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1 Features and System Configuration
NX-series Digital I/O Unit User’s Manual (W521)
1-1 Features and Types of Digi-
tal I/O Units
1
1-1-2 Digital I/O Unit Types
You can use NX-series CPU Units or EtherCAT Coupler Units with NX Units that support input refresh-
ing with input changed time and with other NX Units that support output refreshing with specified time
stamp to control the outputs at fixed intervals after the sensor inputs change.
The terminal block is a screwless clamping terminal block.
You can connect the wires simply by pushing the ferrules into the terminals. The amount of wiring work
is reduced without requiring the use of screws.
The types of Digital I/O Units are as follows.
Refer to 1-3 Model List on page 1-7 for details on Digital I/O Unit models and 1-4 List of Functions on
page 1-16 for details on their functions.
Controlling Outputs at Fixed Intervals After Inputs Change
Simple I/O Wiring with a Screwless Clamping Terminal Block
1-1-2 Digital I/O Unit Types
Type Purpose
Digital Input Units These are Units with functionality to process input of digital signals from sensors
and other connected external devices.
Digital Output Units These are Units with functionality to process output of digital signals to relays and
other connected external devices.
Digital Mixed I/O Units These are Units with functionality to process input of digital signals from connected
external devices as well as functionality to process output of digital signals to con-
nected external devices.
External output device
(Output)
Workpiece
Sensor
(Input)
Fixed interval
When input changes When output is made
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