JP3356631B2 - Control system with LCD display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system applied to, for example, a power receiving and distribution facility, an FA facility, and the like, and relates to a control system using an LCD display for controlling a control target by operating a touch panel switch on the LCD display. .

[0002]

2. Description of the Related Art As a conventional control system using an LCD display, for example, an operation signal of a touch panel switch of the LCD display is transmitted as it is to a programmable controller (hereinafter, referred to as a PLC) by serial transmission.
There is a digital output (hereinafter referred to as "DO") or an output of a remote I / O to control an object to be controlled.

[0003]

However, in such a conventional control system using an LCD display, a human operation error, an abnormality in the LCD display, an abnormality in the serial transmission device,
Alternatively, when there is an abnormality in the PLC or the like, there is a problem that an erroneous control signal is output and reliability may be reduced.

[0004] The present invention has been made in view of the above,
It is an object of the present invention to provide a control system using an LCD display that can prevent malfunction due to human operation error, LCD display error, serial transmission device error, PLC error, etc., and can reduce wiring and improve reliability. And

[0005]

According to a first aspect of the present invention, there is provided an LCD display having a touch panel switch, and a control target which receives a touch switch operation signal by operating the touch panel switch. A control system based on an LCD display having a programmable controller for program-controlling the operation of the touch panel switch. A key signal is generated by ANDing a normal output signal of the LCD display indicating that there is a normal output signal and a normal output signal of the PLC indicating that the programmable controller is normal in a wired hard sequence, and the key signal and the programmable signal are generated. AND with controller output And summary to become configured to output a control signal for controlling the more the control target. With this configuration, the output of the erroneous control signal is prevented in the case of a human operation error, an LCD display error, or a programmable controller error.

According to a second aspect of the present invention, there is provided an LCD display having a touch panel switch, a programmable controller for inputting a touch switch operation signal by operating the touch panel switch and outputting a signal for program-controlling a control target, and the programmable controller. In a control system using an LCD display having a remote I / O for inputting an output signal of a controller by serial transmission, a pushbutton switch signal for determination by operating a pushbutton switch for determination for determining operation of the touch panel switch; LCD indicating that the LCD display is normal
A key signal is created by ANDing a display normal output signal and a PLC normal output signal indicating that the programmable controller is normal in a wired hard sequence, and outputs the key signal and the output of the remote I / O. And outputs a control signal for controlling the control object by AND with the above. With this configuration, the output of the erroneous control signal is prevented in the case of a human operation error, an LCD display error, a serial transmission error, a programmable controller error, or a remote I / O error.

According to a third aspect of the present invention, in the control system using the LCD display according to the first or second aspect, the fixed cycle clock signal is transmitted from the programmable controller to the LCD display by serial transmission,
The D display answers the fixed-period clock signal to the programmable controller, and monitors whether or not the fixed-period clock signal is normally answered back on the programmable controller side.
The gist of the present invention is that it is configured to confirm the normality of the CD display and the serial transmission. With this configuration, it is possible to detect abnormality in the LCD display and serial transmission by software processing.

According to a fourth aspect of the present invention, in the control system according to the second or third aspect of the present invention, the programmable controller is a ladder sequence software for executing an internal process.
O, the LCD display normal output signal, the remote I / O normal signal and the remote I / O in the RAS information of the programmable controller.
In this case, software output is performed by ANDing the normal signal of serial transmission with the touch switch operation signal. With this configuration, if there is a human operation error, an LCD display error, a serial transmission error, or a remote I / O error, the erroneous output is prevented even in the soft output in the programmable controller. .

According to a fifth aspect of the present invention, in the control system using the LCD display according to any one of the first to fourth aspects, the programmable controller operates the touch switch operation in the input processing of the touch switch operation signal. After double-reading the signal and confirming that the double-read touch switch operation signals are turned on for a certain period of time, AND the respective touch switch operation signals to obtain the touch switch operation signal. The gist of the present invention is that: With this configuration, when a touch switch operation signal is input to the programmable controller, an erroneous input such as a transient noise such as a lightning surge and an opening / closing surge is prevented.

