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SERIES SIX
PROGRAMMABLE
GEK-84867
CONTROLLERS
Types:
J, K I-, S, T, B, E, R
THERMOCOUPLE INPUT MODULES
GENERAL DESCRIPTION
The Thermocouple Input modules provide eight,
eiectrically-isolated inputs for the detection of low-level,
analog signals developed by thermocouple devices. These
modules are available in seven versions: Type J, Type
K+, Type S, Type T, Type B, Type E, and Type R. The
features and benefits of the Thermocouple Input modules
are summarized in Table 1.
The modules contain two, four-channel, thermocouple
conditioners; either four-channel conditioner can be
reassigned for use with any of the seven thermocouple
types (J, K+, S, T, B, E, or R). The low-level input signal
conditioning includes f 1OOOV DC, isolation, high
common mode rejection, filtering and low drift amplification. Signal integrity is further preserved by a highaccuracy programmable-gain amplifier and a 13-bit integrating A/D converter.
renheit. The temperature value is sent, along with binary
information giving various status conditions and the channel number, to the Input Status Table in the Series Six
CPU. Temperature values transferred to the Series Six
CPU can be in either sign magnitude or 2’s complement
format, as jumper-selected by the user.
The input channels are sampled at a rate of 15 or 30 readings per second (for 60 Hz settings). The factory-set
sample rate of 15 samples per second gives a Normal
Mode Rejection (NMR) of 86 dB for each input. (NMR
indicates immunity to power-line frequency noise added
to the low-level input signals.) Where NMR is of lesser
importance, the sample rate can be doubled, to 30 samples
per second.
The output of this converter constitutes a 13-bit word (12
bits plus sign) equivalent to k 4096 counts of resolution.
An external Cold-Junction Compensation element,
which connects directly to the terminals on the module
faceplate, eliminates the need for an ice-point reference
function.
An on-board microprocessor then scales, linearizes and
converts the input data to either degrees centigrade or fah-
Refer to Figure 1 (next page) for Thermocouple Input
module specifications.
TABLE 1.
FEATURES AND BENEFlTS
FEATURES
Seven types available:
Type
J Thermocouple
Type K Thermocouple
Type S Thermocouple
Type
T Thermocouple
BENEFITS
Useful in variety of applications
Type B Thermocouple
Type E Thermocouple
Type R Thermocouple
Eight isolated inputs per module
Low cost per input point
Contains cold-junction compensation and linearization
routines
Direct interface to thermocouple devices
Thirteen-bit
High conversion accuracy (1 part in 8192)
resolution
Temperature readings in degrees C or F
Ease of operation
Open thermocouple detection
Simplifies
troubleshooting
APPLICATIONS
* Injection Molding
* Chemical Processing
* Annealing Furnaces
GEK-84867
Thermocouple Input Modules
Power Requirements:
5V DC, 1.7 A maximum
(Supplied by l/O Rack power supply)
Resolution:
13 bits ( * 4096)
Input to Series Six Isolation 1OOOV peak AC or DC
Low Pass Filter; High Noise Rejection
Input Requirements:
J:
-4.632 to +42.922 MV
F+: -3.553 to +54.845 MV
.
+2.323 to + 18.698 MV
T’: -5.603 to +20.869 MV
B:
+2.782 to + 13.814 MV
E: -8.824 to +76.358 MV
R:
0.000 to +21.105 MV
Operating Temperature: 0” to 60°C (32” to 140°F)
(at outside of rack)
Storage Temperature:
-20” to +8O”C
(-4” to + 176°F)
Humidity: 5% - 95% (non-condensing)
Normal Mode Rejection:
86 dB at line frequencies:
@ 15 sample/sec;
@ 12.5 sample/sec.
