Totolizer (RSLogix TOT Instruction)

[wanher3]

Hello,

What's the working principle of a totalizer and how can the TOT instruction in RSLogix be used to calculate or accumulate Flow ?

Thanks

 

[bernie_carlton]

It actually uses a flow value to calculate a total by sampling the slow value at specific intervals and adding to the total value.

 

[wanher3]

It actually uses a flow value to calculate a total by sampling the slow value at specific intervals and adding to the total value.

But how's that accomplished using the TOT instruction ?

 

[jkerekes]

It integrates the flow over time by adding together the instantaneous flow.

 

[wanher3]

It integrates the flow over time by adding together the instantaneous flow.

I understand the theory. My question is how is the TOT instruction set up in other to accomplish this ?

 

[bernie_carlton]

Just a note that the TOT instruction is not available in Ladder, just Function Block and Structured Text.


Here is a link to the manual containing the description of the instruction, https://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1756-rm006_-en-p.pdf