Omron NX-SID Series User Manual

4-1
Relationship between Units and
Types of Communications
This section describes the relationships between Units and communications between Units in safety
control systems that use CPU Units, EtherCAT Coupler Units and EtherNet/IP Coupler Units.
4-1-1
Safety Control System on CPU Rack or EtherCAT Network
The section describes the relationships of the Safety CPU Unit, Safety I/O Units, and a standard CPU
Unit within the system, and provides details on communications between the Units based on the fol-
lowing figure.
Safety CPU Unit
Standard
CPU Unit
Inputs
Safety Input
Units
Safety Output
Units
Inputs
Outputs
Inputs
*1
Safety
process data
communications
Standard process
data communications
(C)
Safety control system
Standard process
data communications
(B)
(A)
*1. You cannot send outputs to the Safety Output Units. You can input the output values.
The safety control system consists of the Safety CPU Unit and Safety I/O Units.
The Safety CPU Unit performs safety controls with the Safety I/O Units through "safety process data
communications". (Section (A) in the above figure.)
The Safety CPU Unit can perform standard I/O control with a standard CPU Unit through
"standard
process data communications". (Section (B) in the above figure.)
The standard CPU Unit can also perform "standard process data communications" with Safety I/O
Units, but only for inputs. (Section (C) in the above figure.)
4 Safety Control Unit Operation
4 - 2
NX-series Safety Control Unit User's Manual (Z930)

Omron NX-SID Series Specifications

General

Brand	Omron
Model	NX-SID Series
Category	Controller
Language	English