Thermocouple Temperature Range and Module Accuracy*
Type
J
K+
;
B
E
R
*NOTE:
“C
-100 to 760°C * 1.3”
-0 to 1371°C f 1.4”
300 to 1768°C f 3.5”
-200 to 400°C f 1.3”
750 to 1820°C zt3.0”
-200 to 1ooo”c zt3.0”
0 to 1768°C k4.2”
“F
-148 to 1400°F f 2.34”
+32 to 2500°F f 2.52”
572 to 3214°F f 6.3”
-328 to 752°F f 2.34”
1382 to 3308 f 5.4”
-328 to 1832 f 5.4”
32 to 3214 f 7.5”
Total accuracy should also include accuracy of thermocouple wire. typically, f 1 or 2 “C or 0.75%, whichever is
greater.
Module Drift*
(Allow 15 minutes of operation for specified accuracy)
Type
J
IC+
s
T
B
E
R
Temp. Drift
Time Drift
f .l”C/“C
f .3”C/“C
f .3”C/“C
f. 1 “C/“C
f .3”C/“C
f .3”C/“C
f .3”C/“C
& .lO”C/Month
f. 1 S”C/Month
* .1 S”C/Month
f . 1 OWMonth
=t . ISWMonth
2 . I SOWMonth
f .15”C/Month
‘NOTE: These specifications describe worst case variations in accuracy of Thermocouple Input module temperature readings (established at time and temperature of calibration) resulting from changes in ambient temperature per degrees centigrade and progression of time in months.
FIGURE 1. SPECIFICATIONS
2
GEK-84867
Thermocouple Input Modules
DATA FORMAT
The Thermocouple Module requires four consecutive,
8-bit, input address bytes to transfer data to the CPU.
Data from a single T/C Input Channel is transferred with
every I/O scan. The module automatically indexes to the
next channel after it is read. This action is independent of
the input sampling rate. (The Series Six CPU can strobe
this module every 80 usec for up to 8 scans. It then must
allow the module to return to its data sampling routine for
20 usec before reading the input points again.) The 32 bits
that constitute the input address bytes are described
below. Ail 32 bits are displayed in the Input Status Table.
Bits 1-8:
Channel Number: 8-bit binary number giving
the number of the channel (0 - 7) being read.
It consists of three significant bits (bits l-3)
and five leading zeroes (bits 4-8).
Bit 14:
Bit 9:
Valid Data: HIGH if the data is valid, LOW if
the data is invalid. (Invalid data could indicate: ambient temperature at Cold Junction
Compensation module is less than 0°C or
greater than 60°C; or data in process of being
updated when I/O request occurs.)
Bit 10:
(Unused)
Bit 11:
Open Thermocouple: (Synchronous with
channel number.)
Bit 12:
Sign of data bit. (Sign Plus Magnitude only).
Bit 13:
Board OK: HIGH if OK light is on. LOW if
OK light is off. (Refer to Figure 2, User Item,
No. 7).
TABLE 3.
SIGN
2 7 26125
Z’s COMP
SIGN BITS
.= 1
+ 5 0
D D D
A A A
T T T
3R
SIGN PLUS
MAG =
ALL ZEROS
Type J <
Type K+ <
Type S <
Type T <
Overrange: HIGH if input level is at or above
the high end of the module range; LOW otherwise. Refer to Figure 1 for overrange
values.
Bit 16:
Heartbeat: Changes state each time card is
read.
STATUS
CHANNEL NUMBER
24
zi-
ii
-
11 10
T--
ii-
a
-
D
D
D
0 N
P 0
E T
N
U
T S
H E
E D
R
M
0
C
0
U
P
L
E
V
Z
Z
Fi
0
E
R R
0 0
:
A
3 B B
I 1 I
T T T
B
I
T
B
I
T
6
I
T
11
8
6
1
10 9
Bit 15:
INPUT STATUS TABLE
T”
A
A
Type B < +4I0
Type E < -454
Type R -< -58
Bits 29-32: These four bits function as sign extension for
2’s sign plus format; they are zeros (four) in
2’s complement format.
T”
A
A
-346
-350
+32
-454
Bits 17-28: Data: The 12 bits of temperature data. Bit No.
17 is the least significant bit (LSB) .
