PLC and HMI question...
PLC and HMI question...
(OP)
Hello
I am using a Rievtech PLC and a Wecon HMI to log data for a customer I am making an automated test rig for. the issue is that I am trying to use their existing pressure, flow and power transducers that are already powered to obtain an input to the PLC. The Reivetech (PR-18dc-da-r) has a common ground (-ive) connection that clearly these transducers dont share. Infact the input power to the transducers is not the same as the supply to the Rievtech PLC. I am confused how this can be wired up to use the 0-10V output from the transducers in this case. any help would be greatly appreciated.
The other question i have is with the HMD. Its a Wecon 700E. WHat I need is to show the instantaneous performance point on a graph (which is no problem) however I would like this displayed next to the expected performance in pressure and flow. I can not see how I can use a table of data or table or readings to generate a cureve on this HMI. again, any advise on this would be amazing.
Many thanks
David
I am using a Rievtech PLC and a Wecon HMI to log data for a customer I am making an automated test rig for. the issue is that I am trying to use their existing pressure, flow and power transducers that are already powered to obtain an input to the PLC. The Reivetech (PR-18dc-da-r) has a common ground (-ive) connection that clearly these transducers dont share. Infact the input power to the transducers is not the same as the supply to the Rievtech PLC. I am confused how this can be wired up to use the 0-10V output from the transducers in this case. any help would be greatly appreciated.
The other question i have is with the HMD. Its a Wecon 700E. WHat I need is to show the instantaneous performance point on a graph (which is no problem) however I would like this displayed next to the expected performance in pressure and flow. I can not see how I can use a table of data or table or readings to generate a cureve on this HMI. again, any advise on this would be amazing.
Many thanks
David





RE: PLC and HMI question...
Most isolators are single channel, but there are two channel models available. Here's a link to a variety.
https://api-usa.com/4380.php
Wire the source voltage signal in parallel to the input of the isolator and then wire the isolator's voltage output signal to the Rievtech PLC AI.
I can't help you with the HMI graph/chart/trend, but I'd search for each of the those terms in the HMI documentation.
RE: PLC and HMI question...
That is really helpful thank you. I have an ANU device that i am using to simulate a 0-10 signal for my testing. The ANU has an auto mode that takes an input and then relays the signal. the only issue is it still uses a common ground so I guess what you are suggesting is essentially what I have in the ANU but with comletely different input and outputs.
Thanks for the info... I now konw what to look for :)
RE: PLC and HMI question...
After re-reading your issue with expected performance, I doubt my suggestion will help. Trend and chart are typically terms for display of logged data values over time (Y-t). It appears that you need to find an expected performance value from a temperature vs pressure table.