Introduction; Fail-Safe Function Block F_Endzone - Siemens Simatic Manual

Fail-safe function blocks for storage and retrieval machines

3.6 Fail-safe function block F_ENDZONE

3.6.1

Introduction

The fail-safe function block F_ENDZONE is used to safely monitor the end stops of a travel range. If
the monitored system approaches the parameterizable positive or negative end stop, then depending
on the actual position along a parameterizable curve, its maximum permissible velocity is limited down
to standstill.
The curve is parameterized as table using 10000 individual points in a fail-safe data block assigned to
the block.
With the fixed assignment of the fail-safe data block, the block is available in six versions. These only
differ regarding the assignment to the fail-safe data block. This means that it is possible to appropri-
ately select the block if the permanently assigned fail-safe data block is already occupied by its own
user program or more instances of the block are used. The six versions have an identical function.
FB number FB name
FB210 F_ENDZONE_DB16000
FB211 F_ENDZONE_DB15999
FB212 F_ENDZONE_DB15998
FB213 F_ENDZONE_DB511
FB214 F_ENDZONE_DB510
FB215 F_ENDZONE_DB509
If the axis travels beyond the end stop, or the maximum permitted velocity is exceeded, then the block
is signaled and, depending on the user interconnection, a stop response initiated.
The block has a retraction logic function so that when an end stop is passed, the axis can be returned
to the permitted travel range. The axis can move away from the end stop with a safely-limited low ve-
locity parameterized at the block. The block provides two signals to control the SDI function in the
drive to inhibit continued travel towards the end stop.
Note
When using
F_INT_RD/RD_FDB (FC 179) must be available in the block folder. It is not per-
missible that these are renumbered!
S7-Distributed Safety/SIMATIC Safety - fail-safe function blocks for storage and retrieval machines
DB number
DB16000
DB15999
DB15998
DB511
DB510
DB509
this block, blocks
DB name
F_ENDZONE_DB16000_DB
F_ENDZONE_DB15999_DB
F_ENDZONE_DB15998_DB
F_ENDZONE_DB511_DB
F_ENDZONE_DB510_DB
F_ENDZONE_DB509_DB
F_BO_W/BO_W (FC 176) and
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