Mitsubishi Electric MELSEC-Q Series User Manual page 741

[Pr.805] Latch data range upper limit value, [Pr.806] Latch data range lower
limit value
Set the upper limit value and lower limit value of the latch data at mark detection.
When the data at mark detection is within the range, they are stored in "[Md.801]
Mark detection data storage area" (1 to 32) and the "[Md.800] Number of mark
detection" is incremented by 1. The mark detection processing is not executed.
• Upper limit value > Lower limit value
The mark detection is executed when the mark detection data is "greater or equal
to the lower limit value and less than the upper limit value".
• Upper limit value < Lower limit value
The mark detection is executed when the mark detection data is "greater or equal
to the lower limit value or less than the upper limit value".
• Upper limit value = Lower limit value
The mark detection range is not checked. The mark detection is executed for all
range.
[Pr.807] Mark detection mode setting
Set the data storage method of mark detection.
Mode
Continuous
detection mode
Specified number of
detection mode
Ring buffer mode
Lower limit Upper limit
value value
Lower limit Upper limit
value value
Setting
Operation for mark detection
value
0 Always
Number of detections (If the
number of mark detection is
1 to 32 the number of detections or
more, the mark detection is not
executed.)
Always
(The mark detection data
-1 to -32
storage area 1 to 32 is used as
a ring buffer for the number of
detections.)
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Chapter 14 Common Functions
t
t
Mark detection data
storage method
The data is updated in the
mark detection data
storage area 1.
The data is stored to the
mark detection data
storage area "n".
n = (1+ Number of mark
detection)