GE RSTi-EP, Руководство по функциональной безопасности

Страница: 12 / 76

Chapter3 . Safety
8 RSTi-EP Functional Safety Manual GFK-2956A
Category B: The safety-related components of machine controls and/or their safety equipment as
well as their components must be designed, selected, assembled and combined to the state of the
art such they can withstand the expected conditions.
Category 1: The requirements of Category B must be met. Use of proven safety-related components.
Category 2: The requirements of Category B must be met with the use of proven safety principles.
The safety functions must be verified by the machine controls at suitable intervals (depending on the
application and the type of machine).
Category 3: The requirements of Category B must be met with the use of proven safety principles.
Controls must be designed so that a single failure in the control system does not lead to a loss of
safety function(s), and whenever reasonably practicable, the single failure shall be detected with
suitable means which meet the state of the art.
Category 4: The requirements of Category B must be met along with the use of proven safety
principles. Controls must be designed so that a single failure in the control system does not lead to a
loss of safety function(s), and whenever reasonably practicable, a single failure is detected during or
prior to the next demand upon the safety function, or if this is not possible, an accumulation of faults
does not lead to the loss of the safety function(s).
2.5 Legal Notice
The RSTi-EP series products are CE-compliant in accordance with Directive 2004/108/EC (EMC
Directive) and Directive 2006/95/EC (Low Voltage Directive). They also meet the requirements of the
ATEX Directive 94/9/EC.
2.6
Requirements on Sensors/Signal Generators
The sensors/signal generators being connected must meet the following requirements:
•
Only signal generators that are suited for the respective required safety level may be used.
•
Positively opening control switches must be used in accordance with IEC 60947-5-1
(designated with this symbol: ).
•
Only use components that have been proven in operation.
•
Depending on the established risk level, switches (for example, for position monitoring) may
have to have a redundant design.
•
Depending on the required safety level, control devices may have to have a redundant
design. In this regard, make sure to take into account the applicable C standards.