Programming math question

[niko9833 0]

Hello. Firstly, I am new to your forum, it is very well. My question. I have a problem with a mathematical equation that I have to repeat several times: X * Y = Z or X is a constant in memory and Y is a variable that uses numbers with comma. I have a CNT0001 that increments from 0 to 120, and for each PV there is a match with value (between 0.366 and 2.750) which corresponds to the Y. Ex: cnt = 1 matches in the equation with X * 0. 366 = Z Cnt = 2 matches in the equation with X * 0. 413 = Z... Whenever I use the calculation in the program, I check CNT0001 value for the match of the variable Y. I think work with IRS may be a good way to do but I've never used this feature and I am missing some information . Here's what I did: I thought to create a table for my variables Y with DIM (1; &2; &120; @ d100). I use MOVR (D100; IR0) Until that seems to work, but it is then that I blocks: how I change record in the table (for example when CNT = 2 or 51...) and how do I use the variable Y is found in IR0? I try * F (, IR0 H40; H42) and I get a response in H42 that seems good, is it the right way to do? Thank you for the information a+

[pfort 20]

Bonjour niko, From what i understand of your question, (not sure i understand well, i dont have perfect english too) i have a suggestion: I suggest that, instead of working with a CNT, you increment a "D" word. Then use that register as pointer to others "D" where are stored your values. You then acces to them with indirect adressing.

[PMCR 66]

niko I think that you are on the correct path. One way to use your counter is by using DRx, IRx. Example: DR0,IR0 as an address. *F DR0,IR0 H40 H42. DR0 is an offset from IR0. If IR0 points to D100, and DR0 = 9, then DR0,IR0 would point to D109. Note: You do not need to use the DR and IR as numerical pairs. DR5,IR0 is OK. DR15, IR14 is OK. I normally use DRx, IRx but DRy,IRx is also OK.

[niko9833 0]

Thank you for quickly responded. The cnt are necessary because they giving me my variable reference. They represent days and the corresponding variable is an additive... I tried the way PMCR gave me and it works very well. Missing me just the use of DR Another question: my # 1 table records are double (32-bit) for the number with comma. When my cnt increases by 1, the offset will be 1: IR0 = D101, but I need D102. Is there a way to do? thank's

[PMCR 66]

niko Sorry about that. I should have caught that. Simply multiply the BCD counter value by 2 and then convert this into HEX and use in the DR.

[niko9833 0]

I should have caught that to thanks again