1 Mount the terminal block hook that is applicable to each Unit model on the guide at the bottom
of the NX Unit, lift up the terminal block, and press in on the top of the terminal block until you
hear it engage.
The terminal block will click into place on the Unit. After you mount the terminal block, make
sure that it is locked to the Unit.
Refer to Applicable Terminal Blocks for Each Unit Model
on page 3-4 for the applicable terminal
blocks.
4-9-2
Preventing Incorrect Attachment of Terminal Blocks
In order to prevent unintentionally installing the wrong terminal block, you can limit the combination of
a Unit and a terminal block.
Insert three Coding Pins (NX-AUX02) into three of the six incorrect attachment prevention holes on the
Unit and on the terminal block. Insert these pins into positions so that they do not interfere with each
other when the Unit and terminal block are connected to each other
.
Y
ou can use these pins to create a combination in which the wrong terminal block cannot be attached
because the pin patterns do not match.
4 Installation and Wiring
4-55
NX-series System Units User's Manual (W523)
4-9 Wiring the Terminals
4
4-9-2 Preventing Incorrect Attachment of Terminal Blocks
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