Rockwell Automation 1771-TCM TEMPERATURE CONTROL - Manual (Page 59)

7–2 Monitoring and Controlling the Loops
Publication 1771Ć6.4.5 - January 1997
The module status pane is used to display error messages. If the
number of current error messages exceeds the number of lines that
can be displayed, you can scroll thru the messages. The possible
error messages include the following:
•
high temperature alarm
•
low temperature alarm
•
high deviation alarm
•
low deviation alarm
•
high manipulated variable (M) alarm
•
low (M) alarm
•
input over range
•
input under range
•
TC break alarm
•
loss of thermal integrity
•
calibration fault
•
CJ under range
•
CJ over range
•
Auto-tuning terminated because of thermal integrity loss.
•
Auto-tuning terminated because of thermocouple break.
•
Heat auto-tuning inhibited because of starting conditions.
•
Cool auto-tuning inhibited because of starting conditions.
•
Set point will be reached before auto-tuning is complete.
•
Too much noise causing time constant to be 0.
•
Very small gain.
•
Set point exceeded before auto-tuning completed.
You may also see a message that says there is an error in a specific
word of the configuration block, the gains block, or the dynamic
block. In that case, refer to the user manual (publication
1771-6.5.120) to resolve the problem. This kind of problem would
most likely be a result of ladder logic errors such as writing over the
data-table interface area.