We have several obsolete German dc motors on Lenze vfds we are going to upgrade. Some of these motors have encoders on them and they are all on a Siemens Simatic S5 PLC.
We are going to go with ac motors and newer vfd's. Management is wanting to keep the Simatic S5 PLC. If we keep this plc do I need to have any programming changes done to the plc to recognize/communicate with the new vfd's? Will the Simatic S5 PLC be compatible with newer vfds? Finally would it just be wiser to upgrade the plc? We are not upgrading the whole production line just the palletizing section of this production line. This production line makes paper bags.