Rockwell Automation 1756-RIO ControlLogix Remote I/O Communication Interface Module User Manual - Manual (Page 162)

162 Publication 1756-UM534B-EN-P - November 2010
Appendix D Troubleshooting Display and Status Indicators
Status Indicators The 1756-RIO module has three status indicators to indicate the state of
internal operations. The status indicators are labeled RIO, CLX, and OK.
RIO Status Indicator – Remote Devices Status
The RIO indicator displays the status of the Remote I/O network connection.
Status varies depending on the mode of the module.
Scanner Mode
In order of priority, highest first.
Module Display and Indicators
Indicator Description
1 Module status display
2 RIO status indicator
3 CLX status indicator
4 OK status indicator
Indicator Status Description
RIO Red A frame-receive error has been received in the last
second (CRC error, abort, or time-out). Indicator stays
red for 1 second after the error occurs.
One or more racks are in error.
Flashing red/
off At least one rack being scanned (not inhibited) is in
error. One or more racks are inhibited.
Yellow Idle, no racks are configured.
Flashing
yellow/off All configured racks are inhibited.
Flashing green/
off No racks being scanned (not inhibited) are in error, but
one or more racks are inhibited.
Green Successful communication with all configured racks,
no inhibited racks.
RIO CLX OK
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ADAPTER MOD
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