According to a sixth aspect of the present invention, in the control system using the LCD display according to any one of the first to fifth aspects, a touch switch for determination is replaced with a touch switch for determination instead of the push button switch for determination. The gist of the present invention is that, in place of the confirmation push button switch signal, a confirmation touch switch signal is output by a touch operation of the confirmation touch switch. With this configuration, easiness of the determination operation can be obtained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are diagrams showing a first embodiment of the present invention. First, the configuration of a control system using an LCD display according to the present embodiment will be described with reference to FIG.
In FIG. 1, a touch panel switch 2 is provided in an LCD display 1. A touch switch operation signal input by operating the touch panel switch 2 is an LCD.
Processed in the display unit 1 and transmitted by the serial transmission device 3
The data is transmitted to C4. The transmitted signal is further processed in the PLC 4 for program-controlling the control target 10, and the control output is output from the DO output unit 5 of the PLC 4. On the other hand, in the vicinity of the disposition portion of the LCD display 1,
A push button switch 6 for determination by hardware for determining the operation of the touch panel switch 2 is provided,
A push button switch signal for confirmation by operating the push button switch 6 for confirmation, a normal output signal of the LCD display by the hard output contact 7 of the LCD display 1, and a PLC
A key signal 9 is generated by ANDing the PLC normal output signal from the hard output contact 8 of the PLC 4 with a wired hard sequence, and the control target 10 is controlled by ANDing the key signal 9 with the DO output of the PLC 4. It outputs a control signal.

Next, the operation of this embodiment will be described with reference to the timing chart of FIG. Pattern 1 in the same figure
To explain, the touch switch operation signal 11a input by operating the touch panel switch 2 is:
The signal is transmitted to the PLC 4 and becomes a touch switch hold signal 12 a in the PLC 4. Then, the LCD display normal output signal 13a indicating that the LCD display 1 is normal
And a PLC normal output signal 14a indicating that the PLC 4 is normal, a key signal 16a is created when the confirmation push button switch signal 15a is turned on, and the key signal 16a and the DO signal are generated. The control output signal 17a, which is an AND output with the output, turns ON. Next, pattern 2 will be described. O of touch switch operation signal 11b
N: Touch switch hold signal 12 in PLC 4
b turns ON. Thereafter, even if the LCD display normal output signal 13b indicating that the LCD display 1 is normal is ON, the PLC normal output signal 14b is OFF and the PLC 4
Is abnormal, the confirmation push button switch signal 15b
Key signal 16b is not created even when
The control output signal 17b is turned off.

As described above, according to the first embodiment, since a key signal is generated by wired hardware, a human operation error, an abnormality in the LCD display 1, an abnormality in the serial transmission device 3, or an error in the PLC 4 In either case, the erroneous control output can be prevented, and the reliability can be increased. Further, the number of wirings can be reduced as compared with the case where all of them are wired and hard, and wiring can be reduced.

FIG. 3 shows a second embodiment of the present invention. FIG. 3 shows the first embodiment shown in FIG.
3 is different from the PLC 4 in FIG. 3 in that the PLC 4 does not have a DO output unit, and a remote I / O 18 connected to the PLC 4 by a serial transmission device 19 is provided. Then, a control signal for controlling the control target 10 is output by ANDing the key signal 9 created in the same manner as in the first embodiment and the output of the remote I / O 18.

As described above, according to the second embodiment, the key signal is generated by the wired hardware in the same manner as described above, so that a human operation error, an abnormality in the LCD display 1, the serial transmission device 3 , 19, the PLC 4 or the remote I / O 18, an erroneous control output can be prevented, and the reliability can be increased.

FIG. 4 shows a third embodiment of the present invention. In the present embodiment, the answer-back method
This is to check whether the D display 1 and the serial transmission device 3 are normal. In FIG. 4, a fixed period clock signal 20 is output from the PLC 4 to the LCD
The CD display 1 internally processes this clock signal,
The clock signal 21 is answered back to C4. PLC
In step 4, it is monitored whether or not the answer-backed clock signal 21 is normally turned on / off at predetermined time intervals. If the answer is normal, the normality of the LCD display 1 and the serial transmission device 3 is confirmed. If it remains ON or OFF, the LCD display 1 and the serial transmission device 3 are regarded as abnormal.

As described above, according to the third embodiment, since the abnormality detection processing is performed by software, the LCD display 1 and the serial transmission device 3 can be connected without newly providing wiring.
Abnormality can be detected.

FIG. 5 shows a fourth embodiment of the present invention. In the present embodiment, erroneous output is prevented even in soft output in the PLC 4. FIG.
4 shows a ladder sequence diagram for executing the internal processing of FIG. Touch switch operation signal 22 from LCD display 1
Is an LCD display / serial transmission device normal signal 23,
The RAS (Reliability) of PLC4
Availability (serviceability) information, the remote I / O transmission normal signal 24 in the information,
Similarly, it is output to the internal register a26 by AND with the remote I / O normal signal 25 in the RAS information, and is held by the hold circuit 27. And the internal register a
And the input signal 30 of the ladder sequence output coil is turned on by ANDing the load 28 and the key signal 9 with the key signal software 29 input into the PLC 4 by I / O,
This ON releases the hold of the internal register a26, and performs the soft output of the PLC4.

As described above, according to the fourth embodiment, an erroneous output can be prevented even in the soft output in the PLC 4.

