parameters input, shift and reset are functions. The parameter testbit is a const ant that is constrained to be in the range of 1 to 8. The reset function is optional. If rese t is present and true, the 8 bit register is cleared to z ...

  • Emerson 848L - page 40

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-20 Logic Execution T iming The Logic transducer block reads t he hardware inputs, processes the equations and drives the outputs on a continuous cycle. The cycle time or frequency of execution will vary dependi ng on the number and type of logic functions used in the equations ...

  • Emerson 848L - page 41

    Reference Manual 00809-0100-4696, Rev AA September 2004 3-21 Rosemount 848L Simulation Simulation replaces the channel value coming from the transducer block for testing purposes. The following procedure is us ed to simulate a DI output. T o change the output value place the T a rget Mode of th e block to Manual and then change the OUT_D. V ALUE to ...

  • Emerson 848L - page 42

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L 3-22 ...

  • Emerson 848L - page 43

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Section 4 Operation and Maintenance Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-1 Foundation Fieldbus Information . . . . . . . . . . . . . . . . . . . page 4-1 Hardware Maintenanc e . . . . . . . . . . . . . . . . ...

  • Emerson 848L - page 44

    Reference Manual 000809-0100-4696, Rev AA September 2004 Rosemount 848L 4-2 Commissioning (Addressing) T o be able to setup, configure, and h ave a device communicate with other devices on a segment, a device mu st be assigned a permanent address. Unless requested otherwise, it is assigned a temporary address when shipped from the factory . If ther ...

  • Emerson 848L - page 45

    Reference Manual 00809-0100-4696, Rev AA September 2004 4-3 Rosemount 848L T ROUBLESHOOTING F OUNDATION Fieldbus Resource Block I/O T ransducer and Logic Block T roubleshooting NAMUR Sensors Symptom Possible Cause Corrective Action Device does not show up in the live list Network configuration parameters are incorrect Set the network parameters of ...

  • Emerson 848L - page 46

    Reference Manual 00809-0100-4696, Rev AA September 2004 4-4 Rosemount 848L ...

  • Emerson 848L - page 47

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Appendix A Reference Dat a Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-1 Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-5 Ordering Information . . . . . . . . . . . . . . . . ...

  • Emerson 848L - page 48

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L A-2 Output s 4 Discrete Outputs 9-32 VDC loads Maximum load inductance 300 mH Current Ratings: 1.0 A maximum for single channel on, 4.0 A maximum per device. Output devices must be selected as follows: 1. Designed to use the same DC voltage as supplied to the 848L I/O power term ...

  • Emerson 848L - page 49

    Reference Manual 00809-0100-4696, Rev AA September 2004 A-3 Rosemount 848L Isolation Input-Output 1200 VDC; 600 V rms 50/60 Hz for dry and 2-wire NAMUR contact input s No isolation when using 3-wire sensors Input- Foundation Fieldbus 1200 VDC; 600 V rms 50/60 Hz Output- Foundation Fieldbus 1200 VDC; 600 V rms 50/60 Hz Input power- Foundation Fieldb ...

  • Emerson 848L - page 50

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L A-4 Physical Specifications Environment al Ratings Electronics (no enclosure) -40°C to +85°C 99% non-condensing humidity IP20 Unit (electronics and enclosure) -40°C to +85°C 100% condensing humidity IP66 Function Blocks Specification H1 Segment Device Back-up LAS Resource Bl ...

  • Emerson 848L - page 51

    Reference Manual 00809-0100-4696, Rev AA September 2004 A-5 Rosemount 848L EXAMPLE FOR THE LOGIC EXECUTION: This diagram shows motor starter logi c with st art and stop buttons and an auxiliary contact which maint ains current after the start button is pressed. Which would translate to a Boolean equation of: AND(IN(1),OR(IN(2),IN(3))) DIMENSIONAL D ...

  • Emerson 848L - page 52

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L A-6 Figure A-3. Rosemount 848L Wiring Diagram 848/848L/848L_10_AA, 848L_1 1_AA, 848L_12_AA, 848L _13_AA, 848L_14_AA.EPS DISCRETE INPUT WIRING CONFIGURATION 2-Wire NAMUR Sensors 1 of 2 Input Connectors Dry Contact Switches 1 of 2 Input Connectors 3-Wire NAMUR Sensors 1 of 2 Input ...

