Electronics FIT 7223 User manual

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!Kindlyforwardthisproductmanualtotheenduser.
Theuser is requestedto read themanual thoroughly
beforeoperatingtheinstrument.
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Warranty CertificateWarranty Certificate
Warranty CertificateWarranty Certificate
Warranty Certificate
This instrument is warranted against any manu-
facturing defects for a period of twelve months
from the date of installation, or eighteen months
from the date of supply, which ever is early.
Kindly note that:
1. The warranty is limited to repairing the instru-
ment and no responsibility is taken for any
other damage resulted
2. The warranty will be void if the instrument is
opened or tampered in any way
3. The faulty instrument has to be returned to
our factory, carriage prepaid & duly insured.
ProductCategory : Programmable
Process Controller
Model No. : FIT 7223
Serialnumber : ________________
Dateofdespatch : ________________
Authorizedsignatory : ________________
Companyseal
WarrantyCertificate ...
PROGRAMMABLE PROCESS CONTROLLER
TheInsideStuff
AsYouUnpack ................. 2
Introduction ................. 3
PrincipleOfOperation ................. 4
Features ................. 4
Specifications ................. 5
Illustrations ................. 6
Operation ................. 7
Modesof Operation ................. 8
ProgrammingFlowChart ................. 9
InstallationProcedure ................. 13
Calibration Procedure ................. 14
ModbusProtocol ................. 16
ImportantTerms ................. 19
WarrantyCertificate ................. 20
20 1

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As you unpack
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Everyattemptismadetomakethismanualclearandeasyto
understand,so thattheuser caninstall,takecare ofandfeel
confident in using our product.We welcome your valued
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document and make it more user friendly.
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Congratulations
on buying a
Programmable Process Controller!
Asyou unpackkindlyensure that
1.Thematerialreceivedisingoodcondition
2.Youhavereceivedthefollowingmaterial:
a) ProgrammableProcessController as per your
order
b) Mountingbracket pair
d) ThismanualalongwithWarrantycertificate
In case of any discrepancies contact our customer support
departmentimmediately.
We are sure you will get long and trouble free service
from our system.
219
Important Terms
1) ControlLogic (CL):The logic forrelayactuation,i.e.
a)CL= HighControlAction.The control action is
suchthattheprocesstemperaturemustnotgoabovethe
setpoint.Processvalue<SetpointRelayON
Thisisgenerallyusedinheatingapplications.
b)CL= Low ControlAction.The control action is
suchthatthe process temperature must not go below the
setpoint.Processvalue>SetpointRelayON
Thisisgenerallyusedincoolingapplications.
2) Hysteresis:The On / Off differentialgapforan On / Off
controller.Figuresbelowshow thehysteresisfor bothhigh
and low control logic.
Arrowsindicate Process temperature trajectory.
SP = Setpoint
HYS = Hysteresis

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Introduction
Flowindicators
and totalizers
play an
mportantpartin
any process
industry.Quick
and accurate
measurement
and controlof
aprocessvalue
will improve
the final
product
quality,
reliability and
reduce
rejection.
Process indication and control is therefore one of the prime
considerationsinanyprocessindustry
TheFIT7223seriesisaMicrocontrollerbasedProcessIndicator
cumControllerwithuserfriendlyprogrammingfacility.TheFIT
7223has been designed forfastandaccurate measurement and
controlof process value. Linearisationofsignalsprovides high
accuracy even for most nonlinear sensors. The instrument is
designedusinghighly reliable electronic components. Process
valueisdisplayeddirectlyindigits,givingbetterresolution.
The FIT 7223 accepts 4 - 20 mA as input. Wide ranges of
measurementsare available depending on thesensor used.
Theinstrument is immune to mechanicalvibrations.Even the
mountingpositionwillnotaffectthemeasurementaccuracy.
ProgrammableProcessController FIT7223
18 3

