Rockwell Automation 1746-NI16V SLC 500 Analog Input Modules User Manual - Manual (Page 75)

Publication 1746-UM001A-US-P
Module Diagnostics and Troubleshooting 6-5
Channel Status LEDs (Green)
The channel status LED is used to indicate channel status and related
error information contained in the channel status word. A solid green
channel status LED indicates normal operation. The channel status LED
blinks to indicate error conditions such as:
•
channel-related configuration errors
•
open-circuit errors
•
out-of-range errors
All channel errors are recoverable errors and after corrective action,
normal operation resumes.
Error Codes Bits 15 through 13 of the channel status word indicate error conditions
as described in the table below.
Error Condition Description Bit 15 Bit 14 Bit 13
Channel Disabled The channel is disabled. 0 0 0
Faulty Calibration The calibration process was not executed properly. The correct sequence is: (1)
the calibration mode must be entered; (2) zero values must be calibrated; and
(3) full-scale values are calibrated. See Appendix D for more detailed
information on the calibration procedure. 0 0 1
Invalid Calibration
Reference A value outside the expected calibration range was applied to the channel for
either the zero or full-scale calibration range. See Appendix D for more
information on calibration value ranges. 0 1 0
Configuration Error An illegal bit pattern was entered in the configuration word (bits 8 through 6).
The configuration error bits are cleared when the channel is disabled. 0 1 1
Open-Circuit Detected The channel has detected an open circuit at its input. The open-circuit state
always takes precedence over the out-of-range error states. There will never
be an out-of-range error when an open circuit is detected. The open-circuit
error bits are cleared when the channel is disabled or when the open-circuit
condition is removed. 1 0 0
Under-Range Detected The configured channel has detected an under-range of the data on an input
channel. The channel data value is set to the lowest defined value for an
under-range condition, based on the selected input type’s signal range. The
under-range bits are cleared when the channel is disabled. 1 0 1
Over-Range Detected The configured channel has detected an over-range of the data on an input
channel. The channel data value is set to the highest defined value for an
over-range condition, based on the selected input type’s signal range. The
over-range bits are cleared when the channel is disabled. 1 1 0
No Error The channel is operating without any errors. 1 1 1