1.CPU304 PLC controller 2.Input Power:AC85~265V 3.I/O:Input 8, ... ): 300 bytesInternal storage area (M area): 32 bytesData Retention CharacteristicConfigure with the programming software: V area, C (counter) areaRetention Mode and ... ;Supported working modes: Programming, Modbus-RTU (slave), Free protocolEquipment Connected with COM PortRS232/RS485: PC (for programming), third-party HMI panel ...