Pylogix and class 1 connections
A few times a year I'm asked about class 1 connection ability with pylogix. Typically, I respond simply that pylogix doesn't make class 1 connections and I don't plan on supporting them. Purely as a technical challenge, I have experimented in this space but I never really saw class 1 connection support as something useful to most people. A few have made their case, only one was compelling. I'll do my best to lay out my thoughts. What is a class 1 connection Simply put, I/O connections. Anything that gets added to the Logix tree uses a class 1 connection. Devices communicate at a predictable rate, at the RPI specified. When a device is added to the tree, there are a number of properties, including IP address, number of input words, output words, etc. The controller will reach out to the target device, sending these connection parameters. The target device responds agreeing to the terms, the two devices switch over to UDP and exchange their data at the specified
