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19 BUILT-IN I/O FUNCTION
19.4 Pulse Catch Function
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.
■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.
Program
END/Step 0
Step 0
Input signal turns ON
X0
Input device
X0
END/Step 0
OFF
OFF
1 scan ON
External input
signal
Program
END/Step 0
Step 0
Input signal turns ON
X0
Input device
X0
END/Step 0
ON
ON
OFF
OFF
1 scan ON
Pulse of this section is ignored.
External input
signal