Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 30)

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1-18 Document: 553631
(ICSTT-RM447J_EN_P) Issue: 09:
Solutions Handbook (AADvance Controller)
Figure 1: Example HART Pass-through System
SNCP Safety Networks
SNCP (Safety Network Control Protocol) is the Safety Protocol that allows
elements of an AADvance System to exchange data. AADvance SNCP is a SIL 3
certified protocol which provides a safety layer for the Ethernet network making it a
"Black Channel". Data is exchanged by creating a relationship between variables in
different AADvance controllers; this is called "Binding Variables". Once variables are
bound between controllers the SNCP protocol provides a transparent SIL 3 Certified
layer allowing safety related data to be passed between AADvance controllers.
The bindings are based on a producer/consumer model. The controller consuming the
data establishes a binding link with the Controller producing the data, and manages the
entire exchange of data, including scheduling the data exchange, providing the
diagnostics, managing the safety response in the event of faults and managing the
communications redundancy.
SNCP Networks can be configured as Simplex (Fail Safe) or Redundant (Fault tolerant),
the choice of network configuration is dependent on the applications safety and
availability requirements. The data exchange is independent of the physical; network
configuration as the connection between the controllers is treated as a logical
network.