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Chapter Introduction
Power Supply Module
1
Central Functions
This chapter discusses the power supply, the CPU, and self-test
routines for GuardPLC controllers.
For information about:
the power supply
functional description of the central module 2-2
self-test routines
error diagnostics
GuardPLC 1200 is a compact system which includes a CPU, 20 digital
inputs, 8 digital outputs, 2 counters and communication ports in a
single package. An external 24V dc power supply is required.
GuardPLC 1600 and GuardPLC 1800 systems include an integrated
CPU and on-board I/O, as well as optional distributed I/O. An
external 24V dc power supply is required.
GuardPLC 2000 is a modular system, in which a power supply
module, a CPU module, and up to 6 local I/O modules comprise the
system.
The power supply transforms the system supply voltage from 24V to
3.3V dc/5V dc (used for internal I/O Bus).
The power supply used with the GuardPLC 1200, 1600 or GuardPLC
1800 controllers must feature galvanic isolation since inputs and
outputs are not electrically isolated from the processor. In addition, it
must fulfill the requirements of IEC 61131-2 and SELV (Safety Extra
Low Voltage) or PELV (Protective Extra Low Voltage).
AB Parts
Chapter
See page:
2-1
2-3
2-4
Publication 1755-RM001B-EN-P - March 2004
2
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