Omron NT20S Operation Manual page 80

Communicating with the PC Using C200H Direct Communication
Connection to CjjH
Connect the CPU unit with an I/O connection cable. The following restrictions ap-
ply when making this connection.
S A maximum of one CPU unit can be connected.
S Up to two I/O units can be connected for the one CPU unit, but I/O extension
units cannot be connected.
S It is not possible to connect a CjjH I/O unit after the NT20S. It must be the final
connection in the system.
I/O connection cable
(C20H-CNjj2)
I/O connection cable
(C20H-CNjj2)
I/O connection cable
(NT20M-CNPjj2
/C20H-CNjj2)
Note: When connecting a CjjH, always install a noise filter.
1. Insert the noise filter in the power supply line of the CjjH.
2. Make the distance between the noise filter and the CjjH as short as possible
and separate it from the power supply line.
3. Install the noise filter case on the FG face.
4. Use a ZGB2202-01U(manufactured by TDK) or equivalent as the noise filter.
+24V
CPU unit
I/O unit
I/O unit
(Rear face of NT20S)
Noise filter
1
IN OUT
2
Max. 2 units
Host interface connector
4
+
24V
3
–
Section 2-7
61