Omron NX-AD series, User Manual

Page: 50 / 290

1 Features and System Configuration
1 - 12 NX-series Analog I/O Units User’s Manual for Analog Input Units and Analog Output Units (W522)
1-4 List of Functions
This section provides an overview of functions that Analog Input Units and Analog Output 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 Analog 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
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.
6-5-2 Selecting
Channel To Use
on
page 6-13
Moving Average This function uses the average value of inputs of the set time
as the converted value. When the input value fluctuates fre-
quently due to noises, averaging can be used to obtain a sta-
ble converted value.
This function can be used only for Free-Run refreshing. 6-5-3 Moving Aver-
age
on page 6-17
Input Disconnection
Detection This function detects disconnections of the analog input signal
lines. It can be used only for models with an input range of 4 to
20 mA. 6-5-4 Input Discon-
nection Detection
on page 6-23
Over Range/Under Range
Detection This function detects when the input signal exceeds the range
for which conversion is possible. 6-5-5 Over
Range/Under
Range Detection
on page 6-24
User Calibration This function corrects offsets in the converted values that
occur due to the deterioration of the NX Units and calibrate the
Units. 6-5-6 User Calibra-
tion
on page 6-25