1 Features and System Configuration
1 - 16
NX-series Digital I/O Unit User’s Manual (W521)
1-4 List of Functions
This section provides an overview of functions that the Digital I/O Units have.
Refer to the specifications of each model in A-1 Data Sheet on page A-2 for details on the functions.
1-4-1 Digital Input Units
Function name Description Reference
Free-Run Refreshing With this I/O refreshing method, the refresh cycle of the NX
bus and the I/O refresh cycles of the NX Units are asynchro-
nous.
5-2-4 Free-Run
Refreshing on
page 5-8
Synchronous I/O Refresh-
ing
With this I/O refreshing method, the timing to read inputs or to
refresh outputs is synchronized on a fixed interval between
more than one NX Unit connected to a CPU Unit.
In addition, with this I/O refreshing method, the timing to read
inputs or to refresh outputs is synchronized on a fixed interval
between more than one NX Unit on more than one Slave Ter-
minal.
5-2-5 Synchro-
nous Input
Refreshing on
page 5-12
Time Stamp Refreshing With this I/O refreshing method, the NX Units record the DC
times when inputs change or perform outputs at specified DC
times. These times are not synchronized to the NX bus refresh
cycles.
Data exchange between the NX Units and the CPU Unit and
data exchange between the NX Units and the EtherCAT Cou-
pler Unit are performed cyclically on the NX bus refresh
cycles.
5-2-7 Time Stamp
Refreshing on
page 5-19
Input refreshing
with input changed
time
With this I/O refreshing method, the Input Units record the DC
times when inputs changed.
5-2-8 Input
Refreshing with
Input Changed
Time on page 5-20
Input Filter This function eliminates the chattering or the noises from input
signals.
It is used to prevent the error reading due to the noises. You
can set the filter time constant.
6-4-2 Input Filter
on page 6-14
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