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Devices, systems, and methods regarding a PLC

  • US 8,417,847 B2
  • Filed: 08/08/2007
  • Issued: 04/09/2013
  • Est. Priority Date: 08/08/2006
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a first module of a first chain of modules, each adjacent pair of said first chain of modules communicatively coupled in series, said first module communicatively coupled to a programmable logic controller (PLC), said first module comprising a transmission circuit and a reception circuit, said first module adapted to communicate with said PLC via 8B/10B encoded frames, a frame of said 8B/10B encoded frames comprising a message type field of a size of eight bits, a value stored in said message type field indicative of content of a data field of each of said frames, said message type field following a first ordered sequence of fields comprised by said 8B/10B encoded frames, said first ordered sequence of fields including, in the following order, a preamble field, a start-of-frame field, a destination address field of a size of eight bits, a length field of a size of eight bits and specifying the number of bytes in the message starting with the destination address and ending with a cyclic redundancy check field, and a source address field of a size of eight bits, and following the message type field, a second ordered sequence of fields comprised by each frame, said second ordered sequence of fields including, in the following order, a data field, the cyclic redundancy check field and an end of frame field, wherein said destination address field contains a value that is indicative of an un-configured address during address assignment of said first module, said first module configured to store the un-configured address before address assignment of said module by said PLC and said first module is configured to store an assigned address value after address assignment of said module.

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