SLC500 Math Register

[Joe Loescher]

Hi,

Does anyone here have any ideas why the S:13 bit would continually increment by 1 every second? It continues up to sixty, increments S:14 by 1 then starts over at zero. I can't see anything in the program doing this, I have 10 machines running basically the same program and only 1 is doing this.

 

[Joe Loescher]

Never Mind, I figured it out, Someone had divided the ACC value of timer. I moved the value to a floating point and then did the division and that fixed it.

Joe

 

[TConnolly]

You might want to carefully check the application again.

When you do integer division the math register holds the quotient and the remainder. Computing minutes and seconds would be a very good example of something where you want to know the quotient and the remainder. 120 seconds = two minutes and ten seconds. The quotient is 2 and the remainder is 10. If you needed 2:10 instead of 2.1667 then you might not want to change to using a floating point calculation.

Thats up to you to determine for your application of course, I'm just pointing out one possible reason it was originally done that way.