Ones_Zeros
Member
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
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