SBC PCD2.W745 User manual

Document 26-796 | Edition ENG06 │ 2018-10-12
Manual
PCD2.W745 and PCD3.W745

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Content
0-1
0
0 Content
0.1 Document History ...........................................................................................0-2
0.2 Brands and trademarks .................................................................................0-2
1 Hardware
1.1 Introduction .....................................................................................................1-1
1.1.1 General ...........................................................................................................1-1
1.1.2 Function and application .................................................................................1-2
1.1.3 Main characteristics ........................................................................................1-2
1.1.4 Typical areas of use ........................................................................................1-2
1.2 Technical Data ................................................................................................1-3
1.3 Terminals and meaning of LEDs .....................................................................1-5
1.4 Presentation ...................................................................................................1-6
2 Conguration
2.1 Congurationofthemodule...........................................................................2-1
2.2 Operating modes ............................................................................................2-2
2.3 Conguration&connectionexamples............................................................2-4
3 Programming
3.1 Programming with Saia PCD®Classic ............................................................3-1
3.1.1 Programming with Saia PG5®FBoxes...........................................................3-1
3.1.2 Programming with FBs ...................................................................................3-4
3.2 Programmingwithseriesxx7.........................................................................3-7
A Appendix
A.1 Icons ...............................................................................................................A-1
A.2 ProgrammingexamplesforSaiaPCD®Classic systems ...............................A-2
A.3 Programmingexamplesforxx7series(inpreparation)..................................A-6
A.4 CongurationonPCD3.T760RIOModule.....................................................A-7
A.5 Contact ..........................................................................................................A-8

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Content
0-2
0
0.1 DocumentHistory
Date Version Changes Remarks
2003-12-01 pEN01 - Preliminary Edition
2005-05-01 EN01 - Published Edition
2005-09-19 EN02 - New picture:
1.4 Block diagram
2012-05-02 EN03 - RegistersforusinginPCD3.T760
2012-08-10 EN04 - AppendixA:Addedchapter4Congurationon
PCD3.T760RIOModule
2013-10-10 EN05 - New logo and new company name
2018-10-10 ENG06 Chapt. A- Newphonenumber(validfromFebruary2015)
0.2 Brandsandtrademarks
Saia PCD®and Saia PG5®
are registered trademarks of Saia-Burgess Controls AG.
STEP7®,SIMATIC®,S7-300®,S7-400®, and Siemens®are registered trademarks of
Siemens AG.
Technicalmodicationsarebasedonthecurrentstate-of-the-arttechnology.
Saia-Burgess Controls AG, 2018. ©Allrightsreserved.
Published in Switzerland

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Hardware
1-1
1
Introduction
1 Hardware
1.1 Introduction
1.1.1 General
ThePCDx.W745isaprecisionanalogueinputmodulefortemperaturemeasurement
application.Linearizationandeachkindofcompensationaswellasconversioninto
°C, °F and K are carried out on this module. The module has four input channels,
whichcanbeconguredindividually.
Supported temperature sensors are:
● Thermocouples–TCtypeJ,K
● Resistivetemperaturedetectors–RTD’stypePt100,Pt1000,Ni100,Ni1000
Further, the module supports all common measurement techniques:
ForRTDs:
● Twowiresensorconnection
● Threewiresensorconnection
● Fourwiresensorconnection
For Thermocouples:
● Internalcoldjunctioncompensation:Thesensorsaredirectlyconnectedtothe
module I/O terminal.
● Externalcoldjunctioncompensation:Anexternalisothermalblockcanbeused.
 Thetemperatureoftheexternaljunctionismeasuredusingchannel0.
Thecongurationofthefourinputchannelsisdonebysoftware.Everychannelcan
be used independently of the others.
Diagnostics:
ThemodulePCDx.W745providespowerfulsensordiagnostics:
● Overrangedetection
● Underrangedetection
● Linebreakdetection
● ShortcircuitdetectionforRTD’s
Galvanic separation:
ThemodulehasgalvanicseparationbetweenSaiaPCD®ground and the sensor
interface(500VDC).

