Fail-Safe Systems
A5E00085588-03
8-1
8 Fail-Safe Blocks
8.1 Overview
8.1.1 Fail-Safe Blocks
All the fail-safe blocks are contained in the Failsafe Blocks library in the catalog of
libraries
.
If possible, the F-Blocks are assigned to the existing families of standard blocks in
the catalog of the blocks used
. Since the names of the F-Blocks always
begin with "F_", they appear together as a group.
Fail-safe blocks are available in the following block families:
DRIVER Driver Blocks for F-I/Os
COM_FUNC Blocks for F Communication Between CPUs
F_SYSTEM F system blocks
CONVERT Blocks for converting data between standard and
safety sections
F_CTRL F Control Blocks
BIT_LGC Logic blocks with the BOOL data type
COMPARE Comparison blocks for two input values of the same
type
FLIPFLOP Flipflop blocks
IEC_TC IEC pulse and counter blocks
IMPULS Pulse blocks
MATH_INT Arithmetic blocks with the INT data type
MATH_FP Arithmetic blocks with the REAL data type
MULTIPLX Multiplex blocks
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