Control device

Abstract: A control device with improved connection between display device and printed circuit board assembly, and improved key switches having beveled keytops. Further, the control device is configured to display the mode of internal manual switches without directly accessing the internal manual switches.

Description: This invention relates to a control device for controlling industrial electronic equipment. The control device can include, for example, a counter for counting the number of operating cycles or timer for measuring operating times, and is used to perform various control functions. More specifically, the present invention relates to a control device with means for displaying the internal manual switch mode on the display. In existing control devices it is difficult to adjust the mode of operation. Figure 8 shows an existing counter. As shown in Fig. 8, the face 101a of case 101 has a key panel 102 with keys for setting numerical values, and a display 104 and 105 for displaying present values and set values, respectively, consisting of seven-segment LEDs. Inside the case 101 is a built-in mode switch 107, which is covered by cover C. This mode switch 107 may consist of, for example, dipswitches 108 connected to a control circuit for input and output such as a one-chip microprocessor. The mode switch is used to switch among the various modes including input mode, output mode, maximum counting speed, one-shot output time, and so on. With this type of control device, the user cannot adjust the timing at which signals are received from or sent to other devices, nor can he set or change the value for the one-shot output time, which controls the operating time of the output actuator. Rather, the various initial values of the control device are set at the factory. This being the case, it is often necessary to set or change the auxiliary values. The existing devices have several schemes by which the user can change these settings. A first scheme is to provide a continuously variable control mounted on the device, a second scheme is to have dipswitches on the device, and a third scheme is to provide a mode key on the front of the case to switch among the setting modes for auxiliary values so that each value can be entered in its own mode. In existing control devices of the type described above, the user must confirm that the dipswitches or other switching devices have indeed been switched to the correct mode by removing a cover C, as shown in Fig. 1, and viewing the position of the switches through the opening in case 101. Generally, control devices A such as counters have their display assembly 101a and value setting device 102 on front panel 101a. Only the front panel 101a is exposed in the control panel B while the rest of the control device is located behind the control panel B making it difficult to access and expose from the front surface of the case. Thus, whenever the user desires to check the position of the dipswitches or settings on other electronic components (i.e. mode), the user must remove the control device from the control panel and then open the cover C of the control device to view the setting on the electronic component. If the aforesaid control device A is permanently mounted to control panel B, or if the aforesaid cover C of the control device is locked in place by means of mounting clip D, it is not possible to check the settings until after removing the control device A from control panel B. Thus, checking the settings by disassembling the control device is a laborious and time-consuming operation. In other existing devices, when a variable control is used to set and change auxiliary values such as the aforesaid one-shot output time, it is easy to fine-tune the settings. However, the accuracy of the values is poor, and are liable to change due to the influence of external factors such as temperature. When dipswitches are used, the user must select one from at most two to ten predetermined values, so more precise settings for the auxiliary values are not possible. When using a mode key on the front of the case, which tends to be used infrequently, is adopted, it raises the possibility of the switch being operated accidentally, or of the values being changed as a joke or prank. This could cause an entire system to malfunction. US-A-5 160 832 discloses a front panel unit for allowing user communication with electronic equipment. The present invention was developed in view of the problems discussed above. The present invention provides a control device for controlling electronic equipment with a display, comprising: a control circuit; a mode-switching assembly for switching among operation modes, the assembly including a number of internal manual switches connected to said control circuit; and a display assembly including a plurality of key switches electronically connected to said control circuit, wherein said control circuit can be actuated to display the ON/OFF mode of said internal manual switches. The present invention may also permit a control device to be provided on which the mode of manual internal switches can be checked regardless of whether the device is mounted on a control panel, and such that the checking operation requires little labor and is easy to perform. The present invention facilitates the prevention of values being set or changed accidentally or as a matter of a joke or prank while providing an arrangement that does not make it harder for the user to operate the device; and to make it possible to set or change auxiliary values such as the one-shot output time more easily and accurately. The present invention is also directed to a display device having a configuration to display the mode of internal manual switches. The control devices according to the present invention may include a display having a predetermined switch, and a mode-switching assembly which may consist of a number of dipswitches built into the interior of the device. When the predetermined switch is held down while the power supply is being connected, the ON or OFF state of each dipswitch may be shown on the display as long as the switch remains depressed. The control device may