How do you implement chronological messaging with S7-400 CPUs and WinCC?

InstructionsThis entry shows you how to implement chronological messaging with an S7-400 CPU and WinCC. Chronological messaging means that the messages are sent from the PLC to the WinCC station. When they are created in the PLC, the messages are given a time stamp and then sent to the WinCC station. WinCC does not poll the PLC, which significantly reduces the bus load. The following two basic