Omron NX1P2 series, Hardware User Manual

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Preventing Incorrect Attachment of Terminal Blocks
This feature is intended for the NX1P2-9
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24DT
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CPU Unit that has 24 built-in I/O points and pre-
vents incorrect attachment of input and output terminal blocks.
Although the shapes of the input and output terminal blocks are the same, they cannot be swapped
and attached in the wrong way. This feature prevents troubles caused by a terminal block that is at-
tached to a wrong place after it is wired.
When you remove the terminal blocks from the CPU Unit for wiring, be careful not to swap and attach
the input terminal block and output terminal block in the wrong way.
The following figure shows how to distinguish the input and output terminal blocks from each other.
Enlarged view
Input terminal
block
Output terminal
block
This terminal hole of the input terminal block is larger than others.
Additional Information
As shown below, incorrect attachment of the terminal blocks is prevented by the ribs.
Do not attach the terminal block forcefully.
Incorrect attachment prevention rib
Incorrect attachment prevention rib
5 Installation and Wiring
5-64
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)