have on the front thereof a main value numeric display capable of displaying figures of several places, and a main input switch assembly consisting of a number of operating keys equal to the number of places in the main value display. This device is distinguished by the fact that when a specific predetermined key, which is one of the operating keys of the main input switch assembly, is held down while the power supply is being connected, the switch assembly shifts to its auxiliary setting mode and the current auxiliary values are displayed on the main numeric display, and it becomes possible to change the auxiliary values by operating the keys in the auxiliary mode. The auxiliary values of a one-shot output time for the device can be displayed. Further, the device may be configured so that the output time which has been set will be stored in the system memory if the power is cut off. The operator can operate the device to see what mode the dipswitches are set to by viewing the values displayed on the front of the case regardless of whether the control device is mounted on the control panel, and it is extremely simple to check these values. When a predetermined key, which is one of the several operating keys constituting the main input switch assembly, is held down while the power supply is being connected, the switch assembly shifts to its auxiliary setting mode, and the current auxiliary values are displayed on the main numeric display. Thus, there is no need for an additional set of switches to set or change the auxiliary values. The values are easily set or changed, and there is no mode key, so the user cannot accidentally change the values, nor can they be changed as a joke or prank. Since one set of operating keys on the front of the case is used to set both the main and the auxiliary values, the size of the keytops can be increased to make it easier for the user to operate the switches. Using the operating keys to change the auxiliary values allows greater accuracy and precision than do dipswitches or a continuously variable switch. In the drawings: Figure 1. Figure 1 is an oblique external view of a counter which is a preferred embodiment of the control device of the invention. Figure 2. Figure 2 is a frontal view of the same counter illustrating the normal counter operating mode. Figure 3. Figure 3 is a block diagram showing the configuration of the essential components of the same counter. Figure 4 . Figure 4 is a frontal view of the same counter illustrating the dipswitch display mode. Figure 5 . Figure 5 is a flowchart illustrating the procedure followed by the same counter when switching between modes. Figure 6 . Figure 6 is a frontal view of a timer which is another preferred embodiment of the control device of this invention, illustrating the mode for setting the one-shot output time. Figure 7. Figure 7 is a flowchart illustrating the procedure followed by the same timer when switching between modes. Figure 8. Figure 8 is an overhead view of an existing counter showing how it is mounted to its control panel. The following is a detailed description of a preferred embodiment of the control device according to the present invention with reference to the drawings. This particular control device is a counter, however, the present invention is directed to control devices in general and is not limited to a counter. The counter includes a front assembly 101a, a base , a front panel 103, upper and lower panels 104 and 105, and left and right panels defining the printed circuit board assembly, as shown in Figs. 1 and 2. The counter includes a key panel 102 for setting numerical values provided on the front 101a of case 101. The keys 103A through 103D, as shown in Fig. 2, correspond to the four places in the numerical values to be set. Display 104 is the current value (current numerical value) display on the front 101a of the case 101. It can, for example, be made of seven-segment LEDs. Below the current value numeric display 104 on the front 101a of case 101 is a four-place set value numeric display 105, which may also be made from seven-segment LEDs. On the face 101a is reset switch 106 with reset key 106a. Built into the interior of the case 101 and protected by cover C is mode switch assembly 107. This assembly may consist, for example, of eight dipswitches 108. When the key 108a of each dipswitch 108 is moved in direction a shown by the arrow, the input is switched on; when it is moved in direction b , the input is switched off. Fig. 2 is a frontal view of the face 101a of the case 101. The current value numeric display 104 shows "2806", while the set value display 105 shows "3462". The keyswitches 103A through 103D have up-counting keys 103a through 103d and down-counting keys 103a1 through 103d1. The four pairs of keys correspond to the four places in displays 104 and 105. On the face 101a of the case 101 is reset display 109, which lights up to display the state of the reset input entered via reset switch 106. When reset key 106a is operated, contact is made or broken in switch 106. The state of this input is shown when reset display 109 lights up. The output display 110, adjacent to reset display 109 on face 101a of the case 101, lights up to display the output state of the output circuit. If key protectors are installed on the switches 103A through 103D to prevent the values which have been set from being changed, a key protection display 111 is provided. This display lights up to show the input state of the key protectors. Fig. 3 is a block diagram showing the essential components of a counter designed as discussed above. The keyswitch circuit 112 is connected to the switches 103A through 103D and to reset switch 106. The mode switching circuit 113 switches the mode, and contains the dipswitches 108. With the help of microprocessor 114, the control circuit for input and output, mode switching circuit 113 switches the input mode of circuit 115, the circuit for input of numerical values, and the output mode of output circuit 116, which controls other devices and maximum counting speed and the one-shot output time. The system reset circuit is indicated as 117. When the reset is pushed after the power