Modbus communication to DCS historical trends?
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The on-site PLC communicates with the DCS system, with the PLC acting as the slave station and the DCS as the master station. Now, I would like to view the historical trends of these communication points in DCS. Is that possible? What software and hardware combinations are required in PLCs and DCS?
Different DCS and PLC systems have different configurations, so asking a question like this is equivalent to not asking anything at all.
Of course it’s possible; only by specifying which manufacturer’s equipment it is can we determine exactly how to proceed
PLC: Siemens, DCS: Honeywell. I mainly want to know whether it is possible to view historical trends for data transmitted from Modbus to the DCS.
Otherwise, what’s the use of communication?
Otherwise, what’s the use of communication?
Then it must be possible to see the trends; otherwise, the value of DCS is **discounted**
Yes, DCS comes with this function; any instrument that can communicate can be used.
It’s possible to do it; as long as you get into DCS, you can do it.
Yeah, just treat it as an AI point – you can simply use its address to create a trend module!
It can be achieved. The communicating parties need to determine the communication protocol and related parameters, as well as the addresses and meanings of the data in their respective devices. For the Modbus RTU protocol, it is necessary to determine parameters such as the slave address and communication rate, as well as the locations where the data is stored on both sides and the data types. After the DCS obtains the data, it processes the real-time or historical trends in the same manner as conventional 4–20mA field data acquisition.