Panasonic FP-X0 L14R User Manual page 129

Input pulse measurement instruction (F178): For L40 and L60 types only
This instruction is used to measure the pulse number and cycle of a specified high-speed counter
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channel when using the high-speed counter function.
The pulse number to be measured is counted in a specified counting cycle.
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The one pulse (on-off cycle) right after the execution of the instruction is measured as the pulse cycle.
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Note) The last numbers of the actual measured values may vary due to the measurement error.
Operation of F178 instruction (In case of the above sample program)
Example) When a single pulse of 250Hz was measured repeatedly
Pulse number measured within 100 ms: 25 (Error±1) is stored in DT200 and DT201.
Pulse cycle: 1/250 x 10
Pulse cycle: 1/250 x 10
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6
= 4000 (Error±1) is stored in DT202 and DT203.
3
= 4 (Error±1) is stored in DT204 and DT205.
Setting conditions:
Channel No.: 0
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Storage location of measured pulse number:
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DT200～DT201
No. of moving average of measured pulse number:
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Once
Measurement cycle of measured pulse number:
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100ms
Pulse cycle measurement by 1µs and 1 ms
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Storage location of measured pulse cycle (1 µs
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unit): DT202 to DT203
Storage location of measured pulse cycle (1 ms
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unit): DT204 to DT205
Measurement limit of measured pulse cycle (1ms
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unit): 2s