User manual

Selecting Switch Settings
Appendix A
A-2
Make the following switch selections for a 1771-AS, -ASB, or -ALX
adapter module.
Switch
Switch
5
6
1
2
ON
OFF
Last State
Switches
Processor Restart Lockout
Addressing
Outputs of this I/O chassis remain in their last state when a communication fault is
detected by this I/O adapter
.
1
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.
2
You must manually restart the I/O chassis with a switch wired to the
1771AS or ASB.
ON
ON
ON ON
ON
OFF
OFF OFF
OFF
OFF
2slot
1slot
3
1/2slot
3
Not allowed
Pressed in at top Closed (ON)
Pressed in at bottom Open (OFF)
Always
Off
Always
Off
19308
1. ATTENTION: If you set this switch to the ON position, when a communication fault is detected, outputs connected to
this chassis remain in their last state to allow machine motion to continue. We recommed 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.
2. Set this switch to ON if you plan to use I/O rack autoconfiguration.
3. The 1771ASB series A adapter does not support 1/2slot addressing.
Chassis Backplane with
Adapter Module