Publication 2711-UM014B-EN-P
Troubleshooting and Maintenance 13-5
Remote I/O LED Indications
1 Comm LED stays on until powerup self-test are complete
DeviceNet, ControlNet, EtherNet/IP
LED This pattern: Indicates:
Comm
1
Solid Fill Normal operating state (no communication faults)
No Fill Communications not functioning
• Verify that baud rate and rack settings match
the PLC settings
• Verify proper terminal to controller
connections
• Verify that the PLC enables Remote I/O
communications
Blinking No communications established. PLC is in program
mode.
Flashing When power is first applied (momentarily)
Fault No Fill Normal operating state
Solid Fill Fault detected. Cycle power to the terminal. If the fault
still exists, the terminal requires servicing.
Blinking Hardware is functioning but no application is loaded or
the current application is corrupt.
LED This Pattern: Indicates:
Comm
Solid Fill Normal operating state (no communication faults).
No Fill Hardware failed.
Flashing When power is first applied (momentarily).
Blinking No communications established.
Fault
Solid Fill Normal operating state (no communication faults).
No Fill Hardware failed.
Blinking Hardware is functioning but no application is loaded or
the current application is corrupt.
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