HMI Connection Manual for Siemens S7-300 (ISO TCP)

This document provides technical specifications for connecting an HMI (Human Machine Interface) to a Siemens S7-300 PLC using the ISO TCP protocol, including factory settings, IP address configuration, and communication parameters. It details the definitions and formats for PLC read/write addresses, covering registers, contacts, data types, and ranges for inputs, outputs, internal bits, data blocks, timers, and counters, along with important notes on byte ordering and data length usage.