Table of Contents
5-2
GuardPLC Controller Operating System
Technical Safety for the
Operating System
Operation Mode and
Functions of the Operating
System
Publication 1755-RM001B-EN-P - March 2004
The essential functions of the operating system and their correlation to
the application program are shown in the following table:
Functions of the Operating System
Cyclical processing of the application
program
Configuration of the automation module
CPU test
I/O module tests (depending on type)
Reaction in error case
Diagnostic LEDs
Diagnostic possibilities of I/O and of the
CPU
Communication via Ethernet interface or
serial line
programming software interface:
permissible actions
Every licensed operating system is identified by its name. To aid in
identification, the revision and CRC signature are provided. The
applicable versions of the operating system and the related signatures
(CRCs), approved by TÜV for safety-related automation systems, are
subject to revision controls and are documented on a list compiled in
conjunction with TÜV.
Use RSLogix Guard PLUS to read the current operating system version.
Verification is required. See the checklist on page 5-8.
The operating systems process the application program in cycles. The
following functions, described in simplified form, are executed:
• read input data
• process logic functions programmed according to
IEC 61131-3
• write output data
Connections to the Application Program
Acts on variables, function blocks
Fixed by the selection of the GuardPLC
controller
---
Depends on the I/O modules used
Default setting
Application program is responsible for process
reaction
---
Use of the system variables for error messages
of the I/O and CPU
Data exchange via COM (serial) is effected via
a non-safe protocol: no writing of relevant
safety signal
Fixed in RSLogix Guard PLUS: Configuration of
protection functions,
User login
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