4-20ma psi transmitter input

kpmec · Aug 2, 2008

Can someone describe the process(logic) to take a 4-20ma analog input from psi transmitter and scale it to 0-1500# output in real numbers. Thanks,

Mickey · Aug 2, 2008

It would help if you tell us what PLC you are using. Analog card part number, the more info the more accurate the help.
But to get you started see link below and look at "Scaling" part one and two.

http://www.ronbeaufort.com/sample_lessons.htm

Also this thread below.
http://www.plctalk.net/qanda/showthread.php?t=40434&highlight=scaling

Or:
(Raw Value/Max Raw Value)*1500=Scaled Value

kpmec · Aug 2, 2008

Thanks,

We use GE Fanuc 90/70 system with DOS based Logic Master 90 programming software (yeh I know). Thanks,

Mickey · Aug 2, 2008

kpmec said:
We use GE Fanuc 90/70 system with DOS based Logic Master 90 programming software (yeh I know). Thanks,

Well that takes me out of the equation. Hopefully the GE experts will check in for you.
But I think the basic math would still apply.

mo_eng · Aug 3, 2008

when you use a pressure transmiter 4-20ma that mean 4=0bar and 20=25bar. do u need analog output 0-1500?
why do u need that?

Steve Bailey · Aug 3, 2008

Using Logicmaster you can scale the analog signal in the hardware configuration. The raw data will range from 0 to 32000. You enter 0 and 1500 for the corresponding engineering units.

The data reported by the analog input module will be a 16-bit integer. If you need it in floating point, you will have to use a INT_TO_REAL conversion function in ladder logic.

kpmec · Aug 4, 2008

Thanks,

Good info, I was not aware that you could scale in hardware config.
Thanks,

4-20ma psi transmitter input

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