Programmable Logic Controller Gateway Control Functions
Contents
1. L Reverse Indication Direct Indication In this chart dual input states are given in input 1 input 2 order input 1 is the subslot specified and input 2 is that subslot plus one These abbreviations are used for parameter names and values ST1 and ST2 mean STATE1 and STATE2 ZZT means ZZTEXT CZZT means the complement of the value in ZZTEXT The integers in the LCN Ordinals column are values that can be accessed by upper level processors through CGs to determine the input states of digital points PLC Gateway Control Functions 3 18 12 97 3 3 3 3 PLCG COUNTER DATA POINTS The PLCG Counter point is primarily a communication mechanism for exchanging data between the TPS Network and a PLC NOT a control point Thus many typical counter functions are not supported and some TPS system point functions are not supported such as trending and some alarm features 1 The only DHP Counter point parameter written to the PLC register is OP after dividing by AVCONV scale factor 2 The value read from the PLC register is available in the AV and OP parameters for the Counter point after scaling by the AVCONV parameter 3 There is no PV Process Variable parameter for a Counter point A PLCG Counter point provides access to a PLC database register using Modbus Function Code 03 Reading Holding Register The register accessed in the PLC need not be a counter or timer but the PLC register value must be a positive integer i2. 02 03 for redundant PLCG HYnnBaa Box Point one per emulated DHP nn network for emulated hiway number and aa box address number 08 15 Hiway DHP Boxes NOTE Digital Composite and Analog Composite points exist in a PLCG but are not structured the same as corresponding Digital Composite and Analog Composite points in the PM APM PLC Gateway Control Functions 2 8 12 97 2 6 3 Parameter Configuration 2 6 3 The following diagram shows the structure of the PLCG as it relates to the parameters in the reserved entities and an example data point DEVICE SUBDIVISION HIWAYn 1 HWYNUM HWYHTD HWYSWINT HWYSWBAS SOESYNCH CDTEXT NCMPTXT1 NCMPTXT2 ENTITY PARAMETER HYnnBaa 2 HWYNUM BOXNUM BOXTYPE BOXASSN LOADDEST EVENTPRC up to 8 numbered 8 15 HYnnBaa 8 BOXNUM BOXTYPE BOXASSN LODDEST BOXSIZE OUTBOXNUM BOXSTART SCANTIME EVENTPRC CHNGFLAG BOXTOG1 BOXTOG2 up to 30 LON gt PLCG BOX p SLOTS J SUBSLOTS p Type Max Points Digital Input Digital Output Analog Input Analog Output Counter PIUCRDTY ALFMT ALPRIOR BOXNUM CALIBOFF CCRANK EIPENB EIPEVENT EIPPCODE EUDESC HWYNUM INPTDIR INPTSSLT KEYWORD LBOXCLR LOADDEST MODE MODEPERM MOOUTIND NAME NMODE OUTIND OUTSLTNM OUTSSLT OVERVAL PCADDR1 PCADDRI2 PCADDRO1 PCADDRO2 PIUCRDTY PNTBOXIN Figure 2 2 PLCG Structure an
3. red tagging and output state definition PLC Gateway Control Functions 3 12 12 97 3 2 2 3 2 2 3 Digital Output Processing A request for a digital output change 1s processed at the next processing pass of the emulated DHP and before the start of a new scan request The requests are checked against the mode attribute and red tag restrictions by the PLCG Once an output state change is affected by the DHP the DHP does a read back check to verify the actual output state on the next data scan and all subsequent data scans change which detect PLC logic 3 2 2 4 Digital Output Initialization A digital output point is initialized when it is restarted During initialization the PLCG reads the actual state of the output and set their internal output state to the corresponding state The emulated DHP reads the state of the coil or defined memory location in the programmable controller The mode in the emulated DHP is set to the same mode as before the point was initialized 3 2 2 5 Digital Output Parameter Descriptions Refer to the PLC Gateway Parameter Reference Dictionary for the full names value ranges default values value types and access levels for each parameter 3 2 3 PLCG Digital I O Composite Data Points A digital I O composite data point consists of one or two digital inputs and one or two digital outputs with the same tag name The input slot and subslots and the output slot and subslots must be in the same emulated DHP
4. 05 Acknowledge ACK No 06 PLC slave device busy Yes 07 Negative Acknowledge NAK No Exception codes 01 02 03 04 05 and 07 will cause the DHP PLCG point to go to a BAD state and fail the entire slot to which it s assigned This does not cause failure of the associated device in the DHP box configuration so points in other slots will function Unless retry is successful all other faults will cause failure of the associated device in the DHP box configuration and all associated points and slots so point data will not be updated until the fault is cleared A failure indication will be reported on the Honeywell system 11 bit character format 1 start 8 data parity 1 stop 11 bits Error checking Parity per character CRC 16 per message packet End of message gap is defined as 3 5 character times or more per Modbus specification PLC Gateway Control Functions 2 11 12 97 2 7 2 7 PLCG DATA POINT CAPACITY The following are configuration limits and restrictions that apply to PLCG data points 2 7 1 Total PLCG Point Capacity If you refer to the MaxPoints column under Subslots in the chart above you can calculate that if all points were digital inputs you could have as many as 16 digital inputs X 30 slots X 8 DHPs 3 840 points in a PLCG however the maximum number of data points that can be built for a PLCG or PLCG pair is 3 000 Each emulated DHP has 30 slots and each slot has four six eight o
5. DHP This box behaves like a DHP The PLCG must be configured as an HG at box BOXPROT Modicon address 02 on the network PC1TYPE M584 Connected device is a Modicon 584 PLC hiway 02 PC1PORT 1 The PLC is connected to PLCG port 1 If this PLCG has a redundant PC1PORTA 17 The PLC Modbus address is 17 partner it too has a box point PIUCRDTY 2 DIGITIN Slot 2 of box 15 serves up to 16 HY02B03 digital input points Data Point As with a physical hiway the PLCG Name PDI0001A nie i ee NUE 15 This input database is stored in PLCG box 15 hiway state displays show SLOTNUM 2 Slot 2 hine 2 ad If there is no INPTSSLT 1 Subslot 1 1 16 backup PLCG the odd hiway PNTBOXIN 1 The PLC index is 1 itis a address is still reserved PNTPCTY MODICON Modicon PLC and the address PCADDRI 1 361 in the PLC where the digital input SPECIFI1 1 value resides is 361 3363 A Figure 2 1 Example of a Digital Input Point PLC Gateway Control Functions 2 7 12 97 2 6 2 2 6 2 Reserved Entities When configuring a PLC for the network you must be sure to configure all required reserved entities There are up to 11 reserved entities names for reserved entities begin with These reserved entities are HIWA Ynn Hiway Point one per PLCG or PLCG redundant pair nn network hiway number HYnnBaa Box Point one per PLCG or each partner of a PLCG for PLCG pair nn network hiway number and aa box address number
6. Level Processing Second Level Processing Analog Output Data Point Modes Associated Dispaly Auxiliary Units B12E TDC System format Backup PLCG Box DHP Control States Box Slot Data Point Names Parameters Processing Relating to PLCs Boxes Emulated DHPs Functions Related to Capacity Data Point PLCG Clamping Options PV Analog Points Composite Data Points Composite Points in One Box PLCG Digital I O Contact Cutout Secondary Points Control Time out Function Counter Data Points Functional Structure Processing Critical Alarm Status DHP Emulated Control States Status Startups Digital Data Points Alarms Composite Data Points Digital Input Points Digital Output Data Points Doorbell Points Momentary Points Summary of States and Alarms Doorbell Digital Points Emergncy Alarms Entities Reserved O1 D BW WO NO DER Oo RDC NE a D ONO DII pH og ENG h N N NON N Oo VOWWNNWY WII NW W W GI NN U CO CD CD CD CD CD CD NN CD CD FO FO Co D SLO SL WAH DORI TSO RODS 09000002 HOUR D NNDNND D DD oww D W PB P PB D AOR PLC Gateway Control Functions Index 1 12 97 Index Topic Section Heading Errors Avoiding Errors Error Codes Errors on Input and Output Requests to PLCs Event Initiated Processing Analog Points Points with EIP Fail COM Box Status Fail HDW Box Status Failover Scenario Fifty Points with Critical Alarm Status Format Decimal Analog values TDC System B12E Functions PLC
7. Typically the inputs show the direct or indirect result of the digital output on the PLC that the output s is wired to NOTE When you view the structure of a composite point with dual inputs or outputs on the Box Point Summary or Unit Point Summary display the second part of the dual point doesn t appear in the table You should assume that it resides in the next consecutive slot because it must be configured there 3 2 3 1 Functional Structure See Figure 3 3 PLC Gateway Control Functions 3 13 12 97 3 2 3 3 2 3 2 Functional Description 3 2 3 2 1 Digital I O Composite Data Point l O Combinations Each digital I O composite data point can be configured for one or two inputs NMBRINPT and one or two outputs NMBROUT The functions for the inputs and outputs are essentially the same as for the individual inputs 3 2 and outputs 3 3 Manual p RR PV HH PVAUTO aac o PV Alarming Alarms t Sub Value in 4 PVSOURCE Inputs Outputs Value in we MODE Man Operator Sts Digital gt ata US Q Conversion O utput o OMU Output State J Data Point o to Digital Output Digital p or Cas Output User Written Program Figure 3 3 Functional Diagram Digital I O Composite Data Point 3 2 3 2 2 Input Detection for Digital VO Composite Points Input detection is the same as described under subsection 3 2 1 4 1 except that only
