Abstract
A distributed microcomputer-based automation system, which has been applied to a new board mill is described. The automation system used was based on several independent data processing units with dedicated functions. The data processing units were interconnected with serial buses which used HDLC communication protocol. The operating stations were based on a colour visual display unit which made a new type of control room concept possible. The substations and the buses are backed up by standbys to ensure a sufficiently high availability as maintenance staff were unavailable outside normal working hours. The board mill where the system was applied for the first time called for special solutions, which made a digital distributed system the natural choice. A short account of the experience with the system is also given.
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