Omron NT-series Programmable Terminal V022-E3-1 - Manual (Page 74)

    $ - "& 
   
Section 2-7
Connection to a C200H/C200HS, C200HX/HG/HE
Make the connection to the CPU unit or I/O extension unit with an I/O connecting
cable. The following restrictions apply to this connection:

Only one CPU unit, and one I/O extension unit, can be connected. Connection to
two I/O extension units is not possible.

Connection to remote I/O slave units is not possible.
 The C200H interface unit only has one interface connector. It is not possible to
connect a C200H interface unit between a CPU unit and an I/O extension unit. It
must be connected as the final element in the system.
CPU unit
I/O extension unit
Max. 1 unit
(Rear face of NT600S)
C200H I/F unit
I/O extension cable
(NT20M-CNP
 1/
C200H-CN  1)
I/O connection cable
(C200H-CN
 1)