Tags register address

Hi,

I have a question regarding the way we set tag values in Ignition.
I noticed that every group of tags, when we set the register address,beside the number it has different letter on prefix. (see bellow)



Here it’s the list with registers addresses:

How we can know what letter to put on preffix, if the list we get from PLC programmer contains only number for registers?

Thank you!

This may help explain things:

https://docs.inductiveautomation.com/display/DOC79/Modbus+Addressing

1 Like

Thanks!