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Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
327
Switching capacitive and inductive loads
E
Switching capacitive loads
SM 326; DO 10 x DC 24V/2A, SM326; DO 8 x DC 24V/2A PM may generate a "short-circuit
to L+ or output driver failure" error message if outputs without series diodes are
interconnected with low-current loads with capacitive element. Reason: insufficient discharge
of capacitance within the 1-ms readback time during self-test.
The figures below show a typical curve representing the correlation between load impedance
and switchable load capacitance for a supply voltage of 24V DC.
Switching behavior SM 326; DO 10 x DC 24V/2A
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Figure E-1
Relationship between load resistance and switchable load capacitance for SM 326; DO 10 x DC 24V/2A