Scaling Analog input on PLC 5

I am trying to scale a Pressure transducer and can't figure it out. It is a 0-300psi. 4-20 milliamp signal and the card has a range of 0-4095. Card is a 1771-IFE. Thank you in advance for any help.

Within the 1771-IFE configuration applet, for the channel you have landed the transducer on, set:
Voltage/Current Range: 1 to 5 volts DC|4 to 20 mA
Raw Min = 0
Raw max = 300

dmargineau said:

Within the 1771-IFE configuration applet, for the channel you have landed the transducer on, set:
Voltage/Current Range: 1 to 5 volts DC|4 to 20 mA
Raw Min = 0
Raw max = 300

Click to expand...

You will lose resolution that way.

(Raw Data*300)/ 4095= engineering units

Or Raw Data * .07326 = Engineering Units

Mickey said:

You will lose resolution that way.

(Raw Data*300)/ 4095= engineering units

Or Raw Data * .07326 = Engineering Units

Click to expand...

Thanks for the replies.
How do I get the raw data from the input into the MUL instruction. The number in the integer file the BTR puts it into is different than the raw data on the card. BTR puts the data in N10:4. When I multiply what is in N10:4 by .07326 I get 132 and I have 50 PSI applied to the transducer.

Post your program so we can see how the card is configured. If you have more then one card tell us which one it is and tell us which channel it is.

Its .rsp file , zip it first.

If the card is configured for 0-4095 and your analog input is scaled 4-20ma = 0-300
then a 50 PSI input should give you about 683 counts (raw data value)
The card may not be configured for 0-4095.

Have you verified the milliamp signal is correct? Can you tell us what it is ? And what the raw data value is (N10:4)

Mickey,
I don't think you'll lose resolution...maybe granularity...
I have multiple similar setups running pretty accurately for many years.
1771-IFE/C 12 bit (0-4095)
4-20 mA -> 0-10000 PSI
Raw Min = 0
Raw Max = 9999
Works like a charm and is very accurate.

OK,
I figured out what I was doing wrong. The raw data on the card was in BCD and the N10: file was in two's compliment binary. I could set the N10: data table into BCD it read the same as the Analog card. But when I tried to Pull the data from the N10: into my multiply instruction it was still shoeing up in the two's complimentary binary. So I changed the input card to two's complimentary binary set min to 0 and max to 4095. Now Analog card and N10: file had the same info. I put in multiply function for N10:4 x .07326 and it worked great.
I also tried setting the min to 0 and max to 300 which did work but I chose to use the math instead for a learning experience and for better accuracy.
Thank you for all the help and I am sure I will be back again with more questions.

Good to hear and thanks for coming back with your solution.