Internet PLC Forum
General => Technical support => Topic started by: cch1955 on December 23, 2015, 04:21:23 PM
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I need to use the HSC to count a single channel square wave input without a second input in quadrature. The frequency of the count is 2000Hz maximum.
How can this be done. I willing to give up the phase B input line.
How can this be done?
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Just define a HSCDEF channel and by default the channel will count up if phase B is held at OFF.
E.g. for FMD88-10, input #3 and #4 forms a quadrature channel. By default without forcing into enhanced quadrature, the HSC will count up when input #4 is OFF and pulses coming into input #3.
Alternatively, if input #3 is held at OFF and pulses come into input #4 then HSCPV will decrement.
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Good to know this for single channel HSC needs, thanks.