JP4489420B2 - Control device and data transfer method in control device - Google Patents

Description

  The present invention relates to a control device that transfers data between a setting display unit having a display unit and an operation setting unit, and a control unit, and a data transfer method in the control device.

  For example, in food showcases, etc., temperature control in the cabinet and control of defrosting, defrosting, alarm notification, etc. are performed, for example, a control unit etc. is arranged in the machine room provided at the bottom of the case and the showcase part A setting display section is provided. In such a system, it is necessary to transfer display data and data such as various switch states between the control unit and the setting display unit.

  An outline of the showcase is shown in FIG. The showcase includes a showcase control main body 90, a load 96, a temperature detection unit 97, and a setting display unit 98. The showcase control main body 90 includes a microcomputer 91, a power supply circuit 92, a power switch 93 for turning on / off the showcase, a load driving circuit 94, and an input / output circuit 95.

  The microcomputer 91 has a built-in timer and A / D converter, and controls load on / off, temperature display, etc. according to the detected temperature of the thermistor and various set values, and controls the operation of the entire showcase.

  The power supply circuit 92 is a circuit that receives commercial power and supplies power to a load such as a compressor or a fan, and converts the voltage into 12 V or 5 V DC and outputs the same.

  The power switch 93 is a switch for turning on / off the power of the entire showcase.

  The load drive circuit 94 is a circuit that drives a load such as a compressor or a fan. The load drive circuit 94 includes a compressor drive circuit 941, a fan drive circuit 942, a defrost heater drive circuit 943, a windshield heater drive circuit 944, a windshield fan drive circuit 945, a rear glass heater 946, and an illumination drive circuit 947.

  The input / output circuit 95 is a circuit that inputs / outputs a high voltage alarm input / output signal, a temperature detection signal, display data, and the like to the microcomputer 91. The input / output circuit 95 includes a high voltage alarm input circuit 951 and a high voltage alarm output circuit 952 for inputting and outputting a high voltage alarm signal, an internal thermistor input circuit 953 and an evaporator thermistor input circuit 954 for inputting the internal temperature and the evaporator temperature, A display output circuit 955 for outputting the temperature of the display, a display output circuit 956 for outputting the operation state, and a switch input circuit 957 for inputting the state of the switch.

  The load 96 includes a refrigeration cycle compressor 961, a blower fan 962, a defrost heater 963 that is a heater for defrosting, a front glass heater 964 that is a windshield anti-fog and a front glass fan 965, and a rear glass heater that is a rear glass fogger. 966, and a lighting 967 in the showcase cabinet.

  The temperature detection unit 97 is a circuit that detects the internal temperature of the storage, and includes an internal thermistor 971 that detects the internal temperature and an evaporator thermistor 972 that detects the temperature of the evaporator.

  The setting display unit 98 is a means for displaying the temperature in the cabinet, for example, a temperature display unit 981 configured by a 7-segment numerical display unit, a monitor display unit 982 for displaying an operation state or the like by lighting the LEDs, And a switch unit 983 for setting the operation state.

  In such a data transfer system, for example, the setting display unit 98 includes two 7-segment numerical value display means and four monitor LEDs, and exchanges various data with the control unit. Is done. The numerical value display means provided in the setting display unit 98 is a means for displaying the internal temperature and the set temperature. The four monitor LEDs are means for indicating the minus of the fogging operation state, the defrosting operation state, the cooling operation state, and the temperature of the windshield in the warehouse.

  For simple transfer of data between the setting display unit having such a function and the control unit, a signal line for numerical display means and a signal line for monitor LED are required. When the data transfer of these means is performed by the dynamic drive system that divides the monitor LED lighting period and the two numerical value display means display periods, they are connected by at least 10 signal lines (for example, Patent Document 1). See the prior art).

