Digital Mixed I/O Units - Omron NX-ID User Manual

1 Features and System Configuration
1-4-3

Digital Mixed I/O Units

Function name
Free-Run Refreshing
Synchronous I/O Refresh-
ing
Input Filter
Load Rejection Output
Setting
Load Short-circuit Protec-
tion
1 - 18
Description
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.
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.
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.
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.
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.
5-2-4 Free-Run
Refreshing on
page 5-8
5-2-5 Synchro-
nous Input
Refreshing on
page 5-12
6-4-2 Input Filter
on page 6-14
7-4-2 Load Rejec-
tion Output Setting
on page 7-13
7-4-3 Load
Short-circuit Pro-
tection on page
7-17
NX-series Digital I/O Unit User's Manual (W521)
Reference