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Useofhighlyreliableelectroniccomponentswithlowtempearature
coefficientensures long andtroublefreeservice.The instrument is
testedforitsperformanceundervariousclimaticconditions.
Principle of Operation :
TheFIT7223seriesisbasedontheprinciple highinputimpedance
amplifierfeedingan analog to digital convertor. The input signal
generatedbythetransducerisfedtoasignalconditioningamplifier,
outputofwhichisdigitisedbytheADC.Thisdigitalsignalislinearised
by software, displayed and compared to the set value by the
microcontroller whichinitiates the programmedrelayaction. The
linearisation,displayandrelaysarecontrolledbythemicrocontroller
byvirtue ofthesystem software.
Features :
#Microcontrollerbasedlogic
#Linearisationof controlledvariableachievedthrough
softwaregivinghighaccuracy
#Highlycompact
#Dustand verminproofenclosure with epoxypowder
coating.
#Userselectable ControlLogic
#Programmingthroughtactilemembranekeys
#NVRAMenables data storageevenineventsofprolonged
powerfailure
#Fastresponse time
#RS 232 / RS 485 Modbus protocol supported
#Failsaferelaylogic
#MaximumMTBFandminimumMTTR
417
Function : Read Input Registers ( 04
)
Message Format : (Response by the slave forthe request initiated by the master)
Message Format : (Request initiated by the master)
Slave
Address Function Code Start Address
( Hi ) ( Lo )
No. of points
( Hi ) ( Lo )
CRC
( Lo )
( Hi )
xx 03 or 04 0300 0000 xx xx
Slave
Address Function Code Start Address Flow value
( Hi ) ( Lo )
CRC
( Lo )
( Hi )
xx 03 or 04 xxxx
( Hi )
xx xx xx
( Hi ) ( Lo )
xxxx
( Hi ) ( Lo )
xxxx
1st setpoint
value 2nd setpoint
value
Function : Read Input Registers ( 04 )
Message Format :
(Response by the slave forthe request initiated by the master)
Message Format : (Request initiated by the master)
Slave
Address Function Code Start Address
( Hi ) ( Lo )
No. of points
( Hi ) ( Lo )
CRC
( Lo )
( Hi )
xx 03 or 04 050a 0000 xx xx
Slave
Address Function
Code
Start
Address
( Hi )
Decimal value
for digit 1 & 2
( Hi ) ( Lo )
CRC
( Lo )
( Hi )
xx 03 or 04 xxxxxx xx xx
( Hi ) ( Lo )
xxxx ( Hi ) ( Lo ) xxxx ( Hi ) ( Lo ) xxxx
Decimal value
for digit 3& 4 Decimal value for digit 5& 6 Decimal value
for digit 9 &10
Decimal value
for digit 7 &8
( Lo )
xx
( Hi ) xx
Function : Read Input Registers ( 16 )
Message Format :
(Request initiated by the master)
Slave
Address Function Code Start Address
( Hi ) ( Lo )
No. of points
( Hi ) ( Lo )
CRC
( Lo )
( Hi )
x
x10 xxxx xxxx xx xx
Message Format : (Response by the slave forthe request initiated by the master)
Slave
Address Function
Code
A
ddress
value
( Hi ) ( Lo )
CRC
( Lo )( Hi )
x
x10
x
x
x
x
x
x
x
x
( Hi ) ( Lo )
xxxx
Quantity
value ( Lo )( Hi )
xx xx
( Lo )( Hi )
xx xx
Number of
points
( Hi )
xx
1st setpoint
value 2nd setpoint
value

