<p>The manufacturing facility has pallets Ä10Ü moved, for example on rollers, between workstations. Each station has a controller Ä14Ü that accepts inputs from sensors Ä18Ü and generates outputs to actuators. The controllers a programmed watchdog function built in. Each of the controllers is connected onto a communications bus Ä22Ü and this is linked to a central operator station Ä24Ü.</p>