TEMPERATURE
j21
Underrange: HIGH if input level is at or
below the low end of the module range;
LOW otherwise. The underrange values are
in “F:
-
A
-
I
c
I
D
D
A
T
A
r
ZE
2”
- 7
-
-i-
Z
E
R
0
C
H
A
N
N
E
L
C
N
U
N
u
M
B
E
R
r
E
R
- - - -
M
s
B
- -
H
A
Iv
N
E
L
L
s
B
-
GEK-84867
Thermocouple Input Modules
CALIBRATION
Required
PROCEDURE
For each channel (l-8) adjust the offset potentiometer, then the gain potentiometer, as follows:
equipment:
Voltmeter 4 digit
Voltage source - resolution to 1 mv.
Calibration connector (IC600MA508A)
a. Connect the (+) lead of the voltmeter to TPl and
the (-) lead of the voltmeter to TP3.
b. Connect the (+) and (-) leads of the voltage
source to the (+) and (-) inputs, respectively, of
the channel to be calibrated.
Calibration of the Thermocouple Module should be performed every six months. For maximum accuracy the
card should be calibrated at the normal ambient temperature which occurs in operation. Allow the thermocouple
card to warm up for one hour before calibration.
I.
2.
3.
c. Set the voltage source to 0.000 volts.
Adjust the appropriate offset potentiometer to
obtain a reading of 0.000 volts on the voltmeter.
Loosen the thumbscrews and remove the faceplate,
taking case not to disturb the field wiring. Move the
RUN/CAL jumper to the calibrate position (2 to 3).
Refer to Figure 2, User Item No. 13. Place the calibration connector (P/N IC600MA508A) on the thermocouple board.
If the thermocouple card is type J or K, set the voltage source to 0.050 volts; if the card is type S, T,
B, or R, set the voltage source to 0.025 volts; if the
card is type E or K+, set the voltage source to
0.100 volts.
A/D Reference trim, (Refer to Figure 4, right side.)
Place the (+) lead of the voltmeter on TP2 and the
(-) lead on TP3. Adjust the A/D reference potentiometer to obtain a voltmeter reading of 2.048 volts.
Adjust the appropriate gain potentiometer to
obtain a reading of 4.000 volts on the voltmeter.
Offset trim. In Figure 4, the offset adjustment potentiometers for channels 1 to 8 are labeled Offset 1 to
Offset 8, respectively.
4. Remove the calibration connector. Place the
RUN/CAL jumper in the run position (I to 2). Refer
to Figure 2, User Item No. 13. Replace the faceplate,
taking case not to disturb field wiring.
Gain trim. In Figure 4, the gain adjustment potemtiometers for channels 1 to 8 are labeled Gain 1 to
Gain 8, respectively.
5.
Mark the calibration date on the faceplate lens in the
space provided.
ORDERING INFORMATION *
Module
Type J
Type K+
Type S
Type T
Type B
Type E
Type R
Circuit Board and Faceplate
Circuit Board Only
IC600BF813A
IC600BF814A
IC600BF815A
IC600BF816A
IC600BF817A
IC600BF818A
IC600BF819A
IC600YB813B
IC600YB814B
IC600YB815B
IC600YB816B
IC600YB817A
IC600Y08~8A
IC600YB819A
Faceplate
*IC600FP813A
*IC600FP813A
*IC600FP813A
‘IC600FP813A
* IC6OOFP813A
*IC600FP813A
‘IC600FP813A
Calibration Connector
IC600MA508A
Cold Junction Compensation Element is included with the faceplate assembly IC600FP813A.
CATALOG NUMBER REVISION SUFFIX
The equipment listed above having the catalog numbers shown and the same equipment having a higher alpha suffix is designed for listing by UL for use as auxiliary control devices. The equipment is a direct replacement for equipment having the
same catalog number but a lower alpha suffix.
The UL symbol on the nameplate means the product is listed by Underwriters Laboratories Inc. (UL Standard No. 508, Industrial
Control Equipment, subsection Electronic Power Conversion Equipment.)
For further information, contact your local GE Fanuc sales office.
GE Fanuc Automation North America, Inc., Charlottesville, Virginia
OCTOBER,
1985
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