  • Emerson 848L - page 53

    Reference Manual 00809-0100-4696, Rev AA September 2004 A-7 Rosemount 848L ORDERING INFORMATION Model Product Description (Includes One Fieldbus H1 Segment) 848L Fieldbus Logic T ransmitter Code Communications Protocol F F OUNDATION ™ fieldbus digital signal (includes 8 DI, 4 DO, 1 MDI, and 1 MDO functi on blocks, and Backup Link Active Scheduler ...

  • Emerson 848L - page 54

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L A-8 ...

  • Emerson 848L - page 55

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Appendix B Product Certifications Approved Manufacturing Locations . . . . . . . . . . . . . . . . . page B-1 European Directive Informat ion . . . . . . . . . . . . . . . . . . . . page B-1 Hazardous Locations Certif icates . . . . . . . . . . . . . . . . . . ...

  • Emerson 848L - page 56

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L B-2 European Approvals CENELEC Approvals N1 CENELEC T ype n Certification Number: Baseefa04A TEX0027X A TEX Marking II 3 G EEx nA nL IIC T4 (T amb = –40°C to 50°C) Power/Bus Max Supply V oltage = 32.0 V Special Conditions for Safe Use (x): 1. The ambient temperature range of ...

  • Emerson 848L - page 57

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Appendix C Function Blocks Resource Block Parameters . . . . . . . . . . . . . . . . . . . . . . . page C-1 I/O T ransducer Parameters . . . . . . . . . . . . . . . . . . . . . . . . p age C-5 Logic T ransducer Parameters . . . . . . . . . . . . . . . . . . . ...

  • Emerson 848L - page 58

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L C-2 23 NV_ CYCLE_T Minimum time interval specif ied by the manufacturer for writing copies of NV parameters to non-volatile memory . Zero means it will never be automatically copied. At the end of NV_ CYCLE_T , only those parameters which have changed need to be updated in NVRAM ...

  • Emerson 848L - page 59

    Reference Manual 00809-0100-4696, Rev AA September 2004 C-3 Rosemount 848L 53 OUTPUT_ BOARD_ SN Output board serial number . 54 FINAL_ ASSY_ NUM The same final assembly number specified or set by the customer . 55 DET AILED_ ST A TUS Indicates the state of the transmitter . 56 SUMMARY_ ST A TUS An enumerated value of repair analysis. 57 MESSAGE_ DA ...

  • Emerson 848L - page 60

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L C-4 80 ADVISE_ ENABLE Enabled ADVISE_ ALM alarm conditio ns. Corresponds bit for bit to AD VISE_ ACTIVE. A bit on means that the corresponding alarm condition is enabled and wi ll be detected. A bit off means the corresponding alarm condition is disabled and will not be detected ...

  • Emerson 848L - page 61

    Reference Manual 00809-0100-4696, Rev AA September 2004 C-5 Rosemount 848L I/O T RANSDUCER PARAMETERS T able C-2. I/O Transducer Parameters Numbe r Parameter Description 1 ST_ REV The revision level of the static data associated with the function block. 2 T AG_ DESC The user description of the intended application of the block. 3 STRA TEGY The stra ...

  • Emerson 848L - page 62

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L C-6 29 TRANSDUCER_ TYPE_ 2 Identifies the transducer that follows. 30 XD_ ERROR_ 2 One of the error codes defined in FF-9 03 XD_ ERROR and Block Alarm Subcodes. 31 COLLECTION_ DIRECTOR Y_ 2 A directory that specifies the number , starting indices, and DD item IDs of the dat a co ...

  • Emerson 848L - page 63

    Reference Manual 00809-0100-4696, Rev AA September 2004 C-7 Rosemount 848L 57 OUT_ 3_ T AG An identifier asso ciated with discrete output 3. 58 OUT3 The value and status of discrete Output 3. 59 OUT_ 3_ CONFIG .IO_TYPE The transducer type of discrete sensor 1 1. 59 OUT_3_CONFIG .FIL T ER Any state change that lasts for a duration less than this fil ...

  • Emerson 848L - page 64

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L C-8 LOGIC T RANSDUCER PARAMETERS T able C-3. Logic Transducer Parameters and Descriptions Number Parameter Description 1 ST_ REV The revision level of the static data associated with the function block. 2 T AG_ DESC The user description of the intended application of the block. ...

  • Emerson 848L - page 65

    Reference Manual 00809-0100-4696, Rev AA September 2004 C-9 Rosemount 848L DISCRETE INPUT BLOCK The DI takes the manu facturer ’s discrete input dat a, selected by channel number , and makes it available to other function blocks as its output. The output will have a value of either true or false along with the status of the output. A custom featu ...

