The Ethernet supports the Modbus TCP/IP protocol, 2 RS485 ports, supports Modbus RTU and free port communication protocols USB download port, can download and monitor the PLC from any communication port; the Ethernet host supports 4 high-speed pulse outputs, can expand up to 64 expansion modules, the expansion modules can run programs independently, the front supports 2 plug-in expansions, and can arbitrarily combine digital, analog, and temperature modules