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Hardware
1-2
1
Introduction
1.1.2 Functionandapplication
ThePCDx.W745moduleisusedtomeasuretemperaturesinprecisionandwide
temperature range applications.
On the module, a micro controller controls the acquisition of the input signals. De-
pendingthecongurationthecontrolleradjuststhemeasurementamplier,multi-
plexesthecurrentsourcestothesensors,andcontrolsthesamplingoftheinput
channels.
Thelinearizationcurvesforthesupportedtemperaturesensorsarestoredonthe
module.Therefore,theCPUcandirectlyreadtemperaturevaluesfromthemodule.
The powerful sensor diagnostics allows to detect wiring errors. So the module indi-
cateswhenasensorlineisbrokenornotconnected.Further,overrangeandunder-
range diagnostics indicates misuse of the chosen sensor type.
1.1.3 Maincharacteristics
● Highprecisiontemperatureacquisitionsystem
● GalvanicseparationbetweenSaiaPCD®ground and input interface
● Themodulesupportsabignumberofsensortypes
● ThermocouplesandRTDsonthesamemodule
● Fourinputchannels,software–congurable
● Built–inreferencejunctionforthermocouples
● Possibilitytouseexternalreferencejunction
● RTDmeasurementtechniques:2-,3-,4-Wireconnection
● 4inputclampsperchannel
1.1.4 Typicalareasofuse
● Temperatureregulation/supervisioninindustrialapplications
● Measurementofveryhightemperaturesusingthermocouples

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Hardware
1-3
1
Technical Data
1.2 TechnicalData
Technical specication
Allspecicationsat25°Cambienttemperature,unlessotherwisenoted.
Sensor types TC Type J TC Type K Pt100
Pt1000
Ni100
Ni1000
Input range for tempera-
ture sensors
-210…1200°C¹
DIN IEC 584
-270…1372°C¹
DIN IEC 584
-200…850°C
DINIEC751
-60…250°C
DINIEC43760
Measurement range -75mV…+75mV Pt/Ni100:0…600Ω
Pt/Ni1000:0…5000Ω
Resolution
0.1°C 0.1°C
2.5μV 0.01Ω(600Ωrange)
0.10Ω(5000Ωrange)
Measuring error in % of
fullscalevalue² 0.05 % 0.05 %
Measuring error
in °C
Alternativetothe“measuringerrorin%”specicationabove:
-100…+100°C:<0.4°C
-150…+500°C:<0.7°C
-150…+1000°C:<1.0°C
-100…+100°C:<0.3°C
-150…+500°C:<0.4°C
-200…+850°C:<0.5°C
Temperaturecoe󰀩cient
offullscalevalue² 10 ppm/K 80 ppm/K
Sampling time
per channel 250 ms
Measurement resolution 16 bit
50Hzrejection
60Hzrejection >75dB > 60 dB
Line break detection    
Short circuit detection x x  
Linearization on Board
Compensation of cold
junctiontemperature on Board N/A
Coldjunctioninternal Yes³ N/A
Coldjunctionexternal Yes N/A
Connection techniques
forresistors(RTD’s) N/A
2-wire
3-wire
4-wire
Galvanicisolation 500 VDC between Saia PCD®and analogue inputs
¹)Forthermocouples,thefullmeasurementrangeiso󰀨ered.Thespecicationsofresolutionandaccu-
racyaregivenfortemperatureshigherthan-150°C.Forlowertemperaturesthan-150°C,thechar-
acteristicsofthermocouplesbecomeworse.Ifthermocouplesareusedinthisverylowtemperature
range,thetoleranceshouldbecalculatedusingthetolerancespecicationsforthe±75mVrangeand
the thermocouple characteristic.
²)Measuringerrorin%andtemperaturecoe󰀩cientspecicationsmadeforthemeasurementranges
±75mV,600Ω,5000Ω.
³)Technicaldataoftheinternalcoldjunctionarespeciedinthefollowingsection.