  • Emerson 848L - page 66

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L C-10 T able C-4. Parameters Index Parameter 1S T _ R E V 2 T AG_DESC 3S T R A T E G Y 4 ALERT_KEY 5 MODE_BLK 6 BLOCK_ERR 7P V _ D 8 OUT_D 9 SIMULA TE_D 10 XD_ST A TE 1 1 OUT_ST A TE 12 GRANT_DENY 13 IO_OPTS 14 ST A TUS_OPTS 15 CHANNEL 16 PV_FTIME 17 FIELD_V AL_D 18 UPDA TE_EVT 1 ...

  • Emerson 848L - page 67

    Reference Manual 00809-0100-4696, Rev AA September 2004 C-1 1 Rosemount 848L DISCRETE OUTPUT BLOCK The DO block makes the value sent in SP_D, CAS_IN_D, or RCAS_IN_D available for processing by the device. The CHANNEL selection determines where the value is stored in the 848L. A custom feature of the DO block in the 848L is the ability to accept 8 s ...

  • Emerson 848L - page 68

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L C-12 T able C-5. Parameters MULTIPLE DISCRETE INPUT BLOCKS The MDI block makes available for the FF network eight discrete variables of the I/O subsystem through its eight ou tput parameters OUT_D1/8 S tatus indication in the OUT_Dx output para meters depends on the I/O subsyste ...

  • Emerson 848L - page 69

    Reference Manual 00809-0100-4696, Rev AA September 2004 C-13 Rosemount 848L T able C-6. Parameters and Description MULTIPLE DISCRETE OUTPUT BLOCK The MDO block makes available to the I/O subsystem its eight input parameters IN_D1/8. This function block keeps the fault st ate features specified for the DO block. It includes option to hold the last v ...

  • Emerson 848L - page 70

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L C-14 T able C-7. Parameters and Description IN_D3 BLOCK ALGORITHM CHANNEL OUTPUT SNAP OF TRANSDUCER BLOCK INPUTS IN_D4 IN_D5 IN_D6 IN_D7 IN_D8 IN_D1 IN_D2 848/848L/DISCRETE3.EPS Index Parameter 1S T _ R E V 2 T AG_DESC 3S T R A T E G Y 4 ALERT_KEY 5 MODE_BLK 6 BLOCK_ERR 7 CHANNE ...

  • Emerson 848L - page 71

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Appendix D Logic Equation Synt ax Error Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-4 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-5 1. All lines shall end with a semi-c ...

  • Emerson 848L - page 72

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L D-2 T able D-1. Supported Functions Function Name Required number of parameters Maximum number of parameters Function Description Maximum Instances AND 2 10 AND (a, b,...); This function's result will be the logical and of a, b,... NO LIMIT CLOCK 2 2 CLOCK (onT ime, offTime ...

  • Emerson 848L - page 73

    Reference Manual 00809-0100-4696, Rev AA September 2004 D-3 Rosemount 848L PS 2 2 PS (channel number , divisor); This function is a frequency pr escaler . This function's value will be true for 1 execution cycle each time the requested device input has had 'divisor' pulses. This is ideal for a scaling fast pulse in puts to a rate sui ...

  • Emerson 848L - page 74

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L D-4 ERROR HANDLING The syntax of the entered equation is p arsed when the target mode transitions from OOS to AUTO. Each equation is c hecked in order , and when an error is encountered in an equation, the pars ing is suspended for the remaining equations, and the target mode is ...

  • Emerson 848L - page 75

    Reference Manual 00809-0100-4696, Rev AA September 2004 D-5 Rosemount 848L EXAMPLES T ake value of input 1 and put it on output 3.... Set OUT3_EQ to: IN(1); For every transition (in both directions) on input 5, send a 200 msec pulse out on output 2, but only if inpu t 2 is low .... Set OUT2_EQ to: AND(OR(TP(IN(5),2),TP(NOT(IN(5)),2)),NOT(IN(2))); T ...

  • Emerson 848L - page 76

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L D-6 ...

  • Emerson 848L - page 77

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Appendix E Motor Control Introduction to Moto r Control . . . . . . . . . . . . . . . . . . . . . . p age E-1 V ariations on Motor Control . . . . . . . . . . . . . . . . . . . . . . . page E-2 Writing 848L Equations . . . . . . . . . . . . . . . . . . . . . . ...

  • Emerson 848L - page 78

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L E-2 The contactor is never controlled with a toggle switch, because that would leave one side of the solenoid electrically hot when the motor overload trips. S tandard procedure calls for st art and st op push buttons in combination with an auxiliary contact on the cont actor . ...

