I/O System For Safety I/O Units - Omron NX-SID Series User Manual

 Relationships for Standard Process Data Communications
The relationships for standard process data communications are shown in the following figure.
M
Standard
CPU Unit
The standard controller performs standard process data communications with the Safety CPU Unit
and the Safety I/O Units on the EtherNet/IP network.
A standard controller cannot output signals to Safety I/O Units.
Also, the Safety CPU Unit performs standard process data communications with the Standard I/O
Units on the same Slave Terminal.
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I/O System for Safety I/O Units

This section describes the I/O for the Safety CPU Unit and Safety I/O Units.
When the Safety CPU Unit exchanges signals with Safety I/O Units and other external devices, it does
so through logical interfaces that are called I/O ports.
I/O ports are created automatically when you create the control configuration for safety controls on the
Sysmac Studio and set up the safety process data communications.
You assign device variables to I/O ports to gain access to the external devices from the safety pro-
grams.
Safety program (or external communications)
Outside of Safety
CPU Unit:
You can check the I/O ports in the I/O Map of the Sysmac Studio.
NX-series Safety Control Unit User's Manual (Z930)
S
Coupler
Safety
Unit
CPU
Unit
Safety CPU Unit
Variables
Device variables
I/O port I/O port
Safety
Safety
I/O Unit
I/O Unit
Other Units
M Standard master
S Standard slave
S S
Standard process data communications
EtherNet/IP
S S S
Coupler
Safety
Unit
CPU
Unit
M
Communications between NX Units
I/O ports are logical interfaces that
allow the Safety CPU Unit to exchange
data with external devices.
1 Overview
S S
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