8. an LCN node that provides a direct interface to any of several Programmable Logic Controllers PLCs available from various manufacturers A single PLCG can be connected through its two ports to up to 16 PLCs The PLCG database is organized into eight logical boxes as viewed by the LCN and the configuration software The PLCG may be provided as a redundant node pair consisting of a primary PLCG backed up by its redundant partner Should the primary PLCG fail its partner takes over all of the failed node s functions using the current database In the case of Allen Bradley PLCs the redundant PLCG configuration may use only point 1 A PLCG can handle up to 3 000 LCN data points of these seven types e Analog Input e Digital Input e Analog Output e Digital Output e Analog Composite e Digital Composite Counter timer Some LCN data points composite points use two or more memory locations in the PLCG therefore when these types are used the capacity is limited to 240 point database slots Functionally the PLCG is similar to the Hiway Gateway HG and it operates on the HG software as is with no modifications The PLCG operates as if it were a Data Hiway with up to eight Data Hiway Ports DHPs All operating and configuration displays for PLCGs are HG displays with no modifications including the HG and DHP terminology DHPs are Data Hiway boxes each an independent hardware module that interface with PLCs The PLCG offers bett
9. from the PLC as well as input values to provide value tracking PLC Gateway Control Functions 3 1 12 97 3 1 3 3 1 3 Processing Order for Analog I O Points Because individual analog I O data point functions reside in different memory locations and the functions are distributed between different software routines there is no apparent processing order 3 1 3 1 Analog I O Point Parameter Descriptions Refer to the PLC Gateway Parameter Reference Dictionary for the full names value ranges default values value types and access levels for these parameters 3 1 3 2 Number of Analog Inputs and Outputs The number of inputs and outputs defines the type of analog tag to be built One input and one output can be configured into the same tag One input and no output is also allowed as is one output and no input Tags with no inputs or outputs are not allowed 3 1 3 3 Data Acquisition The configuration database is built by the PLCG according to port PLC address and point address When configuring the PLCG you are asked to specify the address within the PLC s memory where data for this tag will be read from or written to The format of the address changes depending on the PLC protocol If you use Allen Bradley protocol only an address is required for example address 010 If you use Modicon or Honeywell protocol the address is composed of an address and a specifier The specifier is the first bit of an address expressed in Modbus
10. have three sources Operator changes e Changes from an AM e PLC keep alive addresses PLC Gateway Control Functions 2 6 12 97 2 6 Because such requests can occur anytime the system also performs a retry if appropriate The number of retries allowed is specific to the communications protocol in use ModBus requests are retried twice while Allen Bradley requests are retried three times as recommended by the vendors Please note that a retry is performed anytime there is a transient type error condition Under certain conditions such as configuration errors retries do not alter the results and are therefore suppressed 2 6 PLCG PARAMETER CONFIGURATION 2 6 1 Relating PLCG Boxes and Slots to PLCs and PLC Addresses The PLCG must be configured in this order to work properly 1 Hiway Point 2 Box Points HGbox es then DHP boxes 3 Data Points Each PLCG has up to eight emulated boxes numbered 8 15 each of which contains up to 30 emulated slots and their subslots The PLCG supports up to 3 000 points Figure 2 1 illustrates how for example a digital input point named PDIOO1A would be configured Hiway Point HIWAY02 HWYNUM 02 This PLCG is identified by process network hiway 02 15 a Box Point HY02B15 Box Point LR AR nd HY02B02 HWYNUM 02 This PLCG subdivision is identified as HWYNUM 02 BOXNUM 15 being box 15 on hiway 02 BOXNUM 02 BOXTYPE
11. of the extended range as specified in PVRNGOP PVEXHIFL True Otherwise it is False e PVEXLOFL TIf the PV is below the low end of the extended range as specified in PVRNGOP PVEXLOFL True Otherwise it is False e PV Normally the value in PV represents the magnitude of the process variable For range checking and clamping the PV value in percentage of range is used but the PV can be represented in engineering units on the Universal Station displays The PVRNGOP and PVCLAMP options affect the PV as follows If PVCLAMP NoClamp and the PV is outside the extended range specified by PVRNGOP the PV value is NaN not a number If PVCLAMP Clamp and the PV is outside the extended range specified by PVRNGOP the PV value is clamped at the point at which it exceeded the range When the PV is clamped PVSTS Uncertn e PVSTS PVSTS Normal when these conditions are both true PV is inside the extended range specified by PVRNGOP PVSOURCE Auto PVSTS Uncertn when either of these conditions is true PVSOURCE contains Man or Sub The PV is clamped because it is outside the extended range specified by PVRNGOP and PVCLAMP Clamp PLC Gateway Control Functions 3 6 12 97 PVSTS Bad when both of these conditions are true PVSOURCE Auto PVCLAMP NoClamp and the PV is outside the extended range specified by PVRNGOP If PVSTS Bad the value in PV is NaN 3 1 8 Analog Output Data Point Modes Analog Output Points c
12. whose input slots are in emulated DHPs For an emulated DHP the number of digital input points is limited by the number of I O slots that are configured for digital inputs at 16 for each slot for a maximum of 30 slots for each emulated DHP In any case the number of digital input data points can be restricted by limitations in the PLCG A digital input point reads the status of a discrete from a PLC A dual digital input data point reads the status of two discretes from a PLC NOTE When you view the structure of a composite point with dual inputs or outputs on the Box Point Summary or Unit Point Summary display the second part of the dual point doesn t appear in the table You should assume that it resides in the next consecutive slot because it must be configured there PLC Gateway Control Functions 3 8 12 97 3 2 1 3 2 1 2 Functional Structure of Digital Input Points Manual Conversion RR PV Alarming Substituted o Figure 3 1 Functional Diagram Digital Input Data Points 3 2 1 3 Types of Digital Inputs The TDC 3000X system handles change detection sequence of events and notified status digital inputs PLCGs provide only notified status digital inputs which record changes of the digital input state 3 2 1 4 Functional Description 3 2 1 4 1 Input Detection Input Voltage Levels Contact Bounce Filtering The emulated DHP itself has
13. CGs can also have up to 1 440 analog input points 2 7 6 Points with Event Initiated Processing For standard PLCGs up to 200 data points can be configured for event initiated processing Enhanced 68020 PLCGs can have up to 600 EIP points If you need more information refer to subsection 4 2 in System Control Functions 2 7 7 Contact Cutout Secondary Points Up to 500 points can be configured as secondary cutout points If you need more information refer to subsection 4 3 1 7 in System Control Functions 2 8 SPECIAL PLCG FUNCTIONS This subsection defines specific control functions that are performed by the PLCGs The purpose of the section is to clarify that though these functions may be covered elsewhere in the System HG and AM Control Functions publications they are accomplished by the PLCG 2 8 1 Functions Related to Emulated DHPs 2 8 1 1 Startups The PLCG handles the necessary initialization for all emulated DHPs with the exception of Clearance Hiway Security Errors an address error on the Hiway Status Display This error must be cleared by the operator 2 8 1 2 Control Time Out Function For emulated DHPs the PLCG provides a time out function similar to that of the Extended Controller The box level time out gates are automatically updated by the PLCG as long as the box is in the full control state secondary points in the box are in CAS mode and their primary points in an AM continue to supply new SP or OP values to
14. G Special Related to DHPs Special Related to PLCs Time out Control General Parameter Access Handling Reverse Acting Transmitter Hiway Gateways Hiway Point Parameters Hiway States Idle SF Idle PF Input Points Analog Digital Keep Alive Addressing Modbus Protocol Quick Referece Modes and Attributes Modes Data Point Analog Output Modicon PLCs Momentary Doorbell Digital Points Multifunction Controller Names Box Points Parameters PLCG Analog Composite Analog Input Analog Output Box Slot Counter Digital Composite Digital Input Digital Output Hiway Point PLCG Parameters Configuration una D T She Qo AG nou ND APS RM 60605 IDE D PO RTS DURE TONO N DOUN WMA www Mm w O WN N W UD W W UD LW WWW WO NNW KR BRNO dE ee _ RMD poe va po N WwW wow on DON PLC Gateway Control Functions Index 2 12 97 Index Topic Section Heading PLCs Allen Bradley 2 8 2 2 Modicon 2 8 2 1 PLC Addressing Relating PLCGs to PLCG Counter Point Functional Structure Parameters Processing Points Analog Input Analog I O Contact Cut out Secondary Event Initiated Processing Points with Composite Points in One Box Fifty Points with Critical Alarm Status Momentary Doorbell Digital Points Point Alarming Analog Points Point Capacity PLCG Point Processing Analog I O Point Related Functions Point Types Analog Digital Point Types Process Variable Process Connected Subsystems Spec
