Node-RED Siemens S7 PLC Communication

node-red-contrib-s7comm is a Node-RED package designed to facilitate communication with Siemens SIMATIC S7-300, S7-1200, and S7-1500 PLCs. It leverages the RFC1006 (ISO-on-TCP) communication protocol, enabling users to read from and write to specific PLC addresses using various S7 data types. The current stable version is 1.1.6. As a Node-RED contribution node, its release cadence is typically driven by community contributions and updates to its underlying `nodeS7` library, which handles the core PLC communication. Key differentiators include its integration into the Node-RED flow-based programming environment, simplifying the creation of HMI, SCADA, or IIoT applications that interact with Siemens PLCs without requiring extensive low-level protocol knowledge. It abstracts the complexities of the S7comm protocol behind user-friendly Node-RED nodes.