Standards and approvals
A.3 Safety of electronic controllers
SIMOTION D4x5-2
140 Manual, 02/2012
A.3 Safety of electronic controllers
Introduction
The following remarks relate to fundamental criteria and apply irrespective of the type of
controller and the manufacturer.
Risk
A higher degree of safety standard applies to all applications and situations where there is a
risk of material damage or injury to persons if there is a failure. Special regulations specific to
the system apply to such applications. These must be taken into account for configuration of
the controller (e.g. VDE 0116 for furnaces).
For electronic controllers with safety responsibility, the measures required for preventing or
controlling faults depend on the hazard inherent in the plant. In this respect, the basic
measures listed above are no longer adequate once the hazard exceeds a certain potential.
Additional measures (e.g. double redundancy, tests, checksums, etc.) for the controller must
implemented and certified (DIN VDE 0801).
The residual risk
When assessing his machine's risk in accordance with the EC Machinery Directive, the
machine manufacturer must take into account the following residual risks emanating from the
control and drive components:
1. Unintentional movements of driven machine components during commissioning,
operation, maintenance, and repairs caused by, for example:
– Hardware defects and/or software errors in the sensors, controllers, actuators, and
connection technology
– Response times of the controller and drive
– Operating and/or ambient conditions not within the scope of the specification
– Parameterization, programming, cabling, and installation errors
– Use of radio devices / cellular phones in the immediate vicinity of the controller
– External influences / damage
2. Exceptional temperatures as well as emissions of light, noise, particles, or gas caused by,
for example:
– Component malfunctions
– Software errors
– Operating and/or ambient conditions not within the scope of the specification
– External influences / damage
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