GE IC670ALG620 User manual

This Datasheet for the
IC670ALG620
RTD 4 Channel Isolated 3 or 4 Wire input
http://www.cimtecautomation.com/parts/p-14496-ic670alg620.aspx
Provides the wiring diagrams and installation guidelines for this GE Field Control
module.
For further information, please contact Cimtec Technical Support at
1-866-599-6507
[e-mail]

Analog Input Module
RTD Input Module
IC670ALG620
GFK-1206D
June 1997
10
RTD Input Module (IC670ALG620)
datasheet GFK-1206D
The RTD Analog Input Module (IC670ALG620) accepts inputs from 4 independent 3-wire
and/or4-wireplatinum,nickel, nickel/iron,orcopperRTDs.
Module features include:
H Selectable resistance measurements in tenths of ohms, tenths of degrees Fahrenheit, or
tenths of degrees Celsius
H Individual channel configuration
H Selectable resistance ranges: 0 – 500 ohms and 0 – 3000 ohms
H Selectable RTD input as resistance or temperature (Celsius or Fahrenheit)
H Reportshigh/low, underrange/overrange, open wire and input short alarms.
H Uses optional discrete inputs and outputs for status and control.
H Two data acquisition rates based on 50 Hz and 60 Hz line frequencies
H Configurable channel activation
46722
1234
SLOT
Power Sources
No loop power is required for this module. The excitation current for the RTDs is provided by
the module, which automatically matches the excitation current to each configured RTD type.
LED
A single indicator shows module status:
H ON: normal operation
H Intermittent flashing: module fault
H OFF: loss of backplane power or fatal fault

RTD Input Module
GFK-1206D
Analog Input Module
2
June 1997
Module Operation
The RTD Input Module accepts four inputs from three-wire or four-wire RTDs and converts
the input level to a digital value. Input spans support a variety of RTD types, as listed in the
Module Specifications section.
The analog/digital converter reads the voltage generated by each of the four inputs. The A/D
converter converts the differential measurement into a binary value (15 bits plus sign),
which is read by the block’s microprocessor. The microprocessor sets the gain required in the
analog/digital converter for each individual input. The gain is based on the RTD type that
has been configured for that input.
The microprocessor selects the input by means of a solid state, optically-coupledmultiplexer.
Three measurements are made for each input: Excitationcurrent, RTD resistanceincluding
field wire drop, and field wire drop. From these three measurements, the module calculates
the RTD resistance. A DC/DC converter circuit isolates the field side from the logic circuits.
46723
Signal
Conditioning
and
Multiplexer
Excitation
Current
A/D
2.5V
Reference
2.5V
+5 V
–5 V DC/DC
FLASH
Logic
Opto
Micro–
Regulator 6.5V
SerialBus
5V
processor
Calibration
The module automatically performsA/Dcalibrationatpowerup.Automaticcalibration is
then repeated every minute to compensate for changes in the ambient temperature.
The module stores the calibration constants for each gain in RAM memory. This data can be
read and changed if necessary.

3
RTD Input Module GFK-1206D
Analog Input Module
June 1997
Host Interface
The RTD Input module has the following data types:
H 4 analog inputs (4 words)
H 32 bits of discrete input data for module and channel status (use of this data is optional)
H 8 bits of discrete output data for fault clearing to the module (also optional)
H Analog output data defaults to a length of 0, and should NOT be used for most
applications.
A starting reference and length in the Bus Interface Unit (BIU) data tables for each data type
is selected during module configuration. Depending on the configuration that has been set
up for each RTD, the input data can be reported as tenths of ohms, tenths of degrees
Fahrenheit, or tenths of degrees Celsius.
This module exchanges data with a BIU in the same manner as other types of I/O
modules—it provides all its input data and status bits when requested by the BIU, and
receives fault-clearing commands from the BIU via its assigned output bits. Note that the
BIU can be configured not to send status data over the network.
The module can also be configured for “Group” data transfer with the BIU or with other
intelligent devices in the same Field Control station. Group data transfer, and the steps for
configuring it, are described in the Bus Interface Unit User’sManual.
UnitsSelected IntegerRanges EngineeringUnits
Ranges
Tenths of Degrees –32767 to +32767 –3276.7 to +3276.7
Tenths of Ohms 0to65535 0 Ohms to 6553.5 Ohms
Compatibility
This module must be used with a Bus Interface Unit revision 2.0 or later.