  • Emerson 848L - page 79

    Reference Manual 00809-0100-4696, Rev AA September 2004 E-3 Rosemount 848L Rest art Delay A motor may be used in a condition wher e starting is dif ficult, causing the motor to heat rapidly until it gets r unning. That heat must be allowed to dissipate before the motor is st arted a gain. A simple time delay prevents the start button from working u ...

  • Emerson 848L - page 80

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L E-4 Timed Switch The pumps have a known life time within an accept able risk, so one pump is allowed to run until that time expires. The other pump automatically takes over at that time. Switch on Failure If a process condition can be sensed that says the running pump failed, th ...

  • Emerson 848L - page 81

    Reference Manual 00809-0100-4696, Rev AA September 2004 E-5 Rosemount 848L Interlock An interlock switch is easily added as follows, where input 4 is the normally closed interlock: | | | 1 2 4 Out1 | +--| |--+--||--+--|/|-----------------( )--+ OUT1_EQ | | | | | | 3 | | | +--||--+ | | | • The first expression is still OR(IN(2),IN(3)) • The top ...

  • Emerson 848L - page 82

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L E-6 Rest art Delay An off delay timer is required as a permissive for st arting the motor . When the motor is started, the of f delay contact opens the circuit for the start button and keeps it open for a specified time. The motor will be cooled as it runs, so the delay is only ...

  • Emerson 848L - page 83

    Reference Manual 00809-0100-4696, Rev AA September 2004 E-7 Rosemount 848L Maximum Rest arts A large motor is too expensive to replace if it burns up because the operator wanted to give it another try , when in fact the pump was jammed. The life of the contactor is also shortened when it has to interrupt locked rotor current. In this case, it is no ...

  • Emerson 848L - page 84

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L E-8 Winding T emperature The multi-rung delay mechanism above may be replaced if the motor has a winding temperature sensor and a conv ertor that opens a contact when the motor is too hot and closes when it is sufficiently cool. The following drawing applies such a contact (as i ...

  • Emerson 848L - page 85

    Reference Manual 00809-0100-4696, Rev AA September 2004 E-9 Rosemount 848L Hand-Off-Auto The HOA switch has one contact that is closed in the Hand position (input 1) and one contact that is clos ed in the Auto position (input 2). Both contact s are open in the Off position. The local hand c ontrols are S top (input 3) and S tart (input 4). These re ...

  • Emerson 848L - page 86

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L E-10 Intermediate Stop A reversible motor requires two contac tors. One of them swap s two of the motor wires so that it will run in the opposite direction. The contactors must never be closed at the same time, because that would place a short circuit across one of the three pha ...

  • Emerson 848L - page 87

    Reference Manual 00809-0100-4696, Rev AA September 2004 E-1 1 Rosemount 848L Redundant Motors - Alternate St art T wo motors drive two pumps in a redundant configuration. The control valve that follows the pumps will just waste the energy of the second pump, possibly damaging the valve, if both pumps on at the same time. There are times when neithe ...

  • Emerson 848L - page 88

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L E-12 Redundant Motors - Timed Switch Again, redundant pumps are used but on ly one pump runs at a time. The process runs for years without being shut down. The switch between pumps occurs at a time near the end of the useful life of the pump, usually several thousand hours. S to ...

  • Emerson 848L - page 89

    Reference Manual 00809-0100-4696, Rev AA September 2004 E-13 Rosemount 848L Rung L1 is equation 1. It latches on when the start button is true and unlatches when the NC stop button is pushed. The latch remembers start and stop commands to simplify the logic. • The expression is RS(IN(2),NOT(IN(1))); Rung P1 is equation 2, which generates a pulse ...

  • Emerson 848L - page 90

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L E-14 Redundant Motors - Switch on Failure Again, there are redundant pumps. There is a pressure switch in the common discharge line. If the pressure falls then the other pump is started. If the pressure does not recover , possibly because a flammable liquid is pouring on the gro ...

  • Emerson 848L - page 91

    Reference Manual 00809-0100-4696, Rev AA September 2004 E-15 Rosemount 848L Rung L1 is equation 1. It latches on when the start button is true and neither motor is running. It unlatches when the NC stop button is pushed or the pressure stays low for too long. • The expression is RS(AND(NOT(IN(3)), NOT(IN(4)),IN(2)),OR(NOT(IN(1)),EQ(3)); Rung P is ...

  • Emerson 848L - page 92

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L E-16 ...