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Hardware
1-4
1
Technical Data
General specications
PCD2.W745 Temperaturemodule,supportsthermocouplestypeJ,Kand
RTD’stypePt100,Pt1000,Ni100,Ni1000
→SuitableforPCD1&PCD2systems
PCD3.W745 Temperaturemodule,supportsthermocouplestypeJ,Kand
RTD’stypePt100,Pt1000,Ni100,Ni1000
→SuitableforPCD3systems
Ambient temperature Operation: 0...+50°Cwithoutforcedventilation
Storage: -25...+85°C
Power supply: Noexternalpowersupplynecessary
Internal power consumption
from+5Vbus: 200 mA
Wiregauge: max.0.5mm²(AWG20)
WireStripping: Remove10mmofisolation
Internal reference junction (internal cold junction)
Thebuilt-inReferenceJunctionisusedwhenthermocouplesaredirectlyconnected
to the module.
Built-in Temperature sensor
Operating temperature range: 0…55°C
Resolution: 0.1°C
Measuring error at 25°C: 0.8°C
DriftoveroperatingTemperatureRange(0…55°C): 0.05°C/°C
Stabilization time: 5 min.
TheCPUsPCD1/2/3andthebasicunitsPCD3providethefollowinginternalsupply:
Type +5 V V+
PCD3.Mxxxx 600 mA 100 mA
PCD3.C200 1000 mA 100 mA
PCD3.T76x 650 mA 100 mA
PCD2.M1xx 1600 mA 200 mA
PCD2.M48x 2000 mA 200 mA
PCD1.M1xx 750mA 100 mA
UsersofPCDx.W745modulesareurgedtochecktheoverallcurrentconsumptionof
allmodulesinaPCD1/2/3andinanyC100orT76xexpansionunitstoensurethat
thismaximumisnotexceeded.
Whenworkingwithanexpansionunitandupto8W745modules,itisbettertoplace
thePCDx.W745modulesinthebaseunitandtoplug“normal”I/Omodulesintothe
expansionunit.Thiswilleliminateanyinuencessuchasapossiblevoltagedrop
overtheconnectingcablefromtheexpansionunittothebaseunit.

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Hardware
1-5
1
TerminalsandmeaningofLED’s
1.3 TerminalsandmeaningofLEDs
The I/O connector block is numbered from 0 to 16, beginning on the right hand side.
Error
Sensor Error
Run
Rth3+
Sens3+ +
Sens3-
GND
Rth2+
Sens2+ +
Sens2
-
GND
Rth 1+
Sens1+ +
Sens1
-
GND
Rth0+
Sens0+ +
Sens0
-
GND
Input 3
Input 2
Input 1
Input 0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
16
GND
Label description
Name Description
RthX+ ConstantcurrentoutputforRTDmeasurement
SensX+ Positivelineofthedi󰀨erentialvoltageinput(Sense+)
SensX- Negativelineofthedi󰀨erentialvoltageinput(Sense–)
GND SensorGround,galvanicseparatedfromSaiaPCD®Ground
X:InputNumber0…3
Meaning of the LEDs:
Run:   TheRunLEDblinkswhenthedataacquisitionisrunning
Error: The Error LED indicates that the module
hasnovalidconguration.
Sensor Error: Indicates that at least one of the inputs detects:
   ● noconnection
   ● linebreak
   ● shortcircuit
Thismoduleincludescomponentsthataresensitivetoelectrostaticdischarges.

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Hardware
1-6
1
Presentation
1.4 Presentation
Assembled module
Bus interface
Bus connector
power supply
Optocoupler
A/D converter
Analogue circuitry
Input filtering (EMC)
Diagnostic LEDs
Input clamp terminal
Galvanic separated
Block diagram
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
16
EMC Filter
source
&
MUX
Temperature
sensor
CJC int.
Input
Multiplexer
Optocoupler
SPI interface
I/O Bus interfaceBus connector
DC/DC converter
Insulated power
supply
Constant current

