Data Gathering from Three DCS Systems


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3 control rooms with 3 DCS systems (2 siemens PCS7 +1 Honeywell C-300) are existed. I want to read and display some parameters from one system (control room) to other systems (control room).

Which solution is better (especially reliability and then economic):

1) OPC server: such as Kepserver to launch data from each DCS and show them at other HMI?

2) ET (extended terminal): Duplicate each signal at Departure DCS (Hardware) and then read with an ET that should connected to destination DCS?

Missing data are important and profibus or profinet should be used for network protocol.