Question

Is there any way to define a single Item to address a block of V-memory within DSDATA?

Answer

Unfortunately this is not possible with DS Data and the ECOM. It was an engineering decision given the then pros and cons. There must be a one-to-one correspondence between PLC data types and OPC/DDE reference types. So the problem begins with the fact that there's no block (or array) data type in the Direct Logic (DL) PLCs sold by Automation Direct. Without this data type in the PLC, there's no way for any DDE/OPC client to create an Item that can reference a range of data in the PLC.

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FAQ Subcategory: None

This item was last updated on 2003-08-28
Document ID: 970

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