Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 104)

Publication 1746-UM008B-EN-P - December 2006
104 Module Diagnostics and Troubleshooting
Possible causes of an out-of-range condition include the following:
• The temperature is too hot or too cold for the RTD unit being
used.
• Wrong RTD unit used for type/configuration selected.
• Bad potentiometer or RTD unit.
• Signal input from either potentiometer or RTD unit is beyond
the user-set scaling range.
Module Status LED Indicator (Green)
The module status LED indicator is used to indicate module-related
diagnostic or operating errors. These non-recoverable errors may be
detected when you apply power or during module operation. Once in
a module error state, the RTD module no longer communicates with
the SLC processor. Channels are disabled and data words are
cleared (0).
Failure of any diagnostic test places the module in a non-recoverable
state. To exit this state, cycle power. If the power cycle does not work,
then call your local distributor or Rockwell Automation for assistance.