Switching Of Loads; Switching Of Capacitive Loads - Siemens SIMATIC Operating Instructions Manual

Switching of Loads

E.1

Switching of Capacitive Loads

Switching of Capacitive Loads
If the electronic outputs of the 4/8 F-DI/4F-DO DC24V/2A PROFIsafe electronic module are
interconnected with loads that draw little current and have capacitance, the "short circuit"
error message can result. Reason: capacitances are not sufficiently discharged within the
assigned readback time during the self-test.
The following figure shows typical curves indicating the relationship between the load current
and switchable load capacitance for the assignable readback times.
Figure E-1
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
Relationship Between Load Current and Switchable Load Capacity for the 4/8 F-DI/4 F-
DO DC24V/2A PROFIsafe Electronic Module
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