15. High PVEUHI During PLCG configuration these values are the number of engineering units that correspond to 0 of range and 100 of range In the above chart 0 0 degrees F 100 1 000 degrees F These values should be configured before alarm limits 3 1 5 2 Decimal Format Decimal Format specifies the number of decimal places in the value displayed on the screen The example below shows how the analog value appears for each selection DO XXXX no decimal places D1 XXX X 1 decimal place D2 XX XX 2 decimal places D3 X XXX 3 decimal places 3 1 5 3 Target Value When configuring the PLCG make this entry in engineering units It is used as a guide to tell operators where they should be operating as well as for calculating deviation alarms 3 1 6 PV Source Selection for Analog I O Points Parameter PVSOURCE indicates one of three sources for the PV It can contain Auto Man or Sub These values indicate which source is in effect as follows e Auto The PV is obtained from its configured source as indicated by PVSLTSRC and PVSIGNAL In this case other points and user programs can t change the PV value e Man The PV is a value entered by a Universal Station operator The operator entered value is checked against its configured limits and if the PV exceeds one of those limits the value is clamped at the limit Either an operator or a user written program can change the PV source to Man The operator can t change the Man valu
16. Honeywell Programmable Logic Controller Gateway Control Functions PLO9 500 Tetal Plant Honeywell Implementation EPLC Gateway Programmable Logic Controller Gateway Control Functions PL09 500 Release 520 12 97 Tetal Plant Copyright Trademarks and Notices Copyright 1995 1997 by Honeywell Inc Revision 04 December 22 1997 While this information is presented in good faith and believed to be accurate Honeywell disclaims the implied warranties of merchantability and fitness for a particular purpose and makes no express warranties except as may be stated in its written agreement with and for its customer In no event is Honeywell liable to anyone for any indirect special or consequential damages The information and specifications in this document are subject to change without notice TotalPlant and TDC 3000 are U S registered trademarks of Honeywell Inc Other brand or product names are trademarks of their respective owners About This Publication This is a reference manual for process engineers control system engineers and application engineers who design and implement data acquisition and control strategies to be accomplished through a TotalPlant Solution TPS system with a Local Control Network This publication defines the data acquisition and control functions that reside in Programmable Logic Controller Gateways and the Programmable Logic Controllers connected to the PLCG This publicat
17. LCG it behaves as if there is a Data Hiway Therefore the emulated Data Hiway appears on the Network Status Display to be in one of these three states e Uncertain e Running e Failed Initially before Data Hiway security checks have been made or when starting up a hiway without a database the status of a emulated hiway is set to Uncertain In the running state interfaces to the hiway are operational and normal communication over the hiway is possible The Network Status display for each Data Hiway shows which logical hiway A or B is active Restart of a backup PLCG does not cause a change in the hiway state A failure in the PLCG both redundant PLCGs or the emulated hiway A and B out of service changes the hiway status to failed NOTE Hiway state and indication is not related to conditions on the serial communication link between PLCG and the PLCs PLC Gateway Control Functions 2 2 12 97 2 3 2 3 DHP STATUS The state of an emulated DHP is determined by the PLCG but only when the hiway is in the running state If the hiway has failed an access error indication is returned when an operator or LCN module tries to read from or write to an emulated DHP The operational states for process connected boxes are process connected boxes are Run eFail HDW hardware eRun SF soft failure Reset eRun PF partial failure Uncertain Fail COM Hiway Status diagnostic failure A DHP enters the Run state when an o
18. P With a real Hiway this could be a result of communication errors other than those detected by the hiway security check including no response but is not likely to occur in a PLCG In such a situation the PLCG changes the state of the DHP to failed In the absence of such a condition the PLCG sets the state of the DHP to the one that is determined from the box status words 2 3 Reset The emulated DHP itself detected a fatal error and reset itself the functional status is set to basic control and read or write access from an AM or CG is inhibited One of the DHPs can also be commanded reset by using the START Box Command function 2 3 8 Uncertain The emulated DHP has not yet been qualified by the hiway security check and communication with it is inhibited The functional status of the DHP is set to out of service for control 2 3 9 DHP Control States The control states are Basic Read Full and Test If you need more information refer to subsection 3 3 8 in System Control Functions The emulated DHP s states can change from one state to any other however changes from Fail COM HDW and Uncertain force the functional status to Basic Control Because there are no physical DHPs this will not normally occur PLC Gateway Control Functions 2 4 12 97 2 4 2 4 PLCG BACKUP 2 4 1 PLCG Failover Scenario Switching from an active PLCG to the backup is accomplished with as little disruption to control and data acquis
19. TATE2 ZZTEXT or the complement of ZZTEXT If DIGALFMT contains Either and Both boxes for the point on the Group or Detail Display are lit the state shown on the Alarm Summary Display is that of the first box lit You configure the types of alarms for these points in parameter DIGALFMT Details of the alarm options alarm conditions and the effect on the Group and Detail displays for these points are provided under the listing for DIGALFMT in the PLC Gateway Parameter Reference Dictionary The alarm formats that can be configured for each type of digital point are listed on the configuration forms and appear on the Data Entity Builder s parameter entry displays PEDs The formats for PLCG DHP digital points are State1 State I alarm Statel State 2 alarm Chngofst Change of state alarm Cmmdis Command disagree alarm The following parameters are also related to digital alarms e INPDIR Input direction e OUTIND Output indication e ZZTEXT State 00 text neither box lit e NCMPTXTI and NCMPTXT2 Noncomplementary inputs text 3 2 4 1 Summary of Digital States and Alarms The following chart shows which digital alarm types apply to single input and dual input points The command disagree alarm applies only to digital I O points Applicable Alarm Type Single Input Dual Input Noalm no alarm Yes Yes State1 Yes State2 Yes Chngofst change of state Yes Yes Cmmdis command disagree Yes Yes Only with a c
20. acked register will be discarded Note 5 continued on next page PLC Gateway Control Functions 2 10 12 97 2 6 4 Note 5 Continued When the BLOCK MOVE function is used in Modicon controllers the first lowest addressed discrete location will end up in the register MSB bit 15 and highest discreet address in the register LSB bit 0 Other Modbus devices may not pack in reverse order In any case the PLCG unpacks bits in the order shown above Listed below are other notable points and features for Modbus devices Protocol is Modicon model type 584 384 and 484 are also supported Port is 1 to 4 for DHP and 1 to 2 for PLCG LCN parameter PCxPORT Maximum number of registers requested per transaction DHP 32 register values analog or counter 64 bytes or 64 coils digitals 4 bytes PLCG 64 register values analog or counter or 64 16 1024 coils digitals Error Detection and Retry features on communication link Retry information is based on current documentation but is subject to change Error description Message Retried CRC 16 error Yes Message timeout Yes timeout is 1 5 sec for E PLCG 3 0 sec for DHP Wrong PLC device replied Yes for output only Reply message length incorrect Yes for output only Reply length inconsistent with byte count Yes for output only Modbus Exception Codes OI Illegal Function No 02 Illegal Data Address No 03 Illegal Data Value No 04 Failure in PLC slave device No
21. an be in manual MAN or cascade CAS modes only If you need more information about modes see subsection 4 4 1 in System Control Functions 3 1 8 1 Analog Output Point Parameter Descriptions Refer to the PLCG Parameter Reference Dictionary for the full names value ranges default values value types and access levels for these parameters 3 1 9 Point Alarming for Analog Input Points Alarm checking and reporting for analog inputs is as described under subsection 4 3 in System Control Functions 3 1 10 Alarm Limits PVLOTP PVHITP DEVLOTP DEVHITP These are two types of alarms for analog points PV and deviation alarms PV alarms are set in engineering units and are calculated from the actual value of the process variable For example if the temperature of a vessel went above 600 F an alarm could be set Deviation alarms result when the process variable deviates from the setpoint by more than the deviation alarm limit Deviation alarms are set as a percentage of full range that the PV can deviate For example assume that the range is 0 to 1 000 F that the deviation alarm limits are set to 10 and 5 and that the setpoint equals 500 F A deviation alarm occurs when the temperature exceeds the setpoint by 10 of range 100 F or falls below setpoint by 5 of range 50 F therefore with the setpoint at 500 F deviation high alarm occurs at 600 F and the deviation low alarm occurs at 450 F If the setpoint is incre
