Simple calculations Compact HMI
I'm working on Compact HMI 800 system which only monitors pressure and flow in several nodes in a network of pipes. The customer have asked for virtual nodes where for example the actual flow is a differential flow from to real nodes.
Furthermore the customer want this virtual flow to be logged an available in trend curves. I guess I can use soft points but how?
The customer have also asked for some sort of calculator so he or she for example can add two flowrates together and subtract a third. One way to do would be to create templates such as mentioned above but then the operator can choose which flow to analyze from a list. Are there other ways to solve this?
Thanks for reading!
Voted best answer
If you calculate the differential flow using the calculation server and write the calculated value to a softpoint you can add a log configuration aspect to that softpoint to log the calculated value. It's also possible to perform the calculation using the PLC Connect Communication Server Pre-Treatment described in the PLC Connect Configuration manual.