6 Jul 2002 mikegotis   » (Journeyer)

I built a tiny PLC to control X-Y-Z axes driven by hobby servos interfaced to a miniature SSC. Multiple axes can achieve singular or plural states. Expansion is provided for up to 8 axes. An autonomous Light Curtain ALC safety feature is made from infrared beam detectors wired to the MCU. Breaking the transmitter-receiver beam results in safety effects, which are hardware (and/or software) programmed to OSHA regulations. ALC options halt the zaxis RAM, return the RAM to a previous state, RAM home, or move to a new location.

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