The 1771-A1B is an AB PLC-5 Chassis .
The AB 1771-A1B chassis is the backbone of every AB PLC-5
programmable controller system. This chassis provides a
communication path between various I/O modules and either the
controller or the I/O adapter module. 1771-A1B is a universal and
compact enclosure for the processor, power-supply modules, remote
and extended-local I/O adapter modules, and I/O modules.
1771-A1B chassis has 4 slots for mounting various modules. The
far-left slot of 1771-A1B chassis is reserved for either the
processor or adapter module. The other slots in the chassis are
compatible with communication modules, I/O modules, and
power-supply modules. It is crucial to follow the compatibility
tables for each PLC-5/1771 module. Please note the 1771-A1B is part
of series B. Power supplies 1771-P1, -P2, -P7 and -PS7 can be
mounted on the left side plate of the 1771-A1B chassis.
The 1771-A1B chassis is designed for panel mount installation.
1771-A1B chassis can receive power through processors with integral
power supplies that provide 2 to 4 amps, power supply modules that
provide 3 to 8 amps, and external power supplies that provide 6.5
to 16 amps.
The largest back-plane current for the 1771-A1B is 16 amps
operating at 5 Volts DC. The 1771-A1B chassis must be connected to
a central ground bus via grounding studs situated on the chassis
itself. The chassis’ power supply is configured via the
configuration jumper.
The jumper has two positions: "N" - position for external power
supply, and "Y" - position for power-supply module or processor
with and an integral power supply. 1771-A1B chassis cannot be
powered with both a power-supply module and an external power
supply at the same time.
