33 Appendix
33.4 Definitions for short-circuit proof outputs (in accordance with IEC/EN 61131-2)
282
XN300 slice modules
06/16 MN050002 EN
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33.4 Definitions for short-circuit proof outputs (in accordance with IEC/EN 61131-2)
The following applies to outputs that the manufacturer declares to be short-
circuit proof:
•
The output must continue to work with all output currents that are higher
than Ie max. but less than two times the rated operational current Ie.
Moreover, the output must be able to withstand temporary overloads.
The manufacturer must provide specifics regarding temporary overload
scenarios.
•
The protective device must trip for all foreseeable output currents that
are more than 20 times the rated value. After the protective device is
reset or replaced, the PLC system must continue to work normally.
•
It may be necessary to repair or replace the module after the presence
of output currents within a range of 2 to 20 times or temporary overloads
that exceed the limits specified by the manufacturer (see first bullet
point).
•
No fire or electric shock hazards must arise when there is an overload of
two times Ie for 5 min. The highest temperature rise in the I/O insulation
must not exceed the values specified in 4.4.2. immediately after each
overload.
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