Omron NX-AD series, User Manual

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7 - 9
7 Analog Output Units
NX-series Analog I/O Units User’s Manual for Analog Input Units and Analog Output Units (W522)
7-
5 Fu
nct
ion
s
7
7-5
-1 List
of Analo
g Outp
ut Unit Functions
7-5 Functions
This section describes the Analog Output Unit functions.
Refer to the specifications of each model in A-1 Data Sheet on page A-2, for details on the functions.
7-5-1 List of Analog 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 5-8
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
Selecting Channel To Use This function omits the conversion processing for unused
inputs. It is used to reduce the conversion cycle for its own
Unit.
7-5-2 Selecting
Channel To Use
on
page 7-10
Load Rejection Output
Setting A function that performs the preset output operation when the
Analog 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
Analog 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. 7-5-3 Load Rejec-
tion Output Setting
on page 7-14
Over Range/Under Range
Detection This function detects when the output set value exceeds the
range for which conversion is possible. 7-5-4 Over
Range/Under
Range Detection
on page 7-19
User Calibration This function corrects offsets in the converted values that
occur due to the deterioration of the NX Units and calibrate the
Units. 7-5-5 User Calibra-
tion
on page 7-20