RTD Input Module
GFK-1206D
Analog Input Module
4
June 1997
Module ConfigurationOverview
Like other Field Control modules, the RTD Input module is usually configured from the Bus
Interface Unit, using a compatible hand-held programmer. The module will also accept
configuration data from the bus when used in a system that supports such configuration.
The table below summarizes configuration choices and defaults. The module will power up
with the default configuration settings. For configuration instructions, refer to the Bus
Interface Unit User’s Manual.
Module
Parameter Description Default Choices
AnalogInput
DataLength Word length of the module’s analog input data in the BIU’s analog input (AI) data table. 40–4
AnalogInput
DataReference Startingoffsetforthemodule’sanaloginput dataintheBIU’s analog input(AI)table. userselectable
DiscreteInput
DataLength Bitlengthforthemodule’soptional status datainthe BIU’s discrete input(I)table. 32 0–32
DiscreteInput
DataReference Startingoffsetforthemodule’sstatusdata intheBIU’s discrete input (I)table. userselectable
Discrete
OutputData
Length
Bitlengthforthemodule’soptional
fault-clearingbitsintheBIU’sdiscrete
output(Q)table.
8 0–8
DisceteOutput
DataReference Startingoffsetforthemodule’soptional fault-clearingbitsintheBIU’sdiscete
outputtable.
userselectable
AnalogOutput
DataLength Word lengthfor analog output data in the BIU’sanalogoutput(AQ) table. Should not
beusedformostapplications.
0 0–4
AnalogOutput
DataReference Startingoffsetforthemodule’sanalog outputdata inthe BIU’sAQ table. userselectable
LineFrequency Specifiesthelinefrequency. 60Hz 50 Hz,60 Hz
ChannelActive Specifiesif the channelshouldreturndata
andalarms.Ifachannelis“inactive”space
isstillallocatedforit.
Active Inactive(off),Active(on)
Units Theconversion type for each RTD. Deg C tenths of ohms, tenths of degrees C, or
tenths of degrees F
RTD Type The type of RTD used for each channel. 100PT
385 10PT, 25 PT, 25.5 PT 392, 100PT 385, 100 PT 3902,100PT392,100PT3923,100PT3916,
1KPT 375,10 CU, 10 CU 427, 50 CU 427, 100
CU427, 100 NI, 100NI 618, 120 NI672 604
NI/FE518,1KNI/FE527,500Ohm,3000
Ohm
WireType The type of field wiring for each RTD. 3 Wire 3 Wire, 4 Wire
AlarmLow The low alarm limit for the channel, in
engineeringunits. –200 –32,768 to +32,767
AlarmHigh The highalarm limit for the channel, in
engineeringunits. 800 –32,768 to +32,767
Resistance Anoptionalresistanceadjustment,intenths
ofohms. 00to3276.7

5
RTD Input Module GFK-1206D
Analog Input Module
June 1997
Module Features
ChannelActive
Each channel can be configured as either active or inactive.
If a channel is inactive, it is not scanned and a value of 0 is returned to the BIU.
If a channel is active, and the configured analog input data length is not long enough to
accommodate the data for a particular channel, the data for that channel is still processed,
since the response to a group command may be used to transmit that channel’s data to the
BIU.
Low Alarm Limit and High Alarm Limit
Each input channel can have a low alarm limit and a high alarm limit. If an input reaches
one of its limits, the module reports the actual value and sends the appropriate diagnostic bit
in the discrete input table of the BIU. Alarms do not stop the process or change the value of
the input.
Alarm limits can be set anywhere over the dynamic range of the signal. The range for each is
– 32,768 to +32,767. The high alarm limit must be greater than the low alarm limit. If alarm
reporting is not wanted, alarm limits can be set beyond the dynamic range of the signal so they
will never be activated.
Input Selection to Include RTD Type
Each input channel can have a different RTD type, selectable from a list of many different
RTDs.
If the actual RTD resistance does not match the defined type, an adjustment factor can be
configured in tenths of ohms.
Selection Comments Selection Comments Selection Comments
10 PT 10 Ohm Platinum (PT) 100PT3916 100 Ohm Platinum,
α=.003916 100NI 618 100 Ohm NickelAt 0C, DIN43760, α=.00618
25 PT 25 Ohm Platinum IPTS-68 1KPT 375 1 KOhm Platinum,
α=.00375 120NI 672 120 Ohm Nickel, at 0C, α=.00672
25.5PT 392 25.5 Ohm Platinum,
α=.00392 at 0C Lab Std 10CU 10 Ohm Copper, at 25C, IPTS-68 604NI/FE518 604 Ohm Nickel/Iron,at 0C, α=.00518
100PT 385 100 Ohm Platinum,
DIN43760, α=.00385 9.035CU427 9.035 Ohm Copper, at 25C, α=.00427 IKNI/FE527 1KOhmNickel/Iron, at 70F, α=.00527
100PT3902 100 Ohm Platinum,
α=.003902 50CU 427 50 Ohm Copper, α=.00427 500OHM SelectUNITSof1/10Ohms
100 PT 392 100 Ohm Platinum,
α=.00392 IPTS-6 8 100CU427 100 Ohm Copper, α=.00427 3000OHM SelectUNITSof1/10Ohms
100PT3923 98.13 Ohm Platinum,
α=.003923 100NI 100 Ohm Nickel,IPTS-68

