Function List - Mitsubishi MELSEC-L Series User Manual

3.3

Function List

The following is the function list of the A/D converter module.
Item
A/D conversion enable/disable function
Sampling processing
A/D conversion
method
Averaging
processing
Range switching function
Offset/gain setting function
Conversion speed switching function
Maximum value/minimum value hold function
Input signal error detection function
Alarm output function (process alarm)
Scaling function
Error history function
Module error collection
Error clear function
Save/restoration of offset/gain value
22
Sets whether to enable or disable A/D conversion for each channel.
Disabling the A/D conversion for unused channels reduces the
conversion cycles.
The A/D converter module executes the A/D conversion of the analog
input value sequentially and stores the digital output value to the buffer
memory.
Time The A/D converter module executes the A/D conversion by the period of
average the time for each channel, and stores in the buffer memory.
Count The A/D converter module executes the A/D conversion by the number of
average times for each channel, and stores in the buffer memory.
The A/D converter module averages the digital output value of set
Moving
number of times which is measured every sampling time period, and
average
stores in the buffer memory.
The input range to use can be selected from the factory default range
(4mA to 20mA, 0mA to20mA, 1V to 5V, 0V to 5V, -10V to 10V or 0V to
10V) and user range (user range setting).
This function compensates for errors in digital output values.
The conversion speed can be selected from 20µs, 80µs or 1ms.
The A/D converter module stores the maximum and minimum values of
the digital output value or the scaling values for each channel to the buffer
memory.
The maximum and minimum values are stored to the channels regardless
the setting of the A/D conversion method.
This function detects the analog input value which exceeds the setting
range.
This function outputs alarm when a digital output value is in the range set
in advance.
The A/D converter module scale-converts the output digital value to the
set range of the scaling upper limit value and scaling lower limit value.
This omits the programming of the scale conversion.
The function stores up to latest 16 recodes of errors and alarms occurred
in the A/D converter module to the buffer memory.
This function collects errors and alarms occurred in the A/D converter
module and stores to the CPU module.
Clearing the error from the system monitor at error occurrence is
possible.
The offset/gain value of the user range setting can be saved or restored.
Description
Reference
Page 48,
Section 8.2
Page 48,
Section 8.3
(1)
Page 49,
Section 8.3
(2)(a)
Page 49,
Section 8.3
(2)(b)
Page 50,
Section 8.3
(2)(c)
Page 40,
Section 7.2
Page 44,
Section 7.5
Page 52,
Section 8.4
Page 52,
Section 8.5
Page 53,
Section 8.6
Page 56,
Section 8.7
Page 59,
Section 8.8
Page 62,
Section 8.9
Page 64,
Section 8.10
Page 65,
Section 8.11
Page 66,
Section 8.12