4.4.5
Cascading
Overview
Using the optionally available Multi Sensor Connector (MSC), you can connect safe
multibeam scanners and switch them in a cascade.
The Multi Sensor Connector has two interfaces for safe multibeam scanners. You can
also use the second interface for another Multi Sensor Connector and thereby increase
the total number of safe multibeam scanners in the cascade.
You can use a maximum of four safe multibeam scanners in a cascade. The response
time increases in a cascade. The static control inputs act on all devices of a cascade.
For further information, see the separately available mounting instructions for the Multi
Sensor Connector.
Prerequisites
You can switch the safe multibeam scanners in a cascade under the following condi‐
tions
•
The OSSDs must be used in PNP mode for all the safe multibeam scanners.
•
The signal level of the universal output must be set to LOW for all safe multibeam
scanners.
Further topics
•
"Multi Sensor Connector (MSC)", page 82
•
4.4.6
Overview
Depending on the regulations which apply at the place of installation, a restart interlock
may be required.
The restart interlock prevents the machine from automatically starting up, for example
after a protective device has responded while the machine is operating or after chang‐
ing the machine’s operating mode.
The protective device does not have an internal restart interlock. You must therefore
implement a restart interlock externally via the circuitry or the control if needed, e.g. in
connection with the SICK RLY3-OSSD2 / RLY3-OSSD3 safety relay.
Restart delay
The safe multibeam scanner has an integrated restart delay that you can use to delay
the restart of the OSSDs.
The restart delay does not comply with the applicable requirements for using a restart
interlock because the OSSDs start automatically after the configured delay has elapsed
and no manual interaction is required.
4.4.7
External device monitoring (EDM)
The external switching elements (external device monitoring, EDM) must be inspected
in line with the regulations which apply at the place of installation or the required
reliability of the safety function.
External device monitoring (EDM) monitors the status of downstream contactors.
The protective device does not have an internal EDM. You must therefore implement
the EDM externally via the controller.
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PROJECT PLANNING
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