Multiplexed control subsystem for sensor based systems

• US 4,153,945 A
• Filed: 06/20/1977
• Issued: 05/08/1979
• Est. Priority Date: 06/20/1977
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Kantner, Robert F., Actor, Elliot J.
• Primary Examiner(s): Shaw, Gareth D.
• Assistant Examiner(s): Sachs, Michael C.
• Application Number:
  US05/807,841
• Time in Patent Office: 687 Days
• Field of Search: 364/518, 364/551, 364/200 MS File, 364/900 MS File
• US Class Current: 714/47.1
• CPC Class Codes: G06F 13/22 using successive scanning, e.g. polling G06F13/24 takes precedence

Abstract

A sensor based system, such as a building management system, includes a central processor and an associated subsystem comprising at least a central panel interconnected with a plurality of remote panels, each of the remote panels being capable of further interconnection with a variety of devices for monitoring and control purposes. The subsystem is essentially a digital input/digital output (DI/DO) multiplexer comprising a central panel and from one to fifty remote panels, as an example. A simplified interconnection technique is provided in the subsystem for achieving efficient addressing of the remote panels and their associated sensor devices together with transmission of control and monitoring information. Control signals and status or other indications are handled by manual or computer intervention. Input/Output (I/O) cards are included that provide for all functions required for interfacing the multiplexer subsystem to the individual sensor devices.

Claims

1. A sensor based system for monitoring sensor devices and issuing commands comprising:

a central processing unit, said central processing unit having program facilities, storage facilities and sensor interface facilities and said central processing unit further having address signal generating and command signal generating facilities as well as data signal analysis facilities;

a central panel unit, said central panel unit and said central processing unit being operable to control said system on a mutually exclusive and independent basis, said central panel unit having manual address signal generating means, manual command signal generating means, mode selection means for selecting at least (1) a manual/computer mode, wherein said system is controllable manually by an operator from said central panel unit or automatically by said central processing unit but on a mutually exclusive basis and (2) a computer only mode wherein said system is controlled solely by said central processing unit, said central panel unit further having first indication means for indicating addresses manually selected and second indication means for manifesting sensor status (data) indications;

system priority means operable when said mode selection means is in the manual/computer mode to enable control either by an operator from said central panel unit or by said central processing unit, but not both concurrently and said priority means having facilities for resolving attempts to simultaneously control the system from both said central processing unit and said central panel unit by establishing priority of computer addresses and commands over addresses and commands manually entered from said central panel unit, said priority means being further operable when said mode selection means is in the computer only mode to fully inhibit control from said central panel unit;

at least one remote panel unit, said remote panel unit having an associated plurality of addressable sensor input/output cards, said remote panel unit and each of said addressable sensor input/output cards having address decode circuits, command decode circuits, and data transmission circuits for use in conjunction with individual sensor devices interconnected with said sensor input/output cards, and said remote panel unit having address signal selection means for pre-establishing individual unique addresses for said remote panel unit and the sensor input/output cards associated with said remote panel unit;

an address bus, said address bus being interconnected with said central processing unit, said central panel unit and said at least one remote panel unit and its said associated input/output cards and said interconnected sensor devices for transmission of address signals;

a command bus, said command bus being interconnected with said central processing unit, said central panel unit, and said at least one remote panel unit for transmission of command signals;

a data bus, said data bus being interconnected with said central processing unit, said central unit and said remote panel unit for transmission of data signals; and

sequencing means in said system, said sequencing means providing a sequence of operations when said central panel mode selection means is in the said (1) manual/computer mode and said system is being controlled either by an operator from said central panel unit or automatically by said central processing unit or (2) in said computer only mode, when said system is being controlled solely by said central processing unit, said sequence consisting of (A) generating address signals over said address bus for selection of an individual remote panel unit and an individual sensor device associated with said individual remote panel unit (B) transmitting data signals over said data bus from the sensor device selected through its associated remote panel unit, and said central panel unit to said central processing unit (C) analyzing said data signals in said central processing unit (D) transmitting command signals over said command bus to said selected sensor device and (E) transmitting further data signals from said selected sensor device to said central processing unit.

2. A sensor based system as claimed in claim 1, wherein:

said system is arranged for monitoring and control of building facilities, comprising heating, ventilating, or air conditioning facilities; and

wherein

said sensor devices include building facilities devices comprising fan motors, lighting panels, heating panels, compressor motors.

3. The system of claim 1, further comprising:

strobe means in said central processing unit for controlling the initiation and continuation of an addressing operation in said system; and

write address means in said central processing unit effective only when said strobe means has been activated to address said remote panel units and their associated input/output cards and interconnected sensor devices.

4. The system of claim 1, wherein:

said first indication means comprises a lighted display panel for manifesting the address that is active.

5. The system of claim 1, wherein:

said second indication means comprises indicators for manifesting status identified as latch status indicative of the status of a latch in an individual sensor input/output card, power good indicative of a valid address having been entered, and proof and bypass indicative of the status of external contacts.

