Computer directed process control system with analog input multiplexer
阅读：198发布：2023-09-24
专利汇可以提供Computer directed process control system with analog input multiplexer专利检索，专利查询，专利分析的服务。并且An industrial process control system including a digital computer arranged in a time-share configuration to perform calculations respecting a plurality of process conditions, and to produce corresponding command signals for respective process operators such as valves and the like. The system includes an analog multiplexer comprising a plurality of individual printed circuit switch cards each carrying a number of switch circuits adapted to be connected to corresponding analog measurement points. The computer sends to a multiplexing control unit, instructions identifying a specific analog point to be sampled, or identifying a sequential group of points to be sampled. The control unit operates in cooperation with circuitry on the switch cards to carry out procedures incident to sampling the identified analog points, converting the signal to digital format, and signalling the processor that the data is ready for transfer. The system is arranged to permit different types of switch cards, such as relay and solid-state switches, to be intermixed as desired, or changed in the field, without requiring accommodating changes in hardware or in computer software.，下面是Computer directed process control system with analog input multiplexer专利的具体信息内容。
1. In an industrial process instrumentation system for use with complex processes having a number of variable conditions, the system including a central processor organized in a time-share configuration to perform computations respecting the values of the process conditions so as to produce signals for use in operating the process, said system further comprising an analog multiplexing input section to receive a plurality of analog signal lines each carrying an analog signal corresponding to the value of a respective process condition; the improvement in such multiplexing input section which comprises; a plurality of individual circuit cards each carrying at least one switching circuit to which an analog signal line is to be connected; control circuit means responsive to signals from said central processor for directing to said circuit cards select signals identifying the specific switching circuit to be activated; said circuit cards including acknowledge circuit means responsive to said select signals and operable at the selected card to transmit back to said control circuit means an acknowledge signal indicating that the selected circuit card is available for operation.
2. A system as claimed in claim 1, wherein said circuit cards comprise a first group containing switching circuits of a first type suited for use with a particular class of analog signals, and a second group containing switching circuits of a second type suited for use with analog signals of another class, said acknowledge circuit means including means to produce an acknowledge signal indicating whether the selected card is from said first or said second group.
3. A system as claimed in claim 2, wherein said first and second switching circuit types are relay and solid-state switching circuits, respectively.
4. A system as claimed in claim 2, wherein the switching circuits on at least a portion of said cards comprise a point switch serially connected with an output switch; the output switches of all cards having identical electrical characteristics.
5. A system as claimed in claim 4, wherein said first and second switching circuit types are relay and solid state, respectively; said output switches of both groups of cards being of solid-state type.
6. A system as claimed in claim 1, wherein said control circuit means includes activating means responsive to said acknowledge signal for effecting further control procedures respecting the read-out of data from the selected circuit card.
7. A system as cLaimed in claim 6, including an analog-to-digital converter; said activating means including means to activate said analog-to-digital converter to convert the analog signal from the selected card to a corresponding digital signal for transfer to the central processor.
8. A system as claimed in claim 7, wherein said activating means includes timing means to delay activation of said converter for a period of time sufficient to assure proper closure of the selected switching circuit.
9. A system as claimed in claim 6, wherein said activating means includes signaling means for sending a control signal back to the acknowledging card, to carry out further functions at said card.
10. A system as claimed in claim 9, wherein said signaling means produces a signal for controlling the closure of the selected switching circuit at the selected card.
11. A system as claimed in claim 6, wherein said circuit cards comprise first and second groups having relay and solid-state switching circuits, respectively; said acknowledge signal serving to indicate whether the selected card is a relay or solid-state type; said activating means including signaling means for directing to a selected relay card a control signal for energizing a relay on that card.
12. A system as claimed in claim 11, wherein each relay switching circuit comprises first and second serially-controlled relays; said select signals serving to energize said first relay; said control signal serving to energize said second relay.
13. A system as claimed in claim 12, wherein each relay card includes a group of said first relays, serving as point relays, said second relay being connected in common to the group of point relays.
14. A system as claimed in claim 12, wherein said signaling means includes time delay means to delay activation of said second relay a sufficient time to assure stable closure of said first relay.
15. In an industrial process instrumentation system for use with complex processes having a number of variable conditions, the system including a central processor organized in a time-share configuration to perform computations respecting the values of the process conditions so as to produce signals for use in operating the process, said system further comprising an analog multiplexing input section to receive a plurality of analog signal lines each carrying an analog signal corresponding to the value of a respective process condition; the improvement in such multiplexing input section which comprises; a plurality of individual circuit cards each carrying at least one switching circuit to which an analog signal line is to be connected; first control circuit means responsive to initiating signals from said central processor for directing to said circuit cards select signals identifying the specific switching circuit to be activated; an analog-to-digital converter; second circuit means for producing control signals operable after activation of the selected switching circuit to direct the corresponding analog signal through said converter to produce a digital signal for transfer back to said central processor; and third circuit means for signalling said central processor when a digital signal is available for transfer.
16. In an industrial process instrumentation system for use with complex processes having a number of variable conditions, the system including a central processor organized in a time-share configuration to perform computations respecting the values of the process conditions so as to produce signals for use in operating the process, said system further comprising an analog multiplexing input section to receive a plurality of analog signal lines each carrying an analog signal corresponding to the value of a respective process condition; the improvement in such multiplexing input section which comprises; a plurality of individual circuit cards each carrying at least one switching circuit to which an analog signal line Is to be connected; control circuit means responsive to an instruction signal from said central processor for directing to said circuit cards select signals identifying a specific switching circuit to be activated; said control circuit means including sequential means for producing a sequential series of select signals identifying a corresponding series of said switching circuits in predetermined order, whereby to effect read-out of a group of analog signals in response to a single instruction signal from said central processor.
