Reading several tags as one telegram

Ignition
1

I am new to Ignition (but have been through all the online training material), have worked with e.g. Aveva Wonderware for several years.

We have a usecase, where I have to read e.g. 25 tags in one block, they consists of one telegram, that I need to interpret in a certain way and move the data to the appropriate location in my Ignition UNS. E.g. when a trigger is raised, I need to read my telegram, because I then know that is has been updated appropriate from my PLC code.

Can I do something similar in Ignition ? Mostly with Siemens PLCs but also AB

2

If you mean this needs to be a single message between Ignition and the PLC, then yes, you can do this with system.opc.readValues(), which bypasses the Ignition tag system.

For it to truly be a single request, you typically must place all of the values in a single structured tag (Logix) or single data block (Siemens). This is what permits all of the PLC items to be optimized by the driver into a single operation.