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Machine control system with machine serializing and safety circuits

  • US 4,071,911 A
  • Filed: 04/09/1976
  • Issued: 01/31/1978
  • Est. Priority Date: 04/22/1975
  • Status: Expired due to Term
First Claim
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1. A multiplexing machine control communications system for controlling a plurality of machines from a programmable controller, comprisinga multiplexer controller terminal for receiving condition-defining information signals representing the operational functions of a plurality of independently operable multifunctioning machines and transmitting predetermined command signals to control selected functions of each of said machines,a programmable controller coupled to said multiplexer controller terminal to provide a source of said predetermined command signals for controlling said machines in response to said condition-defining information signals,a plurality of multiplexer machine terminals, one coupled to each one of said plurality of independently operable multifunctioning machines to transmit condition-defining information signals responsive to the operational functions of a machine coupled thereto and to receive in response thereto selected ones of said predetermined command signals,an input and output converter coupled between said multiplexer machine terminal and a machine coupled thereto for coupling said information and command signals therbetween,respective transmission lines for connecting said multiplexer controller terminal in parallel with each of said multiplexer machine terminals,said multiplexer machine terminals operating independently of each other for communication between said multiplexer controller terminal and each of said multiplexer machine terminals, andsafety circuit means for monitoring the transmission of data on said transmission lines and providing inhibit signals for inhibiting data transfer within the system when transmission on said lines is interrupted.

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