Scaling Data on Flex 1794-IF4I Analog Card

[Ones_Zeros]

Hello,
I have a Flex 1794-IF4I analog input card
that I'm needing to read data from a pressure transmitter.

I think I may have a scaling issue because the readout out on the transmitter
is not what I'm seeing in my PLC (SCP) instruction.

I haven't had any issues scaling any of these in my
regular compact logic programs.

Here is how i have the SCP function setup to scale this transmitter
1. The actual card configuration is set to 4-20ma on each channel

2. I have the SCP function scaling the transmitter in the PLC rather than doing it in Wonderware.

3. In the SCP instruction, I have the following:
Input_Min = 4000
Input_Max = 20000
Scaled_Min = -250
Scaled_Max = +250

I'm reading data but the data is not correct according to the value on the transmitter.
I'm reading high in my PLC, somewhere around say -120 like
I have it currently scaled and the
transmitter is showing something like -71. Its constantly changing
so thats a rough value of the difference

Again, I've not worked with the FLEX IO cards much so I thought I would check with you guys to see what my problem is

Thanks alot

 

[Mickey]

"Data Format"
How is the card configured?

See pdf

 

[Ones_Zeros]

This is how I have the card configured
Data Format = 4-20ma (Signed 2's Complement)


Does this seem right?
Thanks

 

[Mickey]

This is how I have the card configured
Data Format = 4-20ma (Signed 2's Complement)


Does this seem right?
Thanks

If you have configured the card for that then the raw data values are..

4ma = 0000
20ma = 30840

 

[travispedley]

looks like maybe the scaling should be

0
30840
-250
+250

 

[Ones_Zeros]

OK thanks I will give this a try
I appreciate your help with this!!

 

[Ones_Zeros]

That worked thats for helping
I appreciate it!!