HB-37420-810-01-25F-EN SMX100 Installation manual.docx Page 83 of 260
Version: 25F
When using a single-channel sensor with clocking, the power supply of the switching element
is attached to the clock exit T1 or T2. The clock must subsequently be assigned to the
SMX100.
The use of a single-channel sensor with clock detects:
short-circuit to supply voltage DC 24 V
short-circuit to DC 0 V
cable interruption (current interruption is safe state!)
However, be cautious in case of a cable short between the two sensor connections, because
this is not detected! A short-circuit between T1 and I01.
Due to the single-channel character of the switching element / sensor its failure requires an
fault exclusion. This is permissible when using positively disconnecting switches with correct
constrained actuation.
A series connection of 2 switching elements with corresponding fault exclusion of a double
fault is on equal footing with the application (Occurrence of two errors at the same time).
These may be e.g. the safety outputs of an electronic monitoring device (light curtain,
switching mat) with internal dual-channel switch-off.
PI d acc. to EN ISO 13849-1 can be achieved by using a suitable switching element and with
cautious wiring of the sensor. In special cases, i.e. in connection with suitable switching
elements and permissible fault exclusions one may also achieve PL e as per EN ISO 13849-1.
Safety note:
• Pl e or higher acc. to EN ISO 13849-1 is achieved if the short-circuit between input and
associated pulse output as well as the short-circuit between the sensor connections
can be excluded. Here one must take care that in a fault scenario the switch must be
positively opening in accordance with EN 60947-5-1. The sensor must additionally be
triggered in regular intervals and the safety function requested. Fault exclusions can be
achieved in accordance with EN ISO 13849-2 table D8. In case of single-channel use
of the inputs, the achievable safety level must be limited to SIL 2 or PL d, if the safety
function is demanded at regular intervals.
• A series connection of 2 switching elements with fault exclusion for double fault
requires testing of the suitability in accordance with the intended safety level of this
element. We would like to draw your attention to the applicable regulations in the EC
machine directive 2006/42/EC.
• For single-channel sensors a safety related use of the inputs is only intended in
connection with the pulse outputs.
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