On the other hand, in such a refrigeration / refrigeration system, it is required to provide various switches or the like in the showcase unit and transfer the setting state of the switches to the control unit. For example, it is necessary to transfer data indicating the states of six switches provided in the showcase section from the setting display section 98 to the input / output circuit 95, and to transfer the display data from the input / output circuit 95 to the setting display section 98. It becomes. By the way, in the showcase, the signal line connecting the control unit and the setting display unit is usually routed away from the food display unit because it does not impair the aesthetic appearance. If this signal line becomes thick, there is a problem that wiring work becomes difficult or space cannot be used effectively. In such a refrigeration / refrigeration apparatus such as a showcase, in order to transfer the data of the status of the six switches, it is necessary to add six new signal lines, which makes wiring difficult because the wiring becomes thicker. And it is not preferable because the space cannot be used effectively.
Japanese Patent No. 3156898

  In view of the above-described conventional problems, the present invention significantly increases signal lines in a freezer / refrigerator such as a showcase that employs a dynamic drive between a setting display unit and a control unit to transfer data. It is an object of the present invention to provide a control device capable of transmitting a status signal such as a switch provided in a setting display unit without increasing, and a data transfer method in the control device.

  Another object of the present invention is to provide a control device that can accurately detect a status signal of a switch or the like without being affected by external noise, and a data transfer method in the control device.

  In order to solve the above problems, the present invention provides a control device for controlling a load and a setting display unit, and a control device in which a setting display unit having a display unit and an operation setting unit is connected by a signal line and a power line. The control unit controls the operation of the display means and detects a setting state of the operation setting means, a display switching means for connecting the display means to a power source, and connecting the operation setting means to a power source A switching unit for detection; a setting state detecting unit for detecting a setting state of the operation setting unit; and a plurality of signal lines respectively connected to the control unit via resistors, and the setting display unit includes a plurality of setting display units. A display means comprising a plurality of display elements, an operation setting means comprising a plurality of operation setting elements and a plurality of backflow preventing means connected in series to the operation setting elements, respectively, And a signal line connected to each of the operation setting elements, and the control means arbitrarily selects the display element when the display switching means is selected and the display means is connected to a power source. When the detection switching means is selected and the operation setting means is connected to a power source, the operation setting elements are sequentially selected to detect the setting state.

  According to the present invention, in the control device, the operation setting unit connects one terminal of a plurality of operation setting elements to the control unit independently via the backflow prevention unit and the signal line, and the other terminal Commonly connected to the output of the switching means for detection via the power line. Further, according to the present invention, in the control device, the display unit connects one terminal of a plurality of display elements to the control unit independently via the signal line, and shares the other terminal with the power line. And connected to the switching means for display. Furthermore, according to the present invention, in the control device, a plurality of display elements of the display unit and a plurality of operation setting elements of the operation setting unit are connected to the control unit via a plurality of common signal lines.

  According to the present invention, in the above control device, the setting state detection unit includes a control electrode and two terminals, and the first resistance connected to the output of the detection switching unit and the operation setting And a common terminal of the means connected via a second resistor, the first terminal connected to the power source, the second terminal grounded via the resistor, the second terminal and the resistor Were connected to the control means.

  The present invention provides the control device, wherein the display switching means, the detection switching means, and the setting state detection means are transistors, the display means is a 7-segment numerical display means, the operation setting element is a switch, The control means is a microcomputer. Further, according to the present invention, in the control device, the control means sequentially selects and operates the display switching means and the detection switching means, and selects and changes the state of the signal line, thereby detecting the switching means. When the is operating, the signal line is selected to detect the state of one of the operation setting elements. Further, when the control means detects the setting state of the operation setting element, the control unit detects the setting state of the same operation setting element a plurality of times, and the more detected setting state is the setting state of the operation setting element. I tried to do it.

  The present invention is a data transfer method in the control device, wherein the display of the display means and the detection of the setting state of the operation setting means are operated by a dynamic drive system. The present invention further detects the setting state of the plurality of operation setting elements when detecting the setting state of the operation setting means by a dynamic drive method, and detects the setting state of the plurality of operation setting elements by a dynamic drive method. Sometimes, a state is detected a plurality of times for one operation setting element, and the number of detected states is compared, and the larger one is determined as the state of the operation setting element.

