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What Are Fast Inputs?

Fast inputs allow a high-speed application to get position information about the occurrence of an external event at a higher resolution than the cycle time. Thanks to the precise timing of external events, an application can improve its control algorithm, resulting in higher operating performance. Fast (or high-speed) inputs are digital inputs of a drive that are configured to latch the time at which they are triggered.

A position or time capture can be triggered either by the positive (rising) edge or by the negative (falling) edge of the digital input. The AKD Drive has two capture engines which can be freely linked to any input. These high speed inputs can be used in application which, when triggered, caused a drive position to be captured and reported back to the controller.

Only digital inputs 1 and 2 can be used as Fast InputsThe inputs are taken into account at each cycle depending on the system periodicity (for example each millisecond). Under certain circumstances this can be insufficient when more accuracy is needed, or if a quick response is required from the system. To fill the gap, a drive may have some Fast Input connections (generally one or two). When an event happens that triggers a Fast Input (e.g. when a sensor sends a rising edge), the detection of a signal occurs faster (which can be 1000 times more accurate than the system periodicity). Then the timestamp associated with this input can be provided to the IPC to take corrective action.

When using S300"Servostar 300 drive" See Servo Drive in Glossary or S700"Servostar 700 drive" See Servo Drive in Glossary, Fast input has to be enabled by setting the drive keywords IN1MODE to 26 and IN2MODE to 26. This can be achieve using DriveGUI configuration tool.

See the following sections for fast inputThe inputs are taken into account at each cycle depending on the system periodicity (for example each millisecond). Under certain circumstances this can be insufficient when more accuracy is needed, or if a quick response is required from the system. To fill the gap, a drive may have some Fast Input connections (generally one or two). When an event happens that triggers a Fast Input (e.g. when a sensor sends a rising edge), the detection of a signal occurs faster (which can be 1000 times more accurate than the system periodicity). Then the timestamp associated with this input can be provided to the IPC to take corrective action information specific to the motion engines.

Fast Inputs with Pipe Network Motion

Fast Inputs with PLCopen Motion

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