Omron NX-SL3300 User Manual page 135

Relationship between Master and Slaves during Safety Process Da-
ta Communications
The following figure shows the safety master/slave relationship during safety process data communi-
cations.
NX-series CPU
Unit
S
EtherCAT
S
1S-series Servo
Driver
NJ/NX-series
CPU Unit
EtherCAT
S
1S-series Servo
Driver
The Safety CPU Unit performs safety process data communications with the following devices using
the FSoE protocol.
• Safety I/O Unit on the same CPU rack or the same Slave Terminal
• Safety I/O Unit on the Slave Terminal on the EtherCAT network
• EtherCAT slave with the FSoE slave function on the EtherCAT network (OMRON 1S-series Servo
Driver)
In the example above, the Safety CPU Unit operates as a master of safety process data communica-
tions. The 1S-series Servo Driver or the Safety I/O Unit operates as a slave of safety process data
communications.
The NJ/NX-series CPU Unit and the Communications Coupler Unit relay safety process data commu-
nications between a safety master unit and a safety slave unit.
Relationship between Master and Slaves during Standard Process
Data Communications
The Safety Control Unit operates as a standard slave of a standard CPU Unit through the connected
NX bus master. Safety process data communications with the standard CPU Unit are not available.
NX-series Safety Control Unit User's Manual (Z930)
Safety
CPU Unit
M S
Safety process data communications
Safety master
M
S Safety slave
Safety process data communications
Safety master
M
S Safety slave
4 Safety Control Unit Operation
Coupler
Unit
S S
S S
Coupler
Unit
Safety
Coupler
CPU Unit
Unit
S M S
S S
Coupler
Unit
4
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