Blocks For Converting Data; Use F_Lim_R For Plausibility Check Of Standards To F-Data Conversion - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
8.4

Blocks for Converting Data

Block
F_BO_FBO
F_I_FI
F_R_FR
F_TI_FTI
F_FBO_BO
F_FI_I
F_FR_R
F_FR_FI
F_FTI_TI
F_QUITES
Safety Note – Use F_LIM_R for plausibility check of standards to F-data
!
conversion
The F_BO_FBO, F_I_FI, F_TI_FTI and F_R_FR blocks only carry out data
conversion. This means you must program additional measures for plausibility
checks in the Safety Program, for example using F_LIM_R, to ensure that only
safe operation is possible.
Plausibility Checking
The simplest form of plausibility check is to specify a range with fixed upper and
lower limits, e.g. with the F_LIM_R block. Not all the input parameters can be
checked for plausibility simply enough. These input parameters cannot be
modified during operation.
Fail-Safe Systems
A5E00085588-03
Description
Convert from BOOL to F_BOOL
Convert from INT to F_INT
Convert from REAL to F_REAL
Convert from TIME to F_TIME
Convert from F_BOOL to BOOL
Convert from F_INT to INT
Convert from F_REAL to REAL
Convert from F_REAL to F_INT
Convert from F_TIME to TIME
Fail-safe acknowledgment via the ES/OS
8-35