1 Overview
1 - 18
NX-series Safety Control Unit User’s Manual (Z930)
As described in the previous section, the standard controls and safety controls are linked with one
another throughout the setup procedures. This section describes the detailed procedures for the safety
controls. Refer to NJ/NX-series CPU Unit Software User’s Manual (Cat. No. W501) for the detailed pro-
cedures for using NJ/NX-series CPU Units for standard control.
1-5-2 Detailed Procedures
Step 1. System Design
Step Description Reference
Step 1-1 Determining
Safety Measures by Per-
forming Risk Assessment
• Identify potential danger factors and perform risk assessment.
• Study and decide on measures to reduce risks.
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Step 1-2 Selecting Safety
Devices
Select the safety devices for inputs, logic, and outputs of the
safety controls.
1-2 System Configuration
and Configuration Devices
on page 1-6
Section 2 Specifications
Section 3 Part Names and
Functions
Step 1-3 Designing the
Interface between Stan-
dard Controls and Safety
Controls
Design the interface between the standard controls and safety
controls.
This is done by exposing the global variables to the
NJ/NX-series CPU Unit.
6-7 Exposing Variables to
Standard Controllers on
page 6-20
Step 2. Software Design
Step Description Reference
Step 2-1 Designing I/O and
Processing
Design the configuration of the safety I/O devices and Safety I/O
Units.
• Safety I/O devices
• Program contents
Section 3 Part Names and
Functions
Step 2-2 Designing Safety
Programs
Design the POUs (Program Organization Units).
• Programs
• Function blocks
Design of Variables:
• Design the data types of the variables (particularly the design
of safety data types and standard data types).
• Define the variables that you will use in more than one POU
and variables that you will use in only specific POUs.
• Define the variable names for the device variables that you
use to access Safety I/O Units.
• Define the attributes of variables, such as the Name attribute.
• Design the variables to expose to the user program for the
standard controls.
• Design the interface with the safety controls of the user pro-
gram for the standard controls.
Section 7 Programming