CC-Link Safety is a network with high reliability in data transmission suitable for use in safety applications that require compliance with IEC 61508 SIL3 and ISO13849-1 Category 4.

Recently the desire for safety networks has been increasing in order to reduce the amount of wiring in safety systems.  The compatibility of safety devices such as light curtains and safety switches having safety networking ability reduces the amount of wiring, cost and installation labor.

IEC61508 SIL3 requires less than 10^-7 of undetected communication failure rate. CC-Link Safety meets that requirement and will detect communication failures that may cause malfunction of the emergency stop operation.  This fail-safe function will bring machinery into a safe condition quickly if a communication failure is detected.  This is accomplished by adding a safety function layer on the upper level layer of the CC-Link protocol that detects each transmission error.  Information for the safety function layer includes a “running number” to specify message order and CRC32 to detect an unreadable message bit.

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The Integrated Open-Technology CC-Link Network System
CC-Link Safety is compatible with standard CC-Link.  It allows the use of existing investments in network cable, CC-Link compatible products, and existing engineering effort.  Safety devices and non-safety devices can reside on the same network.  It also provides the same high-speed communication and high-speed response for safety communication as standard CC-Link communication.

• A CC-Link Safety Master station
• one or more CC-Link Safety slave stations
• Optionally one or more CC-Link Remote I/O or Remote Device slave stations

The CC-Link Partner Association (CLPA) is working with safety equipment manufacturers to develop a wide range of CC-Link Safety compatible products.

Configuration of a typical CC-Link Safety system

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