3 Methods for Sharing Data from an IIoT PLC

Submitted on Fri, 05/28/2021
Historically, PLCs shared their data using methods such as…
  • Write data to memory card.  Maybe then FTP that file to a network location.
  • Data tags were read by an HMI, SCADA, Historian, DCS, or some other higher-level software that wrote the data into a database.
Those capabilities still exist.  But now there are other options as well…


Write Directly to an SQL Database

3 Methods for Sharing Data from an IIoT PLC


This eliminates the need for the typical middleware computer and still retains the ability to write to the database every 20 ms.


Set Up A Server For Publishers and Subscribers Using MQTT’S PUB/SUB Model

Subscribers can select which data they want to receive…
3 Methods for Sharing Data from an IIoT PLC
This greatly reduces the amount of network traffic and data storage when it is flowing between multiple points…
3 Methods for Sharing Data from an IIoT PLC


Use the More Traditional Client/Server, But Secure, Model Using OPC-UA

3 Methods for Sharing Data from an IIoT PLC
Multiple Clients can still request data from a single Server, but that requires more processing power and creates more traffic on the network than the MQTT pub/sub model.
3 Methods for Sharing Data from an IIoT PLC
OPC-UA uses security certificates to authenticate and build trust.
3 Methods for Sharing Data from an IIoT PLC
Learn more: “A Variety of Ways to Share Data for IIoT Applications”


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