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On a rotary application with absolute multi-turn feedback, it's possible to run over the feedback unwind. If the machine has a non-binary gear ration (e.g. 3:1), its period is not an integer divisor of the encoder period, allowing the position to not be the same after a power cycle. In other words, it may be shifted by the fraction of the ratio.

On a rotary application with an absolute multi turn feedback it's possible to run over the feedback unwind. If the gear between motor and application is binary nothing happens. If the application has a non binary gear ratio, the position after a restart of the drive may not be same. To readjust this situation the FB1.OFFSET needs to be corrected. On a producing machine it's not usable if, after every power cycle, an electrician has to recheck the position of the axis. For this situation the following auto correction has been implemented in the PLC code.