FIG. 6 shows a fifth embodiment of the present invention. In the present embodiment, in input processing of a touch switch operation signal to the PLC 4, erroneous input such as transient noise is prevented. FIG. 6 is a flowchart showing the input processing of the touch switch operation signal in the PLC 4. The touch switch operation signal from the LCD display 1 is input as an address a in step 31a.
Next, in step 32a, it is confirmed that the address "a" is continuously turned on for a predetermined timer time. Similarly, LC
Step 3: Touch switch operation signal from D display 1
In step 1b, the address b is input as another address b.
Make sure to N. In step 33, AND of both addresses a and b is taken, and it is considered that a touch switch operation signal has been input.

As described above, according to the fifth embodiment, in order to confirm double reading and continuous ON of the touch switch operation signal, an erroneous input such as a transient noise such as a lightning surge or a switching surge is performed. Can be prevented.

FIG. 7 shows a sixth embodiment of the present invention. In the present embodiment, a determination push button switch is provided as a determination touch switch in a touch operation panel so that a key signal can be output by a touch operation. In FIG. 7, the touch switch 34 for confirmation is LC
It is provided in a touch operation panel of the D display 1. An operation signal of the touch switch 34 for confirmation is output from the DO output unit 35 of the LCD 1 as a hard contact output. Then, the touch switch signal for determination by touch operation of the touch switch for determination 34 and the LCD display 1
LCD display normal output signal and P4 that PLC4 has
A key signal 9 is created by ANDing the LC normal output signal with a wired hard sequence.
A control signal for controlling the control target 10 is output by ANDing the output of the remote I / O 18.

As described above, according to the sixth embodiment, the confirmation touch switch 34 is provided in the touch operation panel, so that the human interface is improved and high reliability is obtained.

FIG. 8 shows a seventh embodiment of the present invention. This embodiment is different from the sixth embodiment shown in FIG.
, A key signal bus line is provided.
8 differs from FIG. 7 in that the power supply of the board having the PLC 4 is connected to the contact of the key signal 9 and the key signal 9 is connected.
Is provided. By connecting the output contact of the remote I / O 18 to the bus line 36, a control signal for controlling the control target 10 is output.

As described above, according to the seventh embodiment, since the bus line for the key signal is provided, the power supply to the interface destination panel, that is, even if the number of remote I / Os is large, may be one. Wiring is simplified and high reliability is obtained.

[0027]

As described above, according to the first aspect of the present invention, the pushbutton switch signal for determining the operation of the pushbutton switch for determining the operation of the touch panel switch and the LCD display device are displayed. A key signal, which is obtained by ANDing a normal output signal of the LCD display indicating normal operation and a normal output signal of PLC indicating normal operation of the programmable controller in a wired hard sequence, is generated. Since the control signal for controlling the control target is output by ANDing with the output of the programmable controller, the control signal of the erroneous control signal is output regardless of any human operation error, LCD display error, or programmable controller error. Output is prevented and reliability can be improved. Further, the number of wirings can be reduced as compared with the case where all of them are wired and hard, and wiring can be reduced.

According to the second aspect of the present invention, a decision push button switch signal by operating the decision push button switch for confirming the operation of the touch panel switch,
A key signal is created by ANDing the LCD display normal output signal indicating that the LCD display is normal and the PLC normal output signal indicating that the programmable controller is normal in a wired hard sequence. Since the control signal for controlling the control object is output by ANDing the key signal and the output of the remote I / O,
2. The output of an erroneous control signal is prevented in the case of a human operation error, an LCD display error, a serial transmission error, a programmable controller error, or a remote I / O error. There is an effect similar to the effect of the invention.

According to the third aspect of the present invention, the fixed-cycle clock signal is supplied from the programmable controller to the L-level.
Transmitted to a CD display by serial transmission, the LCD display answers the fixed-period clock signal to the programmable controller, and determines whether the fixed-period clock signal has been normally answered back on the programmable controller side. Since the monitoring is configured to confirm the normality of the LCD display and the serial transmission, it is possible to detect the abnormality of the LCD display and the serial transmission by software processing without providing new wiring. Therefore, the reliability can be increased with reduced wiring.

According to the fourth aspect of the present invention, the ladder sequence software for executing the internal processing, the programmable controller inputs the key signal by I / O, and outputs the LCD display normal output signal and the programmable signal. Since the controller is configured to perform a soft output by ANDing the normal signal of the remote I / O and the normal signal of serial transmission with the remote I / O in the RAS information stored in the controller and the touch switch operation signal,
In the event of a human operation error, LCD display error, serial transmission error, or remote I / O error, erroneous output is also prevented in software output in the programmable controller, and reliability is reduced. It can surely be improved.

