Mitsubishi Electric MELSEC-LD77MS2 User Manual page 840

[1] Operation for mark detection function
Operations done at mark detection are shown below.
• Calculations for the mark detection data are estimated at leading edge/trailing
edge of the mark detection signal.
However, when the specified number of detections mode is set, the current
number of mark detection is checked, and then it is judged whether to execute
the mark detection.
• When a mark detection data range is set, it is first confirmed whether the mark
detection data is within the range or not. Data outside the range are not
detected.
• The mark detection data is stored in the mark detection data storage area
according to the mark detection mode, and then the number of mark detection
is updated.
(1) Continuous detection mode
Mark detection signal
(Leading edge detection
setting)
Mark detection data value
Md.801 Mark detection data storage
area
Md.800 Number of mark detection
Pr.42 External command function
selection
Cd.8 External command valid
(2) Specified number of detection mode (Number of detections: 2)
Mark detection signal
(Leading edge detection
setting)
Mark detection data value
Md.801 Mark detection data storage
area (1st area)
Md.801 Mark detection data storage
area (2nd area)
Md.800 Number of mark detection
Pr.42 External command function
selection
Cd.8 External command valid
Confirmation of mark detection data range
(Upper/lower limit value setting: Valid)
Real current value
(Continuous update)
Detected real current value
0 1
"0" clear by setting "1" in " Cd.800 Number of mark detection clear request".
4: High speed input request
0
Set "1" before mark detection start.
Confirmation of mark detection data range
(Upper/lower limit value setting: Valid)
Real current value
(Continuous update)
Detection real current value (1st)
0 1
"0 clear" by "1" of " Cd.800
4: High speed input request
0
Set "1" before mark detection start.
14 - 42
Chapter 14 Common Functions
Data outside range are not latched.
Detected real current value
2
1
Mark detection is not executed
because the number of mark
detections is already
2 (More than the specified
number of detections).
Detection real current value (2nd)
2
Number of mark detection clear request".
1