  The present invention is a display comprising a control unit for controlling a load and a setting display unit, and a plurality of display elements in which one terminal is independently connected to the control unit and the other terminal is commonly connected to the control unit. And a setting display unit having a plurality of operation setting elements each having one terminal connected to the control unit independently and the other terminal connected to the control unit in common. In the control device connected by a line and a power line, the control unit controls the operation of the display means and detects the setting state of the operation setting means, and the commonly connected terminal of the display means via the power line Connected display switching means, detection switching means connected to a commonly connected terminal of the operation setting means via a first resistor and a power line, and the detection switching means A control electrode is connected via a second resistor between the first resistor connected to the output of the output terminal and the commonly connected terminal of the operation setting means, and one terminal is a power source and the other terminal is a resistor. A setting state detection means in which the connection point between the other terminal and the resistor is connected to the control means, and one end is connected to a port of the control means via a resistor and the other end is the display A plurality of signal lines connected to the setting unit, wherein the setting display unit is connected to each of the operation setting elements in series, a backflow prevention unit, and one terminal of each display element of the display unit A plurality of signal lines connected to each of the operation setting elements of the operation setting means, a common terminal of the display means, and a power line connected to the common terminal of the operation setting means, and the control means But for display The switching unit for detection and the switching unit for detection are sequentially selected and operated, and the state of the signal line is selected and changed, and when the switching unit for detection is operating, the signal line is selected to set any operation. The state of the element was detected.

  By having the above-described configuration, the present invention can provide monitor LED lighting data, numerical display data, and switch state data between the setting display unit and the control unit in a control device such as a showcase having a freezing / refrigeration function. The signal lines can be transferred without significantly increasing.

  Furthermore, the present invention can accurately detect data such as a switch state without being affected by external noise.

  Hereinafter, a control device according to the present invention and a data transfer method in the control device will be described with reference to the drawings. FIG. 1 is a diagram for explaining a configuration when the control device according to the present invention is applied to a freezer / refrigerator such as a showcase, and FIG. 2 is a time chart for explaining a display and switch detection algorithm by a dynamic drive method. . FIG. 3 is a time chart for explaining a switch state detection method in the switch state detection period, and FIG. 4 is a flowchart thereof.

  The control device according to the present invention is configured by connecting a control unit 1 and a setting display unit 3 by a signal cable 5.

  The control unit 1 includes a main body side microcomputer (control means) 11, a first amplifier 12, a second amplifier 13, four transistors (switching means) 14-1 to 14-4, and one transistor. (Setting state detection means) 14-5, resistors 15-1 to 15-11, resistors 16-1 to 16-4, capacitors 17-1 to 17-3, and signal lines 18-1 to 18-7 And power lines 18P-8 to 18P-11 and a connector 19.

  The setting display unit 3 is a first numerical value display means 31-1, a second numerical value display means 31-2, four monitor LEDs 32-1 to 32-4, and operation setting elements, which are display means. Six switches 33-1 to 33-6, six backflow blocking diodes 34-1 to 34-6, signal lines 38-1 to 38-7, power lines 38P-8 to 38P-11, connectors 39.

  The signal cable 5 is configured by associating and connecting the first connector 52 and the second connector 53 with seven signal lines and four power lines 51-1 to 51-11.

  The microcomputer 11 of the control unit 1 sets the outputs P to S and a to g of the first amplifier 12 and the second amplifier 13 to “high” or “low” according to the software that the controller 11 has, and the setting display unit 3 is dynamically driven. It has a function of controlling by the system and a function of detecting and judging the switch state of the setting display unit 3 based on an algorithm unique to the present invention.

  The first amplifier 12 is means for amplifying the output signal of the microcomputer 11 that drives the first transistor 14-1 to the fourth transistor 14-4 connected to the outputs P to S. The second amplifier 13 is an amplifying means for amplifying seven inputs from the microcomputer 11 and outputting them to the signal lines 18-1 to 18-7 via the outputs a to g and the resistors 15-1 to 15-7. is there.

  The first transistor 14-1 is turned on when the output Q of the first amplifier 12 becomes “low”, and the monitor LEDs 32-1 to 32-32 of the setting display unit 3 through the power lines 18 P-10 and 38 P-10. 4 serves as a power switch for supplying power to the power source 4.

