Ethernet-based redundancy control system and control method

The invention discloses an Ethernet-based redundancy control system and a control method. The redundancy control system comprises an upper system, a control system and an execution system. The upper system comprises two industrial personal computers. A configuration software is installed on each of the industrial personal computers. The industrial personal computers form a local area network via a standard network card. The control system comprises two sets of PLC systems. Each of the PLC systems comprises a power supplying module, a redundancy CPU and an Ethernet communication module used for redundancy CPU communication. The redundancy CPUs in the PLC systems are connected via an optical fiber. The industrial personal computers are connected with the PLC systems via a switch and communicate with the Ethernet communication module via switches. The execution system comprises multiple I/O modules and multiple execution units. The PLC systems are separately connected with the I/O modules via Profibus-DP buses. The I/O modules are connected with the execution units. According to the invention, via the on-line real-time monitoring is performed via the industrial personal computers, and the PLC systems work concurrently, so safety, reliability and stability of operation of the system are greatly improved.