17. A system as claimed in claim 16, including means responsive to the completion of read-out of each selected switching circuit for activating the select signal for the next switching circuit in the sequence.
18. A system as claimed in claim 17, wherein said circuit cards comprise a plurality of switching circuits each having a relay followed by a solid-state output switch; said control circuit means including means to activate concurrently all of the relays of the selected sequential group; said sequential means including means to activate in sequence the solid-state output switches of the selected group.
19. In an industrial process instrumentation system for use with complex processes having a number of variable conditions, the system including a central processor organized in a time-share configuration to perform computations respecting the values of the process conditions so as to produce signals for use in operating the process, said system further comprising an analog multiplexing input section to receive a plurality of analog signal lines each carrying an analog signal corresponding to the value of a respective process condition; the improvement in such multiplexing input section which comprises: a plurality of relay switches to which respective analog signal lines are connectible; a plurality of high-speed output switches for said relay switches respectively; control circuit means responsive to an instruction signal from said central processor for energizing a selected group of said relay switches concurrently; said control circuit means including readout means to activate in sequence the output switches for the energized relay switches, to read-out the analog signals rapidly for transfer to said central processor.
20. A system as claimed in claim 19, wherein said output switches are solid-state switches.
21. A system as claimed in claim 20, wherein said relay switches are mounted on printed circuit cards.
22. A system as claimed in claim 21, wherein said relay circuit cards include a plurality of individual relay switches each connectible to a corresponding analog measurement point.
23. A system as claimed in claim 22, wherein each relay circuit card includes one solid-state output switch common to the group of relay switches on that card.
24. A system as claimed in claim 23, wherein each relay circuit card includes decoding means responsive to a digital point-select signal for activating a selected relay switch.
25. A system as claimed in claim 24, wherein the instruction signal from the central processor identifies one point in each circuit card to be read-out; said control circuit means including means to energize concurrently the particular relay switches for that point in each relay circuit card; said read-out means serving to activate in sequence the solid-state output switches for the selected group of circuit cards.
26. A system as claimed in claim 19, wherein said control circuit means comprises an address register to store a signal identifying a particular switch circuit to be read-out; and means for incrementing said address register following each read-out operation, to identify the next switch circuit in the sequence.
27. In an industrial process instrumentation system for use with processes having a number of variable conditions, the system including a central processor organized in a time-sharing configuration to perforM computations respecting the values of process conditions and to produce signals responsive thereto; said system further comprising an analog multiplexing input section having a plurality of relatively slow relay-type switches each individually selectable to make connection to a corresponding analog measurement signal to be read-out; the method of operating such a system which comprises the steps of: operating said central processor to produce signals identifying a group of relay-type switches to be read-out in sequence; activating concurrently all of the relay-type switches identified by said processor signals; operating a series of high-speed, solid-state switches sequentially to make connection to the respective outputs of said activated relay-type switches; and converting each analog measurement signal developed by said solid-state switches to digital format in preparation for transfer to said central processor.
28. In an industrial process instrumentation system for use with complex processes having a number of variable conditions, the system including a central processor organized in a time-share configuration to perform computations respecting the values of the process conditions so as to produce signals for use in operating the process, said system further comprising an analog multiplexing input section to receive a plurality of analog signal lines each carrying an analog signal corresponding to the value of a respective process condition; the improvement in such multiplexing input section which comprises: a plurality of switching circuits each including a switch to which respective analog signal lines are con-nectible; an output line connected to the output of each of said switches to direct the corresponding analog signal to an analog-to-digital converter; means for selectively activating any of said switches; guard means coupled to said output line and operable to produce a guard voltage responsive to the average common-mode potential at said line; and circuit means for directing said guard voltage to input elements of said switching circuits associated with the non-activated switches.
29. A system as claimed in claim 28, wherein said switch circuit elements comprise the analog signal lines connected to the inputs of the non-activated switches.
30. A system as claimed in claim 29, including a data amplifier connected between said output line and said analog-to-digital converter; shield means for the input of said data amplifier; and means connecting said guard voltage to said shield means.
31. In an industrial process instrumentation system for use with complex processes having a number of variable conditions, the system including a central processor organized in a time-share configuration to perform computations respecting the values of the process conditions so as to produce signals for use in operating the process, said system further comprising an analog multiplexing input section to receive a plurality of analog signal lines each carrying an analog signal corresponding to the value of a respective process condition; the improvement in such multiplexing input section which comprises: a plurality of switching circuits each including a relay-type switch to which respective analog signal lines are connectible; an output line connected to the output of each of said switches to direct the corresponding analog signal to an analog-to-digital converter; each of said relay-type switches comprising a flying capacitor connectible to the analog signal line and switchable to the output line; means for selectively activating any of said switches to switch the corresponding capacitor to the output line and thereby direct to the analog-to-digital converter a signal corresponding to the charge on said capacitor developed by the analog signal connected to the activated switch; and circuit means operable after the signal from the capacitor has been directed to the analog-tO-digital converter, and including means for directing to the output line of an activated switch an electrical current for charging the corresponding flying capacitor, to provide an indication subsequently if the analog signal line connected to the switch has become open-circuited.
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