4 PRECAUTIONS FOR USE OF SAFETY PROGRAMMABLE CONTROLLER
4.2 Precautions for Programming
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4
Creating programs for realizing the safety functions
Configure a program for realizing the safety functions using a method different from the standard program describing standard
control as a safety program.
Configure a safety program using safety devices, safety labels, standard/safety shared labels, instructions for safety measure,
and safety FB/FUN.
Devices can be used for the following safety program.
Local devices can be used for the following safety program.
• Safety internal relay (SA\M)
• Safety timer (SA\T, SA\ST)
• Safety counter (SA\C)
• Safety data register (SA\D)
Safety devices can be used in safety programs are read-only from the GOT. For details on these devices, refer to the GOT
manual.
Labels can be used in safety programs are safety global labels, safety local labels, and standard/safety shared labels only.
The following indicates whether standard/safety program labels can be used or not.
R/W: readable and writable, : not readable nor writable
*1 Global label selected "standard" in category
*2 Global label selected "safety" in category
*3 Local label defined as standard program
*4 Local label defined as safe program
Set capacity and number of points for safety device, safety label, and standard/safety shared label used by the Safety CPU
from parameter setting window of the engineering tool.
For how to create a useable device/label, how to create safety program, programming method, and execution type of
programs, refer to the following.
GX Works3 Operating Manual
MELSEC iQ-R CPU Module User's Manual (Application)
Classification Type Device name Symbol Notation
Safety user device Bit device Safety input SA\X Hexadecimal
Safety output SA\Y Hexadecimal
Safety internal relay SA\M Decimal
Safety link relay SA\B Hexadecimal
Bit/word device Safety timer SA\T Decimal
Safety retentive timer SA\ST Decimal
Safety counter SA\C Decimal
Word device Safety data register SA\D Decimal
Safety link register SA\W Hexadecimal
Safety system device Bit device Safety special relay SA\SM Decimal
Word device Safety special register SA\SD Decimal
Constant K Decimal
H Hexadecimal
Label type Standard program Safety program
Global label Standard global label
*1
R/W
Standard/safety shared global label R/W R/W
Safety global label
*2
R/W
Local label Standard local label
*3
R/W
Safety local label
*4
R/W
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