Pmc Sr6 In Accordance With Interface Classification (Zvei); Fig. 15 Interface Classification - Interface Type C - Pilz Intern PMC SR6 Manual

More on safety technology and PMC SR6?
In addition to the requirements for the probability of failure, structural requirements must be taken into
account when determining the Performance Level.
The SB1 – SB3 subsystems fulfill the minimum requirements of category 4 systems regarding
controller structures:
} DC
avg
}
CCF: Requirement fulfilled
}
MTTF
11.4

PMC SR6 in accordance with interface classification (ZVEI)

The German Electrical and Electronic Manufacturer's Association (ZVEI) published a policy document
in 2016 (see the chapter Detailed information) that addresses the classification of binary 24 V
interfaces in the field of functional safety.
The policy document defines technical terms, works out the characteristic features of the individual
interface types with dynamic test pulses and describes manufacturer-specific product information and
technical data for the interface types in question.
Based on the classification presented in this policy document, the PMC SR6 safety module can be
used as a data sink (sink) for interface types C and D and activated using information sources
(sources) of the same interface types.
Sinks and sources of interface types C and D are divided into classes according to the time behavior
of the test pulses, where a higher class indicates shorter test pulses. When combining sinks and
sources, it is important to ensure that a selected source at least belongs to the same class as the
selected sink.
Interface type C
+
GND
Fig. 15: Interface classification – Interface type C
TE
TA
GND
R
1
C
1
L
1
Interface type C
proximity switches (with defined behavior under fault conditions in accordance with EN 60947-5-3).
The corresponding devices act as a source for checking the function of their outputs using test
pulses; the corresponding sink, e.g. PMC SR6 safety module, is not allowed to react to these test
pulses by definition.
5
See ZVEI, p. 13ff.
Manual PMC SR6 safety module
1005344-en-US-01
Intern
: High
: High
D
Source
TE
TA
GND
Test Pulse Generation
Test Pulse Assessment
Reference potential
Input resistance
Input capacitance
Input inductance
5
is often used as an OSSD output, such as for safety outputs for light barriers and
+
Sink
R C L
1 1 1
GND GND
DC
Pilz | 40