Page 1
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
sales@cimtecautomation.com
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10
Analog Input Module
IC670ALG620
GFK-1206D
June 1997
R TD Input Module
RTD Input Module (IC670ALG620)
datasheet GFK-1206D
The RTD Analog Input Module (IC670ALG620) accepts inputs from 4 independent 3-wire
and/or 4-wire platinum, nickel, nickel/iron, or copper RTDs.
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
Reports high/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
SLOT
46722
1234
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
Page 3
2
Analog Input Module
GFK-1206D
June 1997
Module Operation
R TD Input Module
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-coupled multiplexer.
Three measurements are made for each input: Excitation current, RTD resistance including
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.
2.5V
Excitation
Current
+5 V
–5 V
DC/DC
5V
Regulator
6.5V
Signal
Conditioning
and
Multiplexer
A/D
2.5V
Reference
FLASH
Logic
Opto
Micro–
processor
Serial Bus
46723
Calibration
The module automatically performs A/D calibration at powerup. Automatic calibration 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.
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Analog Input Module
3
R TD Input Module
Host Interface
The RTD Input module has the following data types:
H
H
H
H
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 ex changes 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.
GFK-1206D
June 1997
4 analog inputs (4 words)
32 bits of discrete input data for module and channel status (use of this data is optional)
8 bits of discrete output data for fault clearing to the module (also optional)
Analog output data defaults to a length of 0, and should NOT be used for most
applications.
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’s Manual.
Units Selected Integer Ranges Engineering Units
Ranges
Tenths of Degrees –32767 to +32767 –3276.7 to +3276.7
Tenths of Ohms 0 to 65535 0 Ohms to 6553.5 Ohms
Compatibility
This module must be used with a Bus Interface Unit revision 2.0 or later.
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Analog Input Module
GFK-1206D
June 1997
Module Configuration Overview
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
P arameter
Analog Input
Data Length
Analog Input
Data Reference
Discrete Input
Data Length
Discrete Input
Data Reference
Discrete
Output Data
Length
Discete Output
Data Reference
Analog Output
Data Length
Analog Output
Data Reference
Line Frequency Specifies the line frequency . 60 Hz 50 Hz, 60 Hz
Channel Active Specifies if the channel should return data
Units The conversion type for each R TD. Deg C tenths of ohms, tenths of degrees C, or
RTD Type The type of RTD used for each channel. 100 PT
Wire Type The type of field wiring for each RTD. 3 Wire 3 Wire, 4 Wire
Alar m Low The low alarm limit for the channel, in
Alar m High The high alarm limit for the channel, in
Resistance An optional resistance adjustment, in tenths
Wor d length of the module’s anal og inp ut
data in the BIU’s anal og input (A I ) data table.
Starting offset for the module’s analog input
data in the BIU’s analog input (AI) table.
Bit length for the module’s optional status
data in the BIU’s discrete input (I) table.
Starting offset for the module’s status data
in the BIU’s discrete input (I) table.
Bit length for the module’s optional
fault-clearing bits in the BIU’s discrete
output (Q) table.
Starting offset for the module’s optional
fault-clearing bits in the BIU’s discete
output table.
W ord length for analog output data in the
BIU’s analog output (AQ) table. Should not
be used for most applications.
Starting offset for the module’s analog
output data in the BIU’s AQ table.
and alarms. If a channel is “inactive” space
is still allocated for it.
engineering units.
engineering units.
of ohms.
Description Default Choices
R TD Input Module
4 0–4
user selectable
32 0–32
user selectable
8 0–8
user selectable
0 0–4
user selectable
A ctive Inactive (off), Active (on)
tenths of degrees F
10 PT, 25 PT , 25.5 PT 392, 100 PT 385, 100 PT
385
–200 –32,768 to +32,767
800 –32,768 to +32,767
0 0 to 3276.7
3902, 100 PT 392, 100 PT 3923, 100 PT 3916,
1K PT 375, 10 CU, 10 CU 427, 50 CU 427, 100
CU 427, 100 NI, 100 NI 618, 120 NI 672 604
NI/FE 518, 1K NI/FE 527, 500 Ohm, 3000
Ohm
Page 6
Analog Input Module
5
R TD Input Module
Module Features
Channel Active
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.
GFK-1206D
June 1997
A larm 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) 100 PT 3916 100 Ohm Platinum,
25 PT 25 Ohm Platinum IPTS-68 1K PT 375 1 KOhm Platinum,
25.5 PT 392 25.5 Ohm Platinum,
α=.00392 at 0C Lab Std
100 PT 385 100 Ohm Platinum,
DIN43760, α=.00385
100 PT 3902 100 Ohm Platinum,
α=.003902
100 PT 392 100 Ohm Platinum,
α=.00392 IPTS-6 8
100 PT 3923 98.13 Ohm Platinum,
α=.003923
10 CU 10 Ohm Copper, at 25C,
9.035 CU 427 9.035 Ohm Copper , at
50 CU 427 50 Ohm Copper ,
100 CU 427 100 Ohm Copper ,
100 NI 100 Ohm Nickel, IPTS-68
α=.003916
α=.00375
IPTS-68
25C, α=.00427
α=.00427
α=.00427
100 NI 618 100 Ohm Nickel A t 0C,
DIN43760, α=.00618
120 NI 672 120 Ohm Nickel, at 0C,
α=.00672
604 NI/FE 518 604 Ohm Nickel/Iron, at
0C, α=.00518
IK NI/FE 527 1 KOhm Nickel/Iron, at 70F,
α=.00527
500 OHM Select UNITS of 1/10 Ohms
3000 OHM Select UNITS of 1/10 Ohms
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Analog Input Module
GFK-1206D
June 1997
R TD Input Module
RTD Limits
The table below lists the ohms and temperature limits for different RTD types.
