Siemens SIMATIC S7 FH - Acceptance of F-Block Types; Responsibilities and Qualifications

Safety
Fail-Safe Systems
7-22 A5E00085588-03
7.5.3 Acceptance of F-Block Types
Initial Acceptance
A newly created F-Block type is accepted for the first time in the same way as a
Safety Program. The function test of the F-Block type must take place in a different
Safety Program to the test environment.
At the acceptance of new F-Block types, the signature and initial-value signature of
the new F-Block are relevant. These signatures must be compared with the
acceptance printout. The signatures and initial-value signatures of the called F-
Blocks must also be checked.
The overall signatures in the footers of the printouts of the safety program and the
CFC chart of the F-Block type must match up or the block type will have to be
recompiled.
Acceptance of Changes
Acceptance of changes to an F-Block type is carried out in the same way as for a
Safety Program. All the points in the F test program at which the new F-Block type
is called must also be checked by means of a function test. Changed signatures of
F-Blocks are displayed in the chart view when the Safety Program s are compared.
7.5.4 Responsibilities and Qualifications
Safety requirements relating to the system-specific use of the S7 F/FH Systems
can be met by allocating responsibilities as follows:
• The process experts and the operators for the safety concept of the system,
including the definition of safety-relevant and non-safety-relevant functions.
• The (independent) expert for the safety-related acceptance testing of the
system.
• The planners of the S7 F/FH Systems for the implementation of the safety
concept of the system in function, configuration and wiring charts/diagrams, for
the planning of the interfaces of the F-System, the compliance with and
implementation of regulations from the report on the certificate, and the entry of
passwords in STEP 7.
• The installation and commissioning technicians of the S7 F/FH Systems for the
implementation of and compliance with the requirements placed on the
environment at the installation location, the error-free implementation of the
wiring charts/diagrams, the downloading of the enabled Safety Program to the
CPU, and the assignment of a password to the CPU.
• The commissioning technician of the S7 F/FH Systems for the functional tests
of the acceptance with simulation of the switch-off criteria in accordance with
the safety concept of the system and measurement of the required safety
times.