Help on RSViewME Scaling

Hi,

I'm working on a RSViewME project, where some numeric display and numeric entry require some scaling.

For numeric display, value from PLC is from 3000 to 10000. Display is 0 - 100 %

While for numeric entry, value is 0 - 100 (from RSViewME), data to be received by PLC is 7000 - 8000.

Anyone familiar with these scaling please brief me, as I don't have PLC here to test at the moment.

Thanks a lot.

To scale numeric displays in RSView ME, you will create an "expression" in the tag properties pop-up. An expression is made up of BASIC programming-like commands. Use the expressions:

Scaled value = (input value x rate) + offset
Rate = (scaled max. - scaled min.) / (input max. - input min.)
Offset = scaled minimum - (input minimum x rate)

The same could apply going the other way although, depending on the application, it mat be easier scaling the data within the PLC.

rdub said:

To scale numeric displays in RSView ME, you will create an "expression" in the tag properties pop-up. An expression is made up of BASIC programming-like commands. Use the expressions:

Scaled value = (input value x rate) + offset
Rate = (scaled max. - scaled min.) / (input max. - input min.)
Offset = scaled minimum - (input minimum x rate)

The same could apply going the other way although, depending on the application, it mat be easier scaling the data within the PLC.

Click to expand...

If we enter the rate, offset, min & max values at the tag (during tag creation), it won't work?

It'll work but you'll need to create a different tag for "reading" and "writing" because the two scaling factors are different