CC-Link Safety is a network with high reliability in data transmission suitable for use in safety applications that require compliance with IEC61508 SIL3 and EN954-1/ISO13849-1 Category 4. CC-Link Safety is compatible with standard CC-Link. It allows the use of existing investments in network cable, other compatible products, and existing engineering effort. Safety devices and non-safety devices can reside on the same network. CC-Link Safety will detect communication failures such as unexpected delay of communication or erroneous data 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. Safety master station maintains error and failure histories of the safety remote stations.
IEC61508 SIL3 requires less than 10-7of 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 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 a safety data error.
The Integrated CC-Link System
CC-Link Safety is compatible with standard CC-Link and this allows the use of existing investment in network cable, other 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 system consists of:
- a CC-Link Safety master station
- one or more CC-Link Safety slave stations
- optionally, one or more standard CC-Link slave stations (remote I/O stations or remote device stations)
Other features include:
- Safety communication speeds of 10Mbps.
- The same high-speed 10Mbps. communication speed CC-Link, enabling a safety system that provides high performance.
- Our safety communication design can detect every communication error or malfunction such as an unexpected delay of communication or erroneous data and then bring the system to fail safe shutdown.
- Existing CC-Link certified cables can be use for CC-Link Safety. In addition, original CCLink compatible devices can reside on the same network that incorporates CC-Link Safety devices.
- Maintain error and failure information on the network centrally. Safety master station maintains error and failure histories of the safety remote stations, which enhances in troubleshooting.
CC-Link-Safety Specification
| CC-Link Safety – V1.12 | ||
|---|---|---|
| Safety stations | Standard remote I/O or remote device stations |
|
| Number of Stations | 42 Safety Stations (max)* | 64 Slave Stations (max)* |
| Communication Speed | 156k, 625k, 2.5M, 5M, 10M bps | |
| Error control | CRC, RAS, CRC32 | CRC, RAS |
| Maximum Input Points | 2,048 bits | 2,048 bits |
| Maximum Output Points | 2,048 bits | 2,048 bits |
| Maximum Input Words | 128 words (16-bit) | 128 words (16-bit) |
| Maximum Output Words | 128 words (16-bit) | 128 words (16-bit) |
| Device Capacity | 1 or 2 occupied stations | 1,2,3 or 4 occupied stations1 or 2 occupied stations |
| One (1) Occupied Station Maximum amount of link data |
32 Bits In 32 Bits Out No Words Available |
32 Bits In 32 Bits Out 4 Words In 4 Words Out |
| Two (2) Occupied Stations Maximum amount of link data |
32 Bits In 32 Bits Out 4 Words In 4 Words Out |
64 Bits In 64 Bits Out 8 Words In 8 Words Out |