Spectrum Controls 1746sc-NI8u - Manual (Page 75)

Testing Your Module
This chapter describes troubleshooting with channel-status and module-
status LEDs. It explains the types of conditions that might cause the
module to flag an error, and suggests what corrective action you could
take. Topics include:
• module and channel diagnostics
• LED indicators
• Interpreting I/O error codes
• troubleshooting flowchart
Module and Channel
Diagnostics The module operates at two levels:
• module level
• channel level
Module level operation includes functions such as power-up, configuration,
and communication with the SLC processor. ON indicates the module is
OK. OFF indicates a fault.
Channel level operation includes functions such as data conversion and
open-circuit detection. ON indicates the channel is OK. Blinking
indicates a fault.
The module performs internal diagnostics at both levels, and immediately
indicates detected error conditions with either of its status LEDs. When a
status LED is continuously ON, the status is OK.
Module Diagnostics at Power-up
At module power-up, the module performs a series of internal diagnostic
tests. If the module detects a failure, its module status LED remains off.
Channel Diagnostics
When a channel is enabled, the module checks for a valid configuration.
Then on each scan of its inputs, the module checks for out-of-range and
open-circuit fault conditions of its inputs including the CJC input.
When the module detects a failure of any channel diagnostic test, it causes
the channel status LED to blink and sets the corresponding channel fault
Chapter 6