22. ased to 600 F the new alarm points are 700 F and 550 F The number of degrees that the PV could deviate from setpoint did not change The reference for the alarm calculation did change PLC Gateway Control Functions 3 7 12 97 3 1 11 3 1 11 Event Initiated Processing for Analog Input Points Event initiated processing is enabled when parameter EVENTPRC contains Enable Parameter EIPEVENT defines the types of events that initiate EIP EIP is described in detail under subsection 4 2 in System Control Functions 3 1 11 1 Analog Composite Point Parameter Descriptions Refer to the PLCG Parameter Reference Dictionary for the full names value ranges default values value types and access levels for these parameters 3 1 12 Analog I O Point Addressing User written programs and standard data acquisition and control functions access the analog point parameters in the PLCG in the same way that parameters anywhere else in the system are accessed by specifying the data point name and the parameter for example TELOA PV 3 2 PLCG DIGITAL I O DATA POINTS A digital input data point provides a PV that represents the state of a single discrete value in a PLC A digital output data point provides a digital state to a location ina PLC A composite digital I O point provides one or two inputs and one or two outputs in the same data point 3 2 1 Digital Input Points 3 2 1 1 Digital Input Point Residences Digital input data points are PLCG points
23. d Reserved Entities PLC Gateway Control Functions 2 9 DATA POINT 16 8 6 4 8 PNTBOXOT PNTBOXTY PNTPCTY PRIMOD PTDESC PTDISCL PVALDB PVCLAMP PVDSPHI PVDSPLO PVEUHI PVEULO PVFORMAT PVHITP PVLOTP PVRNGOP PVSTS PVTV RCASENB RNGCODEn SLOTNUM SPECIFI1 SPECIFO1 SPECIFOR STATE STATE1 STATE2 UBOXCLR UNIT ZZTEXT AB or PCnALIVE PCnALVBT PCnPORT PCnPORTA PCnTYPE BOXPROT MODBUS PCnALIVE PCnALVBT PCnALVSP PCnPORT PCnPORTA PCnTYPE 12 97 2 6 4 2 6 4 Quick Reference to Modbus Protocol This subsection provides a key to Modbus protocol that may be needed for your application Modbus RTU Address Map for PLCG PLCG Modbus Memory Modbus Function amp Code Data format Data Range Point type Read from PLC 3 4 Write to PLC Force Single Coil 05 1 ON 00001 09999 Read Coil Status 01 Digital Input r bit coil 10001 19999 Read Input Status 02 no write allowed Analog Input 30001 39999 Read Input Registers 04 Least 12 or or bits of 40001 49999 Read Holding Registers 03 unsigned no write allowed 16 bit register Analog Output 40001 49999 Read Holding Registers 03 Least 12 Preset Single Register 06 bits of unsigned 16 bit register Counter 40001 49999 Read Holding Registers 03 16 bit 0 65 535 Preset Single Register 06 unsigned integer 1 Modbus memory address is split into 2 parameters for DHP point configuration on LCN Most significant digit 10K position is entere
24. d as parameter SPECIFxy lower 4 digits are parameter PCADDRxy x I or O y 1 or 2 2 This is not the Modbus slave address of the PLC device which is determined by PLC configuration or switch setting and entered in parameter PCxPORTA on LCN box slot config entity HYnnBaa range 1 247 3 Data range for analogs is set via parameter RNGCODEX and the PLC must match this data range to transmit or receive values on the communication link Value is processed as percent of range for conversion to Engineering Units Range is not configurable for other point types 4 Counter value can be scaled by the AVCONV parameter Typically set AVCONV 1 5 Packed Digital Inputs DI points may read data from registers packed with discreet status Use PCADDRIX 4xxxx SPECIFIx 4 PCADDRIx 0001 9999 This uses Modbus function 03 Read Holding Register with the same behavior as Analog Input or Counter except the bits are unpacked by PLCG and used in bit order for subslot order That is PLC register bit 0 LSB gt DI subslot 01 PLC register bit 1 gt DI subslot 02 PLC register bit 15 MSB gt DI subslot 16 Only 1 packed register can be used in a DI slot but not all subslots in same slot must use packed format For example you can configure subslots 1 5 to use 5 lowest bits of packed register 40010 then use subslots 6 16 each with a unique Oxxxx or 1xxxx address value Unused bits of the p
25. e while the source is Auto No alarm checks are made on the Man value however alarm checking on the PV continues e Sub The PV value is entered by a user written program The program entered value is checked against the configured range limits and if the PV exceeds one of those limits the value is clamped at the limit Either an operator or a user written program can change the PV source to Sub The Sub value can t be changed while the PV source is Auto No alarm checks are made on the Sub value PLC Gateway Control Functions 3 4 12 97 3 1 7 There are no interlocks to prevent switching from Auto to Man or Sub PV sources at any time When the PV source is switched from Auto to Man the initial Man value is made equal to the Auto value so there is no initial bump in the value Likewise when the PV source is switched from Auto to Sub the initial Sub value is made equal to Auto A bump in the PV can occur when switching from Man or from Sub to Auto The current PV source for each data point is available in data point parameter PVSOURCE for displays or printing NOTE For more information on the parameters mentioned in the following paragraphs including value types value ranges default values and access levels refer to the PLCG Parameter Reference Dictionary 3 1 7 PV Range PV Clamping Options and PV Value Status The following parameters specify PV processing options e PVCLAMP PV Clamping Option Values are NoClamp and C
26. ed as described under subsection 3 2 2 4 3 2 3 4 Initialization Initialization is as described under subsection 3 2 1 5 and subsection 3 2 2 5 3 2 3 5 Digital I O Composite Parameter Descriptions Refer to the PLC Gateway Parameter Reference Dictionary for the full names value ranges default values value types and access levels for each parameter PLC Gateway Control Functions 3 16 12 97 3 2 4 3 2 4 DIGITAL ALARMS The types of digital alarms are e Change of state alarms The alarm is detected when the state of a digital input point changes in either direction This alarm is cleared from the Alarm Summary Display when the alarm is acknowledged e State alarms The alarm is generated when the input point is in the state contained in the DIGALFMT parameter The states for this alarm are State 1 State 2 Input 1 Input 2 Either and Both This alarm remains on the Alarm Summary Display until the point is no longer in the alarm state e Command disagree alarms These alarms apply to only digital composite points The alarm is generated when the point has been commanded output to go to a state and after a user defined time the input state does not agree with the commanded state For state change of state and command disagree alarms the alarm descriptor that appears on the Alarm Summary Display is the actual state of the digital PV which can be the string value self defined enumeration in any of these parameters STATE S
27. ell to non zero values the PLCG writes a I to that PLC location every 10 seconds through its emulated DHP By doing this the PLCG notifies the PLC that it is alive If the PLCG fails it does not write the Keep Alive address a timer in the PLC expires and the PLC knows that the PLCG is down The PLC can then take action such as suspending batch operation or sounding an external alarm The action the PLC takes is programmed in the relay ladder logic The 10 second Keep Alive interval is fixed in the emulated DHP and cannot be changed If the PCxALIVE PCxALVBT and PCxALVSP parameters are set to zero 0 or left at default NaN value the Keep Alive write is disabled for that DHP See subsection 3 3 2 2 in Programmable Logic Controller Gateway Implementation Guidelines for Keep Alive addressing 2 8 3 Software Upgrades Redundant PLCGs migrating to new LCN software must already have Firmware Revision G or higher installed PLC Gateway Control Functions 2 15 12 97 PLC Gateway Control Functions 2 16 12 97 DETAILED DATA POINT DESCRIPTIONS Section 3 This section provides a definition of the functions of the seven types of PLCG data points digital input points digital output points digital composite points analog input points analog output points and analog composite points 3 1 PLCG ANALOG I O DATA POINTS Analog I O data points represent analog inputs from the PLC and analog outputs to the PLC A composite analog I O
28. er performance because data is transferred through the PLCG more quickly than over a Data Hiway and through DHPs 2 1 PLCG SCOPE The PLCG was designed primarily for data acquisition and supervisory level control In supervisory control schemes the PLCG supports limited writes of set point type data while the PLC performs high speed control sequencing A typical PLCG PLC control application can be depicted with a ten motor conveyor belt For proper operation the startup shutdown sequence of the individual motors must be precisely controlled To start or stop the belt an operator performs a single write from the PLCG to the PLC The PLC would then be responsible for performing the detailed operation that results in the desired change PLC Gateway Control Functions 2 1 12 97 2 2 NOTE Because the PLCG emulates an HG with a Data Hiway and up to eight DHPs all references to Data Hiways and DHPs boxes refer to the emulated devices and to emulated slots and subslots and not to physical devices The term slot applies to the point memory space in the PLCG and the term subslot applies to the data points that are implemented in these slots BACKUP DATA HIWAY BOXES AND DATA HIWAY ARE EMULATED RELAY PANEL PORTS 1 amp 2 3360 2 2 HIWAY STATES The operating states of the emulated hiway and DHPs are presented on the Network Status display for each PLCG While there is no Data Hiway connected to the P
