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Programmable Limit Switch (PLS)
Absolute Position Transducer
A Programmable Limit Switch is an electronic cam switch that duplicates the functions of either a rotary cam switch or limit switches actuated by linear machine movement. A PLS system consists of a solid-state programmable control unit and a position transducer. Autotech exclusively used resolvers as position transducers. The resolver is coupled to the moving shaft and produced an analog position signal. This position signal is then converted to digital format inside the control unit. Thereafter the position is displayed on the front of the unit and also compared to the user program "dwell" settings. As the actual position reaches the preprogrammed set points, the outputs are turned "ON" and "OFF". The dwell settings are easily programmedfrom the keypad.
Autotech's PLS's offer many advanced features such as Zero Offset Adjustment, Dynamic Zeroing and Programmable Rate Offset. Zero Offset allows the operator to easily align the "resolver zero" to the "machine zero". Dynamic Zeroing (Mod Z) allows modification of the zero reference for selected channels based on an external trigger independent of the actual resolver position. Programmable Rate Offset(ROF) allows automatic adjustments of set points to compensate for machine speed changes.
The Autotech microprocessor-based PLS's use a patented DMA technique employ "look up" tables to achieve the fastest machine operations in the industry: 20,00 set points in 85 microseconds.
Autotech offers a wide spectrum of PLS's. To size a PLS for your application.Please refer to the Programmable Limit Switches - Summary of Features
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