Allen-Bradley 1771-ASB - Page 69

Settings for 1771-AS and 1771-ASB
Series A, B and C Remote I/O Adapters
Appendix B
B-12
Figure B.12
I/O
Chassis Backplane Switch Assembly Settings for 1771-AS Remote
Adapter Module in PLC-2 Family Processor System
12345678
O
N
O
F
F
Processor Restart Lockout -
When ON, processor can restart I/O chassis
When OFF, I/O chassis must be restarted at
the chassis.
Addressing Switch -
ON - 1-slot addressing selected
OFF - 2-slot addressing selected
Last State Switch -
When ON, outputs of this chassis
remain in last state.
When OFF, outputs of this I/O
chassis are deenergized when a
fault is detected.
Always OFF
Last Chassis Switch -
ON - Chassis does not contain the highest
numbered I/O group for the associated rack number
OFF - Chassis does contain the highest numbered
I/O group for the associated rack number
If you have only a primary chassis, set this
switch to OFF.
If you have both primary and complementary
chassis, set the primary chassis to ON and the
complementary chassis to OFF.
Caution: Set switch 1 to the OFF position
to deenergize outputs wired to this chassis
when a fault is detected. If switch 1 is set to
the ON position, outputs connected to this
chassis remain in their last state when a fault
occurs and machine motion may continue
after fault detection.
10823-I
Figure B.13
I/O
Chassis Backplane Switch Assembly Settings for 1771-AS Remote
Adapter Module in PLC-3 Family Processor System
12345678
O
N
O
F
F
Processor Restart Lockout -
When ON, processor can restart I/O chassis
When OFF, I/O chassis must be restarted at
the chassis.
Last State Switch -
When ON, outputs of this chassis
remain in last state.
When OFF, outputs of this I/O chassis
are deenergized when a fault is
detected.
Always OFF
Caution: Set switch 1 to the OFF position
to deenergize outputs wired to this chassis
when a fault is detected. If switch 1 is set to
the ON position, outputs connected to this
chassis remain in their last state when a fault
occurs and machine motion may continue
after fault detection.
1771-A1/A1B chassis in PLC-3 Backup
ON - If any 1771-A1/A1B chassis
contains starting I/O group 0 with 2-slot
addressing and the PLC-3 is configured
in backup mode.
OFF - All other times.
10824-I
Allen-Bradley PLCs