Internet PLC Forum

General => Technical support => Topic started by: lyndon on April 21, 2003, 03:03:47 PM

Title: PulseFrequency & Input #3
Post by: lyndon on April 21, 2003, 03:03:47 PM

Would it be possible to use the Special I/O input #3 as PulseFrequency Ch #1 to calculate speed and at the same time use its NPN optic-sensor to trigger a counter that would calculate the distance travelled eventually?

Why I can't simulate the Pulsefrequency similar to an ADC input ch even when I excusively used the Input #3 as a Pulsefrequency channel?

Title: Re: PulseFrequency & Input #3
Post by: support on April 21, 2003, 03:12:54 PM

No, if the input is used as pusle measurement then it cannot be used as high speed counter anymore. You can feed the input from to both input #3 and #5 and use the second channel of HSC for counting distance.

There is no simulation for pulse measurement function. Input #3 on the TRiLOGI is purely a digital input only. On the M-series PLC the it happens to share the pulse measurement input with input #3 but in other PLCs design in future this may not always be the case.