Omron Sysmac NX-series, User Manual

Page: 53 / 306

1-4 List of Functions
This section describes the High-speed Analog Input Unit functions.
Function name Description Reference
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. 5-2-2 Setting the
I/O Refreshing
Methods
on page
5 - 7
Selecting Channel To Use This function skips the conversion processing and error de-
tection processing for unused inputs, and reduces the size of
I/O data for the Unit. 8-2 Selecting
Channel To Use
on
page 8 - 4
Input Range Selection This function sets the input range of analog input. 8-3 Input Range
Selection
on page
8 - 6
Number of Samplings
Setting This function sets the number of samplings for analog input
data to obtain.
The sampling period is determined by the task period of the
assigned periodic task and the number of samplings per peri-
od. 8-4 Number of
Samplings Setting
on page 8 - 8
Digital Filtering This function uses the digital filter to remove noise compo-
nents that are contained in analog input signals to suppress
the fluctuations of analog input values. You can use the digital
low-pass filter and moving average filters. 8-5 Digital Filtering
on page 8 - 18
Input Disconnection De-
tection This function detects disconnections of the analog input sig-
nal lines. It detects disconnections only when the input range
is 1 to 5 V or 4 to 20 mA. 8-6 Input Discon-
nection Detection
on page 8 - 29
Over Range/Under Range
Detection This function detects when the analog input signal exceeds
the range for which conversion is possible. 8-7 Over Range/
Under Range De-
tection
on page
8 - 31
User Calibration This function corrects offsets in the converted values that oc-
cur due to the deterioration of the NX Units and calibrate the
Units. 8-8 User Calibra-
tion
on page
8 - 33
Zero Set/Zero Reset The zero set function corrects the analog input value to be
the zero point at a desired time. The zero reset function re-
sets the correction that is performed with the zero set func-
tion. 8-9 Zero Set/Reset
on page 8 - 38
Trigger Input This function obtains the input value of the digital input signal
to trigger analog input signals, and the DC time at which the
input changed. 8-10 Trigger Input
on page 8 - 40
Input Filter This function prevents fluctuations of data and maintains sta-
bility when the input bits of digital input signal at the trigger in-
puts are unstable due to chattering or noise. 8-11 Input Filter on
page 8 - 48
1 Features and System Configuration
1 - 11
NX-series Analog I/O Units User’s Manual for High-speed Analog Input Units (W592)
1-4 List of Functions
1