  • Emerson 848L - page 93

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L www .rosemount.com Appendix F V alve Control Introduction to V alve Contro l . . . . . . . . . . . . . . . . . . . . . . page F-1 INTRODUCTION TO V ALVE CONTROL Industrial valves have two general classifications, regulating and block. A regulating valve is designed to be stable ...

  • Emerson 848L - page 94

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L F-2 There are at least three permu tations of any valve circuit: 1. S teady or pulse output to the pilot solenoid (or whatever , piezoelectric bars are in use). S teady requires one output, pulse requires two. 2. Confirmed position switches for open, closed or both, using one or ...

  • Emerson 848L - page 95

    Reference Manual 00809-0100-4696, Rev AA September 2004 F-3 Rosemount 848L Double Block and Bleed If the valve absolutely must not leak into the process, then two valves are put in series and the short pipe between them is vented (bled) to an appropriate place. The bleed valve must be shut before the main valves can be opened, and the main valves m ...

  • Emerson 848L - page 96

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L F-4 Open-Auto-Close Those applications that use a local swit ch with automatic control have a three position switch arranged as Open-Auto -Close. Inputs 1 and 2 are used for confirms, so input 3 is used for Open and input 4 for Closed. No input is required for Auto. • The Bool ...

  • Emerson 848L - page 97

    Reference Manual 00809-0100-4696, Rev AA September 2004 F-5 Rosemount 848L Simple V alve V ariations A spring return valve with one close confirm: EQ1 contains TON(OR(AND(NOT(DO(1)),NOT(IN(2))),AND(DO(1),IN(2))),100); OUT1 contains DO(1); The fourth similar spring retu rn valve in the same 848L: EQ4 contains TON(OR(AND(NOT(DO(4),NOT(IN(8))),AND(DO( ...

  • Emerson 848L - page 98

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L F-6 Double Block and Bleed Certain materials must not leak through a valve that is supposed to be shut. Three valves are arranged in a leak-proof configuration as shown: All three valves are spring return. V1 and V2 return to closed, V3 returns to open. All 3 valves must have cl ...

  • Emerson 848L - page 99

    Reference Manual 00809-0100-4696, Rev AA September 2004 F-7 Rosemount 848L Motorized V alve The motor runs forward to open the va lve and reverse to close it. When the motor is off, the valve cannot move. Bo th confirms are required. Output 1 causes the motor to run forward, Output 2 is reverse. Only one output must be active at a time. Input 1 con ...

  • Emerson 848L - page 100

    Reference Manual 00809-0100-4696, Rev AA September 2004 Rosemount 848L F-8 ...

  • Emerson 848L - page 101

    Reference Manual 00809-0100-4696, Rev AA 9/17/04 Rosemount 848L www .rosemount.com Inde x Numerics 2-Inch Pipe S tand Mounting . . . . . . . . . . . . . . . . . . 2-3 A ADVISE_ACTIVE . . . . . . . . . . . . . 3-8 ADVISE_ALM . . . . . . . . . . . . . . . . 3-8 ADVISE_ENABLED . . . . . . . . . . . 3-7 ADVISE_MASK . . . . . . . . . . . . . . 3-7 ADVIS ...

  • Emerson 848L - page 102

    Reference Manual 00809-0100-4696, Rev AA 9/17/04 Rosemount 848L Index-2 H Hardware Maintenance . . . . . . . . . . . . . . . 4-2 Communication Check . . . . 4-2 Power Check . . . . . . . . . . . 4-2 Reset Configuration . . . . . . 4-2 Sensor Check . . . . . . . . . . . 4-2 I I/O T ransducer Parameters . . . . . . . . . . . . . . . . C-5 Installatio ...

  • Emerson 848L - page 103

    Reference Manual 00809-0100-4696, Rev AA 9/17/04 Index-3 Rosemount 848L T T agging . . . . . . . . . . . . . . . . . . . . . 2-8 Commissioning . . . . . . . . . . . . . 2-8 Sensor . . . . . . . . . . . . . . . . . . . 2-8 T ransmitter . . . . . . . . . . . . . . . . 2-8 T imer Recommendations, Host . . 3-4 T ransients . . . . . . . . . . . . . . . ...

  • Emerson 848L - page 104

    Reference Manual 00809-0100-4696, Rev AA 9/17/04 Rosemount 848L Index-4 ...

  • Emerson 848L - page 105

    Emerson Process Management © 2004 Rosemount Inc. All rights reserved. ¢00809-0100-4697F¤ Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc. PlantWeb is a registered trademark of one of t he Emerson Process Management group of comp anies. All other marks are the property of their respective owners. Reference Manual 0 ...

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