RELIABILITY CONTROL DEVICE AT INSTALLATIONS

摘要

The invention relates to a reliable command unit for installations. In accordance with the invention, commanding is allowed only if two simultaneous conditions are met. By a cluster command organization, the unit allows for the commanding of a large number of relays using a small number of control interfaces and connecting wires. The contact status and their control may be simultaneously read. In addition, the unit allows the replacement of faulty interfaces, while maintaining the status of controlled contacts by implementing a self-maintenance technique.