20
SI-Safety Installation & Operating Manual
Issue Number: 1
•
For a technical safety assessment of the sensor sub system, manufacturer's data
(MTTFd, FIT figures etc.) need to be incorporated.
•
The DC figures quoted in Table 3-2 need to be applied in a conservative manner,
and compliance with the parameters in the Comments section need to be observed.
•
Fault exclusions are permitted in accordance with the applicable standards.
Compliance with the parameters listed here must be assured at all times.
•
If several sensor systems are required to assure proper function of an individual
safety function, always merge their partial values correctly in accordance with the
selected procedure.
Table 3-3 Classification of digital inputs
3.1.2
Single channel sensor without cross-fault checking
The single channel sensor is connected to the SI-Safety module without clocking action
(pulsing cycles), and/or without cross-fault checking This design is not advisable for
safety-related applications. A maximum PL b in accordance with EN ISO 13849-1:2006
can be achieved.
Figure 3-5 Single channel sensor without cross-fault checking
Safety instructions
WARNING
Digital inputs
Performance level
Comment
SMF11/SMF12
to
SMF41/SMF42
PL e
Requires two channel inputs with
cross fault checking using clock
outputs (see Figure 3-9 and
Figure 3-10 for examples)
E0.5
PL d
Restriction in disengagement
Fault detection ‘on demand’. If a
single channel input is used, then
cross-fault checking is required
using a clock output (see Figure
3-8 for example)
I/O interface
SMF11
SMF12
E0.5
P1
P2
L+
L-
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