38 SAFETY DEVICES, SAFETY LABELS, AND CONSTANTS
38.1 Safety Devices
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38 SAFETY DEVICES, SAFETY LABELS, AND
CONSTANTS
This chapter describes the safety devices, safety labels, and constants.
38.1 Safety Devices
A safety device is a device used in safety programs. The safety devices can be used only in the safety programs.
• The safety devices cannot be used in the standard programs.
• An index modification and indirect specification cannot be performed in safety programs.
List of safety devices
The following table lists the safety devices.
For details on standard devices used for the SIL2 Process CPU, refer to the following.
Page 330 DEVICES
Classification Type Device name Symbol Number of
points (default)
Changeability with
parameter settings
Notation
Safety user devices Bit Safety input SA\X 8K points Selectable either 8K or 12K
points
Hexadecimal
Bit Safety output SA\Y 8K points Hexadecimal
Bit Safety internal relay SA\M 6K points Changeable ( Page 668
Safety device area setting
range)
Decimal
Bit Safety link relay SA\B 4K points Hexadecimal
Bit/word Safety timer SA\T 512 points Decimal
Bit/word Safety retentive timer SA\ST 0 points Decimal
Bit/word Safety counter SA\C 512 points Decimal
Word Safety data register SA\D 12K points Decimal
Word Safety link register SA\W 4K points Hexadecimal
Safety system devices Bit Safety special relay SA\SM 4K points Unchangeable Decimal
Word Safety special register SA\SD 4K points Decimal
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