Rockwell Automation 1734-485ASC POINT I/O ASCII User Manual - Manual (Page 56)

Publication 1734-UM009B-EN-P - July 2003
3-2 Diagnostics
Table 3.2 Network Status Indicators
Indication Probable Cause
Network Status
Off Device is not on-line.
- Device has not completed dup_MAC_id test.
- Device not powered - check module status indicator.
Flashing Green Device is on-line but is not allocated to a master.
Green Device on-line and has connections in the established
state.
Flashing Red One or more I/O connections in timed-out state.
Red Critical link failure - failed communication device. Device
detected error that prevents it communicating on the
network.
Table 3.3 Transmit/Receive Indicators
Indication Probable Cause
Transmit/Receive Status
Flashing Transmit/
Off Receive Check wiring, ground, and RX connection. User parameter
object to view transaction IDs.
Flashing Receive/
Off Transmit Check wiring. Watch TX light. If it does not flash, check
that you are properly initiating transmission. Use EDS
parameter object to try transmitting and watch the light.
If it flashes, you are not properly initiating transmission
via I/O messaging. If it does flash, check the remote
device.
Off Transmit/
Green Receive Check connections as you may have wired the device
backwards.