| 摘要 |
PCT No. PCT/GR94/00021 Sec. 371 Date May 1, 1995 Sec. 102(e) Date May 1, 1995 PCT Filed Sep. 2, 1994 PCT Pub. No. WO95/06908 PCT Pub. Date Mar. 9, 1995The present invention relates to a fail-safe control interface including branches for providing signals having a safe state or a non-safe state. Each branch comprises inputs for receiving at least two binary control signals (Si, Si*); a source of a non-safe state (Fe) connectable through a basic chain of elements (14, 15) to an output (Oi) when the control signals realize a predetermined combination; a concurrent checker (17) providing an error detection signal (g1, g2) if the inputs of a pair of its inputs are at predetermined states; and means (14*) for providing a first input of said pair of inputs with a signal corresponding to the state of said output and the second input of said pair of inputs with a signal corresponding to the output of a duplicate chain of the basic chain, this duplicate chain reacting like the basic chain in response to the control signals. |
