1.   This has created the need for a highly integrated network of computer systems and programmable logic controllers.

2.   The use of computers or programmable logic controllers in systems which have a direct impact on safety obviously requires special care.

3.   By contrast, the sensor makes readings continuously and communicates information to a central process logic controller, which regulates oven temperature.

4.   Programmable logic controllers in each room contain input and output sensors that adjust the temperature and humidity levels every five minutes.

5.   The drying kiln is controlled by a programmable logic controller, or PLC, located in a room adjacent to the kiln.

6.   The wave patterns are controlled by a programmable logic controller, a sort of master control panel a short distance from the turbines.