FASTBUS Rack Alarms and Limits

A FASTBUS based data acquisition system is under construction at the Fermi National Accelerator Laboratory for the Collider Detector at FERMILASB (CDF). This system is likely to have in the area 35 to 40 racks, 25 of which may house up to 3, FASTBUS crates, associated power supplies and cooling aparatus. Such a rack may represent as much as $175,000. Th is paper describes a rack protection system, designed to greately reduce the possibility of large scale system damage, which will add an additional cost of approximately 1 to 2 %.