Mitsubishi Electric RD77MS4 - Mark Detection Function

9 COMMON FUNCTIONS
9.9 Mark Detection Function
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9.9 Mark Detection Function
Any data can be latched at the input timing of the mark detection signal (DI).
Also, only data within a specific range can be latched by specifying the data detection range.
The following three modes are available for execution of mark detection.
Continuous detection mode
The latched data is always stored to the first of mark detection data storage area at mark detection.
Specified number of detections mode
The latched data from a specified number of detections is stored.
The detected position for a specified number of detections can be collected when the mark detection signal is continuously
input at high speed.
Ex.
Number of detections: 3
Ring buffer mode
The latched data is stored in a ring buffer for a specified number of detections.
The latched data is always stored at mark detection.
Ex.
Number of detections: 4
Mark detection data
storage area
Mark detection signal
Storage area 1
Mark detection data
storage area
Mark detection signal
The 3rd detection
The 4th detection
and later are ignored.
Storage area 1
Storage area 2
Storage area 3
Storage area 4
Mark detection data
storage area
Mark detection signal
The 5th detection
replaces the previous
first detection.
The 4th detection
Storage area 1
Storage area 2
Storage area 3
Storage area 4