| 摘要 |
<p>The invention relates to a method of operating a controller configured to control an independent control system (3). The independent control system (3) comprises at least two units wherein at least one of said units is designed to operate as a master unit (26, 30, 34, 62, 72) and wherein at least one of said units is designed to operate as a slave unit (2, 4, 6, 8, 60, 70), wherein at least one of said at least one master unit (26, 30, 34, 62, 72) further is configured as an access device, which can communicate with one or more external control units (64, 74, ECD, ECD1, ECD2, ECD3, ECDn), which are external to said first independent control system 3.
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