  The second transistor 14-2 is turned on when the output R of the first amplifier 12 becomes "low", and displays the first place of the setting display unit 3 via the power lines 18P-9 and 38P-9. It functions as a power switch for supplying power to the first numerical value display means 31-1. The third transistor 14-3 is turned on when the output S of the first amplifier 12 becomes "low", and displays the tenth place of the setting display unit 3 through the power lines 18P-8 and 38P-8. 2 serves as a power switch for supplying power to the numerical display means 31-2.

  The fourth transistor 14-4 is turned on when the output P of the first amplifier 12 becomes "low", and switches 33-1 to 33-33 of the setting display unit 3 through the power lines 18P-11 and 38P-11. 6 functions as a power switch for supplying power to the power source 6.

  The fifth transistor 14-5 functions as a switch state detection unit that detects the state of any one switch and sends it to the microcomputer 11 when the fourth transistor energizes the switches 33-1 to 33-6. The base of the fifth transistor 14-5 is connected to the connector 19 via a filter comprising a resistor 16-2 and a capacitor 17-1, the collector is grounded via a resistor 16-3, and the capacitor 17-2, resistor It is connected to port I of the microcomputer through a filter comprising 16-4 and capacitor 17-3.

  The signal lines 18-1 to 18-7 connect the outputs a to g of the second amplifier 13 and the connector 19, and connect the output of the second amplifier 13 to the first amplifier via the connector 19 and the signal cable 5. It has a function of connecting to the numerical value display means 31-1, the second numerical value display means 31-2, the monitor LEDs 33-1 to 33-4, and the switches 33-1 to 33-6. Resistors 15-1 to 15-7 are connected to the signal lines 18-1 to 18-7, respectively.

  The power line 18P-8 is connected to the collector of the third transistor 14-3 whose base is connected to the output S of the first amplifier 12, and the power supply + V12 is connected to the second numerical value display means 31-2 of the setting display unit 3. Connect. The power line 18P-9 is connected to the collector of the second transistor 14-2 whose base is connected to the output R of the first amplifier 12. The power line 18P-9 is connected to the first numerical value display means 31-1 of the setting display unit 3 by the power source + V12. Connect. The power line 18P-10 is connected to the collector of the first transistor 14-1 whose base is connected to the output Q of the first amplifier 12, and the power supply + V12 is supplied to the monitor LEDs 32-1 to 32-4 of the setting display unit 3. Connecting. The power line 18P-11 has one end connected to the collector of the fourth transistor 14-4 whose base is connected to the port P of the first amplifier 12, and the other end connected to the connector 19 via the resistor 16-1. The power source + V5 is connected to the switches 33-1 to 33-6 of the setting display unit 3.

  The connector 19 is a connector for connecting the control unit 1 to the setting display unit 3 via the signal cable 5.

  The first numerical value display means 31-1 of the setting display unit 3 is configured as a seven-segment numerical value display means using, for example, an LED, and displays a numerical value of one place. The second numerical value display means 31-2 is configured as a 7-segment numerical value display means using, for example, an LED, and displays a numerical value at the tenth place.

  The monitor LEDs 32-1 to 32-4 are display means for displaying operation states such as a cooling operation state, a minus temperature display state, a showcase defrosting operation state, and a showcase glass defrosting operation state.

  Switches 33-1 to 33-6 are a switch for setting cloudy fog removal on / off, a switch for setting defrosting on / off, a switch for releasing alarm, a setting switch for setting temperature, etc., and a lighting on / off setting A switch for setting ON / OFF of operation.

  The backflow prevention diodes 34-1 to 34-6 are diodes that prevent backflow of the output from the second amplifier 13 when the fourth transistor 14-4 is off.

  The signal lines 38-1 to 38-7 are connected to the segments of the first numerical value display means 31-1 and the second numerical value display means 31-2, and the signal lines 38-2 to 38-7 are connected to prevent reverse flow. The diodes 34-1 to 34-6 are connected to the switches 33-1 to 33-6 via the diodes 34-1 to 34-6. Further, the signal lines 38-4 to 38-7 are connected to the cathodes of the monitor LEDs 32-1 to 32-4. The power line 38P-8 is connected to the common terminal of the second numerical value display means 31-2, the power line 38P-9 is connected to the common terminal of the first numerical value display means 31-1, and the power line 38P-10 is connected to each monitor LED 32-1. To 32-4, and the power line 38P-11 is connected to the common connection side of the switches 33-1 to 33-6.

