Publication 1785-UM012D-EN-P - July 2005
F-6 Troubleshooting
Ethernet Transmit LED
The PLC-5 Ethernet interface contains an Ethernet Transmit LED that lights
(green) briefly when the Ethernet port is transmitting a packet. It does not
indicate whether or not the Ethernet port is receiving a packet.
Remote I/O System
Troubleshooting Guide for the 1771-ASB Series C and D
Adapter Module
BATT
PROC
FORCE
COMM
PROG
RUN
R
E
M
ENET
TRANSMIT
ACTIVE
ADAPTER
FAULT
I/O RACK
FAULT
Indicators Description Probable Cause Recommended Action
Active Adapter
Fault
I/O
Rack
On Off Off Normal indication;
remote adapter is fully
operational
Off On Off RAM memory fault, watchdog timeout Replace module.
On Blink Off Module placement error I/O module in incorrect slot. Place module in correct slot in chassis.
Blink in unison Off Incorrect starting I/O
group number
Error in starting I/O group number or
I/O rack address
Check switch settings.
On On On Module not
communicating
Incorrect transmission rate setting
Off On On Module not
communicating
Scan switch set for “all but last four
slots” in 1/4 rack
Reset scan switch setting.
Blink Off Off Remote adapter not
actively controlling I/O
(scanner to adapter
communication link is
normal)
(1)
Controller is in program or test mode
Scanner is holding adapter module in
fault mode
Fault should be cleared by I/O scanner.
LEDs sequence on/off from
top to bottom
Module not
communicating
Another remote I/O adapter with the
same address is on the link.
Correct the address.
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