Siemens SIMATIC S7 F Manual page 118

Programming
5.3.10.3 Programming Communication Between the F User Program and
the Standard User Program
Available F Conversion Blocks
The following F conversion blocks are available:
Block
F_BO_FBO
F_I_FI
F_R_FR
F_TI_FTI
F_FBO_BO
F_FR_R
F_FI_I
F_FTI_TI
Rules for F Conversion Blocks
If data is to be exchanged between the F and the standard user programs, you
must not interconnect the inputs and outputs directly. Instead, you must use
separate F conversion blocks from the F library for these functions that can convert
to and from the safety data type.
Please comply with the following rules when you insert and interconnect F
conversion blocks:
•
The F-Blocks used to convert F-data types into standard data types
(F_FBO_BO, F_FR_R, F_FI_I or F_FTI_TI) must be placed in the standard
program.
•
The blocks used to convert standard data types to F-data types (F_BO_FBO,
F_I_FI, F_R_FR, F_TI_FTI) must be placed in the Safety Program.
•
You can only operate the Safety Program by means of F conversion blocks,
which you must insert explicitly.
5-36
Description
Converts from standard BOOL to F_BOOL
Converts from standard INT to F_INT
Converts from standard REAL to F_REAL
Converts from standard TIME to F_TIME
Converts from F_BOOL to standard BOOL
Converts from F_REAL to standard REAL
Converts from F_INT to standard INT
Converts from F_TIME to standard TIME
Fail-Safe Systems
A5E00085588-03