Sercos Fieldbus system
What is Sercos?
Sercos (Serial real-time communication system) is an open, manufacturer-independent fieldbus standard that is used in industrial automation. As an IEC-standardized open interface, Sercos enables serial high-speed real-time communication without special interface adaptations – e.g. between industrial controllers, motion devices, inputs and outputs, other peripheral devices and standard Ethernet nodes. Sercos is often used in demanding applications with high requirements for dynamics and precision.
![[Translate to Englisch:] Sercos](/fileadmin/_processed_/d/e/csm_sercos_1__9296e82223.webp "[Translate to Englisch:] Sercos")
Safety, Sercos ASi Gateways
The certified ASi Sercos Gateways with integrated safety monitor provide an interface for a Sercos fieldbus. These ASi gateways are available in various versions with IP20 protection rating. All gateways feature Safe Link technology, which makes it possible to connect different parts of the system easily and flexibly. They all also have an Ethernet diagnostic interface for convenient diagnostics. They also include an OPC UA server, which can be used to transfer all process data and additional information to the IT world.
Safety, Sercos ASi
| Figure | Model | Communication interface between fieldbus and gateway: interfaces for standardized fieldbus systems in industrial automation. Bihl+Wiedemann offers a wide range of gateways for common fieldbus interfaces:
| The device communicates via the standard ASi-3 and/or ASi-5. | Standard devices"Single Master": 1 ASi network, 1 ASi-5/ASi-3 Master. 1 ASi network, 1 ASi-3 Master. 2 ASi networks, 2 ASi-5/ASi-3 Masters. 2 ASi networks, 2 ASi-3 Masters. Safety devices "Single Master" : 1 ASi network, 1 ASi-5/ASi-3 Master. 1 ASi network, 1 ASi-3 Master. 2 ASi networks, 2 ASi-5/ASi-3 Masters. 2 ASi networks, 2 ASi-3 Masters. | " yes, max. 4 A/ASi network ": Data decoupling integrated in the gateway. Cost-effective power for 2 ASi networks with 1 power supply (optionally supply of multiple Single Gateways by 1 power supply). Operation with short cable lengths with standard 24 V power supply possible.
Data decoupling integrated in the gateway. Cost-effective power for 2 ASi networks with 1 power supply (optionally supply of multiple Single Gateways by 1 power supply). Operation with short cable lengths with standard 24 V power supply possible.
Data decoupling integrated in the gateway. Optimized for use with 2 x UL certified 30 V/3 A power supplies with power limitation <100 W (BW4223). In combination 2 separate NEC Class 2 compliant ASi circuits are created.
1 ASi power supply per ASi network. Gateway is powered in normal operation from one of the two ASi power supplies. Should one ASi power supply fail, switching to the other ASi power supply allows all the diagnostics functions to be maintained and the unaffected ASi network continues to operate.
1 ASi power supply per ASi network. | Access to ASi master and safety monitor via own software from Bihl+Wiedemann using the diagnostic interface (e.g. USB, RJ45, RS232). For certain devices with Ethernet-based fieldbus (PROFINET, EtherNet/IP), there is also the option of diagnostics and configuration directly via the fieldbus interface.
The latest version of the device description file of the gateway/gateway with integrated safety monitor (GSD, GSDML, EDS, etc.) is available in the "Downloads" section of the respective device. | Safety communication | Safe inputs can be configured as 1-channel or 2-channels depending on the desired application or PL and SIL level.
| Suitable for applications up to category 4/PLe/SIL 3. | Detects whether the same address has been assigned to two ASi nodes. Frequent error when using a handheld addressing device. | Checks the ASi line for interference effects such as noise, external voltages, ... | Using a C-program offers the possibility to run mini-PLC functions with a gateway. | Article No. |
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Gateway with integrated Safety Monitor
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OPC UA, REST API, Sercos
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ASi-3 compatible, ASi-5 compatible
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2 ASi networks, 2 ASi-5/ASi-3 Masters
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yes, max. 4 A/ASi network
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Ethernet diagnostic
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Safe Link, safe Schneider drives over Sercos
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3 x 2 channels
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6 release circuits, 6 x electronic safe outputs
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yes
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yes
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optional
| BWU3861 ASi-5/ASi-3 safe Schneider drives over Sercos Gateway with integrated Safety Monitor, 2 ASi-5/ASi-3 masters |
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Gateway with integrated Safety Monitor
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OPC UA, REST API, Sercos
|
ASi-3 compatible, ASi-5 compatible
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2 ASi networks, 2 ASi-5/ASi-3 Masters
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yes, max. 4 A/ASi network
|
Ethernet diagnostic
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CIP Safety over Sercos, Safe Link
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3 x 2 channels
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6 release circuits, 6 x electronic safe outputs
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yes
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yes
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optional
| BWU3860 ASi-5/ASi-3 CIP Safety™ over Sercos Gateway with integrated Safety Monitor, 2 ASi-5/ASi-3 masters |
 |
Gateway with integrated Safety Monitor
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OPC UA, REST API, Sercos
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ASi-3 compatible, ASi-5 compatible
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2 ASi networks, 2 ASi-5/ASi-3 Masters
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yes, max. 4 A/ASi network
|
Ethernet diagnostic
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CIP Safety over Sercos, Safe Link
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no local safe inputs
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no local safe output
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yes
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yes
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optional
| BWU3845 ASi-5/ASi-3 CIP Safety™ over Sercos Gateway with integrated Safety Monitor, 2 ASi-5/ASi-3 masters |
