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Synchronous control of a pulse motor

Synchronize and control the roller speed at the feeding side and the ejecting side of a device.

Control is easy when using the frequency counter function and specified frequency pulse output function featured as standard with the Visual KV Series.

Application: Time adjustment for sheet material remaining in the processing bath.

s Programming Technique

Use the frequency counter function of high-speed counter CTH0 to measure the frequency of the pulses (Hz) sent through input 0004. Then, use the specified frequency pulse output function to output the pulse of the same fre-quency as the measured input pulse from 0501.

The pulses are output after the frequency is changed according to the measurement result. The response is de-layed by the length of the measurement.

Devices used with the frequency counter

Special utility relays

Data memory

Devices used with the specified frequency pulse output

Special utility relays Data memory Pulse output Outline .

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VOL. 23 Synchronous control function

Programming Example

The frequency of the pulse sent through input 0004 is measured every 100 ms. Then, the pulses of the same frequency are output from 0501. The pulse output is disabled when the measured frequency is less than 16 Hz.The measurement cycle is set to 100 ms. The frequency counter start relay (2305) turns ON.

The input time constant of input 0004 is set to 10 μs.The specified frequency pulse output start relay (2306) is turned ON. The measured frequency (DM1405, Unit: Hz) is used as the

output frequency (DM1936, Unit: Hz).

Output 0500 turns ON when an error occurs in the setting of the

specified frequency pulse output.Tips