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
2
Conguration
2-1
Congurationofthemodule
2 Conguration
2.1 Congurationofthemodule
Themodulehasfourinputchannels,whichareindividuallycongurable:
Input ranges / sensor types:
Thermocouples(TC) TypeJ/KaccordingtoIEC584
ResistiveTemperaturedetectors(RTD) Pt100/Pt1000accordingtoIEC751
Ni100/Ni1000accordingtoDIN43760
Sensor type Range Output value Units
TC
Type K
(NiCr-Ni) -270…+1372°C -454…+2501°F
+3…+1645K
-2700…+13720
-4540…+25010
+30…+16450
1/10°C
1/10°F
1/10 K
TypeJ
(Fe-CuNi) -210…+1200°C -346…+2192°F
+63…+1473K
-2100…+12000
-3460…+21920
+630…+14730
1/10°C
1/10°F
1/10 K
RTD
Pt100 -200…+850°C
-328…+1562°F
+73…+1123K
-2000…+8500
-3280…+15620
+730…+11230
1/10°C
1/10°F
1/10 K
Pt1000 -200…+850°C
-328…+1562°F
+73...+1123K
-2000…+8500
-3280…+15620
+730…+11230
1/10°C
1/10°F
1/10 K
Ni100 -60…+250°C
-76…+482°F
+213…+523K
-600…+2500
-760…+4820
+2130…+5230
1/10°C
1/10°F
1/10 K
Ni1000 -60…+250°C
-76…+482°F
+213…+523K
-600…+2500
-760…+4820
+2130…+5230
1/10°C
1/10°F
1/10 K
mV ±75mV -75…+75mV -30000…+30000 2.5μV*
Ohm 600Ω 0…600Ω 0…60000 10mΩ
5000Ω 0…5000Ω 0…50000 100mΩ
*mVrange:Outputvalue•2.5=voltageinμV
Connection & compensation techniques:
Connection / compensation techniques
RTD
Ohm
2–Wireconnection
3–Wireconnection
4–Wireconnection
TC Internalreferencejunction(CJCint.)
Externalreferencejunction(CJCext.)**
mV Voltage measurement using sense inputs
**Inthisoperatingmode,input0isusedtomeasurethetemperatureofthe
externalreferencejunction.

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
2
Conguration
2-2
Operating modes
Measurement unit:
Themeasurementunitfortemperaturesensorscanbeconguredpermodule:
°C: Temperature output in 1/10 °C
°F: Temperature output in 1/10 °F
K: Temperature output in 1/10 K
ForvoltageandOhminputranges,thiscongurationtakesnoe󰀨ect.
2.2 Operatingmodes
RTD and resistance measurement
ThemodulesupportsdirectconnectionofResistiveTemperatureDetectors(RTDs).
For this purpose, a precision current source supplies the sensors with a measure-
mentcurrentof250μA.
2 – Wire connection
The wiring resistance can not be compensated.
PCD x.W745
RthX+
SensX+
SensX -
GND
3 – Wire connection
Thevoltagedropoveroneofthetwosupplylinesismeasured.Assumingthatboth
supplylineshavethesameresistance,thewiringerroriscalculatedandcompen-
sated.
• Usethesamewiretypeforbothsupplylines
• Besurethatthelength/temperaturedistributionoverbothsupplylinesisiden-
tical
PCD x.W745
RthX+
SensX+
SensX - GND
RTD

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
2
Conguration
2-3
Operating modes
4 – Wire connection
Inthisoperatingmode,theinuenceofthesupplylinesiscompletelyeliminated.The
e󰀨ectivevoltageonthetemperaturesensorismeasuredusingtwohigh–impedance
sense lines.
PCD x.W745
RthX+
SensX+
SensX-
GND
RTD
Thermocouple measurement
ThemodulePCDx.W745canbeconguredtomeasuretemperatureusingthermo-
couples.
Physical principle (Seebeck voltage):
Thetwodi󰀨erentmetalsofthethermocouplegenerateasmallvoltage,whenthe
measurementjunctiontemperatureisdi󰀨erentfromthereferencejunctiontempera-
ture.Thisvoltageallowstodeterminethetemperaturedi󰀨erencebetweenthetwo
junctions.
Tocalculatetheabsolutetemperature,thereferencejunctiontemperaturemustbe
known.
Internal reference junction (CJC int. – Cold Junction Compensation internal)
In this operating mode, the thermocouples are directly connected to the input clamp
ofthePCDx.W745.Themodulemeasuresthetemperatureoftheclampterminaland
calculatesthetemperatureofthemeasurementjunction.
Thetemperatureoftheinputclampterminalshouldnotbeinuencedfromexternally,
forexamplethroughforcedairventilationorheatsourcesclosetotheclampterminal.
External reference junction (CJC ext. – Cold Junction Compensation external)
Thismodeisusedwhenanexternalisothermalclampisused.Thethermocouples
areconnectedtotheisothermalclamp;thevoltagesignalfromthethermocouplesis
transmitted to the module using copper wires.
Tocalculatetheabsolutetemperatureatthemeasurementjunction,thetemperature
oftheexternalisothermalclampterminalmustbemeasured.OnthemodulePCDx.
W745,input0isusedtoacquirethistemperature.Allselectabletemperaturesensors
canbeusedforthemeasurementoftheexternalreferencejunctiontemperature.

