Pilz PSEN opII4H Series, Operating Manual, Page: 14 / 57

PSEN opII4H Series
Operating Manual PSEN opII4H Series
1003501-EN-02
14
Automatic restart
The OSSDs automatically switch to the ON state during operation under the following con-
ditions:
}
both OSSDs are wired correctly and
}
no error has occurred and
}
the protected field is clear and
}
at least 80 ms have elapsed since the switch to the OFF state.
[1] [2] [3] [4] [5]
POWER
OSSD
2 3
4
[6]
t
1
t t
t
Protected
field
Free
Interrupted
ON
OFF
ON
OFF
Fig.: Automatic start and restart timing diagram
Legende
[1] Safety light grid is switched on
[2] Check completed successfully, OSSDs in the ON state
[3] Protected field broken
[4] OSSDs in the OFF state
[5] Protected field is clear again, check for errors is restarted
[6] OSSDs in the ON state
t
1
Check is begun to determine whether the protected field is clear and whether
there are errors
t
2
Response time required for the OSSDs to switch to the OFF state (see Tech-
nical details [ 42] )
t
3
Minimum time that the OSSDs remain in the OFF state: 80 ms