Status reported in word 1, Status reported in words 2 and 3 – Rockwell Automation 1771-IXE Installation Instructions User Manual
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Thermocouple/Millivolt Input Module
10
Publication 1771Ć5.64 - October 1998
Status Reported in Word 1
Design your program to monitor status bits in the lower byte of word
1, and to take appropriate action depending on your application
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:
Word
Bit
Explanation
1
00
Module is powered but has not received its first (configuration) block transfer. The green LED is flashing.
01
One or more inputs are out of the range for which you configured the module.
02
Module updated its inputs before the processor read them. The RTSinterval timed out before the processor
read the data.
03
Not used
04
The module's ambient temperature is below 0
o
C. Temperature readings will be inaccurate.
05
The module's ambient temperature is above 60
o
C. Temperature readings will be inaccurate.
06
Not used
07
EEPROM calibration constants could not be read. The module will continue to operate but readings may be
inaccurate.
10-17 Sign bits for each channel
Status Reported in Words 2 and 3
Design your program to monitor over/under range bits, and to take
appropriate action depending on your application requirements. You
may also want to monitor these bits while troubleshooting with your
industrial terminal.
Bits 00–07 and 10–17 each represent an input for channels 1–8,
respectively. For example, bit 04 represents input channel 5. The
module sets a bit (1) to indicate it has detected an out of range
condition.
Word
Bit
Condition
2
00-07 Inputs underrange. Bit 00 is channel 1, bit 07 is channel 8. If input
connections and voltages are correct, this status may indicate failed channel
communications with the microprocessor. If all channels are underrange, this
indicates a possible dc/dc converter failure or a blown fuse.
10-17 Inputs overrange. Bit 10 is channel 1, bit 17 is channel 8. If input
connections and voltages are correct, this status may indicate a failed
thermocouple functional analog block (TC FAB).
3
00-07 Corresponding channel input value is below the alarm value that you
entered for that channel.
10-17 Corresponding channel input value has exceeded the alarm value that you
entered for that channel.