Phoenix Contact 2967141 A PLC interface assembly consisting of a PLC-BSC module and a 21 basic terminal block attached to a DIN rail, typically mounted using screw connections. The terminal block features plug-in miniature relays with multi-layer gold contacts for reliable connections. Two changeover contacts are integrated into the design, allowing for versatile configuration options. The interface supports both AC and DC power inputs, accommodating either 230V AC or 220V DC voltages.