Miguel (Customer) asked a question.
I need to prepare a system but i selected P1-04ADL-1 Input Module, 4 channel 0-20 mA, but my P1-04DAL-1 Output Module 4 channel is 4-20 mA. As in the program we can change the register so that they are both 4-20mA, because all my equipment's are 4-20mA.
I would not like to use a 250Ω resistor and put it in parallel. Can you make a 4-20mA input card ?
Scaling will allow one to use a 4-20 source with a 0-20 input, and having a 0-20 input allows the option to check for an open sensor. Some fixed 4-20 inputs (e.g. the older CLICK built-in) give the same reading for an open circuit as they do for 4mA which removes one of the advantages of 4-20.
Thanks !!!
What @Tinker (Customer) said is correct. Also of note when you are using the scale linear instruction you will also need to compensate for resolution as the output card is 12 bit and the input card is 13 bit
Thanks!!!
How can I compensate the resolution of 12 @ 13 ?
When scaling the input, your raw input will be 1638(4mA) to 8191(20mA). When scaling the output your raw output will be 819 to 4095
Thanks !!!
How can I compensate for this difference of 0-20mA @ 4-20mA?
You don't need to do anything. A 0-20mA input will read a 4-20mA device the same as a 4-20mA input would. On a 13bit input, 4mA is still approximately 1638.
Thanks !!!