Mitsubishi Electric MELSEC-LD77MS2 User Manual page 847

Setting item
Number of mark
detection clear
Cd.800
request
Mark detection
Cd.801
invalid flag
Mark detection
Cd.802
invalid flag
Mark detection mode setting
Pr.807
Set the data storage method of mark detection.
Mode
Continuous
detection mode
Specified number of
detection mode
Ring buffer mode
(2) Mark detection control data
Setting details/setting value
Set "1" to execute "0" clear of number of mark detections.
"0" is automatically set after completion by "0" clear of
number of mark detections.
1: 0 clear of number of mark detections
Fetch cycle: Operation cycle
Set this flag to invalidate mark detection temporarily.
1 : Mark detection: Invalid
Others : Mark detection: Valid
Fetch cycle: Operation cycle
Request the processing of latch data range change.
Set the following value depending on the timing of
updating the change value.
1: Change in the next Operation cycle of the requested
2: Change in the next DI input of the requested
"0" is automatically set after the change is completed.
Fetch cycle: Operation cycle or DI input
Number of mark detection clear request
Cd.800
Set "1" to execute "0" clear of "
automatically set after completion by "0" clear of "
Mark detection invalid flag
Cd.801
Set "1" to invalidate mark detection temporarily. The mark detection signal during
invalidity is ignored.
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.)
Number of mark detection
Md.800
14 - 49
Chapter 14 Common Functions
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)
Buffer memory address
Default
LD77MS2
value
LD77MS4
0 54640+10k
0 54641+10k
0 54642+10k
k: Mark detection setting No.-1
". "0" is
Number of mark detection
Md.800
LD77MS16
".