FAQ: What is the procedure to setup a rotary axis in MP controllers using MotionWorks?
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A rotary axis can be selected by setting bit 5 in the Fixed Parameter 17, Axis Selection. The axis machine cycle is set by the Fixed Parameter 23, Infinite Length Axis Reset Position (POSMAX).
As the axis rotates, the actual position register, ILxx08, is reset back to zero every time the POSMAX value is exceeded. It is important to note that the position reference register, OLxx12, is not affected by the rotary axis selection. If positioning motion command is selected, OWxx20=1, the user must keep track of the number of cycle turns and include them in the position reference register. For example, if POSMAX=8192cts, in order to move the axis 2.5 machine cycles, a position command of 20480cts must be issued. After the position is reached the actual position register, ILxx08, will read 4096cts.
Related Registers:
1. POSMAX Monitor, ILC01C register, contains the axis infinite length value.
2. The Number of POSMAX turns is shown in ILC01E register and can be reset to the number of turns assigned by register OLC030 when setting bit 1 in OWC02D, Position Control Flags Register.
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