SI-Safety Installation & Operating Manual
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Issue Number: 1
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Figure 3-9 Two channel non-complementary sensor with clocking action
3.1.7
Two channel complementary sensor,
When connecting a complementary sensor, always ensure that only the NC contact is
tested continuously by the clocking action. All types of fault are detected in the feed/
input.
When using approved switch elements with forced opening action, it is possible in both
cases to achieve PL e compliance in accordance with EN ISO 13849-1:2006.
•
PL e compliance with EN ISO 13849-1:2006 can be achieved where it is possible to
exclude the possibility of a short circuit between input and associated pulse output,
and of a short circuit between the sensor connections.
•
Under such conditions, ensure that the switch has forced opening action in the
event of a fault. In addition, the sensor needs to be activated at regular intervals,
and the safety function checked for correct operation.
•
Fault exclusions can be achieved in accordance with EN ISO 13849-2, Table D8.
With single channel use of these inputs, the achievable safety level is restricted to
SIL 2 and/or PL d, if a safety function is requested at regular intervals.
•
In all cases, these safety related inputs should only be used in a technical safety
context in conjunction with pulse outputs.
I/O interface
SMF11
SMF12
E0.5
P1
P2
L+
L-
P1
P2
Safety instructions
WARNING
Summary of Contents for unidrive m
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