Omron NT20S-ST121B-EV3 User Manual page 97

Communicating with the PLC Using C200H Direct Communications
Connection to C H
@@
76
• There is only one C200H interface unit interface connector. This means
that it is not possible to connect an NT20 between a CPU Rack and an
Expansion I/O Rack. It must be the final connection in the system.
Expansion I/O Cable
(C200H-CN@@1)
Expansion I/O Cable
(NT20M-CNP@@1/
C200H-CN@@1)
Connect the CPU Unit with an I/O Connecting Cable. The following restric-
tions apply when making this connection.
• A maximum of one CPU Unit can be connected.
• Up to two I/O Units can be connected for the one CPU unit, but Expansion
I/O Units cannot be connected.
CPU Rack
Expansion I/O Rack
(Rear face of NT20)
Host interface connector
Section 2-7
1 Rack max.