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Configuration of the safety-monitoring module
F
If the safety sensor is connected to electronic safety-monitoring modules, we recommend that you set a discrepancy time of
min. 100 ms. The safety inputs of the safety-monitoring module must be able blanking a test impulse of approx. 1 ms. The
safety-monitoring module does not need to have a cross-wire short monitoring function, if necessary, the cross-wire short
monitoring function must be disabled.
5.2 Serial diagnostic -SD
Cable design
The wiring capacitance of the connecting cable of the safety sensor must not exceed 50 nF.
Depending on the strand structure, normal unshielded 200 m long control cables LIYY 0.25 mm² to 1.5 mm² have a
wiring capacitance of approx. 20 ... 50 nF
On wiring SD devices, please pay attention to the voltage drop on the cables and the current carrying capacity of the individual
F
components.
Accessories for the series-wiring
F
For convenient wiring and series-wiring of SD components, the SD junction boxes PFB-SD-4M12-SD (variant for the field) and
PDM-SD-4CC-SD (variant for control cabinet on carrier rail) are available along with additional comprehensive accessories.
Detailed information is available on the Internet, products.schmersal.com.
5.3 Wiring examples for series-wiring
Series-wiring can be set up. In the case of a series connection, the risk time remains unchanged and the reaction time
increases by the sum of the reaction time of the inputs per additional unit specified in the technical data. The number
of components is only limited by the external cable protection according to the technical data and the line loss. Series-
wiring of up to 31 RSS 36 ... SD components with serial diagnostics is possible.
The application examples shown are suggestions. They however do not release the user from carefully checking
whether the switchgear and its set-up are suitable for the individual application. The application examples shown are
suggestions.
Wiring example 1: Series-wiring of the RSS 36 with conventional diagnostic output
The voltage is supplied to both safety inputs of the last safety sensor of the chain (considered from the safety-
monitoring module).
The safety outputs of the first safety sensor are wired to the safety-monitoring module. The diagnostic output can be
connected for instance to a PLC.
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