OPC Classic Server Sink block

The OPC Classic Server Sink block makes Architect fields available as OPC Classic items in the OPC Classic server.

Note that this connector may or may not be available on the user palette, according to your license type.

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OPC Classic Server Sink block

Description

The data of an OPC Classic server is identified by means of OPC Classic item identities (IDs). Each OPC Classic server vendor must provide a mechanism external to the OPC Classic specification to define items in the OPC Classic server. Architect uses the OPC Classic Server Sink block to make items available in the OPC Classic server. (The OPC Classic Server Sink and Classic Server Source blocks are the only two blocks an Architect blueprint to which you can publish tags.)

NOTE: The OPC Classic Server Sink blocks makes OPC Classic items available that are only readable, while the OPC Classic items of a OPC Classic Server Source block are readable and writable.

diagram showing the OPC Classic Server sink block

Block Type

Input/Output block

Input/Output ports

The block has 1 input port that can accept any type of field.

Functions performed on tags

The block performs no operations on the fields in the input port when the blueprint is executed. When the blueprint is started the input fields are made available as OPC Classic items in the OPC Classic server. Not only are the fields made available in the OPC Classic server as OPC Classic items but the block also creates an OPC Classic public group in the server. The public group contains all the fields in the port. OPC Classic clients that can work with OPC Classic public groups can quickly be configured by connecting directly to the public group. The name of the public group is entered in the block's user interface.

The OPC Classic item id of an input field is as follows:

IO/groupname/fieldname

  • IO/ is a fix part

  • groupname is configured through the block's user interface

  • fieldname is the name of the input field

Example

An OPC Classic server sink with the group name configured as "Flow xyz" and input fields SetPoint, HiLimit and LowLimit will create the following OPC Classic elements:

  • OPC Classic Item ids

    • IO/Flow xyz/SetPoint

    • IO/Flow xyz/HiLimit

    • IO/Flow xyz/LoLimit

  • Public Groups

    • Flow xyz

  • Public Group Items

    • SetPoint

    • HiLimit

    • LowLimit

 

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CSense 2023- Last updated: June 24,2025
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