  The connector 39 is a connector for connecting the setting display unit 3 to the control unit 1 via the signal cable 5.

  The operation of the signal transfer apparatus having such a configuration will be described. As shown in FIG. 2, the microcomputer 11 provided in the control unit 1 has a monitor LED lighting period, a second numerical value display means lighting period, a first numerical value display means lighting period, and a switch state detection period every 2 milliseconds. And switch modes.

  That is, in the monitor LED lighting period, the first transistor 14-1 is turned on, the required outputs a to d of the second amplifier 13 are set to “low”, and the required monitor LEDs 32-1 to 32-2. 4 is selected and lit. During the second numerical value display means lighting period, the third transistor 14-3 is turned on to supply power to the common terminal of the second numerical value display means 31-2, which is necessary for the second amplifier 13. The outputs a to g are set to “low”, and the segments are selectively lit to display numbers. Similarly, in the first numerical value display means lighting period, the second transistor 14-2 is turned on to supply power to the common terminal of the first numerical value display means 31-1, and the second amplifier 13 is required. The outputs a to g are set to “low”, and the segments of the numerical display means are selectively lit to display numbers. In the switch state detection period, the fourth transistor 14-4 is turned on to supply power to the common terminals of the switches 33-1 to 33-6, and the outputs a to f required by the second amplifier 13 are supplied. For example, the state of each switch is sequentially detected by sequentially setting “low” for 330 μsec.

  In this way, using the seven signal lines and the four power lines, displaying numbers on the two seven-segment numerical display means, controlling the lighting of the four monitor LEDs, and six It is possible to detect the state of the switch.

  In the above method, if noise is generated due to on / off of a compressor motor, a switching transistor, or the like in the refrigeration cycle during the switch state detection period, the switch state may be erroneously detected. In order to cope with this problem and accurately detect the switch state, the present invention uses the following method.

  As shown in FIG. 3, in the detection period (330 μs) corresponding to each switch in the switch state detection period, the microcomputer 11 performs switch state detection a plurality of times (for example, odd number of times) (for example, 13 times in FIG. 3). The switch state is judged by comparing the number of times ("high" or "low") of the state ("high" or "low") and adopting the larger one. Since the state of the switch is determined based on such a magnitude determination, an accurate switch state can be detected even if there is noise in the required switch state detection period.

  The processing of the microcomputer 11 that detects the switch state without being affected by noise in the dynamic drive system described above will be described with reference to FIG. This process is executed by a timer interrupt every 2 msec. By rewriting the timer value in the process from step S41 to step S48 or step S49, the process from step S41 to step S91 is executed every 330 μsec. The When the process of step S91 is completed and step S11 is executed again, the timer value is rewritten to 20 milliseconds again to prepare for the next interrupt. In order to determine the processing period, the microcomputer 11 is provided with a counter. This counter is reset to “0” when the microcomputer 11 is initialized.

  When the process starts, it is determined whether or not the content of the counter is “0”, and it is determined whether or not it is the monitor LED lighting period (S1). When the counter is “0” and the monitor LED is on, the monitor LED display program is executed, 1 is added to the counter, and the counter is set to “1” (S11). If it is not the monitor LED lighting period in step S1, it is determined whether or not the content of the counter is “1”, and it is determined whether or not it is the second numerical value (10th) display means lighting period (S2). ). When the counter is “1” and the second numerical value (10th) display means lighting period, the second numerical value display program is executed to add 1 to the counter and set the counter to “2” (S21). If it is not the second numerical value display means lighting period in step S2, it is determined whether or not the content of the counter is "2" to determine whether it is the first numerical value display means lighting period (S3). ). When the counter is "2" and the first numerical value display means lighting period is in effect, the first numerical value display means lighting program is executed to add 1 to the counter and set the counter to "3" (S31). If it is not the first numerical value display means lighting period in step S3, the process proceeds to the switch detection period, and the switch state is detected.

  First, it is determined whether or not the content of the counter is “3”, and it is determined whether or not the switch state detection period is the switch A (33-1) (S4). When the counter is “3” and the switch state detection period is switch A, the process proceeds to the switch A state detection program.

