Title: +038=360.000-OU045T_04-PCD2.m4160 PLS SBC - IO Manual.pdf
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.5-46PCD2.B100Input/output circuits and terminal designationA7A6A5E5A4E4s u B D C PA3E3 E3A2E2E1E0A7A6E/A5 E/A4 E/A3 E/A2 E1 E0FuseI/O Bus24 VDCThe example shows E/A2 and E/A3 used as inputs and E/A4 and E/A5 used as outputsThe following applies for the inputs: Switch closed (input positive): Signal state = “1” = LED on Switch open:Signal state = “0” = LED offIt is recommended that each module should be separately protected