Hormonal contraception is highly effective: when taken on the prescribed schedule, users of steroid hormone methods experience pregnancy rates of less than 1% per year. Perfect-use pregnancy rates for most hormonal contraceptives are usually around the 0.3% rate or less.
A programmable logic controller (PLC), or programmable controller is an industrial digital computer which has been ruggedised and adapted for the control of manufacturing processes, such as assembly lines, or robotic devices, or any activity that requires high reliability control and ease of programming and process fault diagnosis.
It is a limited (liability) company whose shares may be freely sold and traded to the public (although a plc may also be privately held, often by another plc), with a minimum share capital of Â£50,000 and the letters PLC after its name.Similar companies in the United States are called publicly traded companies. PLC can be either an unlisted or listed company on the stock exchanges. In the United Kingdom, a public limited company usually must include the words public limited company or the abbreviation PLC or plc at the end and as part of the legal company name.