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Model :FIT7223
Control action : On/ Off
Range :Programmablefrom 0to9999
Input : 4-20 mA
Indication accuracy : +/- 0.1 % of FS +/- 1 digit
Accuracy deviation due to
a) Temperature change : +/- 0.02 % / oC , ref at 25 oC
b) Supply Variation : +/- 0.01%/V
No. of Setpoints :Two
Setpoint Adjust and Read: Through Flat Membrane key pads and 4 digit
display respectively on front panel
Outputs :1set of potential free Relay change over contacts
rated 5Amp resistive at 230 VAC per setpoint
:24VDC, +/- 1V, @30 mAsupply
Relay logic : User selectable High or Low logic.
Relay ON indication : By Red LED per setpoint
On / Off hystersis : Programmable from 0.2to 9.9%
Display :16x2Alfa NumericLCD withback LED
Character size :2.95(W)x4.35(H)mm
Power supply :230VAC, +/-10% ,50 Hz
Ambient Temp. range : 0 to 55 oC
Sensor break indication : Up scale [ ]
Sensor break protection :Relay‘Off’(Relay ‘On’by demand)
RelativeHumidity : 90 % Non Condensing
Power consumption :6VA
Weight :900grams
Mounting : Flush panel mounting
Dimensions :96(W) x96(H)x 120(D)mm
Cutout :92x92mm,+1,-0mm
Communication :RS232/ RS485
Protocol : Modbus RTU
Device Address : Programmablebetween1 to 247
Baud Rate : Selectable between 1200 to 9600 kbps
Programming protection : Password protected. Default password is 191.
Specifications
16 5
Starting
Address
0000
0001
0002
Contents of the location
Process Value
Value of Setpoint No - 1
Value of Setpoint No - 2
Modbus Protocol
Communication : RS 232 or RS 485 2 wire
Protocol : MODBUS RTU
Device Address : Programmable from 1 to 247
Baud Rate : Selectable between 1200, 2400, 4800 or 9600 kbps
Parity : None
Data bits : 8
Stop bits : 1
Functions supported :
1. Read Input Registers ( 03 or 04 )
2. Preset Multiple Registers ( 16 )
Exception Codes :
1. Invalid Function Code ( 01 )
2. Invalid Start Address ( 02 )
3. Invalid Data Value ( 03 )

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B)RearView
Illustrations
A)Front view
615
92
92
NP
E
230 V AC
1 2 3
13 14
15
PNO
RL - 1
NC
16 17 18
P
NO
RL - 2
NC
F
FLOW INDICATOR TOTALISER
FIT 7223
OUTPUT
1
2
Flow: 400. 0 kg/hr
Totl: 3454545302
E L E C T R O N I C S
SYSTEMS AND DEVICES
Output Calibration procedure
Warning :This procedure is to be carried out strictly by
technicallyqualifiedpersonnelonly.
Theinstrumentiscalibrated atthefactoryusing0.05%accurate cali-
bratinginstruments.Nocalibrationshouldberequiredinnormalcase,
howeveriftheinstrument requiresre-calibration,the proceduretobe
followedisgivenbelow.
$$
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When display show span message then by using
increment and decrement key set 20 mA on the
multimeter. Display shows output count.
Press enter key.
When display show zero message then by using
increment and decrement key set 4 mA on the
multimeter. Display shows output count.
Press enter key.
Calibration Mode
F
RUN MODE
Note :
1. All values followed by Enter key will be stored,
else the value will be discarded.
2. All modes have password protection.
Default password is 191.
For output calibration connect a multimeter
at the mA output terminals. The password for
output calibration is191.

