SICK nanoScan3 I/O

•
All e
lectrically connected devices use the same earthing method.
•
All earthing points are connected with the same ground potential.
Further topics
•
"E
lectrical installation", page 50
4.4.1 Voltage supply
Prerequisites
•
T
he power supply unit is able to jumper a brief power failure of 20 ms as specified
in IEC 60204-1.
•
The power supply unit provides safe isolation according to IEC 61140 (SELV/PELV
as per IEC 60204-1).
•
The electrical power supply has an appropriate electrical fuse.
Further topics
•
"Data sheet", page 111
4.4.2 USB connection
The device has a USB connection for configuration and diagnostics. The USB connec‐
t
ion complies with the USB 2.0 Micro-B standard (female connector). The USB connec‐
tion may only be used temporarily and only for configuration and diagnostics.
Further topics
•
"Configuration", page 55
•
"Troubleshooting", page 102
4.4.3 OSSDs
Overview
W
hen the protective field is clear, the OSSDs signal the ON state and the signal level is
HIGH (non-isolated). If there are objects in the protective field or there is a device fault,
the OSSDs signal the OFF state with the LOW signal level.
Downstream control elements must evaluate the output signals of the protective device
in such a way that the dangerous state of the machine is safely ended. Depending on
the safety concept, the signal is analyzed by safety relays or a safety controller, for
example.
The OSSDs are short-circuit proof against 24 VDC and 0 V.
Prerequisites
•
T
he machine switches to the safe state if, at any time, at least one OSSD in an
OSSD pair switches to the OFF state.
•
When using a safety controller: The safety controller detects different signal levels
of the two OSSDs of an OSSD pair (depending on national regulations or required
reliability of the safety function). The maximum discrepancy time tolerated by the
control is selected according to the application.
•
The output signals from an OSSD pair are not connected to each other.
•
The machine controller processes both signals of an OSSD pair separately.
PROJECT PLANNING 4
8024596/15VP/2019-11-15 | SICK O P E R A T I N G I N S T R U C T I O N S | nanoScan3 I/O
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Subject to change without notice