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English to Russian translations [PRO] Tech/Engineering / robot
English term or phrase:Prefetch time
PREFETCH TIME affects the point in time at which the controller starts to plan for the motion through a fly-by point. If the planning time is too short, a fly-by point becomes a stop point. This generates an error called "50024 Corner path failure". Increasing the parameter PREFETCH TIME may solve the problem, when the planning time is too short because of high CPU loading. However, it will not solve the problem when the error occurs because too many fly-by points were placed very closely together, or because of incorrect use of instructions, e.g. a fly-by point followed by a WaitDI instruction. Normally PREFETCH TIME should only be increased when the fly-by point is really needed in the application. When it is not really needed, change the fly-by point to a fine point.
There is a drawback when increasing the PREFETCH TIME. The difference between the position of the executed RAPID instruction and the current position of the manipulator will increase. This means that after pressing stop during program execution, the program counter on the teach pendant may show an instruction that has not yet affected the manipulator. When starting again, the manipulator continues along the original path.