Wagner's network in Africa faces uncertain future

What does the Russian mercenary group's failed mutiny mean for its fighters in African countries?

from BBC News - Home https://ift.tt/NvKCGpw

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1.Introduction to PLC

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  Introduction This knowledge is meant to supply you with basic information on PLC . Control engineering has evolved over time. In the past humans were the main method for controlling a system. More recently electricity has been used for control and early electrical control was based on relays. These relays allow power to be switched on and off without a mechanical switch. It is common to use relays to make simple logical control decisions.  The development of low cost computer has brought the most recent revolution, the Programmable Logic Controller (PLC). The advent of the PLC began in the 1970s, and has become the most common choice for manufacturing controls. PLCs have been gaining popularity on the factory floor and will probably remain predominant for some time to come. Most of this is because of the advantages they offer. ·            Cost effective for controlling complex systems. ·          Flexib...
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5.UP Counter, DOWN Counter, Up-Down Counter

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