Application of Mitsubishi Electric ALC System in Automobile Assembly Line
Mitsubishi Electric provides complete system solutions for the automotive industry. So far, many domestic automobile and engine manufacturers have adopted Mitsubishi Electric's system solutions, and have been well received by customers. The automobile assembly line of this example is built on the basis of a Mitsubishi Electric ALC system solution by a domestic automobile factory.
The assembly line consists of a body storage section, a chassis assembly section, a door assembly and delivery section, a final assembly section, a total power component assembly, an instrument panel total assembly section, and an engine assembly section. The electronic control system is based on the concept of Mitsubishi Electric's ALC (Automotive Production Line Management System). The overall system adopts the mode of “centralized supervision and decentralized control”. The whole system is divided into three layers, namely information layer, control layer and equipment layer.
The information layer consists of an operator station and an engineering station installed in the central control room. The connection is made by a common Ethernet and is realized by the Ethernet module installed on the MELSECNET/10 network master PLC and the PLCs of the device control layer. Data exchange. When necessary, the engineering station can be connected to the management's computer network so that the manager can view the required information in the office.
The control layer adopts MELSECNET/10 network of Mitsubishi Electric to connect 8 sets of Q series PLCs in each section of the assembly line (except the front bridge assembly section and the rear axle assembly section) to realize data sharing. It has high transmission speed (10Mbps), simple programming (no need for dedicated network commands), high reliability, easy maintenance, and large information capacity. The body storage section uses a Mitsubishi Electric A975GOT human-machine interface to connect via BUS (bus) to achieve on-site monitoring of the site information.
The equipment layer is CC-Link, which is hung on the PLC of the body storage section, the chassis assembly section, the door assembly storage section and the interior section. CC-Link is an open field bus that connects the sensors, pumps, valves, ID readers, inverters and remote I/O devices on the twisted pair to achieve decentralized control and centralized management.
