SYSTEM FOR MONITORING ABNORMAL SYSTEM OPERATIONS IN A SYSTEM HAVING A CENTRAL STATION AND A PLURALITY OF REMOTE STATIONS

• US 3,697,953 A
• Filed: 12/28/1970
• Issued: 10/10/1972
• Est. Priority Date: 12/28/1970
• Status: Expired due to Term

• Current Assignee: Frank H. W. Schoenwitz
• Original Assignee: Frank H. W. Schoenwitz
• Inventors: Schoenwitz, Frank H. W.
• Primary Examiner(s): Pitts, Harold I.
• Application Number:
  US05/101,563
• Time in Patent Office: 652 Days
• Field of Search: 340/163
• US Class Current: 340/3.4
• CPC Class Codes: G05D 23/1905 associated with tele control
• CPC Class Codes: H04Q 9/14 Calling by using pulses

Abstract

A system for alarming abnormal operations in a system having a central station and a plurality of remote stations connected by a transmission channel wherein operation of remote equipment is accomplished by sending messages to and from the central station. A logic circuit means is connected to receive outputs of system variables which are used in a prearranged manner to provide an alarm output when the reported condition status doesn'"'"''"'"'t agree with the command intent. To minimize alarm annunciations not all abnormal system conditions will be alarmed, provided the reported status agrees with the command intent. The variables are; the type of commands sent from the central station, how much time has elapsed since the command has been sent, whether the command had actuated equipment at the remote station, whether the operating condition at the remote station had changed status as a result of a change in the equipment, and the present status of the operating condition at the remote station.

Claims

1. In a system for indicating system operations, comprising:

a central station comprising, first message transceiver apparatus for sending and receiving messages, and processing apparatus connected to said transceiver for processing messages received by said central station comprising logic circuit means having a plurality of input circuits and a plurality of output circuits, indication apparatus, and means connecting said input circuits to said processing apparatus and said output circuits to said indication apparatus, at least one remote station connected to said central station comprising;

second message transceiver apparatus for sending and receiving messages, control means adapted to energize condition changing means, change of status responsive means adapted to respond to a change in the condition being changed, status responsive means adapted to respond to a status of the condition being changed, and means connecting said control means, said change of status responsive means and said status responsive means to said second message apparatus to provide a reporting message reporting a state of operation of said control means, a status of said condition and a change in the status of said condition, whereby upon said processing apparatus receiving said reporting message a first signal indicative of said state of operation of said control means, a second signal indicative of said status and a third signal indicative of said change in status is fed into said input circuits of said logic means to indicate at said indication apparatus the operational status of said remote station.

2. The invention of claim 1 wherein:

said reporting message comprises a plurality of bits in binary form, one of said bits being indicative of said state of operation of said control means, another of said bits being indicative of said status of said condition, and a third of said bits being indicative of said change in the status of said condition.

3. The invention of claim 1 wherein said central station comprises, program apparatus for initiating operational command messages to be sent to said remote stations by said first message transceiver apparatus, and means connecting said program apparatus to said input circuits of said logic circuit means for providing to said logic circuit means a fourth signal indicative of the type of command and a fifth signal indicative of whether the command is a new command.

4. The invention of claim 3 comprising timer apparatus connected to said program apparatus wherein said logic circuit initially upon a new command being sent by said program apparatus makes use of said first, second, third, fourth and fifth input signals and upon said predetermined time period expiring said logic circuit makes use of only said first, second and third input signals received from said remote station through said message processing apparatus.

5. The invention of claim 4 wherein, said logic circuit comprising BCD to decimal decoder means for receiving said firSt, second, third, fourth and fifth signals in binary form, said indication apparatus comprising;

on and off condition status indications, new alarm apparatus for indicating abnormal system operations reported by a first report made of a combination of input signals and old alarm apparatus for indicating abnormal system operations reported after said first report.