text: <s>[INST] PF525 Multi Do the vfds in a multi drive configuration need to be the same firmware? I'm having a problem replacing the master with fw rev 7. The slaves are fw rev 4. [/INST] I have not found any reference suggesting firmware revision would cause an issue between drives. What kind of issue are you seeing? I did find this in technote QA61747 (TechConnect Required): If replacing a drive, make sure that the Firmware and Horsepower rating of the replacement drive is the same as the drive being replaced or update that information in the off-line RSLogix / Studio 5000 project before downloading the configuration to that drive. A technote showing parameters to be set in the drives themselves: QA23228 I believe the parameters must be modified on the Master, and power cycled, prior to being connected to the slave devices. Regards, RM \\n </s>