Rockwell Automation 1746-NI16V SLC 500 Analog Input Modules User Manual - Manual (Page 71)

1 Publication 1746-UM001A-US-P
Chapter
6
Module Diagnostics and Troubleshooting
This chapter describes troubleshooting using the channel status LEDs
as well as the module status LED. It explains the types of conditions
that might cause an error to be reported and gives suggestions on
how to resolve the problem. Major topics include:
•
module operation vs. channel operation
•
power-up diagnostics
•
channel diagnostics
•
LED indicators
•
channel status error codes
•
troubleshooting flowchart
•
replacement parts
•
contacting Allen-Bradley
Module operation vs.
Channel Operation The module performs operations at two levels:
•
module-level operations
•
channel-level operations
Module-level operations include functions such as power-up
configuration and communication with the SLC 500 processor.
Channel-level operations describe channel-related functions, such as
data conversion and open-circuit detection.
Internal diagnostics are performed at both levels of operation, and any
error conditions detected are immediately indicated by the module’s
LEDs.
Power-Up Diagnostics At module power-up, a series of internal diagnostic tests are
performed. These diagnostic tests must be completed successfully or a
module error results and the module status LED remains off.