6. A sensor based system for monitoring sensor devices, comprising:

a central processing unit, said central processing unit having program facilities, storage facilities and sensor interface facilities and said central processing unit further having address signal generating facilities as well as data signal analysis facilities;

a central panel unit, said central panel unit and said central processing unit being operable to control said system on a mutually exclusive and independent basis, said central panel unit having manual address signal generating means, manual command signal generating means, mode selection means for selecting at least a (1) manual/computer mode wherein said system is controllable manually by an operator from said central panel unit or automatically by said central processing unit but on a mutually exclusive basis and (2) a computer only mode, wherein said system is controlled solely by said central processing unit and said central panel unit further having first indication means for indicating addresses manually selected and second indication means for manifesting sensor status indications;

system priority means operable when said mode selection means is in the manual/computer mode to enable control either by an operator from said central panel unit or said central processing unit but not both concurrently and said priority means having facilities for resolving attempts to simultaneously control the system from both said central processing unit and said central panel unit by establishing priority of computer addresses and commands over addresses and commands manually entered from said central panel unit, said priority means being further operable when said mode selection means is in the computer only mode to fully inhibit control from said central panel unit;

at least one remote panel unit, said remote panel unit having an associated plurality of addressable sensor input/output cards, said remote panel unit and each of said addressable sensor input/output cards having address decode circuits and data transmission circuits for use in conjunction with individual sensor devices interconnected with said sensor input/output cards and said remote panel unit having address signal selection means for pre-establishing individual unique addresses for said remote panel unit and the sensor input/output cards associated with said remote panel unit;

an address bus, said address bus being interconnected with said central processing unit, said central panel unit and said at least one remote panel unit and its said associated input/output cards and said interconnected sensor devices for transmission of address signals

a data bus, said data bus being interconnected with said central panel unit and said remote panel unit for transmission of data signals; and

sequencing means in said system, said sequencing means providing a sequence of operations when said central panel mode selection switch is in the said (1) manual/computer mode and said system is being controlled either by an operator from said control panel unit or automatically by said central processing unit or (2) in said computer only mode when said system is being controlled solely by said central processing unit, said sequence consisting of (A) generating address signals over said address bus for selection of an individual remote panel unit and an individual sensor device associated with said individual remote panel unit (B) transmitting data signals over said data bus from the sensor device selected through its associated remote panel unit, and said central panel unit to said central processing unit and (C) analyzing said data signals in said central processing unit.

7. A sensor based subsystem for monitoring sensor devices and issuing commands comprising:

a central processing unit, said central processing unit having program facilities, storage facilities and sensor interface facilities and said central processing unit further having address signal generating and command signal generating facilities as well as data signal analysis facilities;

a central panel unit, said central panel unit and said central processing unit being operable to control said system on a mutually exclusive and independent basis, said central panel unit having manual address signal generating means, manual command signal generating means, mode selection means for selecting at least a (1) manual mode wherein said system is controlled solely from said central panel unit, and (2) a manual/computer mode wherein said system is controllable manually by an operator from said central panel unit or automatically by said central processing unit but on a mutually exclusive basis, and said central panel unit further having first indication means for indicating addresses manually selected and second indication means for manifesting sensor status (data) indications;

system priority means operable when said mode selection means is in the manual/computer mode to enable control either by an operator from said central panel unit or by said central processing unit, but not both concurrently and said priority means having facilities for resolving attempts to simultaneously control the system from said central processing unit and said central panel unit by establishing priority of computer addresses and commands over addresses and commands manually entered from said central panel unit, said priority means being further operable when said mode selection means is in the manual mode to fully inhibit control by said central processing unit;

at least one remote panel unit, said remote panel unit having an associated plurality of addressable sensor input/output cards, said remote panel unit and each of said addressable sensor input/output cards having address decode circuits, command decode circuits, and data transmission circuits for use in conjunction with individual sensor devices interconnected with said sensor input/output cards and said remote panel unit having address signal selection means for pre-establishing individual unique addresses for said remote panel unit and the sensor input/output cards associated with said remote panel unit;

an address bus, said address bus being interconnected with said central processing unit, said central panel unit and said at least one remote panel unit and its said associated input/output cards and said interconnected sensor devices for transmission of address signals;

a command bus, said command bus being interconnected with said central processing unit, said central panel unit and said at least one remote panel unit for transmission of command signals;

a data bus, said data bus being interconnected with said central panel unit and said remote panel unit for transmission of data signals; and

sequencing means in said system, said sequencing means providing a sequence of operations when said central panel mode selection switch is in the said (1) manual mode and said system is being controlled solely by an operator from said central panel unit or (2) in said manual/computer mode when said system is being controlled either by an operator from said central panel unit or automatically by said central processing unit, said sequence consisting of (A) generating address signals from said central panel for activation of said first indication means and transmission over said address bus for selection of an individual remote panel unit and an individual sensor device associated with said individual remote panel unit (B) transmitting data signals over said data bus from the sensor device selected through its associated remote panel unit to said central panel unit for activating said second indication means (C) after analysis by an operator, transmitting command signals from said central panel unit over said command bus to said selected sensor device and (D) transmitting further data signals from said selected sensor device to said central panel unit for further activation of said second indication means.