29. format Honeywell PLCs also use Modbus addressing formats For example address 30001 is expressed as address 0001 with a specifier of 3 The valid specifiers for DHP analog points are 3 and 4 A specifier of 4 indicates that the DHP can read from and write to the specified memory location A specifier of three indicates a read only address therefore analog inputs can use a specifier of either 3 or 4 since both specifiers allow reading of the data An analog output must always have a specifier of 4 PLC Gateway Control Functions 3 2 12 97 3 1 4 3 1 4 First Level Processing of Analog I O Points 3 1 4 1 PLC Range Codes The PLC Range Code tells the emulated DHP how an analog input or output value is stored in the PLC device The emulated DHP then uses this information to convert the value to the format that the TDC System uses which is called B12E The table below shows where each Range Code is used Table 3 1 Range Code and Where Used o Gi 0 999 PLC PLC2 family 1 0 4095 Used with Modicon PLCs devices that emulate Modicon and Honeywell 620 Logic Controller System 2 0 9999 Used with Allen Bradley PLCs or any other PLC that stores its values as numbers in this range PLC 3 5 families 0 9999 Default to Range Code 2 Note The Range Codes are typically used for the indicated PLCs but any PLC device may use any of the three codes and that range in the PLC must match the RNGCODEX selection in the DHP point B12E i
30. hat associated custom schematic from a point Detail Display or Group Display The ASSOCDSP parameter can be changed from the configuration page of the Detail Display for points that have a configuration page 3 5 2 Auxiliary Units Alarmable PLCG points in Release 520 and later software have an Auxiliary Unit AUXUNIT parameter If this parameter is set to null alarms and messages on that point go to the primary unit If a valid Unit ID is specified alarms and messages from that point go to the Auxiliary Unit AUXUNIT can be configured at build time or with the proper keylevel it can be initially assigned or changed by schematics CL programs the DEB alter parameters function or from the configuration page of the Point Detail display The keylevel necessary to change AUXUNIT is configurable in the System Wide Values section of the Network Configuration File Alarms from a point where AUXUNIT has been configured are accepted only by Universal Stations having an Area Database in which both the Primary Unit and the Auxiliary Unit are configured If an AUXUNIT assignment is changed and there are outstanding alarms on the old unit alarms are deleted from the old unit and added to the new unit PLC Gateway Control Functions 3 22 12 97 Index Topic Section Heading Alarms Analog Points Critical Critical Status Digital Limits Allen Bradley PLCs Analog Input Points Analog I O Data Points PLCG Point Addressing First
31. he number of momentary doorbell digital output points is limited to 200 for the standard 6800 based PLCG or 500 for the enhanced 68020 based PLCG PLC Gateway Control Functions 3 10 12 97 3 2 2 3 2 2 1 Functional Structure m Man o NN Output Conversion Cas o State to Raw State 4 Source Determined Source writes one of by Mode two output states Figure 3 2 Function Diagram Digital Output 3 2 2 2 Digital Output Functional Description 3 2 2 2 1 Digital Output Behavior Digital outputs have one of two types of behavior Momentary doorbell Outputs can be sent from a Universal Station A momentary output stays in the specified position as long as the operator or engineer continues to press the appropriate key For a US a variable length sequence is transmitted depending on how long the output change key UP or DOWN triangle is depressed The sequence is as follows Activate Sequence Output2 Commanded State Output Commanded State Activate Sequence is repeated each second by HG function if output key is kept depressed The Deactivate Sequence is executed when the ouptut change key is released Deactivate Sequence Output2 OFF deactivated Outputl OFF deactivated Therefore the minimum sequence is 4 outputs for a brief depression of the ouptut change key Note Momentary outputs in a 2 output composite point typically result in a PV state of BADPV o
32. ial Functions Related to Processing Analog I O Point Analog Points Order of Counter Event lInitiated Analog Points First Level of Analog I O Points Second Level of Analog I O Points PV Clamping Options Analog Points Range and Clamping Analog Points Range Analog Points Source Selection Source Selection Analog Points Value Status PVEUHI PVEULO Range PV Analog Points Range Codes PLC References Reset Box Status Reverse Acting Transmitter Handling RNGCODEO 1 2 Run State Run PF Run SF os RO DNS SE SES GOOG 07 MuORWNON Oo CAC ne DECO PO CO D RO RO PSG DOs CS a 3 D il co N gt a lt w AN CD BNOSNSNNN GP OR Lo MN OB RO SG ON 00 00 2 DCS NOOO CR CR Ce C26 Go O 0 CO Ua U m OU l OH O0 Au mu DUR NN PLC Gateway Control Functions Index 3 12 97 Index Topic Section Heading Scenario PLCG Failover Secondary Points Contact Cutout Selection PV Source Analog Points Selection PV Source Software Upgrades Source Selection PV Analog Points Special PLCG Functions Start ups DHP States Box DHP Control Hiway Run Status Emulated DHP PV Value Target Value Total PLCG Point Capacity Transmitter Handling Reverse Acting Uncertain Box DHP Status Value Status PV D D D D D PP co NON NR NEN EN O D D 1 Gi DEN 02 GO NC D WN D ND D D amp D 1 xi PLC Gateway Control Functions Index 4 12 97 FAX Transmit
33. int Processing Box Slot Data Point Parameters Box Slot Point Names Special Point Related Functions Associated Display Auxiliary Units amp o NO U1 PR amp D ROD KR D ht feck k D G9 G9 G9 G9 G9 G9 CD D CO CO CD D WO CO CO W W CO CO W WW W WW CD CD CD CD CD CD 8 D OO UP PB PP PR U WU WW DD nn nn ND PLC Gateway Control Functions i 12 97 REFERENCES Section 1 This section provides references to other publications that are useful or necessary in implementing control system functions 1 1 REFERENCES This manual describes the data acquisition and control functions that reside in PLCGs and the logical boxes that are in the PLCGs There are two companion publications e System Control Functions in the Implementation Startup amp Reconfiguration 2 binder describes data acquisition and control functions that are independent of the module or gateway they reside in e Application Module Control Functions in the Implementation Application Module 1 binder describes data acquisition and control functions in Application Modules You should be familiar with the content of System Control Functions before using this publication or other control function publications Other topics related to data acquisition and control functions are covered in these publications e Preparation of Control Language Programs First refer to the Control Language Application Module Overview in the Implementat
34. ion Application Module 2 binder Then refer to the Control Language Application Module Reference Manual in the same binder These manuals cover both continuous control programs that run in AMs and CL MC programs that run in MCs e Parameters For details on all of the data point parameters including value types default values and access levels keys refer to the following publications PLC Gateway Parameter Reference Dictionary in the Implementation PLC Gateway binder Application Module Parameter Reference Dictionary in the Implementation Application Module I binder 1 2 COMMON FUNCTIONS With Release 510 and later software an Associated Display can be configured for each point at build time by entering the name of a custom built schematic in the ASSOCDSP parameter At operating time the operator can call up that associated custom schematic from a point Detail Display or Group Display The ASSOCDSP parameter can be changed from the configuration page of the Detail Display for points that have a configuration page PLC Gateway Control Functions 1 1 12 97 PLC Gateway Control Functions 1 2 12 97 PLCG DATA ACQUISITION AND CONTROL FUNCTIONS Section 2 This section defines the data acquisition and control functions other than data point functions that are accomplished in a Programmable Logic Controller Gateway PLCG The data point functions are defined in Section 3 The Programmable Logic Controller Gateway PLCG is
35. ion is a new member of a set of publications that define control system functions The other members of the set are System Control Functions Process Manager Control Functions and Algorithms Hiway Gateway Control Functions and Application Module Control Functions For the most effective use of this manual you should be familiar with the concepts and terminology introduced in the System Control Functions manual This publication supports TotalPlant Solution TPS system network Release 500 520 TPS is the evolution of TDC 3000X Change bars are used to indicate paragraphs tables or illustrations containing changes that have been to this manual Pages revised only to correct minor typographical errors contain no change bars PLC Gateway Control Functions 12 97 PLC Gateway Control Functions 12 97 Table of Contents 1 REFERENCES 1 1 References 1 2 Common Functions 2 PLCG DATA ACQUISITION AND CONTROL FUNCTIONS PLCG Scope Hiway States DHP Status Run State Run SF Run PF Idle SF Idle PF Fail COM Fail HDW Reset Uncertain DHP Control States PLCG Backup PLCG Failover Scenario PLCG Parameter Configuration and Error Codes Avoiding Errors Errors on Input and Output Requests to PLCs PLCG Parameter Configuration Relating PLCG Boxes and Slots to PLCs and PLC Addresses Reserved Entities Parameter Configuration Quick Reference to Modbus Protocol PLCG Data Point Capacity Total PLCG Point Capacity Composite Points in One B
36. ition as possible These two factors are very important in failover processing e Time out handling e Time to restore communication on the emulated Data Hiway It takes the backup 1 second to detect a failure in the primary PLCG When it does detect a failure it attempts to directly communicate with the primary PLCG If this communication isn t reestablished within 2 seconds the backup requests the error handling subsystem to determine whether to replace the active PLCG While waiting for this swap the backup proceeds with the following two functions 1 Hiway security checking is started by the backup and the scanning of the points with the 50 most critical emergency priority alarms begins 2 The time out gates in the boxes are updated so that control shedding doesn t occur When the system error handler determines that the formerly active PLCG has failed failover processing continues The total time to complete the failover is about five seconds As failover processing continues the following takes place 3 The backup secondary becomes active primary 4 All functions that receive event messages are notified that failover has occurred and the distribution of the highest priority alarms begins 5 Requests for data from the PLCG are processed according to these priorities e Control function requests e Operator initiated requests e Display updates 6 Alarms other than the 50 critical alarms are processed 7 Remaining req
