User Manual

Chapter 5: Diagnostics and Troubleshooting 59
If module status LED
is:
Indicated
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
Spectrum Controls
for assistance.
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 open-circuit conditions.
Invalid Channel Configuration Detection
Whenever a channel configuration word is improperly defined, the module
reports an error. See table 5.3 for a description of module errors.
Over- or Under-Range Detection
Whenever the 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 9. Possible causes of an out-of-range condition include:
• The temperature is too hot or too cold for the type of thermocouple or
RTD being used.
• The wrong thermocouple or RTD is being used for the input type
selected, or for the configuration that was programmed.
• The input device is faulty.
• The signal input from the input device is beyond the scaling range.