PLC 5 analog input scaling question

Hello everyone,

I have a plc 5 input card receiving an input from a conductivity
Transmitter where 0ma=0 uhms and 20ma= 20,000 uhms
The raw min is 0 and Max is 4095, I’m not very familiar with plc 5 but I understand there’s no SCP option.

What would be the best way of scaling this in the ladder logic.

20,000 / 4095 = 4.884 or .0049ma per count. So the value from the block transfer read would be multiplied by 4.9 to scale it to about 0-20,000.
The card has to be setup for 0-20 ma. I have mostly seen the cards used for 4-20 so check that first.
https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1771-um663_-en-p.pdf

Remrun said:

20,000 / 4095 = 4.884 or .0049ma per count. So the value from the block transfer read would be multiplied by 4.9 to scale it to about 0-20,000.
The card has to be setup for 0-20 ma. I have mostly seen the cards used for 4-20 so check that first.
https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1771-um663_-en-p.pdf

Click to expand...

Great, thanks.