37. lamp Access level is Engineer e PVRNGOP PV Range Option Values are None FullRng and ClmpZero Access level is Engineer e PVSOURCE The source of the PV Values are Auto Man and Sub Access level is Supervisor These parameters indicate the results of PV processing e PV Process Variable Value range is specified in PVRNGOP e PVSTS PV Value Status Values are Normal Uncertn and Bad e PVEXHIFL PV Extended High Range Flag Values are True and False e PVEXLOFL PV Extended Low Range Flag Values are True and False The functions of these parameters are as follows e PVCLAMP If PVCLAMP NoClamp and the PV is outside the range indicated by PVRNGOP PVSTS Bad If PVCLAMP Clamp and the PV is outside the range indicated by PVRNGOP PVSTS Uncertn The value in PVCLAMP affects the status indicated by PVSTS PLC Gateway Control Functions 3 5 12 97 3 1 7 e PVRNGOP If PVRNGOP None the extended range of the PV value is from 6 9 to 106 9 If PVRNGOP FullRng the extended range of the PV value is from 2 9 to 102 9 If PVRNGOP ClmpZero the extended range of the PV value is from 0 to 102 9 e PVSOURCE If PVSOURCE Auto the PV is obtained from its configured source as indicated by PVSLTSRC and PVSIGNAL If PVSOURCE Man the PV value is entered by a Universal Station operator If PVSOURCE Sub the PV value is entered by a user written program e PVEXHIFL TIf the PV is above the high end
38. n range 0 65535 The PLC inputs are typically accumulated values from instruments like pulse type flow meters speedometers or event counters but can be any integer stored by the PLC in the defined location PLCG counter data points use counter slots in emulated DHPs Each DHP slot can have eight counters The PLC register address must be configured in DHP Counter point parameter PCADDRI1 A PLCG counter point can be used to write a value to a PLC location The PLC can overwrite this location if it is truly a counter and it can treat the location as a supervisory control input PLC Gateway Control Functions 3 19 12 97 3 3 1 Functional Structure PLCG Counter Point The structure of a PLCG counter is shown on Figure 3 4 Or Ladder Program Store 11 1 1 1 1 010 AV Integer Accumulated Value X AVCONV In PLCG 919919 9 19 PLC x AVCONV AV PRESET m Accumulated Value B lt jem O gt lt Decimal Position for AV Value Figure 3 4 Functional Diagram PLCG Counter PLC Gateway Control Functions 3 20 3 3 1 12 97 3 3 2 3 3 2 Counter Functions The PLCG scan puts the content of a PLC register into the Accumulated Value AV and Output OP parameters after scaling by the Accumulated Value Conversion factor AVCONV parameter Setpoint SP and PRESET parameters can be changed by an operator but are forced to the same value An operator ma
39. nges state 3 2 1 4 6 Digital Input Point Functions These are digital input functions for PLCGs Input Acquisition PV Conversion PV Source Selection Alarming Off Normal Change of State EIP Note Inputs are by a free running scanner 3 2 1 5 Initialization of Digital Inputs Digital input data points are initialized when the emulated DHPs are restarted The emulated DHPs don t initialize in the sense that some hiway based boxes do DHPs initialize to the state of the inputs first acquired when the emulated DHP goes from the reset state to the processing state When an emulated DHP is reset the PV is not available to the PLCG 3 2 1 6 Digital Input Point Parameter Descriptions Refer to the PLC Gateway Parameter Reference Dictionary for the full names value ranges default values value types and access levels for these parameters 3 2 2 PLCG Digital Output Data Points A digital output data point writes a single digital state to a location ina PLC A dual digital output point writes a single digital state to two locations in a PLC For the emulated DHP the number of digital output data points is limited by the number of I O slots that are configured for digital outputs There can be up to 8 for each slot and a maximum of 30 slots for a DHP There may be some limitation in number of digital output points that the PLCG can handle because of the number and mix of boxes on the hiway and the types of points in the boxes T
40. no input signal conditioning boards but the programmable controller it interfaces may have them DHP Scanning Rate The PLCG scans its digital inputs with a free running scanner that scans as fast as its processor and communication network can 3 2 1 4 2 Conversion of Raw Contact Inputs to the PV The PV for a digital input point has two states such as on off or open closed You configure a descriptor for each of the two PV states in the STATE and STATE2 parameters if you need more information refer to subsection 3 2 4 and when you do you relate those states to the states of the raw input wired from the PLC These descriptors represent the state of each digital input when they appear on US displays 3 2 1 4 3 PV Source Selection for Notified Status Inputs Parameter PVSOURCE indicates the source of the digital input PV When PVSOURCE contains Auto the PV is an input from the PLC When it contains Man the source is an operator at a US When it contains Sub a user written program or a continuous control data point provides the PV see subsection 3 1 7 PLC Gateway Control Functions 3 9 12 97 3 2 1 3 2 1 4 4 Digital Input Alarms Digital point alarms are defined under subsection 3 4 3 2 1 4 5 Event initiated Processing You can configure digital input points for event initiated processing EIP See subsection 4 2 in System Control Functions EIP occurs for each alarm and each return to normal It also occurs when the PV cha
41. notified status inputs are accepted by digital I O composite data points 3 2 3 2 3 Conversion of Input s to PV s The PV s represent the current state s of the input signal A single input can generate two PVs Dual inputs can generate four PV states The PV for a digital input point has two states like on off or open closed You configure a descriptor for each of the two PV states in the STATE1 and STATE2 parameters see subsection 3 2 4 and when you do you relate those states to the states of the raw digital acquired from the PLC These descriptors represent the state of each digital input when they appear on US displays If dual inputs are used the descriptors for the remaining two states default to Bad and InBetwen PLC Gateway Control Functions 3 14 12 97 3 2 3 3 2 3 2 4 PV Source Selection for Digital Composite I O Points Parameter PVSOURCE indicates the source of the digital input PV When PVSOURCE contains Auto the PV is derived from the PLC When it contains Man the source is an operator at a US When it contains Sub a user written program or a continuous control data point provides the PV see subsection 3 1 7 3 2 3 2 5 Alarming Digital point alarms are defined under subsection 3 2 4 3 2 3 2 6 Event Initiated Processing for Digital O Composite Points You can configure digital I O composite points for event initiated processing EIP occurs when an alarm is detected or on a return to normal See subsection 4 2 in Sy
42. ntity Builder DEB be sure to first set to zero 0 the PCADDRxy and SPECIFxy Modbus or PCBITxy Allen Bradley digital parameters for the DHP point The DELETE ENTITY function does NOT delete point data from the emulated DHP box memory and the point will continue to be read from the PLC as long as the PCADDRxy and SPECIFxy or PCBITxy parameters are non zero This is commonly referred to as a ghost point To avoid these kinds of errors it is a good idea to enter all PLC points and their corresponding TotalPlant Solution TPS system tagnames into a database program on a personal computer The data can then be sorted in any way you need and you ll be able to track which PLC points correspond to which tagnames Remember to update the database anytime you make changes to the PLCG configuration 2 5 2 Errors on Input and Output Requests to PLCs The PLCG attempts to read all configured PLC data with every scan but an error detected during a normal scan request is not shown on the Operator Personality s Network Status Display until retries also fail The failed request will be retried two more times If the error was only transient the points and slots associated with that request will not indicate failure If the error persists the slots will fail and thereafter the PLC device is checked once each scan to allow error recovery When you attempt to change the state value of a PLC point you make an output request Output requests
43. omposite output point PLC Gateway Control Functions 3 17 12 97 3 2 4 For single digital inputs ph State Presentation At State Description on Alarm Summary Display Input State State Text Boxes LCN State Alarm Command Disagree PV Parameter Lit Ordinal State 1 State 2 State 1 State 2 0 1 STATE1 Lower 0 STATE1 n a n a STATE1 1 0 STATE2 Upper 1 n a STATE2 STATE2 n a Lo Reverse Indication Direct Indication For dual digital inputs State Presentation State Description on Alarm Summary Display Input State State Text Boxes LCN State Alarm Commd Disagree PV Parameter Lit Ordinal Input 1 Input 2 Either Both State1 State 2 00 11 ZZTEXT None 0 n a n a n a n a ZZTEXT ZZTEXT 01 10 STATE Lower 1 n a ST1 ST1 n a n a STATE1 10 01 STATE2 Upper 2 ST2 n a ST2 n a 11 00 CZZT Both 3 ST2 ST1 STx CZZT CZZT CZZT Reverse Indication Direct Indication For single digital outputs Presentation State i 7 Output State State Text Boxes LCN What Activates Output OP Parameter Lit Ordinal with Group or Detail Display 0 1 STATE1 Lower 0 Down Arrow 1 0 STATE2 Upper 1 Up Arrow LL Reverse Indication Direct Indication For dual digital outputs State Presentation Output State State Text Boxes LCN What Activates Output OP Parameter Lit Ordinal with Group or Detail Display 00 11 NONE None 0 Not Possible 01 10 STATE1 Lower 1 Down Arrow 10 01 STATE2 Upper 2 Up Arrow 11 00 BOTH Both 3 Not Possible
