Available. TS10-421-8MA12. The Siemens 6ES5 421-8MA12 is a digital input module designed for the SIMATIC S5 series programmable logic controllers (PLCs). This module features eight non-isolated digital inputs operating at 24 V DC, making it suitable for applications where electrical isolation between channels is not required. It is compatible with Siemens S5-90U, S5-95U, S5-100U, ET 100U, and ET 200U PLC systems. The module is ideal for integrating digital signals from field devices such as sensors and switches into automation systems. Key characteristics include a rated voltage of 24 V DC, a signal voltage range of 13 to 33 V for '1' signals and 0 to 5 V for '0' signals, and an input current of approximately 7 mA at a '1' signal. The inherent delay times are approximately 2.3 ms for '0' to '1' transitions and 3.5 ms for '1' to '0' transitions. The module supports cable lengths up to 100 meters for unshielded cables. Its power consumption is approximately 0.8 W, and it has dimensions of 111 x 142 x 58 mm, with a weight of 190 g.