Modbus through Ac450 or Using OPC Server
In one of our project we used AC450 Controller and 800xA Industrial system.
we are going to send some signals from two energy meters via Modbus to our DCS, we have two possibilities:
1) using Modbus to AO converter and sending the signals (18 Analogue signals) to Analogue Board of AC450 Controller and then send it to Servers. unfortunetely there were no ABB modbus card there (CI532V02).
2) Using 3rd Party OPC client. first sending the Modbus signals to PC and then using the OPC for transferring the signals to 800xA.
Could you please tell me, which option is better?
Voted best answer
Define "Better" ....
- Do you need accuracy ?
- Is Cost a factor ?
- Is the data for display on the HMI or do you need to transfer it to the controller ?
- How reliable does it need to be ?
- Why can't you add a CI532 card ?
- Who's third party OPC client are you going to use ?
Whats "best" depends on your requirements.
we need transferring 18 signals via modbus and showing them in HMI. but it may be used in logic in future.
- The cost is too important.
-It should show the values of: voltage, current, frequency and power for emergency Diesel Generator.
- If we used WAGO modbus controller for converting the Modbus to AO, It would be 1/5 Price of CI532 and SC510 (the Carrier)
- I have to used a 3rd Party OPC system (request by owner)as an option and it is not selected yet. Our required OPC should received signal from MODBUS and send it to 800xA.
- At this point I want to compare the OPC and (MODbus to AO), I know that if I used the AI then I can use the signal in logic. But I want to know that how reliable is the OPC?
Base on above information, which option should be use?