Analog Output

Hi
When the flow meter's output is analog 4-20 mA and the flow rate has to be totalized, how is this achieved using a PLC?

You set up a periodic task or OB that executes at a known scan time, such as 1000ms.
Then each scan you capture the flow, convert it to gallons per minute for instance then add to a running total. This method assumes the flow rate is the same for 1000ms.

Assume 1 sec scan time:

Flow_Total:=(flow_rate/60)+Flow_Total