Mitsubishi FX3S PLC CPU, Ethernet, ModBus Networking Mini USB B Interface, 4000 Steps Program Capacity. For Use With: FX3 Series. Number of I/O: 20. Number of Inputs: 12 (Sink/Source). Input Type: Sink/Source. Voltage Category: 24 V dc. Output Type: Relay. Number of Outputs: 8 (Relay). Communication Port Type: RS422, USB. Memory: 16000 (EEPROM) steps. Number of Communication Ports: 2. Minimum Operating Temperature: 0°C. MPN: FX3S-20MR-DS