Additionally Required Blocks - Siemens Simatic Manual

Block interaction
4.4.4

Additionally required blocks

The following blocks, belonging to the Distributed Safety library, are called in the fail-safe func-
tion blocks, and must therefore be located in the block folder:
See Chapter 3.1.2
Further, for diagnostics, we recommend that the following organizational blocks are inserted in
the block folder, if they are available on the CPU being used:

Diagnostics alarm – OB 82

Withdrawing/inserting in operation – OB 83

Program run error – OB 85

Module rack failure – OB 86

Communication error – OB 87

Programming error – OB 121

Periphery (I/O) access error – OB 122
S7-Distributed Safety/SIMATIC Safety - fail-safe function blocks for storage and retrieval machines
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