Supervisory and control system having dynamic significant change of values
First Claim
1. A signal transmission system comprising:
- transmitter means for selectively transmitting at predetermined time-slots a characterization value of a data signal responsive to a control stimulus;
adjustment means for providing a discriminant signal representing band limits, the value of the discriminant signal varying responsive to previous time-slot transmissions of said characterization value of said data signal; and
control means coupled to said transmitter means and said adjustment means, said control means comparing a current time-slot value of said characterization value of said data signal to the value of the previously transmitted characterization value of said data signal, including means for selectively outputting said control stimulus when the differential of the compared signals is greater than said discriminant signal.
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Abstract
Communications methods and apparatus are disclosed for multiple subsystem intercommunication for supervisory and control systems such as can be found in heating, air conditioning, energy control and other environmental control equipment that are installed in buildings and the like. The present invention provides an improved system which includes improved distribution means wherein data from individual distribution panels is discriminantly transmitted to the host computer as a function of the present sampled data and the data previously transmitted, preferably wherein the present rate of data transmission to the host computer is determined as a function of the previous rate of transmission.
The present invention provides distribution means wherein the characterization or definition of the specific function operations that are to be performed by individual control point apparatus can be carried out by instructions that are provided by an operator from a central or host computer.
A distribution means is provided whereby the present rate of data transmission from a remote unit to a host computer may be selectively determined as a function of the previous rate of transmission from that remote unit, and may also be determined as a function of the rate of communication (bandwidth) of communication to the host unit from the remote units. Means are provided for adapting change of value band limits which must be exceeded for transmission of an information signal (corresponding to the sampled data signal) to be output from a remote unit to the host unit. Additionally, means are provided for adjusting the change of value discriminant band limits as a function of the sampled data signal.
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Citations
49 Claims
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1. A signal transmission system comprising:
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transmitter means for selectively transmitting at predetermined time-slots a characterization value of a data signal responsive to a control stimulus; adjustment means for providing a discriminant signal representing band limits, the value of the discriminant signal varying responsive to previous time-slot transmissions of said characterization value of said data signal; and control means coupled to said transmitter means and said adjustment means, said control means comparing a current time-slot value of said characterization value of said data signal to the value of the previously transmitted characterization value of said data signal, including means for selectively outputting said control stimulus when the differential of the compared signals is greater than said discriminant signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A signal transmission system having a data signal to be sampled, comprising;
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means for sampling the data signal at time intervals and providing an information signal responsive to the sampled data signal means coupled to said sampling means for determining the differential value of a previously transmitted sampled data signal and the presently sampled data signal; means coupled to said differential value determining means for determining a fixed band limit signal variable for each sampling of data for each time interval responsive to the previous time interval differential value; and means coupled to said band limit signal value determining means and said differential value determining means for selectively transmitting said information signal responsive to the present time interval differential value exceeding the then existing band limit signal value. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A system having a data signal to be sampled comprising:
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means for sampling at time intevals the value of the data signal, means for determining a fixed discriminant value variable for each sampling time interval, responsive to successive time interval sampled values and a previous time interval transmitted information signal; means for selectively transmitting an information signal responsive to the present time interval data signal exceeding the discriminant value.
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31. A multi-processing system comprising:
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a plurality of remote processors, at least one remote processor comprising; means for time interval sampling a data signal; means for generating a fixed discriminant signal variable for each sampling time interval, responsive to the present time interval sampled data signal and an information signal from the most recent previous time interval transmission; means for selectively transmitting as the present time interval information signal a function of the present time interval sampled data signal responsive to said discriminant signal; and a host processor for receiving said information signal. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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39. A signal transmission system comprising a sending unit, said sending unit including;
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means for sampling a signal; means coupled to said sampling means for providing band limits for the sampled signal; means coupled to said band limit providing means for varying the size of the band limits responsive to a function of the signal being sampled; means coupled to said varying means for transmitting an information signal which is a function of the sampled signal value, responsive to the band limits and the sampled signal; and means coupled to said transmitting means for varying the transmission and sampling rates responsive to the signal being sampled. - View Dependent Claims (40)
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41. A heating, ventilation, and air conditioning system having a host unit and at least one remote unit, said remote unit comprising:
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sampling means for sampling data to a point remote to the host unit; limit means within said remote unit for determining fixed band limits variable for each sampling of data, responsive to said sampled data and a previously transmitted information signal; and transfer means for transmitting an information signal to the host unit responsive to the sampling means and limit means. - View Dependent Claims (42, 43, 44, 46)
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45. A process control system having a host unit and at least one remote unit, said remote unit comprising:
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sampling means for sampling data at a point remote to the host unit; limit means coupled to said sampling means for determining fixed band limits variable for each sampling of data, responsive to said sampled data and a previously transmitted information signal; and transfer means coupled to said sampling means and said limit means for transmitting an information signal to the host unit responsive to the sampled data exceeding the determined band limits. - View Dependent Claims (47, 48)
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49. A process control system having analog signal inputs comprising:
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means for providing a control signal at time intervals; means coupled to said control signal providing means for converting an analog signal into a digital signal responsive to said control signal; means coupled to said analog signal to digital signal converting means for converting said digital signal to an output signal, including means for selectively transmitting said output signal, responsive to a select signal; means coupled to said digital signal to output signal converting means for determining a discriminant value according to the relation BL =|Vb -VN |, where BL =discriminant band limit, Vb =value of a base discriminant value, and VN =value of new sample; means coupled to said determining means for providing an initial value of Vb and BL ; means coupled to determining means for outputting said select signal when Vb -BL ≦
VN and when Vb +BL ≦
VN ; andmeans coupled to said outputting means for adjusting the value of Vb such that Vb =VN when Vb -BL ≦
VN and when Vb +BL ≦
VN.
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Specification