Omron NX-SIH400, User Manual

Page: 135 / 626

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
Coupler
Unit
Coupler
Unit 1S-series Servo
Driver
Sa
fety
In
pu
t
Sa
fety
In
pu
t
Sa
fety
O
utp
ut
Sa
fety
O
utp
ut
Sa
fety
In
pu
t
Sa
fety
O
utp
ut
Safety
CPU Unit
Safety process data communications
Safety master
Safety slave
EtherCAT
NJ/NX-series
CPU Unit
Coupler
Unit
Coupler
Unit 1S-series Servo
Driver
Sa
fety
In
pu
t
Sa
fety
O
utp
ut
Sa
fety
In
pu
t
Sa
fety
O
utp
ut
Safety
CPU Unit
Safety process data communications
Safety master
Safety slave
EtherCAT
S S S
S S S S
S
M
M
S S S
S
S S
M
M
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.
4 Safety Control Unit Operation
4 - 3
NX-series Safety Control Unit User's Manual (Z930)
4-1
Relationship between Units and T
ypes of Communications
4
4-1-1
Safety Control System on CPU Rack or EtherCA
T Network