6-6
FUNCTION
DESCRIPTION
CHAPTER 6 FUNCTION DESCRIPTION
6-3 Measurement (K3MA-F)
Pulse Input
K3MA-F operates as a Frequency/Rate meter.
Measurements are made as follows.
• When the input pulse frequency is 4 Hz or more, it is measured in synchroniza-
tion with internal timings generated at intervals of 250 ms.
• The input pulse frequency is scaled and the process value is updated according to
the scaling result.
• Comparative output is provided based on the process value.
• The process value and comparative output are updated at intervals of 250 ms.
• When the input pulse frequency is less than 4 Hz, it is measured with pulse input
timings.
• Therefore, the intervals at which the process value and comparative output are
updated lengthen in accordance with the decreasing input pulse frequency.
Minimum Pulse Width
For pulse input, devices of low-speed contact output type or high-speed transistor
output type can be connected to the terminal depending on parameter setting.
When using a device of low-speed contact output type, set the input pulse frequency
to "30 Hz". To remove chattering noise when the input pulse frequency is "30 Hz",
both ON and OFF pulses must have at least 15 ms in width.
When using a device of high-speed transistor output type, set the input pulse
frequency to "5 kHz". In this case, both ON and OFF pulses must have at least 90 μs
in width.
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