Rockwell Automation 198x Modular DeviceNet Starter Auxiliary I/O - Manual (Page 143)

DeviceNet Information A-3
Publication 198-UM001B-EN-P September 2001
5. Performs power-up initialization. If the initialization fails, the 198-DN enters the
Error Mode and the Mod/Net Status LED turns solid red.
6. Performs autobaud rate identification (if enabled). If the unit is in the autobaud
algorithm waiting to detect the network baud rate, the unit continues to flash green
then red.
7. Performs a duplicate node address check to verify that another node is not assigned
the same DeviceNet address as the 198-DN module. If a duplicate node error occurs,
the 198-DN enters the Error Mode, and the Mod/Net Status LED will turn solid red.
8. If power-up reset is successful, the 198-DN enters the Run Mode and the Mod/Net
Status LED flashes green.
Run Mode
In Run Mode, the 198-DN operates as a slave device to a master device. When in run mode,
the Mod/Net Status LED blinks green if there are no network connections established with a
network master. When one or more connections are established, the Communication Status
LED will turn solid green. In run mode, the MDSA DeviceNet Control Module will:
• Accept messages from a master on the DeviceNet network.
• Send response messages and COS messages to a master.
• Gather data from all I/O modules.
• If a DeviceNet bus error is detected, the module enters Error Mode.
• If an I/O error or communication error is detected when gathering data from the
I/O modules, the control module enters the I/O Error Mode.
Error Mode
In Error Mode, the Mod/Net Status LED turns red, or in the case of a minor fault, will flash
red. For full definition of LED conditions, refer to Mod/Net Status LED in Chapter 5. The
198-DN will monitor the error type to determine correct operation. Error types are defined
as either critical or non-critical, and are summarized below. In Error mode, the outputs will go
to the state specified by fault action as defined in the discrete output object.