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7 Digital Output Units
NX-series Digital I/O Unit User’s Manual (W521)
7-4 Function
7
7-4-1 List of Digital Output Unit Functions
7-4 Function
This section describes the Digital Output Unit functions.
Refer to the specifications of each model in A-1 Data Sheet on page A-2 for details on the functions.
7-4-1 List of Digital Output Unit Functions
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 5-5
Synchronous I/O Refresh-
ing
With this I/O refreshing method, the timing to read inputs or to
refresh outputs is synchronous on a fixed interval between
more than one NX Unit on more than one Slave Terminal.
5-2-6 Synchro-
nous Output
Refreshing on
page 5-13
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 asynchronous to the NX bus refresh
cycles.
Data exchange between the NX Units and EtherCAT Coupler
Unit are performed cyclically on the NX bus refresh cycles.
5-2-7 Time Stamp
Refreshing on
page 5-18
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
5-24
Load Rejection Output
Setting
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.
7-4-2 Load Rejec-
tion Output Setting
on page 7-12
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
7-18
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