Manual

Rockwell Automation Publication 750COM-UM004B-EN-P - September 2012 67
Troubleshooting Chapter 7
MOD Status Indicator
This red/green bicolor LED indicates the status of the option module as shown
in the table below.
NET A Status Indicator
This red/green bicolor LED indicates the status of the Profibus connection to
the 20-750-PBUS option module as shown in the table below.
Status Cause Corrective Action
Off The option module is not powered or
connected properly to the drive.
• Securely connect and ground the option module to
the drive by fully inserting it into the drive port and
tightening its two captive screws to the
recommended torque.
• Apply power to the drive and network.
Flashing Red The option module has failed the firmware
test.
• Cycle power to the drive. Parameter settings may
have been changed.
• Clear faults in the option module.
• If cycling power does not correct the problem, the
option module parameter settings may have been
corrupted. Reset defaults and reconfigure the option
module.
• If resetting defaults does not correct the problem,
update the option module with the latest firmware
revision.
Steady Red The option module has failed the
hardware test.
• Cycle power to the drive.
• Replace the option module.
Flashing Green The option module is operational but is
not transferring I/O data.
• Place the master in RUN mode.
• Configure the option module for the program in the
controller.
• Program the controller to recognize and transmit I/O
to the option module.
• Normal behavior if no I/O is being transferred.
Steady Green The option module is operational and is
transferring I/O data.
No action required.
Status Cause Corrective Actions
Off The option module cannot establish
network communication or has
experienced a Communication Timeout.
• Securely connect the option module to the drive and
connect it to the network using a Profibus cable.
• Correctly connect the Profibus cable to the Profibus
connector.
• Apply power to the drive.
Flashing Red The option module has detected a
Network Configuration Error.
Re-configure the Profibus module.
Steady Red The option module has experienced an
internal network controller error (Profibus
ASIC Self-Test failure).
• Cycle power to the drive.
• Re-configure the Profibus master.
Steady Green The option module is properly connected
and communicating over the Profibus
network.
No action required.