Innovative Partner for Automation

Bihl+Wiedemann is a mid-size owner-operated company founded in 1992 by Jochen Bihl and Bernhard Wiedemann in Mannheim, Germany. We develop and manufacture complete automation solutions for functional safety and for data communication in machines and plants. Our products are in use worldwide across diverse sectors, by leading manufacturers of consumer and capital goods.


Primarily, we want to be an innovative partner for our customers: using our development expertise to meet individual requirements.


Leading the Way with AS-Interface Since 1995

Bihl+Wiedemann is a leader in the field of automation and safety technology with AS-Interface (ASi). We played an important role in the development of each ASi generation. Our ASi Master was the first such system to be awarded a certificate in 1995 from AS-International e.V., the ASi organization with 300 national and international partners. We also played a pioneering role in the market launch of ASi-5 devices in 2019. The latest ASi generation now allows larger data volumes to be transmitted much faster. We have been among the leading providers in the area of functional safety using ASi Safety at Work for almost 15 years.


Our complete ASi product portfolio covers Master/Gateways, Modules/Slaves, Safety Components, Bus Couplers/Master Simulators as well as in-house developed software.

Jochen Bihl and Bernhard Wiedemann


International Subsidiaries and Sales Partners

A combination of innovative strength and long-standing customer relationships has enabled us to grow continuously for many years. In addition to our headquarters in Mannheim, Bihl+Wiedemann owns subsidiaries in the USA, China, Turkey, Denmark and Spain. We are now also represented by international sales partners in more than 30 countries.

We are committed to environmental and climate protection

Reducing CO₂ emissions is more important than ever today. Since 2010, we have been covering our energy needs with our own solar cells as far as possible. Three solar plants with a total output of 270 kWp generate 174,000 kWh of electricity per year (2022). And the energy company of our choice, MVV Energie in Mannheim, will even be one of the first in Germany to be climate positive, i.e. it will remove more CO₂ from the atmosphere than it emits.


The number of hybrid or electric vehicles in our fleet is also increasing rapidly and steadily. The first electric vehicles have been in use at our company since 2019. We also use an energy management system according to ISO 5001 and an environmental management system according to ISO 14001 to continuously improve our energy efficiency and environmental protection.


Learn more about sustainability at Bihl+Wiedemann and why AS-Interface is an environmentally friendly and resource-saving technology.


More about environmental responsibility and decarbonization

of solar cells are in operation at the Mannheim headquarters on the roofs and facades of our office and production building – the first ones since September 2010.


of power we expect to generate from 2023. This corresponds to the annual consumption of 1,500 large refrigerators with freezer compartments.


of our vehicle fleet are already hybrid or electric vehicles. Bihl+Wiedemann employees can use solar power at 22 charging stations.



Technological Principles


AS-Interface (ASi) is a globally standardized fieldbus system for the first level of automation. ASi connects sensors and actuators with a controller via a single two-conductor profile cable. The yellow ASi cable transmits power and data at the same time. The main benefits of ASi are, among others, dramatically less wiring, free choice of topology and cost-efficient integration of safety on the same infrastructure. The latest ASi-5 generation can now handle larger data volumes at much higher transmission speeds and it enables intelligent sensors such as IO-Link to be integrated with ease.


More about the AS-Interface

ASi Safety at Work

Safety-related aspects play an important role in an increasing number of automation solutions, especially where hazardous movements pose a safety risk to humans. Regulations in this regard are set out, for instance, in the EU Machinery Directive (Directive 2006/42/EC) or in the occupational safety regulations of the respective countries. Thanks to the Safety at Work concept of the AS-Interface, safety-related components, such as safe sensors and actuators as well as safety monitors, can be seamlessly integrated into almost all commonly used automation systems.


More about ASi Safety at Work

What sets Bihl+Wiedemann apart

Triple ISO certified

Quality management (ISO 9001)

Environmental mgmt (ISO 50001)
Energy management (ISO 14001)

The AS-Interface Masters

Professional partner for AS-Interface solutions.

Personal expert

Available in person at
any time.

Customized product solutions

Realization of specific automation solutions.

Certified as per DIN EN ISO 9001

Since 2005 we have a quality management system that complies with ISO 9001. It creates transparent processes and forms the basis for continuous improvements in all areas of the company.


Our current certificate for download (PDF) 

Certified as per DIN EN ISO 14001

Since 2021 we have an environmental management system that complies with ISO 14001. It defines clear environmental goals, ensures sustainable use of resources, and is key to eliminating environmentally hazardous weaknesses.


Our current certificate for download (PDF) 

Certified as per DIN EN ISO 50001

Since 2021 we have an energy management system that complies with ISO 5001. It helps us to systematically optimize energy efficiency and reduce CO₂ emissions step by step.


Our current certificate for download (pdf)