  In the switch A state detection program, the fourth transistor 14-4 is turned on for 2 m seconds, for example, and the power supply + V5 is applied to the switches 33-1 to 33-6 (S41). Next, the output a of the second amplifier 13 is set to “low” for 330 μsec, and the other outputs b to f are set to “high” (S42). Thereafter, the microcomputer 11 determines whether its own port I is “high” or “low” (S43). That is, when the port a of the second amplifier 13 is “low” and the switch 33-1 is “off”, the base of the fifth transistor 14-5 is “high”, so that the fifth transistor 14-5 is “off”, and “low” is input to the port I of the microcomputer 11. When the port a of the second amplifier 13 is “low” and the switch 33-1 is “on”, the base of the fifth transistor 14-5 is “low”, so that the fifth transistor 14− 5 is turned “ON”, and the voltage “HIGH” of the power source + V5 is inputted to the port I of the microcomputer 11. After determining whether the port I is “high” or “low”, the microcomputer 11 advances the high counter or the low counter, respectively (S44 or S45).

  Next, it is determined whether or not the input state of the port I of the microcomputer 11 has been determined for a predetermined number of times, for example, 13 times in 330 μs (S46), and when the predetermined number of times has not been determined, Returning to the determination in step S43, the processing in steps S44 and 45 and the determination in step S46 are performed. When the predetermined number of determinations are made, the contents of the high counter and the contents of the low counter are compared (S47). When the contents of the high counter are large, the input of the port I is “high”, that is, the switch 33. It is determined that −1 is “ON” (S48). When the content of the low counter is large in the comparison in step S47, it is determined that the input of the port I is “low”, that is, the switch 33-1 is “off” (S49). Thereafter, 1 is added to the counter and the determination process is terminated.

  If it is determined in step S4 that the switch state detection period is not determined by the switch A (33-1), the contents of the counter are determined to determine whether or not the switches B to F (33-2 to 33-6) are sequentially detected. (S5-9) and the corresponding switch detection program is executed (S51-S91). Since the switch detection program is the same as the switch A detection program, detailed description thereof will be omitted. When the detection program for the switches B to E ends, 1 is added to each counter. When the switch F detection program ends, the counter is set to “0” and the process ends.

  As described above, according to the present invention adopting the dynamic drive system, while 11 communication lines are used, two 7-segment numerical value display means and four status display LEDs are lit and displayed. It becomes possible to detect the setting state of each switch.

  Further, in the switch state detection period, an accurate switch state can be detected without being affected by noise even if noise occurs.

  In the above description, the first amplifier 12 and the second amplifier 13 that amplify the signal are provided to drive the numerical value display means 31 and the monitor LED 32 of the display unit 3. These amplifiers can be omitted.

  First to fourth pnp transistors 14-1 to 14-4 as means for supplying power to the monitor LEDs 32-1 to 32-4, numerical display units 31-1 and 31-2, and switches 33-1 to 33-6 However, other switching means may be used regardless of the pnp transistor.

The figure explaining the structure at the time of applying the control apparatus concerning this invention to freezing and refrigeration apparatuses, such as a showcase. The time chart explaining the display and switch detection algorithm by a dynamic drive system. The time chart explaining the switch state detection method in a switch state detection period. The flowchart of the switch state detection method in a switch state detection period. The block diagram explaining the outline | summary of the control part of a showcase.

Explanation of symbols

1: control unit 11: microcomputer 12: first amplifier 13: second amplifier 14: transistor 15, 16: resistor 17: capacitor 18: signal line 18P: power line 19: connector 3: setting display unit 31: 7 segment numerical value Display means 32: Status display LED
33: Switch 34: Backflow prevention diode 38: Signal line 38P: Power line 39: Connector 5: Signal cable 51: Signal line 52, 53: Connector

Claims (12)