RTD Input Module
GFK-1206D
Analog Input Module
6
June 1997
RTD Limits
The table below lists the ohms and temperature limits for different RTD types.
RTDType LowΩ
Limit HighΩ Limit Low Temp. C High Temp. C
10 Ohm Copper @ 25C 6.13600 14.8200 –75.00 150.00
10 Ohm Platinum @ 25C 7.02000 37.2599 –70.00 1000.00
25 Ohm Platinum 4.14500 74.3089 –201.1111 537.77
100 Ohm Nickel 80.88890 147.7700 –40.00 140.00
1 KOhm Platinum, α=.00375 199.4880 2754.620 –200.00 500.00
100 Ohm Platinum α=.00385 27.01 389.936 –180.0 850.0
100 Ohm Platinum, α=.003902 93.5400 135.000 –17.7777 99.9999
100 Ohm Platinum IPTS68 (PA) 26.5 327.744 –200.0 630.0
100OhmPlatinumSAMA-RC21-4(PC) 26.5 311.874 –200.0 600.0
100 Ohm Platinum JISC-1604-’81 26.5 323.780 –200.0 620.0
25.5 Ohm Platinum Lab Std (PJ) 4.50 83.575 –200.0 630.0
9.035 Ohm Copper (CA) 6.05 16.400 –100.0 260.0
50OhmCopper(CB/2) 28.379 105.787 –100.0 260.0
100 Ohm Copper (CB) 56.757 211.574 –100.0 260.0
100 Ohm Nickel (NB) 69.520 223.221 –60.0 180.0
120 Ohm Nickel(NA) 66.600 380.310 –80.0 260.0
604 Ohm Nickel/Iron(FA) 372.789 1318.722 –100.0 204.0
1 KOhm Nickel/Iron(FB) 566.576 1985.891 –100.0 204.0

7
RTD Input Module GFK-1206D
Analog Input Module
June 1997
Module Specifications
ModuleCharacteristics
Numberof Channels Four3-wireand/or4-wireRTDs
Scantime 60 Hz:approximately210millisecondsperpoint
50Hz:approximately230millisecondsperpoint,
Faultdetection Open RTD,inputshort,underrange,overrange,andhigh/lowalarm
Normalmoderejection 60dB,at50/60Hz,100%span
Commonmoderejection 120dBat50/60Hz,100ohmimbalance
Commonmodevoltage 250Vrms (350VDCorpeakAC)
Normalmodevoltage 100%overrangeDC or peak ACoperational
28VDC or peak ACmaximum
Isolation:
Userinputtologic,user input to frame
ground. 1500VAC for 1 minute, 250 VACcontinuous.
Channel to Channel 250VACcontinuous.
CurrentdrawnfromBIUpower supply 190mA maximum
DigitalResolution 15bitsplussign
Operatingtemperaturerange 0 to 55 Degrees C ambient
ChannelCharacteristics
RTDtypes 10,25,100,and1000ohm platinum
10and 100 ohm copper
100,50, and 120 ohmnickel
604ohmsand1000ohmsnickel/iron
Resistanceranges 0 to 500 ohms
0to 3000 ohms
Accuracy, at 25 C RTD: +/–0.15% of reading, +/–0.3 to 0.5 degree Celsius, depending
on type
Temperature sensitivity (0 to 60C) +/–0.004% of reading, +/–1.5µV per C referred to input
Maximumleadresistance 5 ohms perlead
Keying Locations
Optional keying locations for the RTD Module are:
KeyingLocations
A B C D E F G H J K
n n n n

