Power-Up Diagnostics; Channel Diagnostics; Invalid Channel Configuration Detection; Out-Of-Range Detection - Allen-Bradley Compact 1769-IR6 User Manual

Power-up Diagnostics

Channel Diagnostics

At module power-up, a series of internal diagnostic tests are performed.
These diagnostic tests must be successfully completed or the module
status LED remains off and a module error results and is reported to the
controller.
If module status Indicated
LED is: condition:
On Proper Operation
Off Module Fault
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 5-4 to 5-7 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.
There is no under-range error for direct resistance inputs
IMPORTANT
because 0 is a valid number.
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.
AB PLCs
Diagnostics and Troubleshooting
Corrective action:
No action required.
Cycle power. If condition persists, replace the module.
Call your local distributor or Rockwell Automation for
assistance.
Publication 1769-UM005A-EN-P
5-3