In a control device in which a control unit that controls a load and a setting display unit, and a setting display unit having a display unit and an operation setting unit are connected by a signal line and a power line,
The control unit is
Control means for controlling the operation of the display means and detecting the setting state of the action setting means;
Display switching means for connecting the display means to a power source;
Switching means for detection for connecting the operation setting means to a power source;
Setting state detecting means for detecting a setting state of the operation setting means;
A plurality of signal lines respectively connected to the control means via resistors,
The setting display section
Display means comprising a plurality of display elements;
An operation setting means comprising a plurality of operation setting elements and a plurality of backflow prevention means connected in series to the operation setting elements,
Each of the display elements and a signal line connected to the respective operation setting element,
The control means selects the display element when the display switching means is selected and the display means is connected to a power source, displays the display element, selects the detection switching means, and selects the operation setting means. A control device that detects a setting state by sequentially selecting the operation setting elements when connected to a power source.   In the operation setting means, one terminal of a plurality of operation setting elements is independently connected to the control unit via the backflow prevention means and the signal line, and the other terminal is commonly connected to the control line via the power line. The control device according to claim 1, wherein the control device is connected to an output of the switching means for detection.   In the display means, one terminal of a plurality of display elements is independently connected to the control unit via the signal line, and the other terminal is commonly connected to the output of the display switching means via the power line. The control device according to claim 1, wherein:   The plurality of display elements of the display unit and the plurality of operation setting elements of the operation setting unit are connected to the control unit via a plurality of common signal lines. The control device described.   The setting state detection means has a control electrode and two terminals, and the control electrode has a first resistor connected to the output of the detection switching means and a commonly connected terminal of the operation setting means. The first terminal is connected to the power source and the second terminal is grounded via the resistor, and the connection point between the second terminal and the resistor is connected to the control means. The control device according to any one of claims 1 to 4, wherein the control device is provided.   The display switching means, the detection switching means, and the setting state detection means are transistors, the display means is a 7-segment numerical display means, the operation setting element is a switch, and the control means is a microcomputer. The control device according to claim 1, wherein the control device is a control device.   The control means sequentially selects and operates the display switching means and the detection switching means and selects and changes the state of the signal line, and the signal line when the detection switching means is operating. 7. The control device according to claim 1, wherein the state of any one of the operation setting elements is detected by selecting.   8. The control according to claim 7, wherein the control unit detects the setting state of the same operation setting element a plurality of times, and sets the detected setting state to the setting state of the operation setting element. apparatus. A data transfer method in a control device according to any one of claims 1 to 8,
A data transfer method for a control apparatus, wherein display of the display means and detection of a setting state of the operation setting means are operated by a dynamic drive system.   10. The data transfer method of the control device according to claim 9, wherein detection of setting states of the plurality of operation setting elements when detecting a setting state of the operation setting means is performed by a dynamic drive method.   When detecting the setting state of the plurality of operation setting elements by the dynamic drive method, the state is detected a plurality of times for one operation setting element, and the number of detected states is compared to determine the state of the operation setting element. The data transfer method of the control device according to claim 10, wherein: A control unit that controls the load and the setting display unit, a display unit including a plurality of display elements in which one terminal is independently connected to the control unit and the other terminal is commonly connected to the control unit; A signal line and a power line are connected between a setting display unit having an operation setting unit composed of a plurality of operation setting elements each having a terminal independently connected to the control unit and the other terminal commonly connected to the control unit. In the connected control unit,
The control unit is
Control means for controlling the operation of the display means and detecting the setting state of the action setting means;
Switching means for display connected to a commonly connected terminal of the display means via a power line;
Switching means for detection connected to a commonly connected terminal of the operation setting means via a first resistor and a power line;
A control electrode is connected via a second resistor between the first resistor connected to the output of the detection switching means and the commonly connected terminal of the operation setting means, and one terminal is connected to the power supply. A setting state detecting means in which the terminal of the other is grounded via a resistor and the connection point between the other terminal and the resistor is connected to the control means;
A plurality of signal lines each having one end connected to a port of the control means via a resistor and the other end connected to the display setting unit;
The setting display section
Backflow prevention means connected in series to each of the operation setting elements;
A plurality of signal lines connected to one terminal of each display element of the display means and each operation setting element of the operation setting means;
A power line connected to the common terminal of the display means and the common terminal of the operation setting means,
The control means sequentially selects and operates the display switching means and the detection switching means, selects and changes the state of the signal line, and selects the signal line when the detection switching means is operating. And detecting a state of any one of the operation setting elements.

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