from power supply circuit 118 has been applied, the system will return to ordinary counter operating mode, as shown in Fig. 2 . If, on the other hand, reset key 106a is pushed before the power from circuit 118 is applied, reset switch 106 will enter the ON state. When power is applied to circuit 118, the ON or OFF state of each dipswitch 108 in mode switch assembly 107 will be displayed via current value display 104 and the set value display 105 as either a character 8 or a dash, as shown in Fig. 4. A character 8 indicates that the input of the corresponding dipswitch 108 is on; a dash indicates that it is off. If the dipswitch 108 consist of eight switches arrayed in direction c-d indicated by an arrow, then the on-off state of switches #1 through #4 can be shown on segments #4a through #4d of current value numeric display 104, and the on-off state of switches #5 through #8 can be shown on segments #5a through #5d of set value display 105. The counter shown in Fig. 4 is set to dipswitch display mode. From this display, the operator can verify that switches #2, #3, #5, #6 and #8 are on, while switches 1, 4 and 7 are off. The microprocessor 14 controls the input and output by synchronizing them with clock pulses generated by circuit 119. The procedure followed in a counter configured as described above when switching between normal counter operating mode and dipswitch display mode, with reference to the flowchart in Fig. 5 will now be described. If the operator uses switches 103A through 103D to set, for example, the value "3462", this value will be stored in microprocessor 114 when power is applied to circuit 118, and it will appear on set value display 105, as shown in Fig. 2. The on-off state of reset switch 106 and the on-off states of the eight dipswitches 108 in mode switch assembly 107 are also stored in the microprocessor 114. The microprocessor 114 distinguishes whether or not there is pressure on reset key 106a, that is, whether switch 106 is on or off (Step 20: Judgment). If the key 106a is not depressed, counting will proceed in normal counter operating mode; the number "2806" will appear on current value display 104; and the number "3462" will appear on set value display 105 (Step 21: Processing). When the aforesaid numerical value reaches the set value, 3462, circuit 116 will output an ON signal. If reset key 106a is held down so that reset switch 106 is on when power is applied to the circuit 118, the judgment will be made in Step 20 that key 106a has been pressed, and the on-off states of dipswitches #1 through #8 will be displayed on segments 104a through 104d of current value display 104 and 105a through 105d of set value display 105, as shown in Fig. 14 (Step 22: Processing). An "8" will be displayed if the input of that dipswitch is on, and a dash will be displayed if it is off. If the dipswitches 108 consist of eight switches arrayed in direction c-d indicated by an arrow in Fig. 1, then the on-off state of switches #1 through #4 will be shown on segments 104a through 104d of current value display 104, and the on-off state of switches #5 through #8 will be shown on segments 105a through 105d of set value display 105. The counter shown in Fig. 4 is set to dipswitch display mode. From this display, the operator can verify that switches #2, #3, #5, #6 and #8 are on, while switches #1, #4 and #7 are off. The entire process of verification is extremely simple. A further embodiment will now be described in detail. In this embodiment, the control device is a timer. Since the external appearance of this timer is virtually identical to that shown in Fig. 1 and its essential components are virtually identical to those shown in Fig. 3, further diagrams and discussion of these common aspects have been omitted. The timer of this embodiment does have aspects in which it differs from the preceding embodiment. The primary values appearing on current value display 104 and set value display 105 will be current time and set time. Mode switching circuit 113 in Fig. 3 switches the mode of circuit 115, which is used to input numerical values; the mode of circuit 116, which controls other devices; maximum counting speed; and input filter time. The auxiliary value which can be set or changed is the one-shot output time, which will be discussed below. Assume that before power was applied, a predetermined up and down-counting keys 103a through 103d and 103a1 through 103d1 were pressed to turn on certain of the four switches 103A through 103D, which constitute the main input switches. In this case, switches 103A and 103B were turned on when the operator pressed down-counting keys 103a1 and 103b1 before power was applied to circuit 118. When power is applied to circuit 118, the device shifts into the mode for setting the one-shot output time. The value for the one-shot output time which is currently set, in this case "1.00sec", will appear in set value display 105 as shown in Fig. 6. When the timer is in the mode for setting the one-shot output time, as discussed above, current value display 104 will be off so that the operator can distinguish clearly by eye the display used for this mode from that used for normal mode or other modes. In the mode for setting the one-shot output time, just as in normal mode, the user selects a value by manipulating as the user chooses the up keys 103a through 103d and the down keys 103a1 through 103d1 to set the four switches 103A through 103D. The value for the one-shot output time which the user has set appears on the set value display 105 in real time. The one-shot output time can be set anywhere in the range between 0.01 sec. and 99.99 sec. If the value is set to 0.00 sec., the output will be held, and will normally remain on from the time of output until it is reset. Like values set in normal mode, the one-shot output time which has been set or changed will be written into and stored in the system memory (e.g. an EEPROM, not pictured) when the power supply is cut off. When the timer is in the mode for setting the one-shot output time, the control output is off; timing cannot be performed; START and RESET commands cannot be input; and the reset key cannot be operated. The procedure