Siemens 6ES7131-4BD50-0AA0 SIMATIC DP 4DI, 24V DC, 15mm

The Siemens 6ES7131-4BD50-0AA0 is a 4-channel digital input module for the ET 200S distributed I/O system. It accepts source inputs (PNP) at 24 V DC, supplied from the power module on the terminal block. The module is 15 mm wide, fitting into a standard ET 200S slot, and ships in a pack of five. Each input draws approximately 7 mA at 24 V when active. Signal thresholds are defined as −5 to +30 V for a logic '0' and −15 to −30 V for a logic '1', consistent with Siemens source-input modules that sense negative-going signals. The module offers no parameterization or diagnostics; it is a pure pass-through interface. Rated current 500 mA from backplane bus, power loss 0.7 W. Cable lengths: 1 000 m shielded, 600 m unshielded. Switching times 2 ms min, 4.5 ms max, typically 3 ms.