Joe Grove Posted September 8, 2011 Report Share Posted September 8, 2011 I have a small issue while sending a move command to a stepper drive from a V130-33-TR34. We have a strange occurrence at a few speeds. We are sending a pulse train at 8650 speed with a distance of 20000 -this is basically a jog move to until a sensor is activated. Once the sensor is tripped we move a predefined distance (600 pulses) at the same speed of 8650. The way this is done is that in the ladder logic the jog move is started based on the rising edge of an input to the plc then on the rising edge of the sensor input a second move command is sent with the new distance. We do not issue a stop between the two move commands, we simply issue a second command while the first move is in motion creating a single smooth trapezoidal move. This works great with the exception of a handful of speeds (frequencies) 8650 being one of them. When 8650 is used the second move (600 pulses) is ignored and or is altered and overshoots the gap sensor and another gap is sensed with another rising edge and the system goes into a cyclic process with no end. If we use 8650 as the speed for the jog move and another speed (ex 8649) for the second move (600) the system performs perfect and stops exactly where expected. Quote Link to comment Share on other sites More sharing options...
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