Exchanging Signals Between Units; Relationship Between Units And Types Of Communications - Omron NX-SID Series User Manual

1 Overview
1-4

Exchanging Signals between Units

This section describes how signals are exchanged between the Units in the safety control system.
1-4-1

Relationship between Units and Types of Communications

This section describes the relationships between Units and communications between Units in safety
control systems that use EtherCAT Coupler Units and EtherNet/IP Coupler Units.
Safety Control System
The section describes the relationships of the Safety CPU Unit, Safety I/O Units, and the Standard CPU
Unit within the communications system, and provides details on communications between the Units
based on the following figure.
(C)
Standard process
data communications
Inputs
*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 pro-
cess data communications. (Section (B) in the above figure.)
The Standard CPU Unit can also perform standard process data control with Safety I/O Units, but only
for inputs. (Section (C) in the above figure.)
1 - 12
Standard
CPU Unit
Standard process
data communications
Outputs
Inputs
Inputs
*1
(B)
Safety control system
Safety CPU Unit
(A)
Safety
process data
communications
Safety Input
Safety Output
Units
Units
NX-series Safety Control Unit User's Manual (Z930)