Troubleshooting 7.3 No online connection to KUBES? The following error message may be displayed when you are trying to go online with the PLC (via V.24): Fig. 14: V.24-synchronisation error message If it does, please check whether: Ш the PLC is switched on, Ш the programming cable is connected to the PLC, Ш the programming cable is properly connected to the PC (check port! the standard port is COM1), Ш the cable is a genuine KUBES programming cable (part no.: 657.151.03). If all of the above points are okay, but the PLC still does not react, it could be that the PLC no longer accesses the port. In some cases, the PLC still does not react. The following causes are possible:
Ш Switch the supply voltage off and back on again. Ш PLC defective Ш program error (CPU no longer accepts KUBES’ online message) Ш wrong V.24 parameter settings 154