Rockwell Automation 160 DEVICENET (DN1) MODULE FRN 1-2.XX - Manual (Page 25)

Publication 0160-5.5 - September 1997
4-2 Modes of Operation
Modes of Operation (Continued) Power-up Reset Mode (Continued)
If the power up or reset sequence fails, the COMM LED will go to
solid red and the module will enter the Error Mode. See the Error
Mode description in this section.
Run Mode
After a successful power-up or reset, the Communication Module
enters the run mode and operates as a slave device to a master device.
In run mode, the Communication Module:
• Accepts messages from the master on the DeviceNet network.
• Monitors DeviceNet incoming power.
If an error is detected, the module enters error mode. See the Error
Mode description below.
Error Mode
If the Communication Module detects an error, the COMM LED is
affected. Errors are critical or noncritical, and are summarized below
See the troubleshooting chart in Chapter 7 for details on how to
recover from an error.
Table 4: COMM LED State During Power-up Reset Mode
COMM LED State Description
Flashes Green 1/4 sec-
ond, Red 1/4 second,
then goes blank
Occurs when power is applied to module.
Blank Power-up initialization is taking place.
Solid Red Indicates failed initialization or duplicate node address.
Solid Green DeviceNet module is in the Run mode.
Table 5: COMM LED State During Error Mode
Error Type Description COMM LED State
Critical
(Not Recoverable)
Power-up initialization failure.
Solid Red Duplicate node address detected.
Incorrect baud rate.
Non-Critical
(Recoverable)
I/O connection timed out. Flashing Red
Non-Critical
(Recoverable)
DeviceNet power lost. Off