Rockwell Automation 1771-IXE/D Thermocouple/Millivolt Input Module User Manual - Manual (Page 53)

7–3 Troubleshooting
Publication 1771Ć6.5.130 Ć May 1999
Word Explanation Bit
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. Refer to Table 7.C.
Table 7.C
Status Reported in Words 2 and 3
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.