Tags to read from PLCA or PLCB (topic change as old InTouch)

Ignition
1

Hi,

I’m trying to replicate old InTouch behaviour using topic change for tags depending on which PLC is connected.

I have two PLCs PLC_A and PLC_B. I wrote script with rolling counters between SCADA - PLCs which identify which PLC is a master and write other PLC_A or PLC_B to string tag called Topic.

Tags are exactly the same in both PLCs so I was thinking about creating generic tags in Ignition which can read from PLC_A or B thanks to changed topic. Is it possible to not address tags directly but to use my tag “topic” in a path so the tag will address to correct PLC?

Thanks in advance.

2

Is this an Ethernet device?

You could change the physical host name in the configuration through a scripting call:

system.device.setDeviceHostname | Ignition User Manual

I’ve used this to switch between an Emulator and a physical PLC that have identical tags.

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