Specifications, Status reported in word 13 – Rockwell Automation 1771-IXE Thermo/MV Input Installation Instructions User Manual
Page 11
Thermocouple/Millivolt Input Module
11
Publication 1771Ć5.49 - October 1996
Status Reported in Word 13
Design your program to monitor status bits in word 13 during
auto–calibration, and to take appropriate action depending on your
requirements. You may also want to monitor these bits while
troubleshooting with your industrial terminal. The module sets a bit
(1) to indicate it has detected one or more of the following conditions
as shown below.
Word
Bit
Condition
13
6
The EEPROM could not be written.
7
Channel(s) could not be calibrated as indicated by bits 10 through 17
respectively.
10-17
Bit 10 (channel 1) through bit 17 (channel 8) could not be calibrated.
Check field wiring arm connections and source for proper voltage.
Number of Inputs
8, all of the same type or 4 each of 2 different types
I/O Chassis Location
Any single I/O module slot
Type of Input (Selectable)
Type E, chromel/constantan
(-270 to 1000
o
C)
Type J, iron/constantan
(-210 to 1200
o
C)
Type K, chromel/alumel
(-270 to 1380
o
C)
Type R, Pt/Pt-13% Rh
(-50 to 1770
o
C)
Type T, copper/constantan
(-270 to 400
o
C)
Type S, Pt/Pt-10% Rh
(-50 to 1770
o
C)
Millivolt
(-100 to +100mV dc)
Thermocouple Linearization
IPTS-68 standard, NBS MN-125
Cold Junction Compensation
Range: 0 to 60
o
C
Accuracy: +0.5
o
C
Temperature Scale (Selectable)
o
C or
o
F
Input Resolution
1
o
C, 1
o
F, or 10uV
Input Isolation
1000V peak between inputs, between input and common, and
between input and backplane connections
Common Mode Rejection
120dB at 60Hz, up to 1000V peak
Common Mode Impedance
Greater than 10 megohms
Normal Mode Rejection
60dB at 60Hz
Input Overvoltage Protection
120V rms, continuous
Open Input Detection
Open input produces a maximum value reading in less than 10
seconds
Input Connections
18-terminal wiring arm (Cat. No. 1771-WI)
Data Format (Selectable)
4-digit BCD
2's complement binary
signed magnitude binary
Calibration
Auto-calibration (offset and gain)
Zero offset and gain adjustment for each channel via programming
terminal
Verify every six months for maintaining absolute accuracy
Processor Compatibility
Any A-B processor using the 1771 I/O structure and block transfer
Specifications continued on next page
Specifications