
Troubleshooting
Extended Local I/O
5-30
Troubleshooting – 1771-ACN(R)15 Adapter Status Indicators
OK
Indicator
Display
Mnemonic
Description
Probable Cause
Recommended Action
Green
Red
Off
Off
None
Module not communicating
Power supply fault
Check power supply, cable
connectors, and seat adapter firmly in
chassis
Defective adapter
Contact Rockwell Automation for
service
POST
Adapter is running Power On Self Test None
None
Off
Blinking
POST
RSET
Module failed Power On Self Test
RAM or FLASH test failed.
Processor fault or watchdog time-out.
Push the reset button on the front of
the module
A#00
ERR
Illegal ControlNet address
Network address set to 00
Power down the adapter and change
the network address switch settings
MOD
ERR
I/O module placement error
Incorrect I/O module density for
addressing mode used
Place I/O module in correct slot in
chassis
RACK
ERR
Illegal backplane switch settings
Illegal addressing mode selected
Power down the adapter and change
the backplane switch settings
PRL
Adapter in processor restart lockout
mode (adapter to processor link is
normal)
Processor restart lockout switch on
chassis backplane in ON position
Depress reset button on module to
clear lockout feature, or cycle power
SHRT
BP
Communication on line. Excessive
noise on backplane or possible
shorted backplane.
Defective I/O module or chassis
backplane
Replace module or chassis
DUPL
NODE
Duplicate node address
Another adapter with the same
ControlNet address is on the network
Power down the adapter and change
the network address switches and
cycle adapter power
SW
ERR
Switch error
Network address switches have been
changed since module powerup
Set network address switches to
correct address and cycle adapter
power
STATUS
NET
ADDRESS
Display
OK
OK
STATUS
NET
ADDRESS
Display
OK
OK
ControlNet I/O Status