Pilz PSSu E F 4DO 0.5 User Manual
Page 14
Function description
Operating Manual PSSu E F 4DO 0.5(T)(R)
21316EN05
14
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The output's ability to switch will not be detected until the next time the output is
switched on/off.
Testing for shorts
}
A test is regularly carried out to check for shorts between the outputs.
}
For applications in accordance with Category 4, PL e and SIL 3, detection of shorts
between contacts must be guaranteed either via the on/off test or through other meas
ures (e.g. asynchronous switching). A short between contacts must be simulated during
commissioning.
WARNING!
When wiring an output with capacitance it is essential to note the pulse dur
ation, repetition period and scan time of the powerup test, otherwise the
load may switch on unintentionally.
Timing diagram
"1"-Signal
t2
t1
t1
t3
t1
t
t3
t1
U
"0"-Signal
}
t
1
Pulse duration on on test (see Technical details)
}
t
2
Cycle time of on test when test is repeated (ca. 4 ms)
}
t
3
Cycle time of on test under normal circumstances (ca. 5 min.)