Mitsubishi Electric MELSEC iQ-R Series User Manual page 421

Use the following method to detect the data condition when the detection is difficult with the method described on the previous
page.
• 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.
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.
Sampling
The actual bit data in the CPU
module
Device to record the number of true
conditions
Data based on which changes in the
values sampled by high speed data
logger module, are monitored
Ex.
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)
Value changes Value changes Value changes Value changes Value changes Value changes
Appendix 14 Sampling Processes of High Speed Data Logger Module
The condition holds true between the data
sampling processes.
The device is incremented when the condition
holds true.
3
2
1
0
3
2
1
0
The condition state is detected as 'true', only
when the bit data is turned ON at the time of data
sampling
A
APPX
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