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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
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.
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
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
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.
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
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
User Calibration
This function corrects offsets in the converted values that
occur due to the deterioration of the NX Units and calibrate the
Units.
Summary of Contents for NX-AD series
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