The invention relates to an input/output channel control block that comprises a number of successive input/output modules. The first is a control master module and the subsequent ones are expansion slave modules. Each expansion slave module comprises a processing logic unit as well as respective first...http://www.google.com.hk/patents/US7869886?utm_source=gb-gplus-share專利 US7869886 - Control block with a point-to-point communication link between a control master module to be connected to a data bus and expansion slave modules
