IDEC FC4A-C10R2 User Manual page 339

Fc4a series microsmart micro programmable logic controller

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Timing Chart for Disable Pulse Counting

This program demonstrates a timing chart of the PWM2 instruction without pulse counting.

Pulse Width Ratio D101

Pulse Output ON M20

Pulse Output Complete M21

• When input I1 is turned on, PWM2 starts to generate output pulses at the frequency designated by the value

stored in data register D100. The pulse width is determined by the value stored in data register D101. While the

output pulses are sent out from output Q1, internal relay M20 remains on.

• When input I1 is turned off, PWM2 stops generating output pulses immediately, then internal relay M20 turns off

and internal relay M21 turns on.

• If the pulse width ratio value in D101 is changed while generating output pulses, the change takes effect in the

next scan. When changing the pulse width ratio, make sure that the timing of the change is much slower than the

output pulse frequency, so that the pulse width ratio is changed successfully.

D102 = 0 (disable pulse counting)

Start Input I1

Output Pulse Q1

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Troubleshooting