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 forma 1oo2 diverse structure for SIL3 applications.
For high availability applications itis possible to have redundant SM811´s thatwork together with any of the two redundant CPUs. SM811 has a dedicated synchronization link to synchronize active and redundant SMfor hot-insert and online upgrade. Itis 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 thatcan 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
Overvoltage monitoring
Internalvoltage monitoring
Supports hot swap
Supports redundancy
SMLink for synchronization of redundant pair