44. ox Fifty Points with Critical Alarm Status Momentary Doorbell Digital Points Analog Input Points Points with Event Initiated Processing Contact Cutout Secondary Points Special PLCG Functions Functions Related to Emulated DHPs Special Functions Related to Process Connected Subsystems Software Upgrades RONM _ J O O1 BB ND D D D D D D D D D D D D D D D D D D D D D D D D D NN NN NN NN NO O1 B D 0 NNNNNNNND D D UUD Co Co Lo w w w Co Co w w a D Ohm PLC Gateway Control Functions i 12 97 Table of Contents 3 DETAILED DATA POINT DESCRIPTIONS PLCG Analog I O Data Points Analog I O Point Types Functional Structure of Analog I O Points Processing Order for Analog I O Points First Level Processing of Analog I O Points Second Level of Analog I O Processing PV Source Selection for Analog I O Points PV Range PV Clamping Options and PV Value Status Analog Output Data Point Modes Point Alarming for Analog Input Points Alarm Limits PVLOTP PVHITP DEVLOTP DEVHITP Event Initiated Processing for Analog Input Points Analog I O Point Addressing PLCG Digital I O Data Points Digital Input Points PLCG Digital Output Data Points PLCG Digital I O Composite Data Points Digital Alarms PLCG Counter Data Points Functional Structure PLCG Counter Point Counter Functions PLCG Counter Parameters PLCG Counter Processing PLCG Hiway and Box Slot Data Points Hiway Point Parameters Box Slot Data Po
45. perator at a Universal Station uses the Network Status display and box commands to tell it to do so 2 3 1 Run State The emulated DHP is fully operational the hiway security check has qualified the box Run state is indicated by OK status on the Hiway status display This state can be selected by the operator from the Reset state by using the ENABLE processing box command if the box is operational and qualified 2 3 2 Run SF The emulated DHP is in Run and a soft failure has been detected 2 3 3 Run PF A partial failure has been detected in the emulated DHP Some points are affected their state is failed unaffected slots operate normally 2 3 4 Idle SF Idle PF The emulated DHP is in the idle state and a soft failure SF or a partial failure PF has been detected 2 3 5 Fail COM The emulated DHP failed the hiway security check or an addressing error was detected All communication to the DHP except for hiway security tests are inhibited The functional status is set to Basic Control Because there are no physical DHPs this will not normally occur PLC Gateway Control Functions 2 3 12 97 2 3 6 2 3 6 Fail HDW The PLCG has determined that the emulated DHP has failed the functional state is set to Basic Control read and write access from AMs and CGs is inhibited This state can be set by only the PLCG Box HDW Failure Definition A box failure is the inability of the PLCG to communicate with a specific DH
46. point provides one input and one output in the same data point 3 1 1 Analog I O Point Types There are three types of analog I O data points e Analog Input one input from a PLC e Analog Output one output to a PLC e Analog I O Composite one input and one output with the same tag name The input slot and subslot and the output slot and subslot must be in the same emulated DHP 3 1 2 Functional Structure of Analog I O Points e Analog input points have one input from a PLC and produce a PV with point status and PV status e Analog output points have one output OP with related status and mode parameters e Analog I O composite points combine one analog input and one analog output in one data point with one tag name They are intended to support displays and applications that use an output with position feedback They have an output value with its status and an input PV with its status PLCG users should bear in mind that inputs to and outputs from the PLCG can be affected by the ladder logic in the PLCs When interpreting the process information on Universal Station displays operators supervisors and engineers must be aware of the effect of ladder logic on the process inputs and outputs For example an operator could command a state change for a digital output but the ladder logic might prevent that state change from reaching the process equipment For this reason normal operation of the PLCG is to scan all output values
47. r 16 subslots depending on the point type as indicated on the chart above Composite points consume more than one PLCG memory location therefore the total point capacity is the lesser of 3 000 points or 240 slots of data 2 7 2 Composite Points in One Box Composite Analog I O and Composite Digital I O points must be configured for the same PLCG and the same DHP box The input and the output cannot be in different boxes For more information see subsections 3 1 and 3 2 2 7 3 Fifty Points with Critical Alarm Status Up to 50 data points can be configured for critical alarms ALPRIOR for such points is configured as Emergncy These points are specially checked on PLCG startup or failover to see if an alarm has been detected during the failover operation During failover alarms that have a lower status than critical are not distributed In normal operation points with ALPRIOR Emergncy are scanned by the PLCG at 1 2 second intervals for alarm condition These points are updated from PLC memory at the same rate as all other PLCG points 2 7 4 Momentary Doorbell Digital Points For standard PLCGs with a 68000 processor up to 200 momentary or doorbell digital output points can be configured Enhanced 68020 PLCGs can have up to 500 momentary digital output points PLC Gateway Control Functions 2 12 12 97 2 7 5 2 7 5 Analog Input Points For standard PLCGs up to 1 440 analog input points can be configured Enhanced 68020 PL
48. r INBETWN which is undesirable PLC Gateway Control Functions 3 11 12 97 3 2 2 Latched The output remains in the requested position until a new request is issued That is output from the data point is held in the commanded state energized or deenergized until another command is issued For an HG a fixed sequence of four outputs is transmitted one time Output2 OFF deactivated Outputi OFF deactivated Output2 Commanded State Output Commanded State 3 2 2 2 2 Digital Output Modes and Red Tagging The source of the output request is determined by the mode which can be e CAS Output state specified by another data point or by a user written program e MANual Output state specified through a Universal Station When an output is defined as red tagged the output does not change despite output requests from a Universal Station or from a user written program 3 2 2 2 3 Output State Conversion to Raw Contact Output The two states of each output are defined by two state descriptors that relate to the two possible states of the stored digital in the PLC These states could be Open Closed or Running Stopped for example When you configure a digital output point you provide the descriptors in the STATE and STATE2 parameters and assign the contact state for each of them 3 2 2 2 4 Digital Output Point Functions PLCG digital output data points can have the following functions latched or momentary outputs modes and attributes
49. rs are updated when necessary by the PLCG and the boxes Hiway data points and box data points must be configured for PLCGs Even though the emulated DHPs in a PLCG are not physical boxes on a physical Data Hiway hiway and box data points must still be configured for them Performance and communication information is maintained by the PLCG s emulated DHPs These statistics may be obtained by using SMCC For more information refer to PLC Gateway Planning Installation and Service PLC Gateway Control Functions 3 21 12 97 3 4 3 3 4 3 Box Slot Data Point Parameters For information on the functions value types ranges and access levels of these parameters refer to the PLC Gateway Parameter Reference Dictionary and to the PLC Gateway Configuration Form Instructions 3 4 4 Box Slot Point Names Box Points have reserved entity names which are automatically established by the Data Entity Builder as you build the points Users and user programs can refer to box point parameters through the reserved entity names For example SHY02B05 BOXSTAT The box status parameter Box number 05 Data Hiway 02 Identifies this as a reserved entity 3 5 SPECIAL POINT RELATED FUNCTIONS 3 5 1 Associated Display With Release 510 and later software an Associated Display can be configured for each HG point at build time by entering the name of a custom built schematic in the ASSOCDSP parameter At operating time the operator can call up t
50. s a format that the TDC System uses to store its analog values The acronym B12E means the following B Binary Number 12 12 integer bits which implies three fractional bits and one sign bit E Excess 247 which means that 0 of engineering unit range is 247A D counts instead of zero The data read by the PLC gets into the emulated DHP in the following way The PLC device reads an input from some process connected device such as a transmitter It then stores the value in either raw A D counts or in BCD as in the case of Allen Bradley PLC 2s The emulated DHP then converts the data from the PLC s data storage format to the B12E format and it is used by the TDC 3000 System Once the value is stored as a B12E number it can be converted to engineering units No matter what the data format or the engineering units used the value can always be expressed in percentage of engineering unit range as shown in the following chart Raw A D Counts in B12E In BCD in PLC PLC TDC of EU RNGCODE 0 RNGCODE 1 RNGCODE 2 System Range 1000 999 BCD 4095 Counts 9999 Counts 4095 1000 100 500 BCD 2046 Counts 5000 Counts 3847 0 BCD OCounts 0 Counts 247 0 0 PLC Gateway Control Functions 3 3 12 97 3 1 4 3 1 4 2 Alarm Limits and Processing For further information on this subject see subsection 3 1 8 in this manual 3 1 5 Second Level of Analog I O Processing 3 1 5 1 PV Range Low PVEULO and PV Range
