22
SI-Safety Installation & Operating Manual
Issue Number: 1
3.1.5
Single channel sensor with pulse cross-fault checking
When using a single channel sensor with clocking action, a connection is made to
clocking output P1 or P2. The clocking action on the SI-Safety module needs to be
configured correctly.
When using a single channel sensor with clocking action the following faults are
detected:
•
Short circuit to supply voltage 24 Vdc
•
Short circuit to 0 Vdc
•
Cable interrupt (power disconnection in the ‘safe’ state)
However, caution should be taken because the system will not detect either a cable
short circuit between the two sensor connections, or a short circuit between P1 and
E0.5.
When using an appropriate switch element and with careful wiring of the sensor, PL d
can be achieved in accordance with EN ISO 13849-1:2006.
Figure 3-8 Single channel sensor with clocking action
3.1.6
Two channel sensor with cross-fault checking
Through the use of two independent clocking signals on a non-complementary sensor,
all cross-faults and connections to 24 Vdc and 0 Vdc can be detected. For all safety
applications, only NC contacts are used, without exception.
I/O interface
SMF11
SMF12
E0.5
P1
P2
L+
L-
P1
P2
PL e compliance with EN ISO 13849-1:2006 is achieved if it is possible to exclude the
possibility of a short circuit between E0.5 and P1 and a short circuit between the sensor
connections. Ensure that the switch has forced opening action. 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.
NOTE
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