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modern machinery includes mechanical and electronic parts. The overall function depends on the "balance" between these components. The initial plan and solution choice play an important role in the final result.

the choice of p>In control method must be made among relay-based circuits, special equipment, programmable logic controllers (PLC) and newly developed electronics. This article is a concentrated collection of PLCs and experiences used together with PLCs in five years' practice. Strong and weak edges, positive and negative practices are

discussed. Using programmable controllers or formed weather advice helps policy making.

most important decisions in planning a PLC-based system are The type of the processor to choose. The extra cost of error means is even needed for the modification of brand-new equipment. Most small processors overestimate the possibility of programming with errors. There are several methods of PLC selection. Unfortunately, most of them focus on the electronic edge of PLCs and the maximum allowable count signal. They don't intervene in the analysis to determine the possible special needs for user programs or communications.

according to several existing methods, practical experience and future trends, a new method of PLC has been developed. Ahti Mikkor gained his experience in more than 15 major automation projects through his participation. These projects include the development of power consumption monitoring system as Kunda Nordic cement plant, updating the test boat to flowmeter, repairing the turbine safety protection system of Ahtme power plant, and the water treatment plant in the town of Rakvere and P? Lva, the wastewater treatment plant of the monitoring system is in the town of j? Geva and the development of central heating network are in Tartu.