Publication 1747-UM011G-EN-P - June 2008
BATT
(Color: red)
On (steady) The battery voltage has fallen below a 
threshold level, or the battery is missing or not 
connected.
Off The battery is functional.
FORCE
(Color: amber)
Flashing  One or more input or output addresses have 
been forced to an On or Off state but the forces 
have not been enabled.
On (steady) The forces have been enabled.
Off No forces are present or enabled.
ENET
Channel 1
(Color: 
green or red)
Solid green The Ethernet port is functioning properly and is 
connected to an active Ethernet network.
Flashing green The Ethernet port is functioning properly, 
connected to an active Ethernet network, and is 
transmitting packets.
Flashing red A hardware or software fault has occurred and 
is being reported via a code. Contact 
Allen-Bradley for assistance.
Off No Ethernet connection or processor halted.
RS-232
Channel 0
(Color: green)
On (steady)
DF1/Modbus RTU 
Master/ASCII mode
The SLC 5/05 processor is transmitting on the 
network.
Off
DF1/Modbus RTU 
Master/ASCII mode
The SLC 5/05 processor is not transmitting on 
the network.
On (steady)
DH-485 mode
The Channel 0 Communications Active bit 
(S:33/4) is set in the System Status file and the 
processor is actively communicating on the 
network.
Flashing
DH-485 mode
The processor is trying to establish 
communication, but there are no other active 
nodes on the DH-485 network.
Off
DH-485 mode
A fatal error is present (no communication).
Processor 
Status 
Indicator
When It Is Indicates that

1756-PA75R  1756-PA75R  1756-PA75R

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