Vision V130 Unsigned scaling

[farcry]

Hello.

I have a problem.

I'm communicating with MOXA ioLogik from whom I read RAW value of Analog Input.

The RAW value is in range from 0 - 65535.

The calculated value should be from 0 - 500.

If I use Linearization FB I've got wrong number with numbers over 32676 (Signed Negative)

The PLC always assumes that it is calculating with SIGNED INTEGERS.

How can I overcome this problem?

Thanks.

 

[Flex727]

It looks like you're using 16-bit integers (MIs) and are overflowing the register. Use 32-bit integers instead (MLs).

[farcry]

Thanks for answer but this is not the case.

Sollution:

 

 

[Ausman]

farcry, firstly just a FYI....you don't need SB1. 

To really make sense of what you're saying, we need a scrnshot of the Linear parameters that didn't work.

cheers, Aus

[Joe Tauser]

Do a STORE from the incoming MI to an ML and then Vector Copy from the ML to a DW to blow the sign bit out.

 

 

Joe T.