Pilz PSS SB FT, Basic license - Manual (Page 12)

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Introduction
Modular Block System: Burner Management
MBS Modular Block System
Safety-related areas can be equipped with a multitude of safety devices
such as E-STOPs, safety gates, light barriers etc. Safety devices are
required in various quantities and combinations, depending on the object
requiring protection. The Pilz MBS Modular Block System was developed
to drive the various safety devices and to carry out process engineering
functions, The MBS is designed to help users save time and money.
The MBS consists of individual standard function blocks (SBs), which are
geared specifically towards the relevant safety device or process
engineering function. It allows standard function blocks to be used in any
combination. The standard function blocks can be combined in any
sequence (max. 600).
Standard function blocks are encoded by an authorised body so that they
cannot be modified. If encoded standard function blocks are used within a
user program, program testing may be restricted to the new parts of the
program, considerably reducing the test time.