S7 Byte to Int question

I have a line of code that gets the current D/T and places it into a DB as 8 Bytes. My problem is I compare that to see if a particular hour and minute has occured but that criteria is in Decimal. The System time appears in Hex so the 2 do not compare properly.

I was thinking I could convert the Bytes of Current time to Int but can not seem to find that solution.

Any ideas?


Lance

Since Jesper's been looking at this for five minutes and still not answered, I guess I'm right in thinking that this isn't as easy as it sounds at first glance.

The first thought that occurs to me is that you could convert both of them to BCD and then compare them using an XOW instruction, when they are identical your result is zero otherwise non-zero.

Just a thought.

Why not have the compare criteria in DT format ?
You can then use the FC9 "EQ_DT", or FC12 "GE_DT", or FC14 "GT_DT" (from the IEC function blocks).

Otherwise you will have to convert the BCD values to decimal with the BTI "BCD to Integer" instruction.

I make your job easy. I have already done it.

Thanks to All, It turns out that I moved the Bytes to BCD then to Int for now and it works.

I will look at stream lining this using these suggestions.

I could use the compare in DT format probably. I am converting COntrol Logix code over to S7 and that is why I had that code like that.


Thanks all,

Lance