Slave Terminal
The Safety CPU Unit performs
safety process data communica-
tions with the Safety I/O Units.
Slave Terminal
Safety
CPU Unit
NJ/NX-series
CPU Unit
Coupler
Unit
Safety control system
NJ/NX-series EtherCAT Communications System
EtherCAT master
• Coupler Unit: EtherCAT Coupler Unit
• Safety Input: Safety Input Unit
• Safety Output: Safety Output Unit
(These abbreviations apply to all figures in this manual.)
Safety Output
Safety Input
Safety Output
Safety Input
Coupler
Unit
Coupler
Unit
EtherCAT
The Safety CPU Unit serves the FSoE master function to control the Safety I/O Units with the FSoE
slave function served and the FSoE slave.
*1
As shown in the above figure, the Safety CPU Unit can be
used to control not only the Safety I/O Units
that are mounted to the same CPU Rack or EtherCAT
Slave Terminal, but also it can control Safety I/O Units that are mounted to other EtherCAT Slave Ter-
minals through the EtherCAT network. You can use only one Safety CPU Unit on each EtherCAT net-
work.
*1. The connectivity of FSoE communications between the OMRON NX-series Safety Control Unit is confirmed
using the OMRON 1S-series Servo Driver.
Y
ou can also mount just a Safety CPU Unit to an EtherCAT Coupler Unit without mounting Safety I/O
Units, as shown in the following figure. Standard I/O Units
*1
can also be mounted in the same Slave
Terminal, but they cannot be controlled by the Safety CPU Unit.
*1. This refers to NX Units used for standard control, such as Digital Input Units and Digital Output Units.
EtherCAT master
Safety
CPU
Unit
NJ/NX-series
CPU Unit
Coupler
Unit
Safety Output
Safety Input
Safety Output
Safety Input
Coupler
Unit
Coupler
Unit
Digital Output
Digital Input
EtherCAT
Refer to the NX-series
EtherCAT Coupler Unit User’s Manual (Cat. No. W519) for information on
EtherCAT network configurations.
1 Overview
1 - 9
NX-series Safety Control Unit User's Manual (Z930)
1-2 System Configuration and
Configuration Devices
1
1-2-1 Safety Control System Configuration on NX bus of CPU Unit or EtherCAT Network