Omron NT20, Руководство пользователя

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Communicating with the PLC Using C200H Direct Communications Section 2-7
• It is not possible to connect a C
@@
H I/O Unit after the NT20. It must be
the final connection in the system.
Note When connecting a C @@ H, always install a noise filter.
1. Insert the noise filter in the power supply line of the C @@ H.
2. Make the distance between the noise filter and the C
@@
H as short as pos-
sible 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 fil-
ter.
2-7-3 Turning the Power ON/OFF When Using C200H Direct
Communications
The NT20-ST121-E functions as an expansion I/O unit of the PLC. Use the
following procedure to turn the power ON and OFF.
!Caution Depending on the method used to turn the power ON and OFF, the entire sys-
tem may stop. Follow the procedure described below to turn the power ON
and OFF.
Power ON Turn the power ON as follows:
Turn ON the power to the NT20.
“Connecting to Host” is displayed on the NT20 screen.
I/O Connecting Cable
(C20H-CN
@@ 2)
CPU Unit
I/O Connecting Cable
(NT20M-CNP
@@ 2
/C20H-CN
I/O Connecting Cable
(C20H-CN
@@
2)
2 Units max.
I/O Unit
I/O Unit
(Rear face of NT20)
Host interface connector
Noise filter
1
2
4
3
+24 V IN OUT 24 V
+
–