Allen-Bradley GuardPLC 1753, Справочник по безопасности

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42 Publication 1753-RM002C-EN-P - September 2008
Chapter 4 GuardPLC Controller and GuardPLC I/O Output Channels
Overview of GuardPLC
Output Modules
See the table below for an overview of GuardPLC output capabilities.
General Safety Information
On GuardPLC Safety
Outputs
The GuardPLC safety output modules are written to once in every
cycle. The output signals are read back and compared with the output
data given by the application logic.
For outputs, 0 is the safety state (or an open relay contact).
Three testable semi-conductor switches have been integrated, in
series, into the safety output modules. Thus, the second independent
switch-off, required for safety technical reasons, has been integrated
on the output module.
This integrated safety switch-off safely shuts down all channels of the
output module (de-energized condition) if an error occurs.
Output Capabilities
Controller/Module Type Quantity Safety-
Related
Electrically
Isolated
GuardPLC 1200 Digital Output 8 X —
GuardPLC 1600 Controller Digital Output 8 X —
GuardPLC 1800 Controller Digital Output 8 X —
GuardPLC 16-point DC
Output Module 1753-OB16 Digital Output 16 X —
GuardPLC 20/8 DC I/O
Module 1753-IB20XOB8 Digital Output 8 X —
GuardPLC 8/8 DC I/O
Module 1753-IB8XOB8 Digital Output 8 (1-pole) X —
2 (2-pole) — —
GuardPLC 16/8 DC I/O
Module 1753-IB16XOB8 Digital Output 16 (1-pole) X —
8 (2-pole) X —
GuardPLC 2000 DIO Module
1755-IB24XOB16
Digital Output 16 X X
GuardPLC 2000 CO Module
1755-HSC
Digital Output 4 X X
GuardPLC 2000 AO Module
1755-OF8
Analog Output 8 X X
GuardPLC Relay Module
1753-OW8
Relay Output
(1)
(1)
Relay outputs cannot be used as pulsed outputs.
8 X X
GuardPLC Analog
Input/Output Module,
1753-IF8XOF4
Analog Output 4
X
(2)
(2)
The analog outputs may be used only as safety-related outputs if the output values are read back to
safety-related analog inputs and evaluated in the user program.
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