The names of safety data type variables have the word SAFE appended to a standard data type name
such as SAFEBOOL and SAFEBYTE.
Refer to 6-2-5 Data Type
on page 6 - 14 for details on the safety data types.
Standard Data Type Variables
These variables represent data that is not related to safety controls.
Refer to 5-7 Exposing Variables to Standard Controllers
on page 5 - 30 for details on how to access
standard data type variables from the standard controllers.
Each type of signal is defined with a standard data type or safety data type as shown below.
Type of signal Data type of variable to use
Outputs from safety control to standard control Standard data type
Inputs from standard control to safety control
Safety inputs from external devices Safety data type
Safety outputs to external devices
Standard inputs from external devices Standard data type
Standard outputs to external devices
Internal safety-related signals with no I/O with any external devi-
ces
Safety data type
Internal standard-related signals with no I/O with any external de-
vices
Standard data type
4-2-3
Specifying Safety Data Types and Standard Data Types
The safety data type variables and standard data type variables are used depending on the type of
communications.
•
Signals that are input and output through safety process data communications must be defined as
safety data type variables.
•
Signals that are input and output through standard process data communications must be defined
as standard data type variables.
4 Safety Control Unit Operation
4 - 9
NX-series Safety Control Unit User's Manual (Z930)
4-2 I/O System
4
4-2-3 Specifying Safety Data Types and Standard Data Types
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