6ES7422-1BH11-0AA0 - Digital Output Module - SIEMENS

SM 422 SIEMENS 6ES7422-1BH11-0AA0, reliable 16x24 V DC digital outputs for S7-400

Designed for SIMATIC S7-400 PLCs, the SIEMENS SM 422 module, reference 6ES7422-1BH11-0AA0, provides 16 transistor on/off outputs, 24 V DC, 2 A per output with galvanic isolation. This module is aimed at maintenance managers, automation engineers and integrators who require precise and repeatable control of actuators in industrial environments. It addresses output reliability, resistance to disturbances and the standardisation of stocked parts. The 24 V DC and 2 A per channel combination allows direct driving of a wide range of solenoid valves, auxiliary contactors, indicator lights or digitally controlled devices while minimising additional interface components. Integration into the S7-400 chassis ensures mechanical and logical compatibility with SIEMENS standards, with a compact footprint of 295 x 233 x 38 mm and a weight of 0.77 kg for easier rack installation.

Robust outputs and controlled switching, focused on operational efficiency

• 16 digital (on/off) outputs 24 V DC – Cover most discrete actuator control needs, simplify engineering and reduce the number of cards required.
• 2 A per output – Current capacity suited to common inductive loads, reducing the need for intermediate relays and decreasing potential failure points.
• Transistor – Precise, consistent switching suited to high duty cycles without mechanical contact wear.
• Galvanic isolation – Reduces parasitic coupling, improves immunity to disturbances and protects the CPU and other modules.
• S7-400 integration – Proven compatibility within SIEMENS architectures, simplified maintenance and continuity of service in critical environments.

Technical specifications and build quality

The SM 422 6ES7422-1BH11-0AA0 delivers 16 transistor digital outputs at 24 V DC, each rated at 2 A. The built-in galvanic isolation helps separate the output circuits from sensitive parts, enhancing the overall robustness of the installation. The dimensions of 295 x 233 x 38 mm and weight of 0.77 kg ease integration into an existing S7-400 chassis, providing clear space management in cabinets. The module is part of the SIMATIC S7-400 family, recognised for industrial durability and long-term applicability. The EAN 4019169043045 and country of origin Germany attest to traceability and manufacturing origin. All information presented is based on the manufacturer's specifications. This configuration meets process constraints where continuous load control and immunity to disturbances must be maintained without compromising output signal repeatability.

Target uses and application contexts

The module targets assembly lines, packaging installations, intralogistics, special machines and continuous processes requiring 24 V DC outputs. It effectively drives solenoid valves, indicator lights, auxiliary contactors or DC actuators in robot cells and workstation islands. Maintenance teams and integrators benefit from a standardised solution for rapid replacement across S7-400 fleets while maintaining consistent performance in demanding industrial environments.

SIEMENS reliability and operational reassurance

The reputation of the SIMATIC S7-400 platform and the SM 422 design ensure stable integration with predictable long-term behaviour. The transistor architecture reduces wear associated with switching, galvanic isolation enhances functional safety of the whole system and hardware compatibility minimises the risk of mismatch during planned maintenance. For sites with availability constraints, these advantages translate into fewer unplanned stoppages and streamlined maintenance.

Available via Standard Exchange Industry as exchange units, new or refurbished supply, and repair service, this module can be shipped within 24 to 72 h depending on stock. Benefit from B2B technical support, warranties from 6 to 24 months depending on service and logistics adapted to line shutdowns. Submit your request now, we help secure your 24 V DC outputs and maintain your performance on SIMATIC S7-400.