
Switch Settings
Chassis Backplane
4-2
Switch 1
Switch 2
5
6
ON
OFF
Last State
Switches
Processor Restart Lockout
Addressing
ATTENTION:
We recommend that you set switch 1 to the OFF position to de-energize outputs wired to this
chassis when a fault is detected. Also, if outputs are controlled by inputs in a different rack and a remote I/O rack
fault occurs (in the inputs rack), the inputs are left in their last non-faulted state. The outputs may not be properly
controlled and potential personnel and machine damage may result. If you want your inputs to be anything other
than their last non-faulted state, then you need to program a fault routine.
Outputs of this I/O chassis are turned off when a comunication fault is detected by this I/O adapter.
Processor can restart the I/O chassis after a communication fault.
Set this switch to ON if you plan to use I/O rack auto-configuration.
You must manually restart the I/O chassis with a switch wired to the
1771-AS or -ASB, or with the pushbutton mounted in the 1771-ALX.
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
2-slot
1-slot
1
1/2-slot
1,2
Not allowed
1
The 1771-AS adapter does not support 1-slot or 1/2-slot addressing.
When you use this adapter, set switches 5 and 6 to the OFF position.
2
The 1771-ASB series A adapter does not support 1/2-slot addressing.
Always
Off
Pressed in at bottom
Open (OFF)
Pressed in at top
Closed (ON)
Always
Off
Outputs of this I/O chassis remain in their last state when a communication fault is detected by this I/O adapter.
Switch Assembly Settings for I/O Chassis Backplane – 1771-ASB Remote I/O Adapter Module, 1771-ACN(R) and -ACN(R)15 ControlNet Adapter or
1771-ALX Extended Local I/O Adapter Module in the I/O Chassis