RTD Type Low Ω
Limit
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 (P A) 26.5 327.744 –200.0 630.0
100 Ohm Platinum SAMA-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
50 Ohm Copper (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
High Ω
Limit
Low
Temp. C
Temp. C
High
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Analog Input Module
7
R TD Input Module
Module Specifications
Module Characteristics
Number of Channels Four 3-wire and/or 4-wire RTDs
Scan time 60 Hz: approximately 210 milliseconds per point
Fault detection Open RTD, input short, underrange, overrange, and high/low alarm
Normal mode rejection 60dB, at 50/60 Hz, 100% span
Common mode rejection 120 dB at 50/60Hz, 100 ohm imbalance
Common mode voltage 250 Vrms (350 VDC or peak AC)
Normal mode voltage 100% overrange DC or peak AC operational
Isolation:
User input to logic, user input to frame
ground.
Channel to Channel 250 V A C continuous.
Current drawn from BIU power supply 190 mA maximum
Digital Resolution 15 bits plus sign
Operating temperature range 0 to 55 Degrees C ambient
GFK-1206D
June 1997
50 Hz: approximately 230 milliseconds per point,
28 VDC or peak AC maximum
1500 VAC for 1 minute, 250 V AC continuous.
Channel Characteristics
RTD types 10, 25, 100, and 1000 ohm platinum
10 and 100 ohm copper
100, 50, and 120 ohm nickel
604 ohms and 1000 ohms nickel/iron
Resistance ranges 0 to 500 ohms
0 to 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
Maximum lead resistance 5 ohms per lead
Keying Locations
Optional keying locations for the RTD Module are:
K eying Locations
A B C D E F G H J K
n n n n
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8
Analog Input Module
GFK-1206D
June 1997
Field Wiring
R TD Input Module
The following illustration shows connections for 3-wire and 4-wire RTDs.
Required for
3-Wire RTD
Source
In (+)
In (–)
Return
4-Wire RTD
Source
In (+)
In (–)
Return
Calibration if no
RTD is Installed
Source
In (+)
In (–)
Return
Corresponding
T erminals
16
5 6 13 14
341112
172891510
46724
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.
I/O Terminal Block Terminal Assignments
The Terminal Block with box terminals (IC670CHS002) has 25 terminals for each module. Each
accomm o d a t es o n e AWG #14 (avg 2. 1 m m2 cross section) to AWG #22 (avg 0.36mm2 cross
section) wire, or two wires up to AWG #18 (avg. 0.86mm2 cross section). When an external
jumper is used, wire capacity is reduced from AWG #14 (2.10mm2) to A WG #16 (1.32 mm2).
The I/O Terminal Block with barrier terminals (IC670CHS001) has 18 terminals per module.
Each terminal can accommodate one or two wires up to AWG #14 (avg 2.1 mm2 cross section).
The I/O Terminal Block with Connectors (IC670CHS003) has one 20-pin male connector per
module.
I/O Terminal Block with
Box Terminals
(IC670CHS002 and 102)
Source 4
In (+) 4
not used
In (–) 4
Return 4
not used
Source 2
In (+) 2
not used
In (–) 2
Return 2
not used
not used
not used
Terminals E1, E2, E4, E6, and E8 are
electrically connected together, A1 and A2
are electrically connected together, B1
andB2 are electrically connected together.
16
14
E8
12
10
E6
E4
E2
B2
B1
Source 3
15
13
In (+) 3
In (–) 3
11
Return 3
9
8
6
4
2
E1
A2
A1
7
5
3
1
Source 1
In (+) 1
In (–) 1
Return 1
not used
not used
not used
I/O T erminal Block with
Barrier T erminals
(IC670CHS001 and 101)
Source 4
In (+) 4
In (–) 4
Return 4
Source 2
In (+) 2
In (–) 2
Return 2
not used
16
14
12
10
15
Source 3
In (+) 3
13
In (–) 3
11
Return 3
9
8
7
5
3
1
A
Source 1
In (+) 1
In (–) 1
Return 1
not used
6
4
2
B
I/O T erminal Block with Wire
to Board Connectors
(IC670CHS003 and 103)
In (–) 3
In (–) 4
In (+) 3
In (+) 4
Source 3
Source 4
not used
not used
not used
not used
11
10
12
13
14
15
16
A2
A1
B2
B1
Return 4
Return 3
9
8
Source 2
7
Source 1
In (+) 2
6
5
In (+) 1
In (–) 2
4
3
In (–) 1
2
Return 2
Return 1
1
46725
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Analog Input Module
9
R TD Input Module
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.
Circuit Diagnostics Bits (byte 0)
76543210
Circuit Diagnostics Bits (byte 1)
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
Input underrange, RTD 1
Input overrange, RTD 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
GFK-1206D
June 1997
Circuit Diagnostics Bits (byte 2)
76543210
Open Wire, RTD 1
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
Circuit Diagnostics Bits (byte 3)
76543210
Wiring error, RTD 1
Wiring error, RTD 2
Wiring error, RTD 3
Wiring error, RTD 4
spare
spare
spare
spare
Clearing Faults and Alarms
Four optional discrete output bits in the BIU’s discrete out put (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.
Output Command Bits to Clear Diagnostics
76543210
Clear All Faults on RTD 1
Clear All Faults on RTD 2
Clear All Faults on RTD 3
Clear All Faults on RTD 4
not used
not used
not used
not used
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