Siemens SIMATIC PCS 7 Operating Manual page 90

Configuring the safety program
7.2 Creating the safety program
Programming data exchange between F-shutdown groups
If you wish to exchange data between two F-shutdown groups, you are not permitted to
interconnect the inputs and outputs directly. You need to use the following F-system blocks
for data exchange between F blocks in different F-shutdown groups:
F block
F_S_R/F_R_R
F_S_BO/F_R_BO
Procedure for data exchange
1. In the F-shutdown group from which data is to be transferred, add an F_S_R or F_S_BO
type F-block.
2. In the F-shutdown group to which data is to be transferred, add an F_R_R or F_R_BO
type F-block.
3. Interconnect the SD_R_xx inputs of the F_S_R or the SD_BO_xx inputs of the F_S_BO
with the data to be transferred.
4. Interconnect the RD_R_xx outputs of the F_R_R or the RD_BO_xx outputs of the F_R_BO
with the inputs of the F-block for further processing of the data received.
5. Interconnect the S_DB output of the send block with the S_DB input of the associated
receive block.
6. Configure the TIMEOUT inputs of the F_R_R and F_R_BO receive blocks with the F-
monitoring time calculated.
7. Configure the receive block substitute values for the scenario of a shutdown of the
sending shutdown group.
90
Description
Safe transfer of 5 data of the F_REAL type
Safe transfer of 5 data of the F_BOOL type
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB