Mitsubishi Electric QJ81DL96 User Manual page 684

APPENDIX
Use the following method to detect the data condition when the detection is difficult with
the method described on the previous page.
Since the device value changes when the condition is established, the "value change"
between the data sampling processes can be detected.
Even when the condition establishment time is less than the data sampling interval, the
condition establishment can be detected.
Actual bit data on
programmable
controller CPU
Device to record the
number of condition
establishments
Data to monitor the
value changes sampled
by high speed data
logger module
Remark
App
- 67 Appendix 12 Sampling Processes of High Speed Data Logger Module
Appendix 12.2 Detecting data condition establishment
• Prepare the device to record the number of condition establishments in a sequence
program.
• Set a "value change" as a condition for the device on a high speed data logger
module.
Sample Sample
0.0 1.0
Time
Value change
(0 to 1)
The following is an example of sequence program to record the number of condition
establishments on the device.
(M0 = bit device to indicate the condition, D0 = device to record the number of
condition establishments)
Sample Sample Sample
2.0 3.0 4.0
Value change
(1 to 2)
The condition is established
between the data sampling
processes.
The device is incremented
when the condition is
established.
3
2
1
0
3
2
1
0
(Seconds)
The condition establishments
can be detected because
value changes of the number
of the condition establishments
are monitored.