Safety Aspects When Generating The Blocks; Standards That Are Complied With; Demarcation Of Din En 528 To The Asrs Block Library - Siemens Simatic Manual

Fail-safe function blocks for storage and retrieval machines
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2.4 Safety aspects when generating the blocks

The blocks for the safety-related control of storage and retrieval machines were generated us-
ing the certified fail-safe function blocks in F-FBD. The development tool compiler generates
fail-safe blocks. These can then be loaded into libraries and called in any F- FBs and F- FCs.
Regarding the internal implementation and the software development process employed, the
fail-safe function blocks for storage and retrieval machines are compliant with PLd/SIL2.
However, it must also be verified that the function blocks from the ASRS block library used in
the user software are in compliance with the relevant standards regarding their behavior and
their principle of operation. Generally, this verification can be realized in the form of a function
test.
Also due to restrictions regarding the hardware components that can be used – specifically in-
verters – the safety level that can be achieved using the fail-safe function blocks for storage
and retrieval machines is restricted to PLd/SIL2.
For the verification of the safety-related parameters required for the hardware components,
please refer to Chapter 1.2.6.
2.5

Standards that are complied with

The ASRS block library was developed in compliance with the following standards:
DIN EN 528 (see Chapter 2.5.1)
DIN EN ISO 13849-1
DIN EN ISO 13849-2
DIN EN 62061
2.5.1

Demarcation of DIN EN 528 to the ASRS block library

Requirements according to EN528:2008 Table C.2
Con-
secutive Safety function
No..
1 Function for monitoring access
through doors
2 Stop function
3 Emergency Stop function
4 Function to stop hoisting motion
at the end stop and for power
failure
S7-Distributed Safety/SIMATIC Safety - fail-safe function blocks for storage and retrieval machines
Covered by the ASRS
Section
5.3.3 No
5.3.4 User interconnection required (e.g.
Distributed Safety/Safety Advanced
5.10.3.3
library)
5.10.3.6
5.3.7 No
User interconnection required (e.g.
Distributed Safety/Safety Advanced
library)
5.3.8 No
5.3.8.1 User interconnection required (e.g.
Distributed Safety/Safety Advanced
5.3.8.3
library)
5.4.1.1 Yes
5.4.2 a), b),
c)
block library
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