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Download Free: OPC Tunnelling Increases Data Availability

OPC is built on Microsoft technology called COM, which stands for Component Object Model. It is a framework that defines how applications communicate with each other and share data. When OPC applications are installed on the same computer they use COM to exchange data. However, when installed on 2 separate PCs, then the COM messages are wrapped in a Microsoft security layer called DCOM (Distributed COM).

Most OPC configurations involve the use of DCOM. There are circumstances where DCOM can experience timeouts that can lead to unreliable data delivery and even data loss. Such circumstances can include:

  • Hardware problems, such as a faulty network card, router or switch
  • System issues, such as an overloaded network
  • Inherently unstable network architectures that use satellite links, WAN, radio communication, etc.

It should be noted that most networks, even reliable ones, suffer from these problems from time to time.

OPC Tunnelling provides an alternative approach that eliminates the DCOM risk altogether. This technology uses standards-based TCP/IP communications instead of DCOM for carrying OPC messages. It provides users with configurable timeouts that are appropriate for the specific installation.

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