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
2
Conguration
2-4
Conguration&connectionexamples
Connection of thermocouples
PCD x.W745
RthX+
SensX+
SensX -
GND
Voltage measurement
Connection of ± 75 mV signal sources
PCD x.W745
RthX+
SensX+
SensX -
GND
Voltage source
(± 75 mV)
2.3 Conguration&connectionexamples
General example for RTD and thermocouple connection:
Input 3
Sensor:
TC K
Comp.:
CJCint
Rth3+
Sens3+
Sens3 -
GND
Input 2
Sensor:
Pt100
Conn.:
3-wire
Rth2+
Sens2+
Sens2 -
GND
Input 1
Sensor:
Ni 1000
Conn.:
2-wire
Rth1+
Sens1+
Sens1-
GND
Input 0
Sensor:
Pt100
Conn.:
4-wire
Rth0+
Sens0+
Sens0 -
GND
RTD
Pt100
RTD
Pt100
RTD
Ni1000
PCDx.W745

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
2
Conguration
2-5
Conguration&connectionexamples
Use of an external isothermal block (CJCext)
Input 0 temperature is used to make the
coldjunctioncompensationforallthermo-
coupleinputsconguredforCJCext.
(Inthissetupforchannel2)
Externalreferencejunction(CJCext.)
Isothermal block
RTD:Pt100/4-wire,usedtomeasurethe
temperature of the isothermal block
Input 3
Sensor:
TC J
Comp.:
CJCint
Rth3+
Sens3+
Sens3 -
GND
Input 2
Sensor:
TC K
Comp.:
CJCext
Rth2+
Sens2+
Sens2-
GND
Input 1
Sensor:
Ni 100
Conn.:
3-wire
Rth1+
Sens1+
Sens1-
GND
Input 0
Sensor:
Pt100
Conn.:
4-wire
Rth0+
Sens0+
Sens0 -
GND
Thermo
couple
type J
Thermocouple
type K
RTD
Ni100
PCDx.W745
Copper wires

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Programming
Programming with PCD Classic
3
3-1
3 Programming
3.1 ProgrammingwithSaiaPCD®Classic
3.1.1 ProgrammingwithSaiaPG5®FBoxes
Fortheeasyuseofthetemperaturemodule,anFBoxcalledPCD2.W745isincluded
inthestandardanalogueFBoxlibraryofSaiaPG5®.
Firstofall,thisFBoxallowsconguringthemoduleaccordingtotheindividualmeas-
urementsetup.OncetheFBoxhasconguredthemodule,itswitchesautomatically
indataacquisitionmode.Inadditiontothereadingoftheanaloguevaluesfromthe
W745,theFBoxdeliverspowerfuldiagnosticinformationaboutsensorfailures.
Forcorrectworking,theFBoxshouldbeplacedinacyclicorganisationblock(COB).
FBoxname: AnamecanoptionallybegiventotheFBox.
WhenseveralFBoxesareused,FBoxmusthaveanindividualname.
in0…in3: Analogueinputvalues(Format/Unit:Seechapter2)
Error: Channel errors, one byte per input channel:
Error register
Input 3 Input 2 Input 1 Input 0
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 76 5 4 3 2 1 0
xxxx xxxx xxxx xxxx
Comm. error Comm. error Comm. error Comm. error
Sensor error Sensor error Sensor error Sensor error
Underrange Underrange Underrange Underrange
Overrange Overrange Overrange Overrange
 Overrange: Measuredvalueistoohighforselectedrange
 Underrange: Measuredvalueistoolowforselectedrange
Sensor error: Line break / Open line / No sensor connected
 Comm.error: Communicationerror(noresponsefrommoduleW745)
 X:  Notused
Add: Module base address
LED: Green: Everythingok
 Red:  Atleastoneerrorbitset

