A-D Conversion-Enabled/Disabled Setting - Mitsubishi Electric MELSEC A Series Manual

3. SPECIFICATIONS
3.7.1

A-D conversion-enabled/disabled setting

Whether A-D conversion is to be executed or not is written to buffer memory address
0 for each channel ("1" for enable and "0" for disable).
The sampling cycle can be shortened by setting "disable" for the unused channels
The default value for each channel is set as an A-D conversion.
Examples:
(1) Sampling cycle time when "enable" is set for all channels:
8
(number of enabled channels)
(2) Sampling cycle time when "enable" is set for channels 1 and 3:
2
(number of enabled channels)
(1) Enable/disable setting method
Enable or disable is set for each channel.
b15 b14 b13 b12 b11 b10 b9
  
Address 0
(2) Processing by the A68ADN for enable/disable setting
(a) Initialization for averaging processing
For averaging processing, the data stored in the work area by the A68ADN
system software is initialized.
The data stored in buffer memory prior to the setting of enable/disable
consists of digital values.
If conversion-enabled/disabled setting is made when 30 sampling times
have been completed at a channel which is set for 50 averaging processing
times, the sampling data collected in the 30 sampling times is cleared and
averaging processing is executed from the beginning.
(b) Resetting the A – D conversion-completion flag
The A – D conversion-completion flag (address 19 in buffer memory) for
channels 1 to 8 is reset.
×
(conversion speed per channel)
×
(conversion speed per channel)
b8 b7
     CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1
Ignored
3 − 14
0(/6(&0$ 0(/6(&0$
0(/6(&0$ 0(/6(&0$
MELSEC-A
20 ms
20 ms
b6 b5 b4 b3 b2 b1
Channel designations
1: A – D conversion-enabled
0: A – D conversion-disabled
= 160 ms
= 40 ms
b0