Siemens SIMATIC S7 FH - Safety-Related Communication between F-Cpus; Public Network Safety F-CPU Communication Not Allowed

Safety Mechanisms
Fail-Safe Systems
3-12 A5E00085588-03
See Also
Interconnecting F-Driver Blocks and Driver Blocks for F-Signal Modules
3.9.4 Safety-Related Communication Between F-CPUs
Communication Options
S7-400FH
S7 FH Systems
S7 F Systems
S7-400FH
S7 FH Systems
S7 F Systems
2
1
3
2
Safety-related communication between CPUs takes place via configured standard or
fault-tolerant S7 connections.
Number Communication
From...
To Connection Type Safety-
Related
1 S7 FH Systems S7 FH Systems S7 connection, fault-tolerant Yes
2 S7 F/FH Systems S7 F Systems S7 connection, fault-tolerant Yes
3 S7 F Systems S7 F Systems S7 connection Yes
The fail-safe blocks F_SENDBO <-> and F_RCVBO or F_SENDR <-> F_RCVR are
available for safety-related communication between safety programs on different F-
CPUs. This means a fixed number of parameters of BOOLs or REALs can be safely
transferred
.
!
Safety Note – Public Network Safety F-CPU Communication Not Allowed
Safety-related communication between F-CPUs is not permissible via public
networks.