Rockwell Automation 1769-IR6 Compact I/O 1769-IR6 RTD/Resistance Input Module - Manual (Page 83)

Rockwell Automation Publication 1769-UM005B-EN-P - March 2012 83
Diagnostics and Troubleshooting Chapter 5
Power-up Diagnostics At module power-up, a series of internal diagnostic tests are performed. These
diagnostic tests must be successfully completed or the module status indicator
remains off and a module error results and is reported to the controller.
Channel Diagnostics When an input channel is enabled, the module performs a diagnostic check to
see that the channel has been properly configured. In addition, the channel is
tested on every scan for configuration errors, over-range and under-range, and
broken input conditions.
Invalid Channel Configuration Detection
Whenever a channel configuration word is improperly defined, the module
reports an error. See pages 84…88 for a description of module errors.
Out-of-Range Detection
When the input signal data received at the channel word is out of the defined
operating range, an over-range or under-range error is indicated in input data
word 7.
Possible causes for an out-of-range condition include:
· The temperature is too hot or too cold for the RTD being used.
· The wrong RTD is being used for the input type selected, or for the
configuration that you have programmed.
· The input device is faulty.
· The signal input from the input device is beyond the scaling range.
Module Status
Indicator Condition Corrective Action
On Proper Operation No action required.
Off Module Fault Cycle power. If condition persists, replace the
module. Call your local distributor or Rockwell
Automation for assistance.
IMPORTANT There is no under-range error for direct resistance inputs
because 0 is a valid number.