1746-NI16I question

Hello everyone,

I'm working on a converting SLC to ControlLogix project. I have a question about 1746-NI16I card.
The AI card is Class 3 configuration. The configuration word for the first 8-channels is -30640 (2's complement binary number: 1000 0110 1100 0000). The second 8-channels is -32688 (1000 0000 0101 0000). The RS 500 program has a scale routine to do the convertion.
The new Controllogix system will use 1756-IF16 to replace the 1746-NI16I. I was wondering if I can delete the scale routine by using the configuration of 1756-IF16.
For example, channel 0 (I:7:0) scales 0-2000 GPM. RS500 uses SCP instruction( Input Min. 0; Input Max. 16383; Scaled Min. 0; Scaled Max. 2000).
1756-IF16 configuration ( 0 - 20mA; 0 - 2000 engineering unit)

Any suggestion?

The attached file is the scaling routine.

Thanks,

Eric

That is the best way to do it. Scaling on the Input module relieves the processor of doing this task.

Also you can use the module's process alarms HH, H, L, & LL, and the rate alarm if you wish.

It's such a shame the module doesn't have deviation alarms, that would totally complete the majority of requirements for analog handling.

Hi daba,

Very appreciate your suggestion.