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1 Features and System Configuration
NX-series Digital I/O Unit User’s Manual (W521)
1-4 List of Functions
1
1-4-2 Digital Output Units
1-4-2 Digital Output 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.
5-2-6 Synchro-
nous Output
Refreshing on
page 5-16
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
Output refreshing
with specified time
stamp
With this I/O refreshing method, the Output Units refresh out-
puts at specified DC times.
5-2-9 Output
Refreshing with
Specified Time
Stamp on page
5-27
Load Rejection Output
Setting
A function that performs the preset output operation when the
Digital Output Unit cannot receive output data due to an NX
bus error or CPU Unit watchdog timer error, in the case of
Units connected to a CPU Unit.
A function that performs the preset output operation when the
Digital Output Unit cannot receive output data due to a host
error on the Communications Coupler Unit or an error on the
NX bus, in the case of Slave Terminals.
7-4-2 Load Rejec-
tion Output Setting
on page 7-13
Load Short-circuit Protec-
tion
A function in which the output will turn OFF to protect the out-
put circuit when an overload or load short-circuit occurs due to
a failure of the connected external devices.
7-4-3 Load
Short-circuit Pro-
tection on page
7-17
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