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Operation
BlockDiagram
1. Transducer:This isexternallyconnectedtothe instrument.
Typesavailableare 4-20/ 0-20 mAcurrentsignal
2. Signalconditioner: This circuit accepts the process signal
fromthe sensor performs thenecessarycompensation
(AmbientcompensationforT/Cand lead wire compensation
forPT- 100)andconvertsit into suitable signal levelforADC.
3. ADC: Thisis a 12 bit SuccessiveApproximationtypeADC
inbuiltthemicrocontroller. Itacceptstheanaloginputsignal,
convertsit into digital data and feeds it tothe processor for
further action.
4. Microcontroller: Thisistheheartoftheunitandis inter
facedto all otherperipherals.Thetransducers, membrane
keypad,display,memory andoutputrelaysfunctionunder
thecommandof themicrocontroller.
5. Memory: Therearetwo memory elements provided in the
circuit.One istheEPROMfor monitor(main)program storage
andtheotheristheNVRAMforstorageofvarioususer
Signal
Conditioner
Field
Field
Control
through
Contactor
Transducer
&
Transmitter
Amplifier Display
Keyboard Micro-
controller Relay
14 7
Input Calibration procedure
Warning :This procedure is to be carried out strictly by
technicallyqualifiedpersonnelonly.
Theinstrumentiscalibrated atthefactoryusing0.05%accurate cali-
bratinginstruments.Nocalibrationshouldberequiredinnormalcase,
howeveriftheinstrument requiresre-calibration,the proceduretobe
followedisgivenbelow.
$$
$$
$
Feed 20 mA from a stable source. Unit
displays the ADC count corresponding
input given.
Feed 4 mA from a stable source. Unit
displays the ADC count corresponding
to input.
Calibration Mode
D
RUN MODE
Note :
1. All values followed by Enter key will be stored,
else the value will be discarded.
2. All modes have password protection.
Default password is 191.

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programmedparameters andprocessvariables(even in events
ofprolongedpowerfailure).
6. Keypad: Feather touch membrane keys are providedon
thefront panelforuser programming.Thesekeys have
featureslikelonglife, negligible contact bounce, ease of
operation.
7. Display: The front panelcarriesalltheindications. These
arecontrolledbythe CPU. 16 column x 2 rowsAlfa numeric
LCDdisplayisused forindicatingvariousmessagesand
parametervalues.2 LED's indicate the relay status of 2 corre
sponding setpoints. Thisactsas aninterfacebetweenuser and
CPU.
8. Outputrelays: There are tworelays, one for each setpoint.
9. RS 232 : Serial port is for communication with a PC. For
modedetails on this, pls refer themodbusprotocolsection.
Modes of Operations :
1. ProgramMode:
Inthis mode the user can programallthesetpoints, control
actionetc.
2. Run Mode :
Inthis mode the display shows the process value.
Forprogramming sequence pleasereferprogramflow chart.
813
Installation procedure :
The instrument should be mounted in a place where it is clearly
visibleandaccessible.
1. Inserttheinstrumentinasuitable cutout andfixitusingthe
bracketpair provided on the sides.
2. Make the connectionsasshownin RearView diagram.
3. Allconnectionsshouldbefirm.
4. Connect the positive of the transmitterto'+' terminaland
negativeofpowersupplyto' - ' terminal. i.e Connet the
terminalsinserieswiththetransmitter.
5. Ensureproperearthingtotheinstrument.
6. Connect the RS 485 2 wires to the master instrument.
Alsoobserve "Precautions"asgiven inthismanual
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%
RUN MODE
E

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12 9
Display Process
Value & function
in accordance
with parameters
set in
Configuration mode
RUN MODE
Power On
Func
key pressed?
F
No
1. Enter will take the
program to
respective Modes.
2. Increment and
Decrement keys are
used to select between
the modes.
3. Function key will take
back to
RUN mode.
B
C
D
A
Configuration Mode
C
E
NN

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10 11
Program the hysterisys of setpoint no. 1
between 2 to 255 counts
Program the relay logic
high or low logic
of setpoint no. 1
between
Program the setpoint no. 1 value.
Setup Mode B
RUN MODE
Program the hysterisys of setpoint no. 2
between 2 to 255 counts
Program the relay logic
high or low logic
of setpoint no. 2
between
Program the setpoint no. 2 value.
Note :
1. In program mode if function key is pressed at any point, unit will branch to
auto mode.
2. All values followed by Enter key willbe stored, else the value will be discarded.
3. All modes have password protection. Default password is 191.
F
User can stop the totalizer action
by selecting "YES"
User can reset the totalizer value
over here by selecting "YES".
A
RUN MODE
Note :
1. In program mode if function key is pressed
at any point, unit will branch to auto mode.
2. All values followed by Enter key will be stored,
else the value will be discarded.
3. All modes have password protection.
Default password is 191.
F