Title: +038=360.000-OU045T_04-PCD2.m4160 PLS SBC - IO Manual.pdf
2 LEDs are directly triggered by the pure inputs. 2 LEDs are directly triggered by the pure outputs. 4 LEDs are triggered by the inputs of the combined inputs/outputs and therefore always indicate voltage status at the I/O terminal.If the combined I/Os are used as outputs, the following should be noted: The LEDs of combined outputs E/A2…E/A5 only light up when the output is high and a supply voltage of 24 V is connected to Uext.Mixing the combined inputs/outputsIf combined I/Os are used as inputs in source operation, i.e. with sending devices which either apply +24 V to the input or are open, the low status of an open input can be overwritten as high if the corresponding output at the same address is set in error. However, if the input is shifted to 0 V with a changeover contact and the corresponding output is set in error, the MOS-FET can be destroyed, as it is not short circuit protected. For this reason, only positive-switching contacts should be used.6-55PCD3.B100