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Industrial position sensor

  • US 6,377,186 B1
  • Filed: 04/19/2000
  • Issued: 04/23/2002
  • Est. Priority Date: 07/31/1997
  • Status: Expired due to Term
First Claim
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1. In a spatial positioning monitor comprising first and second functional units, an integrity verification circuit comprising:

  • first and second self-monitor devices, wherein said first functional unit includes a first optical transmitter and said first self-monitor devices comprises a first optical receiver optically coupled to the first optical transmitter to generate a first self-monitor signal indicating integrity of the first optical transmitter, and wherein said second functional unit includes a second optical receiver and said second self-monitor devices comprises a second optical transmitter optically coupled to the second optical receiver to generate a second self-monitor signal indicating integrity of the second optical receiver; and

    a controller programmed to scan the self-monitor signals and indicate a fault condition in response to any of the monitor signals that differ from predefined acceptable boundaries.

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