Guest Guest_David Posted September 28, 2005 Report Posted September 28, 2005 Is it possible to use a PLC (or some other means) to multiply an input pulse frequency to a output a pulse frequency say twice as high as the input? Using a PLC would be a convenient way for me to do it, but I'm open to other possibilities. Thanks. Quote
gravitar Posted September 29, 2005 Report Posted September 29, 2005 I have never used it, but the A-B Micrologix 1200 and 1500 have Pulse Train Output (PTO) and Pulse-Width Modulation (PWM) instructions. One of the elements of the control block for these instructions is the frequency.. I would imagine you could read a high-speed counter input, MULtiply it by some constant (or perform whatever mathematical manipulation you choose) and write it to the frequency word in the control block. Just a thought... Quote
Sergei Troizky Posted October 9, 2005 Report Posted October 9, 2005 What frequencies are we talking about? Actually, the input signal may be attached to two inputs of a PLC with interrupts assigned. One interrupt should be configured for the front and another- to the rear edge of the signal. Each interrupt must produce short pulse on the same output. This way the input frequency is doubled. For lower frequencies this can be done without interrupts. Quote
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