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Programming
Programming with PCD Classic
3
3-2
AdjustWindow:
Error Display of communication errors with the module.
Clear button Button to clear the error.
Initialize module Shows module initialization progress.
Init button Buttontoforcemanuallyacheckofthemoduleconguration.If
necessary,themodulewillberecongured.
Temperature unit Selection of temperature unit:
-Celsius:Temperaturevaluesin1/10°C
-Fahrenheit: Temperaturevaluesin1/10°F
-Kelvin: Temperaturevaluesin1/10K
Channel 0 to 3:
Sensor type Selection of sensor type.
Conguration/Connection Selectionofinputconguration/connection.
O󰀨set Optionalconstanttemperatureo󰀨settocorrectcablingorsensor
error.
Filter T2 OptiontoinsertaT2lter.Theuseofthelterrequires5supple-
mentary registers for each channel
Filter time Timeconstant(2timesthesamevalue)oftheT2lter.
Diagnose Diagnoseofthechannel.ShowsOverrange,Underrange,Sensor
failure and Communication error.

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Programming
Programming with PCD Classic
3
3-3
Conguration/Connection
Voltage 2 Wires 3 Wires 4 Wires Internal
comp
External
comp
Sensor type
Not Used 
Pt100 
Pt1000 
Ni100 
Ni1000 
R600 
R5000 
K 
J 
Voltage 
Remarks:
● WhenCJCextiscongured,thetemperatureoftheexternalreferencejunc
 tionismeasuredusingchannel0.Therefore,channel0can’tbeconguredfor
 CJCext.
● Ifawrongcongurationissenttothemodule,theNoCongindicatorbecomes
high and the module does not go in data acquisition mode.
Fordetailedinformationaboutconnectionanduseofthedi󰀨erentsensortypes,
please refer to chapter 2.

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Programming
Programming with PCD Classic
3
3-4
3.1.2 ProgrammingwithFBs
TousethePCDx.W745inSaiaPCD®Classicsystems,FBsaredeliveredinthe
Saia PG5®package.
FB Init
The Init FB has the following parameter structure:
FB Init
Parameter Type Description
K 1…16 [K] input moduleNumberaccordingtoleD2W745_B.mba
TC_K* [K] input Sensor type CH0
CJCint* [K] input Conguration/connectionCH0
TC_K* [K] input Sensor type CH1
CJCint* [K] input Conguration/connectionCH1
TC_K* [K] input Sensor type CH2
CJCint* [K] input Conguration/connectionCH2
TC_K* [K] input Sensor type CH3
CJCint* [K] input Conguration/connectionCH3
Celsius* [K] input Measurement unit
InitError [F] output Initialization error indicator
WrongCong [F] output Noorwrongcongurationindicator
NoCalibration [F] output Internal module calibration check
*Seetablebelowforpredenedcongurationcodes.
Predenedcongurationcodesforthesupportedtemperaturesensors:
Conguration / Connection
CJCint CJCext R2wire R3wire R4wire Voltage NotUsed
Input range
TC_K  
TC_J  
Pt100   
Ni100   
Pt1000   
Ni1000   
U75mV 
R600   
R5000   
NotUsed 
● WhenCJCextiscongured,thetemperatureoftheexternalreferencejunction
ismeasuredusingchannel0.Therefore,channel0can’tbeconguredfor
CJCext.
● Ifawrongcongurationissenttothemodule,theNoCongindicatorbecomes
high and the module does not go in data acquisition mode.
Predenedcongurationcodesforthemeasurementunit:
Celsius Temperaturevaluein1/10°C Themoduleconvertsthemeasuredvalue
in the selected measurement unit.
Fahrenheit Temperaturevaluein1/10°F
Kelvin Temperaturevaluein1/10K

