4.1.2 Conceptual overview
A ctrlX DRIVE system consists of the components power section, control
section (including the firmware), motor and the possibly required additional
components.
The integrated safety technology is implemented based on the interaction of
the hardware and firmware components.
Fig. 4-1: Schematic diagram of ctrlX DRIVE with integrated safety technology
"STO (Safe Torque Off)"
The safety function "Safe Torque Off" does not require any
measuring system.
4.1.3 Risk assessment
Before a machine can be placed on the market, the manufacturer of the
machine must carry out a risk assessment in accordance with the Machinery
Directive 2006/42/EC in order to determine the hazards associated with the
use of the machine.
The risk assessment is a multilevel, iterative process. The procedure is
described in detail in "EN ISO 12100" ‑ "General principles for design - Risk
assessment and risk reduction". This documentation can only give a very
short overview on the subject of risk assessment. Users of integrated safety
technology are obliged to intensively study the respective standards and legal
status.
The risk assessment carried out provides the requirements for determining
the category for safety-related control units according to the valid C-standard
the safety-relevant parts of the machine control have to comply with.
For more detailed information on the required Safety Integrity
Levels (SIL) and Performance Levels (PL), please refer to the
applied component- and machine-relevant standards in "Safety-
relevant standards and regulations".
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System overview
ctrlX SAFETY "Safe Torque Off" Safety Option in ctrlX DRIVE
Bosch Rexroth AG R911383774_Edition 03
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