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Safety concept
4 Safety
Instruction book, IQAN-MC3
The IQAN-MC3 module connected to output subsystem.
The IQAN-MC3 is suitable for connection to output subsystems of category B, 1, 2, 3
or 4 in accordance with EN ISO13849-1, up to PLd.
Local physical inputs used as part of input subsystem in safety
functions
This section describes the concept for how to use the IQAN-MC3 inputs (e.g. VIN,
DIN, FIN, DFIN) as part of an input subsystem in a safety function.
Pairs of inputs
All inputs used in the safety function, where a fault can lead to a dangerous failure,
should be connected in pair with a separate signal.
For VIN, the unit can accept a single analog signal without degradation of the safety
integrity, but DIN, FIN and DFIN must always be used in conjunction with a separate
monitoring signal. For details, see section I/O functionality, on page 28.
WARNING
Although the IQAN-MC3 can accept a single VIN as input to a safety function without
degradation of its own integrity (IQAN-MC3), the use will normally be restricted due
to lack of diagnostics and redundancy on the source of the signal (e.g. sensor).
Pairs of signals may be used either:
• as a fully redundant structure
Fully redundant structure.
• or, as a single channel that performs the safety function combined with a monitoring
channel.
Single structure with monitoring by separate signal.
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