1 Features and System Configuration
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NX-series Digital I/O Unit User’s Manual (W521)
1-1 Features and Types of Digital I/O
Units
This section describes features and types of Digital I/O Units.
The Digital I/O Units are NX Units to process inputs and outputs of digital signals (ON/OFF signals).
The NX-series Digital I/O Units have the following features.
When the EtherCAT Coupler Unit is used together with NX Units that support synchronous I/O refresh-
ing, the I/O control of multiple NX Units can be synchronized at the time to synchronize with the refresh
cycle of the NX bus.
This provides an accurate I/O control because it suppresses jitter in the I/O timing of multiple NX Units.
You can use EtherCAT Coupler Units with NX Units that support input refreshing with input changed
time and with other NX Units that support output refreshing with specified time stamp to control the out-
puts 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.
1-1-1 Digital I/O Unit Features
Synchronous I/O with Refresh Cycle of the NX Bus
Controlling Outputs at Fixed Intervals After Inputs Change
Simple I/O Wiring with a Screwless Clamping Terminal Block
External output device
(Output)
Workpiece
Sensor
(Input)
Fixed interval
When input changes When output is made
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