RTD Input Module
GFK-1206D
Analog Input Module
8
June 1997
Field Wiring
The following illustration shows connections for 3-wire and 4-wire RTDs.
3-Wire RTD 4-Wire RTD Corresponding
Terminals
Required for
Calibration if no
RTD is Installed
1
7
2
8
9
15
10
16
Source
In (+)
In (–)
Return
Source
In (+)
In (–)
Return
Source
In (+)
In (–)
Return
46724
5 6 13 14
341112
No loop power is required for this module. The excitation current for the RTDsis provided
by the module, which automatically matches the excitation current to each configured RTD
type.
I/O Terminal Block Terminal Assignments
The Terminal Block with box terminals (IC670CHS002) has 25 terminals for each module. Each
accommodates one AWG #14 (avg 2.1mm2cross section) to AWG #22 (avg 0.36mm2cross
section) wire, or two wires up to AWG #18 (avg. 0.86mm2cross section). When an external
jumper is used, wire capacity is reduced from AWG #14 (2.10mm2) toAWG #16 (1.32mm2).
TheI/OTerminal Block with barrier terminals (IC670CHS001) has 18 terminals per module.
Each terminal can accommodate one or two wires up toAWG #14 (avg 2.1mm2cross section).
TheI/OTerminal Block with Connectors (IC670CHS003) has one 20-pin male connector per
module.
I/O Terminal Block with
Box Terminals
(IC670CHS002 and 102)
I/O Terminal Block with
Barrier Terminals
(IC670CHS001 and 101)
Terminals E1, E2, E4, E6, and E8 are
electrically connected together, A1 and A2
are electrically connected together, B1
andB2 are electrically connected together.
I/O Terminal Block with Wire
to Board Connectors
(IC670CHS003 and 103)
46725
B1
B2
E2
2
4
E4
6
8
E6
10
12
E8
14
16
A1
A2
E1
1
3
5
7
9
11
13
15
notused
notused
notused
notused
notused
Source4
In (+) 4
notused
In (–) 4
Return4
notused
notused
notused
Source1
In (+) 1
In (–) 1
Return1
Source3
In (+) 3
In (–) 3
Return3
B
2
4
6
8
10
12
14
16
A
1
3
5
7
9
11
13
15
notused notused B1
B2
A1
A2
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
Source2
In (+) 2
In (–) 2
Return2
Source4
In (+) 4
In (–) 4
Return4
Source1
In (+) 1
In (–) 1
Return1
Source3
In (+) 3
In (–) 3
Return3
Return2
In (–) 2
In (+) 2
Source2
Return1
Return2
In (–) 1
In (+) 1
In (–) 2
In (+) 2
Source1
Source2
Return3
Return4
Source4
Source3
In (+) 4
In (–) 4
In (–) 3
In (+) 3
notused
notused
notused
notused

9
RTD Input Module GFK-1206D
Analog Input Module
June 1997
Diagnostics
The RTD module performs diagnostics and provides the diagnostic data to the BIU using its
configured discrete input (I) references, starting at the configured reference offset.
The RTD sets the appropriate bit when a diagnostic condition is detected. The bit remains set
until cleared.
76543210
Low alarm for RTD 1
High alarm for RTD 1
Low alarm for RTD 2
High alarm for RTD 2
Low alarm for RTD 3
High alarm for RTD 3
Low alarm for RTD 4
High alarm for RTD 4
Circuit Diagnostics Bits (byte 0)
76543210
Input underrange, RTD 1
Input overrange, RTD 1
Circuit Diagnostics Bits (byte 1)
Input underrange, RTD 2
Input overrange, RTD 2
Input underrange, RTD 3
Input overrange, RTD 3
Input underrange, RTD 4
Input overrange, RTD 4
76543210
Open Wire, RTD 1
Circuit Diagnostics Bits (byte 2)
Open Wire, RTD 2
Open Wire, RTD 3
Open Wire, RTD 4
Shorted input, RTD 1
Shorted input, RTD 2
Shorted input, RTD 3
Shorted input, RTD 4
76543210
Wiringerror, RTD 1
Circuit Diagnostics Bits (byte 3)
Wiringerror, RTD 2
Wiringerror, RTD 3
Wiringerror, RTD 4
spare
spare
spare
spare
Clearing Faults and Alarms
Four optional discrete output bits in the BIU’s discrete output (Q) table can be used to clear
module faults and alarms.
Setting the discrete output bit for an RTD clears all diagnostic bits for that RTD that may be
set.
76543210
ClearAll Faults on RTD 1
ClearAll Faults on RTD 2
ClearAll Faults on RTD 3
ClearAll Faults on RTD 4
not used
not used
not used
not used
Output Command Bits to Clear Diagnostics