System and method for programmable sequence control
Patent 3978454 Issued on August 31, 1976. Estimated Expiration Date: 
August 31, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 31, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorAssigneeApplicationNo. 05/481267 filed on 06/20/1974US Classes:700/1GENERIC CONTROL SYSTEM, APPARATUS OR PROCESSExaminersPrimary: Shaw, Gareth D.Assistant: Rhoads, Jan E. Attorney, Agent or FirmInternational ClassG05B 19/05 (20060101)AbstractA programmable sequence controller for controlling a machine or process operation including a main low-security programmed sequencer and a high-security programmed sequencer through which selected outputs from the main sequencer must pass before being allowed to control the machine or process operation. This high-security sequencer generates a sequence of steps which relate to machine or process commands under conditions critical to the operation of the machine or process and is controlled in a predetermined order. Any critical output requested by the main sequencer is caused to initiate sequencing by the high-security sequencer and is tested by the high-security sequencer as to the propriety of the generation of a permitted output to the machine or process. The high-security sequencer in this manner effects an improved interlocking between the various critical output commands and actual operative conditions.Other References
| |
