Spectrum Controls 1769sc-IF8u - Manual (Page 69)

Chapter 5: Diagnostics and Troubleshooting 59
If m odule status LED
is: Indicated
condition Corrective action:
On Proper Operation No action required
Of f 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.