Hi @MelSick, developer of the node you're using here
It's not clear to me what your issue is, but since you're connecting to a S7-1500 PLC, I'd recomend you to check the notes regarding 1200/1500 series. Basically make sure to enable the bits on the PLC, so that Node-RED is able to access the memory areas you want. Also make sure you're getting the Rack and Slot parameters right, as it should be in your PLC project's configuration.
If you still can't make it work, please share with us the flow you have setup, and what kind of errors you're having and/or the Node-RED logs.
P.S.: Welcome to the Node-RED forum!
