Rockwell Automation 1746-NI16V SLC 500 Analog Input Modules User Manual - Manual (Page 72)

Publication 1746-UM001A-US-P
6-2 Module Diagnostics and Troubleshooting
Channel Diagnostics When a channel is enabled (bit 15=1), a diagnostic check is
performed to see that the channel has been properly configured. In
addition, the channel is tested on every scan for configuration errors,
out-of-range errors, and, for the 4 to 20 mA input type, open-circuit
conditions.
A failure of any channel diagnostic test causes the faulted channel
status LED to blink. All channel faults are indicated in bits
15 through 13 of the channel’s status word. Channel faults are
self-clearing. When the fault conditions are corrected, the channel
status LED stops blinking and resume steady illumination.
Invalid Channel Configuration
Whenever a channel’s configuration word is improperly defined, the
channel status LED blinks and the channel status word indicated the
type of configuration error in bits 15 through 13. See “Error Codes” on
page 6-5.
Configuration errors occur when the data format (bits 8 through 6) in
the channel configuration word are invalid.
Out-Of-Range Detection
Whenever the data received at the channel data word is out of the
defined operating range, an over-range or under-range error is
indicated in the channel status word. See “Error Codes” on page 6-5.
ATTENTION
!
If you clear (0) a channel enable bit (15), all channel
status information is reset.