: Ensure all commissioning parameters are set.
The fault code "0A7991" seems to be specific and might relate to one of Siemens' product lines. Here are some general steps you might consider to find the information you're looking for:
: This often indicates a communication issue between the PLC and the drive. Check your network cables and ensures the PLC is sending the correct control word (bit 10 must be "1" for PLC control).
The drive's has a high-speed internal data bus (often referred to as the "internal DRAM bus" or "backplane communication"). This bus handles real-time data exchange between the microprocessor, memory, I/O interfaces, and firmware modules.