followed in a timer configured as described above when switching between normal operating mode and setting mode for one-shot output time, with reference to the flowchart in Fig. 7 will now be described. When the operator sets a value, say "1200", by operating switches 103A through 103D, this value will be stored in the system memory of microprocessor 114 and will appear on set value display 105 when power is applied to circuit 118. The on-off state of reset switch 106 and the on-off states of the eight dipswitches 108 in mode switch assembly 107 are also stored in the microprocessor 114. The microprocessor 114 distinguishes whether or not there is pressure on keys 106a, 103a through 103d and 103a1 through 103d1 (Steps 30-32: Judgments). If keys 106a, 103a, 103b, 103a1 and 103b1 are not depressed, the timer will be in normal operating mode, timing will be performed, and the current value and the set time will appear on current value display 104 and set value display 105 (Step 33: Processing). In normal operating mode, when the timing value and the set time coincide, circuit 116 will output an ON signal. If any of the keys 106a, 103a, 103b, 103a1 and 103b1 have been pressed, which combination of keys has been pressed will be determined when power is applied to circuit 118. If only down keys 103a1 and 103b1 are on, the timer will shift into the mode for setting the one-shot output time. If only reset key 106a and up keys 103a and 103b are on, the timer will shift into the hardware testing mode. If only reset key 106a is on, it will shift into the dipswitch display mode. Dipswitch display mode remains in effect only as long as reset key 106a is depressed. When key 106a is released, this mode goes off, and the timer reverts to normal operating mode. For all other modes, the mode will be selected based on the judgment made at the time power is applied, and the timer will remain in the selected mode as long as power continues to be applied to circuit 118. When the timer has shifted into the mode for setting the one-shot output time, as discussed above, values are set just as in normal setting mode. The operator selects a value by manipulating as he chooses the up keys 103a through 103d and the down keys 103a1 through 103d1 to set the four aforementioned rotary switches 103A through 103D. The value for the one-shot output time which he has set appears on the aforesaid set value display 105 in real time. When the power supply is cut off, the one-shot output time which has been changed as described above will be stored in the system memory. In the preferred embodiments discussed above, this invention was applied to a counter and a timer. It would, of course, also be possible for a control device designed according to this invention to be a thermoregulator or other control device. As discussed above, the control device described above shows on the aforesaid display the on-off state of each dipswitch when the appropriate switch is held down while power is being applied. This display stays on as long as the switch is depressed. This enables the operator to easily verify the state of the dipswitches by viewing the front of the case regardless of whether the case is mounted on the control panel. Thus, it significantly reduces the labor required to verify the state of the switches. The control device may be distinguished by the fact that when a predetermined key, which is one of the operating keys of the main input switch assembly, is held down while the power supply is being connected, the device shifts into auxiliary setting mode and the current auxiliary values are displayed on the main numeric display. The auxiliary values can be set or changed easily, and no special switches are needed. There is no mode key, so the user cannot accidentally change the values, nor can they be changed as a joke or prank. Since one set of operating keys on the front of the case is used to set both the main and the auxiliary values, the size of the keytops can be increased to make it easier for the user to operate the switches. Using the operating keys to change the auxiliary values allows greater accuracy and precision than do dipswitches or a continuously variable switch.

Claims: A control device for controlling electronic equipment with a display, comprising: a control circuit (114); a mode-switching assembly for switching among operation modes, the assembly including a number of internal manual switches (108) connected to said control circuit (114); and a display assembly (101a) including a plurality of key switches (102) electronically connected to said control circuit (114), wherein said control circuit (114) can be actuated to display the ON/OFF mode of said internal manual switches (108). A device according to claim 1, wherein at least one predetermined key switch (106a) when actuated just prior to supplying power to the device initiates the display of the ON or OFF state of each internal manual switch (108). A device according to claim 1, wherein said manual internal switch (108) is a dipswitch. A device according to claim 2, wherein said control circuit (114) is configured to display the ON or OFF state of each internal manual switch (108) only while said predetermined switch (106a) is held down and remains depressed. A device according to claim 1, wherein at least one predetermined key switch (103a1, 103b1) when actuated just prior to supplying power to the device causes the switch assembly to shift to its auxiliary setting mode with the current auxiliary values displayed on a main numeric display (105) allowing the auxiliary values to be changed by subsequently operating said key switches (102) in auxiliary mode. A device according to claim 5, wherein said auxiliary values is a one shot output time for the device. A device according to claim 5, wherein an output time which has been set will be stored in the system memory if the power is cut off.

Inventors: NAKAGAWA YOSHIHISA, WAKABAYASHI TAKESHI, YAMAMOTO HIROYUKI, NAKAGAWA, YOSHIHISA, WAKABAYASHI, TAKESHI, YAMAMOTO, HIROYUKI
Applicants: OMRON TATEISI ELECTRONICS CO, OMRON CORPORATION
Application year: 1993
Main classification: H05K5
IPC codes: H01H9, G05B19, G04G15, H01H1, H05K5