8. A sensor based system comprising:

a central processing unit, said central processing unit having program facilities, storage facilities and sensor interface facilities and said central processing unit further having address signal generating and command signal generating facilities as well as data signal analysis facilities;

a central panel unit, said central panel unit and said central processing unit being operable to control said system on a mutually exclusive and independent basis, said central panel unit having manual address signal generating means, manual command signal generating means, mode selection means for selecting (1) a manual mode wherein said system is controlled solely by an operator from said central panel unit, (2) a manual/computer mode wherein said system is controllable both manually from said central panel unit or automatically by said central processing unit but on a mutually exclusive basis, and (3) a computer only mode wherein said system is controlled solely by said central processing unit, and said central panel unit further having first indication means for indicating addresses manually selected and second indication means for manifesting sensor status (data) indications;

system priority means operable when said mode selection means is in the manual/computer mode to enable control either by an operator from said central panel unit or by said central processing unit but not both concurrently and said priority means having facilities for resolving attempts to simultaneously control the system from both said central processing unit and said central panel unit by establishing priority of computer addresses and commands over addresses and commands manually entered from said central panel unit, said priority means being further operable when said mode selection means is in the manual mode to fully inhibit control from said central processing unit and when said mode selection means is in the computer only mode to fully inhibit control by an operator from said central panel unit;

at least one remote panel unit, said remote panel unit having an associated plurality of addressable sensor input/output cards, said remote panel unit and each of said addressable sensor input/output cards having address decode circuits and data transmission circuits for use in conjunction with individual sensor devices interconnected with card sensor input/output cards, and said remote panel unit having address signal selection means for pre-establishing individual unique addresses for said remote panel unit and the sensor input/output cards associated with said remote panel unit;

an address bus, said address bus being interconnected with said central processing unit, said central panel unit and said at least one remote panel unit and its said associated input/output cards and said interconnected sensor devices for transmission of address signals;

a data bus, said data bus being interconnected with said central processing unit and said remote panel unit for transmission of data signals; and

sequencing means in said system, said sequencing means providing a sequence of operations when said central panel mode selection switch is in any position consisting of (A) generating address signals for activation of said first indication means and transmission over said address bus for selection of an individual remote panel unit and an individual sensor device associated with said individual remote panel unit, and (B) transmitting data signals over said data bus from the sensor device selected through its associated remote panel unit to a central panel unit for analysis by an operator.

9. A sensor based system comprising:

a central processing unit, said central processing unit having program facilities, storage facilities and sensor interface facilities and said central processing unit further having address signal generating and command signal generating facilities as well as data signal analysis facilities;

a central panel unit, said central panel unit and said central processing unit being operable to control said system on a mutually exclusive and independent basis, said central panel unit having manual address signal generating means, manual command signal generating means, mode selection means for selecting (1) a manual mode wherein said system is controlled solely from said central panel unit, (2) a manual/computer mode wherein said system is controlled both manually from said central panel unit or automatically by said central processing unit but on a mutually exclusive basis and (3) a computer only mode wherein said system is controlled solely by said central processing unit, and said central panel unit further having first indication means for indicating addresses manually selected and second indication means for manifesting sensor status (data) indications;

system priority means operable when said mode selection means is in the manual/computer mode to enable control either by an operator from said central panel unit or by said central processing unit, but not both concurrently and said priority means having facilities for resolving attempts to simultaneously control the system from both said central processing unit and said central panel unit by establishing priority of computer addresses and commands over addresses and commands manually entered from said central panel unit, said priority means being further operable when said mode selection means is in the manual mode to fully inhibit control from said central processing unit and when said mode selection means is in the computer only mode to fully inhibit control by an operator from said central panel unit;

at least one remote panel unit, said remote panel unit having an associated plurality of addressable sensor input/output cards, said remote panel unit and each of said addressable sensor input/output cards having address decode circuits, command decode circuits, and data transmission circuits for use in conjunction with individual sensor devices interconnected with said sensor input/output cards, and said remote panel unit having address signal selection means for pre-establishing individual unique addresses for said remote panel unit and the sensor input/output cards associated with said remote panel unit;

individual card command means in each of said sensor input/output cards for generating commands for control purposes;

individual card indicator means in each of said sensor input/output cards for indicating sensor device status;

an address bus, said address bus being interconnected with said central processing unit, said central panel unit and said at least one remote panel unit and its said associated input/output cards and said interconnected sensor devices for transmission of address signals;

a command bus, said command bus being interconnected with said central processing unit, said central panel unit and said at least one remote panel unit for transmission of command signals; and

a data bus, said data bus being interconnected with said central processing unit, said central panel unit and said remote panel unit for transmission of data signals.