6ES7422-1FH00-0AA0 - Digital Output Module - SIEMENS

SM 422 6ES7422-1FH00-0AA0 for SIMATIC S7-400, precise, safe AC digital outputs

The SIEMENS SM 422 digital output module, reference 6ES7422-1FH00-0AA0, is aimed at maintenance managers, automation engineers and system integrators who require reliable control of AC loads within SIMATIC S7-400 architectures. Its purpose is to provide 16 stable AC ON/OFF outputs to drive contactors, valves, indicator lights or other actuators powered at 120/230 V AC. Optical isolation and galvanic separation limit interference and protect the PLC from power disturbances. The operating range of 79 to 264 V AC covers a variety of supply situations, while the rated current of 2 A per channel provides a safety margin for most common industrial uses. Combining the robustness of the SIMATIC family with direct integration into S7-400 racks, this module is a proven solution to secure your digital outputs and keep your lines running.

Operational advantages for demanding processes

• 16 optically isolated digital outputs – Reduced coupling and improved immunity to interference for stable control of AC loads.
• Range 79 to 264 V AC – Suited to 120/230 V networks, useful in international environments and multi-standard sites.
• 2 A per channel – Sufficient capacity to directly drive many contactors, solenoid valves and industrial signalling devices.
• Native S7-400 compatibility – Fast integration into existing racks and simplified maintenance within the SIMATIC ecosystem.
• Galvanic separation – Protection for control circuits and improved long-term availability of installations.

Key specifications and build quality

The SM 422 6ES7422-1FH00-0AA0 is an AC digital output module designed for SIMATIC S7-400 PLCs. It offers 16 independent channels, each rated to switch loads at 120/230 V AC, with an operating range of 79 to 264 V AC. The output current per channel reaches 2 A, allowing direct control of a wide range of industrial actuators. Integrated optical isolation combined with galvanic separation between the control electronics and power circuits helps preserve signal integrity and reduce the impact of electrical transients. SIEMENS design, renowned for industrial robustness, favours stability, repeatability of switching and long service life. For modernization or preventive maintenance, this module integrates seamlessly into the S7-400 architecture and supports continuity of service.

Typical uses and applications

This module is suitable for controlling AC-powered equipment in automotive, food processing, intralogistics and chemical industries. Typical uses include driving motor contactors via relays, solenoid valves, light alarms and panel indicator lights, as well as managing non-critical safety devices that rely on AC digital outputs. In assembly or packaging lines, it helps ensure clean sequencing of actuators and smooth operation.

Differentiation, reliability and reassurance

Backed by SIEMENS expertise and the SIMATIC S7-400 ecosystem, the SM 422 6ES7422-1FH00-0AA0 focuses on reliability, isolation and system compatibility. To minimise production downtime, Standard Exchange Industry offers this module with complementary services tailored to field urgency. You benefit from a technical partner able to supply the correct reference quickly while managing obsolescence and standardisation constraints of PLC fleets.

Access our à la carte services with fast delivery in 24 to 72 h depending on stock and destination. Standard exchange, new or refurbished supply, or repair, our solutions are covered by a 6 to 24 month warranty depending on the service. Contact our experts to confirm S7-400 compatibility, optimise your maintenance plan and secure your AC digital outputs with the SM 422 6ES7422-1FH00-0AA0.