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

The control method must be selected among relay-based circuits, special equipment, programmable logic controller (PLC) and newly developed electronic equipment. This paper is a concentrated expression of PLC and its experience in five years' practice. Strong and weak, positive and negative practices are

Discussed it. Use programmable controller or weather forecast to help decision-making.

When planning a system based on PLC, the most important decision is which type of processor to choose. The extra cost of error means even needs to be used for the transformation of brand-new equipment. Most small processors overestimate the possibility of programming errors. There are several ways to choose PLC. Unfortunately, most of them focus on the electronic edge of PLC and the maximum allowable counting signal. They are not involved in analysis to determine the possible special needs of user programs or communications.

According to several existing methods, practical experience and the future trend of PLC, a new method is developed. Ahti Mikkor has accumulated experience by participating in more than 15 automation projects. These projects include developing a power consumption monitoring system for Kunda Nordic Cement Plant, updating the test ship to a flowmeter, repairing the turbine safety protection system of Ahtme Power Plant, and Rakvere and P? Lva, the wastewater treatment plant of monitoring system is in J town? The development of Jiewa and central heating network is in Tartu.