By H. H. Frey
SAFECOMP '92 advances the cutting-edge, reports reports of the prior years, considers the information now to be had and identifies the talents, tools, instruments and strategies required for the protection of laptop regulate platforms
Read or Download Safety of Computer Control Systems 1992 (Safecomp ' 92). Computer Systems in Safety-Critical Applications PDF
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Additional resources for Safety of Computer Control Systems 1992 (Safecomp ' 92). Computer Systems in Safety-Critical Applications
Sample text
1. Basic structure of the human localization system 26 important that the speed of the robot be not too high. Several experiments have been performed to quantify the perception of safe speeds by human subjects (Helander 1990, Karwowski and others 1987). Based on their results we limited the speed to 200 mm/s when human beings are in the working area. This is called the cooperation mode. If the intruder comes too close to the robot arm the movement is stopped. This is called the stop mode. Another behavior which is not yet implemented would be to change the robot's path in order to avoid the intruder.
6 Truth table of the depicted "majority voted output Si" circuit. 2 "Strongly-fail-safe" property So, because of its non safe failure rate, this mechanism is efficient from the safety point of view, it is not the same from the availability point of view in case of widely available requirements. Therefore, to improve this last measure, the only way consists in making use of the "majority voted output" circuit so that it can be checked on-line. As shown in figure 4, the "majority voted output Si" circuit is made from three subcircuits including both "strongly-fail-safe" CSI and some components used to achieve the "vote" function.
The goal is to make use of such systems easier, to avoid the drawbacks generated by off-line test phase and to obtain the best "costsafety" compromise. First of all, we introduce the scheme of a "strongly-fail-safe" basic cell without any off-line test equipments. The advantage is to obtain a "strongly-fail-safe" circuit which requires few components. Then, we suggest an architecture of a "strongly-fail-safe majority voted output" circuit designed from the "strongly-fail-safe" basic cell. The reliability, the safety and the availability of this "majority voted output" mechanism is evaluated.