More On Safety Technology And Pmc Sr6; Srp/Cs: Processing A Typical Safety Function; Fig. 6 Srp/Cs Components For Processing A Typical Safety Function - Pilz Intern PMC SR6 Manual

More on safety technology and PMC SR6?

11 More on safety technology and PMC SR6?
The following chapters outline the important terms, relationships and measures regarding the
PMC SR6 safety module and safety technology.
11.1

SRP/CS: Processing a typical safety function

If a machine or system poses hazards that cannot be eliminated through design measures, suitable
protective devices and safety functions must be defined and implemented in order to reduce the risk
potential.
The safety functions and associated requirements necessary for the Safety Integrity Level and
Performance Level (SIL, PL) depend on the respective application and possible dangers. For
electrical power drive systems with adjustable speed, the safety functions are defined in
DIN EN 61800-5-2.
Implementation of safety functions is generally handled by safety-related parts of control systems
(SRP/CS).
A typical safety function is a combination of the safety-related parts of a controller (SRP/CS) and the
following components:
}
Input (SRP/CS
} Logic (SRP/CS
}
Output (SRP/CS
}
Connections, e.g. electrical or optical
Trigger
event
Fig. 6: SRP/CS components for processing a typical safety function
Input
Logic
Output
Trigger event
Drive
Explanation
A sensor acts as an input component to detect a situation that triggers the safety function. The logic
component processes the measured signals and then the actuator acts as an output component to
safely trigger the dangerous motion.
The drive controller in combination with the integrated PMC SR6 safety module is part of the SRP/CS
actuator.
Whether a safety controller or a safety relay is used as a logic component of a SRP/CS depends on
its complexity as well as on the required SIL and PL.
Manual PMC SR6 safety module
1005344-en-US-01
Intern
)
a
)
b
)
c
Input
SRP/CS
a
Sensor, e.g. limit switch
Safety controller or safety relay
Actuator, e.g. drive controller including safety module
Opening a separating protective device or pressing a button by hand
Motor or cylinder
Logic Output
SRP/CS SRP/CS
b
Drive
c
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