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Programming
Programming with PCD Classic
3
3-5
Thetemperatureunithasnoinuencetovoltage/ohmmeasurementranges.
FB Exec
Parameter structure:
FB Exec
Parameter Type Description
K 1…16 [K] input ModuleNumberaccord.toleD2W745_B.mba
ValueCH0 [R]output MeasuredvalueCH0
OverR_0 [F] output OverRangeindicatorforinput0
UnderR_0 [F] output UnderRangeindicatorforinput0
SnsFail_0 [F] output Sensor fail indicator for input 0
T CH1 [R]output Temperaturevalueinput1in1/10[Unit]
OverR_1 [F] output OverRangeindicatorforinput1
UnderR_1 [F] output UnderRangeindicatorforinput1
SnsFail_1 [F] output Sensor fail indicator for input 1
T CH2 [R]output Temperaturevalueinput2in1/10[Unit]
OverR_2 [F] output OverRangeindicatorforinput2
UnderR_2 [F] output UnderRangeindicatorforinput2
SnsFail_2 [F] output Sensor fail indicator for input 2
T CH3 [R]output Temperaturevalueinput3in1/10[Unit]
OverR_3 [F] output OverRangeindicatorforinput3
UnderR_3 [F] output UnderRangeindicatorforinput3
SnsFail_3 [F] output Sensor fail indicator for input 3
NoResponse [F] output Module not ready indicator
Temperaturevalue:
SignedInteger,representsthemeasuredvalueaccordingtotheselectedinputrange.
Diagnosticags:
Overrange/Underrangeindicatorsbecomeactivewhenthemeasurementvalueis
outsideofthespeciedrangeforthechosensensortype.
Sensorfailindicateserrorsinsensorconnection.ForRTDs,shortsandopenscanbe
detectedonboth,supplylinesandsenselines.Forthermocouples,theagindicates
line break.
NoResponse:
NoresponsefromW745.Checkifthemoduleispresentonthechosenbasead-
dress.
FB Status
Parameter structure:
FB Status
Parameter Type Description
K 1...16 [K] input moduleNumberaccord.toleD2W745_B.mba
MeasRun [F] output High when data acquisition is running
DiagRun [F] output High when sensor diagnostic is running
ComRun [F] output HighwhencommunicationtoW745ok

Saia-Burgess Controls AG
Manual for PCD2.W745 and PCD3.W745 │Document 26-796 ENG06 │ 2018-10-12
Programming
Programming with PCD Classic
3
3-6
MeasRunning:
High state indicates that the data acquisition is running.
Afterstart-up,thisindicatorstayslowduringtherstsamplingcycle.Atthetimeit
goeshigh,allofthefourinputchannelshaveanactualvaluewhichcanbereadout.
DiagRunning:
Highstatemeansthatthesensordiagnosticisrunning(Overrange/Underrange/
SensorFail)
Afterstart-up,theDiagRunningagstayslowduringtherstsensorfailcheckcycle.
Whenitswitchestohighstate,allsensorsarecheckedandthechanneldiagnostics
arevalid.
ComRunning:
Thisagbecomeshighwhenthecommunicationtothemoduleisok.
Installation of the FBs
Thefollowing3lesarenecessary:
● D2W745_B.src
● D2W745_B.equ
● D2W745_B.mba
Saia PG5®libraryles:
The*.srcandthe*.equlesshouldbeintheSaiaPG5®FB library:
C:\…\SBC\PG5xxx\Libs\FB\...
ModuleBaseAddressdenition:
The*.mbalemustbeaddedtotheSaiaPG5®project.Thislecanbemodiedby
theuseraccordingtothenumberofusedW745modulesandthecorrespondingbase
addresses.
Include the FBs:
TheleD2W745_B.equmustbeincludedintheprogramlebeforetheFBscanbe
called:
$INCLUDE D2W745_B.equ
Use in a cyclic organisation structure
ThesamplingtimeofthePCDx.W745moduleis250msperchannel.Toachievebest
systemperformance,itisrecommendedtoimplementa‘NoCommunication’timer.
IntheexampleintheAppendixa100mstimerisimplemented.SotheFBsExec
andStatusareexecutedinmaximumevery100ms.Thisreducesunnecessarydata
transfersontheI/OBusandimprovesthesystemperformance.