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CPU 317T: Technology Functions
A5E00251798-03
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4.7.5 Motion laws to VDI
4.7.5.1 Working ranges and motion transitions
The VDI concept distinguishes between Working ranges and motion transitions:
• Working ranges correspond with the steps in a process. VDI distinguishes
between four working ranges.
• Motion transitions represent transitions between working ranges. Although
these are not directly relevant to the process, they must meet certain marginal
conditions, e.g. constant velocity and acceleration.
Working ranges
The VDI concept distinguishes between the following working ranges:
Working range Velocity (v) Acceleration (a)
R Dwell = 0 = 0
V Constant velocity ≠ 0 = 0
U Reversal = 0 ≠ 0
B Motion ≠ 0 ≠ 0