rta53
Lifetime Supporting Member
OK, I apologize up front for having to ask about this. I am still learning to deal with the transition from Logix 500 to 5000. There is no module scaling for the 1769-IF8. It has to be done in 5000. I have been using the SCP instruction in SLCs but of course 5000 does not have this. In PLC5s I used the formula (X|4095)*100 in a CPT instruction if I wanted to scale my input 0 to 100. This was easy because the raw data was 0-4095. But if I use raw data in the IF8 for a 4-20mA input it is -32767 to +32767 where 4mA is about -29800 and 20mA is around 28900. If I use Engineering Units it is of course 4000 to 20000. What math do I use to scale these ranges say to a range of 0 to 150?