expansion module: warranty : 2 years; binary input, connected to common potential: 0.0; binary input, not connected to common potential: 8. 0; terminal A, mounting position 1: current 4x protection; Ethernet electrical ETH-BA-2E L: 0; Ethernet optical ETH-BB-2FO: 0; rated frequency terminal: 50 Hz / 60 Hz; rated frequency terminal slot 01: 50 Hz / 60 Hz; front design: USA; high-speed relay, NO contact: 0.0; housing type: flush mounting; interface USART-AB-1EL: 0