SERCOS
Safety -- CIP Safety on SERCOS
CIP Safety on SERCOS is based on the ODVA CIP Safety™ safety protocol and provides for safe data transmission over SERCOS III up to SIL 3 (Safety Integrity Level) according to IEC 61508. The safety protocol uses the SERCOS Messaging Protocol (SMP), which enables the representation of the CIP data and services on configured, cyclic data containers in the SERCOS telegram. Due to the routing capability of the CIP Safety protocol, a safety network can stretch across several diverse communication networks (e.g., DeviceNet, Ethernet/IP, SERCOS III). According to the CIP Safety specification, the safe data container embedded in the SERCOS frame can contain between 2 and 250 Bytes of safe user data. Independent of the type of data -- command values, logical signals, or safe logic or process information -– SERCOS III provides a homogeneous, continuous solution for modern automation concepts.
Safe data can be exchanged between slaves directly using the peer-to-peer cross-communication capabilities of SERCOS III, without collection and re-distribution of data by a central master (safety control) -- and this with minimal reaction times.
In addition, when combining SERCOS safety with the fault tolerance provided by the hardware redundancy of SERCOS III, safe, highly dependable automation solutions can be implemented for both centralized and decentralized safety applications.
At Hannover Fair 2008, SERCOS International announced that the evaluation by TÜV Rheinland and BGIA St. Augustin of the CIP Safety on SERCOS specification has been completed and it is being released as a function-specific profile (FSP Safety) for Industrial Ethernet-based SERCOS III. The extensions specified by SERCOS International will be included in Edition 2.2. of the CIP Safety specification and will be published in the IEC 61784-3 international safety standard. Thus, users of the SERCOS III real-time Ethernet technology can rely on an established network-spanning safety protocol, CIP Safety of the ODVA (Open DeviceNet Vendors Association).
In November 2006, SERCOS International (SI) and ODVA announced their intention to develop the CIP Safety on SERCOS concept. Now that the specification has been approved, SI and ODVA jointly will develop and establish conformance testing for devices implementing CIP Safety on SERCOS to help ensure compliance with the collective body of specifications and enable interoperability of these devices in multi-vendor systems.
About CIP Safety
CIP Safety is a network protocol for functional safety. It has been certified by TÜV Rheinland to comply with the IEC standard 61508 for functional safety entitled "Functional safety of
electrical/electronic/programmable electronic safety-related systems," for use in applications up to Safety Integrity Level 3 (SIL3). The CIP Safety protocol is media-independent and its functionality resides in the end nodes, allowing both standard and safety devices to operate on the same network. It provides the user with flexibility in design of safety network architecture to utilize safety programmable controllers or peer-to-peer communication between sensors and actuators. It also allows safety devices on one subnet to communicate seamlessly to safety devices on another subnet using a standard CIP Network as a backbone.
DeviceNet, CIP and CIP Safety are trademarks of Open DeviceNet Vendor Association, Inc. (ODVA).
EtherNet/IP is a trademark of ControlNet International under license by ODVA.
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