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How to communicate quickly and safely using CIP Safety on Sercos
CIP Safety on Sercos

CIP Safety on Sercos is a protocol for transmitting safety-relevant data via Sercos – defined in cooperation with the ODVA and certified according to IEC 61508 up to SIL3. There is no need for additional cabling for a safety bus because signals are simply transmitted together with other real-time data on the Sercos network. The integration of drive, periphery and safety bus as well as standard Ethernet in one single network simplifies handling and reduces hardware and installation costs. Integrated safety control systems and homogeneous safety solutions can be carried out with ease.

With CIP Safety on Sercos, data is safely transmitted to the same medium using the same connection as the rest of the communication. The functionality of the transport protocol and non-medium dependent CIP safety protocols lies in the end devices, which allows standard and safety devices to be operated simultaneously on the same network. Safe communication is possible across and between all network levels. The master, therefore, does not necessarily have to be a safety controller, but can also route data without having to interpret it. Safe Sercos slave devices can be connected to each other without safety controllers and can communicate securely via direct cross communication with the shortest reaction times. This gives the user real flexibility when setting up safety network architecture, when installing safety programmable controllers or when directly transmitting safety data between sensors and actuators.

Moreover, by using a standard CIP network, communication is made seamlessly from safety devices in one subnet to/from safety devices in another subnet.

Safety-relevant data is transmitted as a safety data container. The data container is stored in the relevant real-time device channel just like standard data – in an MDT just as in an AT. A multiplex protocol, SMP (Sercos Messaging Protocol), is used to transmit safety data that has been scanned differently without losing bandwidth despite there being shorter bus cycles. CIP Safety is a network protocol for functional safety. It has been certified by TUV Rheinland for installation in applications with a safety integrity level of 3 (SIL3) and satisfies the IEC standard 61508 for functional safety (“functional safety of safety-related electric/electronic/programmable electronic systems”).

Sercos safety data container for transmitting all safety-relevant data
Sercos safety data container


A single safety protocol for Sercos, EtherNet/IP and DeviceNet enables our machines and systems to be universally connected and allows safety related process data to be transmitted.”