Siemens SIMATIC S7 FH - Interconnecting F Communication Blocks

Programming
Fail-Safe Systems
A5E00085588-03
5-31
5.3.10 Interconnecting F Communication Blocks
You can insert and interconnect the following types of communication blocks in the
Safety Program:
• Blocks for communication between Safety Programs on different CPUs
• Blocks for communication between F-run-time groups
• Blocks for communication between the F user program and the standard user
program
5.3.10.1 Programming Communication Between Safety Programs on
Different CPUs
Available Fail-Safe Blocks
The following fail-safe blocks are available for communication between Safety
Programs on different CPUs:
Block Description
F_SENDBO/F_RCVBO Safe transfer of 20 parameters of the F data type F_BOOL
F_SENDR/F_RCVR: Safe transfer of 20 parameters of the F data type F_REAL
This means a fixed number of up to 20 F parameters of the F-data type F_BOOL or
F_REAL can be safely transferred.
Prerequisites
The following prerequisites must be fulfilled for communication between F-capable
CPUs:
• The two CPUs must be configured as F-CPUs: The "CPU Contains Safety
Program" option must be selected and the password set.
• An S7 connection must be configured between the CPUs.
• Sequence: See Defining the Run Sequence.