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.
PLC. 1  See: Project loan certificate. 2  A mortgage-backed security issued by Ginnie Mae on mortgages for larger properties. As with all mortgage-backed securities, the coupons on guaranteed mortgage securities are paid out of the principal and interest on a pool of mortgages underlying the securities.