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Position Calculation


Sina.Sattari
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Several PMAC memory locations are used when generating “machine position” registers for a given application. For axis number one the following registers can be used, M161->D:$0028 ;commanded postion (cts/[Ix08*32]) M162->D:$002B ;actual position (cts/[Ix08*32]) M164->D:$0813 ;position bias (cts/[Ix08*32]) M167->D:$0813 ;master position (cts/[Ix08*32]) M169->D:$0046 ;compensation correction (cts/[Ix08*32]) M174->D:$0840 ;following error (cts/[ix08*32])in memory map! Machine Position = Actual Position + Position Bias + Compensation Correction If using the handwheel offset mode (bit 16 of Ix05 is set i.e. Ix05=$010730) then, Machine Position = Actual Position + Position Bias +Compensation Correction – Master Position Following Error = Commanded Position – Actual Position+Bias+Compensation+Home Offset Mx68 is the register that people have used to monitor and plot the output of the PID servo loop. However, some people want to put the motor in open-loop mode and calculate the output themselves and put it in a register. Mx79 is the register to do this.
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