The prime function of SM811, is to provide intelligent supervision of a controller during non-SIL and SIL1-2 operations, and together with a PM865 form a 1oo2 diverse structure for SIL3 applications.
For high availability applications it is possible to have redundant SM811´s that work together with any of the two redundant CPUs. SM811 has a dedicated synchronization link to synchronize active and redundant SM for hot-insert and online upgrade. It is needed during hot-insert and online upgrade situations to copy data between two SM811s in a redundant setup.
The SM811 has a connector with three digital inputs and two digital outputs that can be used for safety-related digital I/O (not process I/O).
Features and benefits
- MPC862P Microprocessor running at 96 Mhz
- 32 MB RAM
- Provides supervision of the PM865 controller during SIL1-2 operations and together with the PM865 forms a 1oo2 diverse architecture for SIL3 applications
- Over voltage monitoring
- Internal voltage monitoring
- Supports hot swap
- Supports redundancy
- SM Link for synchronization of redundant pair