Advantages of Sercos III
- All automation devices, i.e., controllers, servo drives, pneumatic and hydraulic controls/drives, I/O, vision systems, encoders and distributed peripheral devices, communicate via a uniform Ethernet-based network.
- Safe and non-safe participants can coexist in one network without influencing the security technology.
- EtherNet/IP and other Ethernet-based protocols can be transmitted at the same time as real-time data without influencing the real-time characteristics.
Fast and Direct
- High speed: Sercos III uses 100 Mbit/sec Full-Duplex Fast Ethernet.
- Short runtimes: runtimes through the network are reduced to a minimum. This is achieved by:
- Extremely fast processing of the Sercos III real-time messages when passing through the devices ("on-the-fly").
- No additional network components, e.g., hubs or switches.
- Direct cross communication: all nodes can exchange data directly within one communication cycle.
- Efficient usage of bandwidth: ideal utilization of bandwidth possible via multiplexing techniques.
- Configurable cycle time: the communication cycle can be varied between 31.25 μs and 65 ms.
- Synchronicity and simultaneity down to a fraction of a microsecond.
- All office communication protocols (e.g., TCP/IP, UDP/IP) can be transmitted parallel to Sercos III real-time communication via the same cable. Synchronization and redundancy are not mutually exclusive.
- Standard Ethernet protocols use MAC or IP addresses to communicate with individual Sercos III devices. Tunneling of these protocols is not necessary.
- Commissioning and diagnosis of Sercos III devices using standardized interfaces (SCI, S/IP, and FDT/DTM).
- Safety functions up to SIL3 according to IEC 61508 can be implemented with CIP Safety on Sercos.
- The routing capability of CIP Safety supports safe device communication across network boundaries.
- A safety network can stretch across diverse CIP Safety networks, for example, Ethernet/IP, DeviceNet and Sercos III.
- For high-availability automation solutions, Sercos III automatically offers fail-safe communication in the case of a cable break or node failure through the use of a ring topology (ring redundancy).
- The time needed to detect and respond to a cable break is a maximum of 25 μs, so at most only the data from one cycle is lost and communication is continued thereafter.
- If a redundancy situation occurs, the synchronization quality is maintained.
- Centralized and decentralized control architectures are supported.
- User-defined device configuration within the network.
- Support of ring or line topologies. In addition, hierarchical, synchronized and real-time coupled network structures can be implemented.
- Hot-plugging is supported without interference with real-time or synchronization functions.
Easy to Implement
- Sercos III devices can be easily configured and commissioned via a uniform, integrated device model and universal, standardized device profiles.
- The protocol automatically detects the device and where it is connected in the topology. This makes it easy to localize the affected device for servicing.
- Easy wiring, as the physical order of the devices is not relevant and the order of connection of the two Sercos III ports is not important.
- Software tools include free Sercos II master library, IP protocol library and Sercos monitor.
- Conformance test software and a Sercos multislave emulator are also available.
- Use of standard components allows for cost-effective implementation of hardware. Additional active network devices, e.g., switches or hubs, are not required.
- Master connectivity can be implemented in hardware, hardware and software, or just software.
- Slave connectivity is based on cost efficient and flexible FPGA devices or integrated multi-protocol chips.
- Sercos has been an international standard for real-time communication since 1995 (IEC 61491).
- The Sercos III real-time Ethernet protocol is part of IEC 61158 and IEC 61784. The device profile for drive communication is included in IEC 61800-7.
- Experts from the Sercos working groups contribute to national and international standardization committees.
- Twice-yearly free plug-fests give manufacturers the ability to easily test their devices for interoperability with devices from other manufacturers.
- Sercos is a non-proprietary technology.
- The specifications are completely disclosed.
- Membership in a user organization is not required in order to use the Sercos technology.
- Sercos is an open, international standard.
- The specifications are maintained and developed by experts in non-proprietary working groups.
- Good investment protection is provided by backwards compatibility.
- The technology is continuously developed and adapted to new market requirements.
- Products from leading automation manufacturers support Sercos.
- Sercos is widely accepted in many different industries, particularly in demanding applications.
- Over 3 million Sercos real-time nodes are used worldwide in more than 350,000 applications (and growing).
Worldwide User Groups
- Active user groups in Europe, North America and Asia support Sercos.