Mitsubishi PLCs use several communication protocols to exchange data with other devices and systems efficiently. The primary protocol is the proprietary MELSEC (MC) Communication Protocol, designed for data exchange between MELSEC PLCs and external devices like PCs or HMIs. It uses a frame-based structure to send commands and data reliably. For modern Ethernet-based connections, Mitsubishi supports SLMP (Simple Link Module Protocol), which standardizes communication between MELSEC controllers and external systems. This makes it easier to integrate Mitsubishi PLCs into larger automation networks.
Apart from MC and SLMP, Mitsubishi PLCs also support CC-Link, a network protocol for factory automation, and Modbus TCP/IP for Ethernet-based communication with Modbus-compatible devices. Some models support OPC UA, which allows XML-based web service communication for industrial data exchange. When selecting a protocol, consider factors like communication distance, speed, real-time requirements, and device compatibility. Using the right protocol ensures Mitsubishi PLCs communicate efficiently, integrate smoothly with other devices, and meet the needs of both simple and complex industrial automation systems. These protocols make Mitsubishi PLCs versatile and reliable for modern manufacturing and industrial processes.