51. stem Control Functions 3 2 3 2 7 Modes Attributes Red Tagging The source of an output request is indicated by the value in the MODE parameter which can be e CAS Output state specified by another data point or by a user written program e MANual Output state specified through a Universal Station When an output is defined as red tagged the output does not change despite output requests from a Universal Station or from a user written program The attributes determine if an operator Oper or a user written program Prog can change the mode and the PV when in Manual mode 3 2 3 2 8 Output State Conversion to Raw Contact Output The output to the PLC can have two states These correspond to the two possible states of the memory location of the PLC one zero or true false You configure a descriptor for each of the two states in parameters STATE and STATE2 The descriptors relate the state of the output to the state at the output terminals raw outputs PLC Gateway Control Functions 3 15 12 97 3 2 3 3 2 3 2 9 Digital O Composite Point Functions in DHPs The following are digital composite point functions in PLCGs Input Acquisition PV Conversion PV Source Selection Alarms see subsection 3 2 4 EIP Output Behavior Latched Pulsed Modes Attributes Red Tagging Output State Conversion Note Inputs are scanned by a free running scanner 3 2 3 3 Processing of Digital I O Composite Points Outputs are process
52. tal FAX No 602 313 4842 TO G Cacciatore Total FAX pages including this page Reader Comments Title of Document Programmable Logic Controller Gateway Control Functions Document Number PLO9 500 Issue Date 12 97 Commenis FROM Name Date Title Company Address City State ZIP Telephone FAX You may also call 800 822 7673 available in the 48 contiguous states except Arizona in Arizona dial 602 313 5558 or write to Honeywell Inc Industrial Automation and Control Automation College 2820 West Kelton Lane Phoenix AZ 85023 3028 Honeywell Industrial Automation and Control Helping You Control Your World Automation College 2820 W Kelton Lane Phoenix AZ 85023 3028
53. the variable goes above that value A zero clamp option is also available where the PV is clamped at 0 of the range if the variable goes below that value 2 8 1 6 Reverse Acting Transmitter Handling The PLCG accommodates reverse acting data from the PLC see parameter OUTIND in the PLC Gateway Parameter Reference Dictionary 2 8 1 7 PV Value Status Value status is assigned to all analog PVs by the PLCG A bad value status is assigned if the PV is outside the range and the extension and clamping is not configured or if the PV is not available from the emulated DHP The value status is uncertain when the PV is clamped or the PV source is other than auto When the PV status is bad the PV value is NaN not a number 2 8 2 Special Functions Related to Process Connected Subsystems 2 8 2 1 Modicon Controllers and Modicon Emulators The PLCG can scan discrete status digital inputs that are packed in a register Modicon controllers support this operation and possibly some emulator types For this feature 16 digitals may be packed into one 16 bit holding PLC register The slot must be a digital input type slot but the address should be of the form 4xxxx where 4 is the specifier and Xxxx is the register address Only one packed register can be used in a Digital Input slot but not all subslots in that slot must use packed format For example subslots 1 5 may be use the lowest 5 bits of packed register 40010 then subslots 6 16 used
54. their secondary points In addition each slot can be assigned parameter TOGINTSL to one of two time intervals configured for its box BOXTOGn These intervals are the time out periods for the slot A write to the SP or OP parameter of a point in a slot resets the timer 2 8 1 3 General Parameter Access The PLCG provides access to all accessible parameters in the emulated DHPs The PLCG returns an error indication if an invalid access request is made PLC Gateway Control Functions 2 13 12 97 2 8 1 2 8 1 4 PV Source Selection The PLCG provides selection of PV sources for all analog input and digital input data points While the PV source is manual or substituted mode changes are inhibited Access to the PV Auto value is available when the PV source is manual or substituted Values of PV MAN and PV SUB are limited to the PV range While the PV source is manual or substituted PV alarms are inhibited A bump in the PV can occur when changing from SUB to AUTO When PVSOURCE equals MAN or SUB the manually entered or substituted PV value is held in the PLCG while the PV in the emulated DHP visible at the LCN as PVAUTO is unaffected Alarm checking continues on the PV in the box 2 8 1 5 Clamping If PV clamping is configured for a data point PVCLAMP Clmp clamping is handled by the PLCG For the full range clamp option the PV is clamped at 2 9 of the range when the variable goes below that value and it is clamped at 102 9 if
55. uests for data from the PLCG are processed 8 All remaining functions resume including checkpointing of PLCG data history collection and trending PLC Gateway Control Functions 2 5 12 97 2 5 2 5 PLCG PARAMETER CONFIGURATION AND ERROR CODES After you have used the Data Entity Builder to build and load PLCG points you may encounter error codes for one or more emulated DHPs on the Operator Personality s Network Status display for the PLCG s hiway These errors are likely to be caused by configuration errors such as incorrect PLC addresses 2 5 1 Avoiding Errors If you incorrectly define a PLCG data point the PLC may report an error in its response resulting in PCCONFxy BAD for the DHP point and failure of the slot to which it is loaded The DHP may also report a status change error which can be decoded with information from the PLCG Planning Installation and Service manual These errors are sometimes difficult to isolate so use caution when changing DHP points or loading for the first time This occurs because the point number is referencing a PLC point address which is not configured These errors are sometimes difficult to isolate however once you have identified the troubled slot you can disable the emulated DHP This allows the Detail Displays access to the PLC database and you can then search through the tagnames associated with the error NOTE When deleting a DHP point with the DELETE ENTITY function of the Data E
56. with unique Oxxxx or 1xxxx addresses Refer to PLC Gateway Forms if you need more information The PLCG may be configured to suppress the periodic scanning of analog or digital outputs from Modicon controllers During configuration create a logical Modbus PLC using Port No 3 or 4 on the actual Port 1 or 2 respectively Then configure any nonscanned points against this logical PLC If anyone attempts to configure an input point analog digital or counter against a nonscanning logical PLC a configuration error will occur PLC Gateway Control Functions 2 14 12 97 2 8 2 2 8 2 2 Allen Bradley Conirollers The PLCG may be configured to accept only binary data registers or counters from A B PLC 3 or PLC 5 controllers by selecting type APLC during configuration Any other selection means the data will be accepted only in BCD form Refer to PLC Gateway Forms if you need more information The PLC may be configured to accept data sent by A B PLCs via unsolicited messages During configuration use Port No 3 or 4 to mean Port 1 or Port 2 with unsolicited messages Standard A B Data Hiway rules apply Configuration applies to each PLC definition PC1 PC2 etc for each emulated DHP Definitions may mix access types from the same physical PLC Refer to PLC Gateway Forms if you need more information 2 8 2 3 Keep Alive Addressing By configuring the HYnnBaa parameters PCxALIVE and PCxALVBT Allen Bradley or PCxALVSP Modbus or Honeyw
57. y change the PLC register using the OP target but a program must write to the AV parameter 3 3 3 PLCG Counter Parameters For information on the functions value types ranges and access levels of these parameters refer to the PLC Gateway Parameter Reference Dictionary and to the PLC Gateway Configuration Form Instructions 3 3 4 PLCG Counter Processing Emulated DHP counters are updated by the free running scan from PLC memory 3 4 PLCG HIWAY AND BOX SLOT DATA POINTS PLCG hiway data points contain parameters that define the PLCG s emulated Data Hiway to the system PLCG box data points contain parameters that define the emulated DHPs boxes on the emulated hiway and assign a box number or hiway address to each DHP One box point is configured for each of the up to eight emulated DHPs Both hiway and box points are built with the Data Entity Builder To access the Parameter Entry Displays for these points on the Engineering Main Menu select HIWAY GATEWAY then on the next menu select HIWAY CONFIG or BOX SLOT CONFIG 3 4 1 Hiway Point Parameters For information on the functions value types ranges and access levels of these parameters refer to the PLC Gateway Parameter Reference Dictionary and to the PLC Gateway Configuration Form Instructions 3 4 2 Box Slot Data Point Processing Box data points are not scheduled for processing nor processed at regular intervals like other data points are Their paramete
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