Operation Of Pulse Catch Function - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Operation of pulse catch function

Operation of the pulse catch function is explained below.
Basic operation of pulse catch function
The corresponding input device is turned ON for the duration of the scan following the scan where the pulse signal is
detected. The input device is turned OFF at the END instruction.
■Operation when input signal is used as pulse catch function
The rising edge of the external input signal (X0) is detected, and the input device is turned ON only during the following scan.
Step 0
Program
External input
signal
OFF
X0
Input device
OFF
X0
■Operation when multiple pulses are detected within one scan
The second pulse onwards is ignored. Input pulse signals at intervals of one scan or longer.
Step 0
Program
ON
External input
signal
OFF
X0
ON
Input device
OFF
X0
■Operation when the same pulse is detected for two scans or more
The input device is turned ON for the detected number of scans. Input pulse signals at intervals of one scan or longer.
Step 0
Program
ON
External input
signal
OFF
X0
ON
Input device
OFF
X0
END/Step 0
Input signal turns ON
END/Step 0
Input signal turns ON
Pulse of this section is ignored.
END/Step 0
Input signal turns ON Input signal turns ON
1 scan ON
1 scan ON
END/Step 0
1 scan ON
END/Step 0 END/Step 0
1 scan ON
2 scans ON
19 HIGH-SPEED INPUT/OUTPUT FUNCTION
END/Step 0
END/Step 0
19.4 Pulse Catch Function
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