6ES7422-5EH00-0AB0 - Digital Output Module - SIEMENS

SIEMENS SM 422, 16 relay outputs 6ES7422-5EH00-0AB0, reliable control of AC and DC loads

Designed for SIMATIC S7-400 automation architectures, the SM 422 digital output module, part number 6ES7422-5EH00-0AB0, is aimed at maintenance teams, system integrators and OEMs who need to drive heterogeneous industrial actuators while ensuring availability and safety. Its 16 on/off relay outputs allow direct switching of AC loads up to 250 V, 5 A, or DC loads from 24 to 125 V, in most cases without additional interface. Galvanic isolation between the PLC logic and the field helps protect equipment and control interference. For new installations as well as replacement or modernization operations, this module stands out for its versatility, native compatibility with the S7-400 platform and resilience to industrial constraints. You get a proven, ready-to-use component that helps reduce downtime and secure your production cycles.

Operational value, service continuity and flexibility

• AC and DC switching versatility – The relay outputs permit control of contactors, valves, indicator lights, solenoids and other actuators on alternating or direct current for simplified integration.
• Protection by galvanic isolation – Electrical separation between control and field limits leakage currents and unwanted coupling, improving system availability.
• Immediate integration into S7-400 – Direct compatibility with the SIMATIC S7-400 family, easing standardization of your control cabinets and maintenance of installed equipment.
• Reduction of external interfaces – Relay switching can often eliminate the need for intermediate relays, reducing wiring, footprint and potential failure points.
• Industrial robustness – Designed to withstand workshop and installation constraints, with endurance for inductive loads common in production environments.

Key features and build quality

The SM 422 6ES7422-5EH00-0AB0 provides 16 relay digital outputs for on/off applications. It is rated to switch loads up to 250 V AC and 5 A, and DC loads between 24 and 125 V. Relay technology offers inherent galvanic isolation of channels, reinforcing functional safety and compatibility with various types of receivers. The module integrates into a SIMATIC S7-400 system and mounts in a control cabinet on DIN rail, in line with common industrial practice. The unit sits within the SIEMENS ecosystem, known for platform stability and component longevity. The selected features target efficiency and ease of use, particularly for like-for-like replacements, retrofits or standardization of existing production islands. Choosing a relay module also provides increased tolerance to inductive loads, typical of electromechanical actuators.

Typical applications and use cases

The SM 422 is suited to automated production lines, conveyors, packaging machines, water treatment processes, industrial utilities or HVAC applications. Maintenance teams use it to secure control of contactors, solenoid valves or signal lights when mixed AC and DC voltages coexist. Integrators value its native S7-400 compatibility and reliable handling of inductive loads, which simplifies project design and reduces the need for additional interfaces.

Risk management and technical reassurance

Backed by SIEMENS expertise, this module benefits from rigorous design and assured compatibility with the SIMATIC S7-400 ecosystem. Standard Exchange Industry supports you across the entire lifecycle with three complementary approaches: new or reconditioned hardware, exchange service for rapid restart, and repair when total cost optimization is a priority. Our processes focus on reliability and service continuity, with short lead times and warranties from 6 to 24 months depending on the chosen service. You secure your production while controlling MRO costs and restart timelines.

Speed up your maintenance with fast availability and B2B technical support. Request a quote for the SM 422 6ES7422-5EH00-0AB0 SIEMENS and secure the control of your AC and DC loads on SIMATIC S7-400.