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FUNCTIONS

6.2 Safety CPU Operation Mode

6.2.2 Checking safety CPU operation mode

6 - 7

Overview

Performance

Specification

Sequence Program

Configuration and

Execution Conditions

I/O Nunber Assignment

Memories and Files

Handled by CPU Module

Functions

Communication with

Intelligent Function

Module

Parameters

(3) Checking with a special relay or a special register

The current safety CPU operation mode is stored in the special relay SM560 (TEST

MODE flag) and special register SD560 (safety CPU operation mode) in the CPU

module.

The safety CPU operation mode can be externally displayed using SM560 or SD560

in a program.

The safety CPU operation mode can be also checked by monitoring SM560 or SD560

with GX Developer.

Table6.3 Special relay/special register for confirming safety CPU operation mode

Device name Name Description

SM560 TEST MODE flag

Shows whether the current safety CPU operation

mode is TEST MODE or not.

• OFF: SAFETY MODE or SAFETY MODE (wait-for-

restart)

• ON: TEST MODE

SD560

Safety CPU

operation mode

Shows the current safety CPU operation mode.

• 0: SAFETY MODE

• 1: TEST MODE

• 2 : SAFETY MODE (wait-for-restart)

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