According to the fifth aspect of the present invention, in the input processing of the touch switch operation signal, the programmable controller double-reads the touch switch operation signal, and each of the double-read touch switch operation signals is processed. After confirming that the touch switch operation signal is turned on for a certain period of time, an AND operation of each of the touch switch operation signals is performed to input the touch switch operation signal. Erroneous input such as noise can be prevented, and the reliability can be increased.

According to the sixth aspect of the present invention, a fixing touch switch is provided in the LCD display in place of the fixing push button switch, and the fixing push button switch signal is replaced with the fixing push button switch signal. Since the configuration is such that the touch switch signal for determination is output by the touch operation of the touch switch, the human interface can be improved and the reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a first embodiment of a control system using an LCD display according to the present invention.

FIG. 2 is a timing chart for explaining the operation of the first embodiment.

FIG. 3 is a system configuration diagram showing a second embodiment of the present invention.

FIG. 4 is a block diagram showing a normality checking unit of an LCD display according to a third embodiment of the present invention.

FIG. 5 is a diagram illustrating a ladder sequence for executing internal processing of a PLC according to a fourth embodiment of the present invention.

FIG. 6 is a flowchart illustrating a process of inputting a touch switch operation signal to a PLC according to a fifth embodiment of the present invention.

FIG. 7 is a system configuration diagram showing a sixth embodiment of the present invention.

FIG. 8 is a system configuration diagram showing a seventh embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 LCD display 2 Touch panel switch 3, 19 Serial transmission device 4 PLC (programmable controller) 6 Push button switch for confirmation 10 Control target 18 Remote I / O 34 Touch switch for confirmation

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsuyoshi Sugimoto 2-24-24 Harumi-cho, Fuchu-shi, Tokyo Toshiba FA System Engineering Co., Ltd. (72) Inventor Takeshi Watanabe 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Fuchu Plant (56) References JP-A-2-100104 (JP, A) JP-A-7-146664 (JP, A) JP-A-7-219628 (JP, A) JP-A-2-263205 ( JP, A) JP-A-7-191389 (JP, A) JP-A-8-123502 (JP, A) JP-A-57-118401 (JP, U)

Claims (6)

(57) [Claims] 1. A control system using an LCD display having an LCD display having a touch panel switch and a programmable controller for inputting a touch switch operation signal by operating the touch panel switch and program-controlling a control target. A pushbutton switch signal for determining the operation of the pushbutton switch for determining the operation of
Creating a key signal by ANDing the LCD display normal output signal indicating that the D display is normal and the PLC normal output signal indicating that the programmable controller is normal in a wired hard sequence; A of the key signal and the output of the programmable controller
A control system using an LCD display, which is configured to output a control signal for controlling the control target by ND. 2. An LCD display having a touch panel switch, a programmable controller for inputting a touch switch operation signal by operating the touch panel switch and outputting a signal for program-controlling a control target, and serializing an output signal of the programmable controller. In a control system using an LCD display having a remote I / O input by transmission, a decision pushbutton switch signal by operating a decision pushbutton switch for confirming operation of the touch panel switch, and the LCD display being A key signal is created by ANDing a normal output signal of the LCD display indicating normal operation and a normal output signal of PLC indicating normal operation of the programmable controller in a wired hard sequence. The remote I / A control system using an LCD display, wherein a control signal for controlling the control target is output by ANDing with an output of O. 3. The fixed cycle clock signal is transmitted from the programmable controller to the LCD display by serial transmission, and the LCD display answers the fixed cycle clock signal to the programmable controller, and the programmable controller side transmits the fixed cycle clock signal to the programmable controller. 3. The system according to claim 1, wherein the fixed period clock signal is normally answered back to monitor whether the LCD display and the serial transmission are normal. Control system with LCD display. 4. The ladder sequence software which executes internal processing, inputs the key signal by I / O, and outputs the LCD display normal output signal and RAS information stored in the programmable controller. A software output is performed by ANDing a normal signal of the remote I / O, a normal signal of serial transmission with the remote I / O, and the touch switch operation signal. 4. A control system using an LCD display according to 2 or 3. 5. In the input processing of the touch switch operation signal, the programmable controller double-reads the touch switch operation signal, and confirms that each of the double-read touch switch operation signals is turned on for a predetermined time. After that, the AND of each touch switch operation signal
The control system according to any one of claims 1 to 4, wherein the control system is configured to input the touch switch operation signal. 6. A fixing touch switch is provided in the LCD display instead of the fixing push button switch, and a fixing operation is performed by touching the fixing touch switch instead of the fixing push button switch signal. The control system according to any one of claims 1 to 5, wherein the control system is configured to output a touch switch signal.