Internet PLC Forum

I have an application where I count pulses from two photo cells (on two separate measuring wheels) with a T100MS2424 on a regular inputs with a standard counters (not HSC) It works well up to a certain speed but over that speed is losing counts. I have verified this using a frequency counter direct on the input line from the photocell.  I am using 2 channels for frequency measurement for another part of the machine so I don?t have 2 HSC channels to use to resolve it.

The question is: The counter is on a rung with the photocell input incrementing the counter. I do not have a special bit say .01 seconds to force the counter to be serviced. I have assumed that I don?t need one since the counter will be incremented whenever the input changes state.  Am I correct here?

I have thought of changing to the new F2424 board since it seems to have the ability to use 2 HSC and 2 frequency measurements on input at the same time. Is that correct? If I change to this board will the program run on the F25 from the older board? I see some input pin locations are different, but most else is the same.
Ideas will be appreciated. thanks

I have purchased the kit but it is not here yet. I would like to work on the program, can I donwload it in some way?
Thanks
Chris

Great news. I think this will make a great product even better. I really appreciate the way TRi is always listening to those of us using the product and adding features that make the product better. I have recently quoted some new automation projects with your products and the new additions will make my job easier and take a few less hours.

Thanks again, nice work.
Chris

I have an application that is counting inputs from an optical sensor with a conventional input to a standard counter. I suspect I am loosing counts at higher rates. The On time is quite short.

What is a good way to measure the scan time so I can estimate the rate I should be a able to read.

I would use the fast counters, but they are tied up.

Thanks.

I appreciate your response to this question.

I agree ladder works very well for simple machine functionality.
TRiLOGI Basic does complex tasks well. I think the most tedious develpoment is to navigate between the ladder and the functions so you don?t "hang up" the scan in a function.

Great products ! Thanks for the efforts.

I think the problem is that the STEPMOVE comman is being encountered before the previous move is completed.

As I understand it a STEPMOVE command is ignored until a previous STEPMOVE is completed. No buffering of STEPMOVE commands takes place, so the command is lost unless issued after the current move completes.

I will have to add a flag which checks the complete bit for the STEPMOVE command to prevent concurrent execution.

I think it would be helpful in future documentation to add an entry to
the keywords in TBASIC concerning the setting and reading of counter values using CtrPV[n]. Currently it is only listed under SetCtrSV as a footnote. Also the forn is somewhat differnet since you use the same command to both read and set the counter values.  Below is the foot note listed under SetCtrSV :

Related : The present values (P.V.) of counters can be read or written directly as integer variables   "CtrPV[n]". But the Set Values can only be changed by this function.

The current reference is a little obscure and takes away from this fine product.