JP2623021B2 - Industrial equipment - Google Patents

Description

The present invention relates to an industrial device that automatically starts drive control of a load at a reserved time.

(B) Prior art In the case of industrial equipment used in factories, such as a microwave drying apparatus disclosed in Japanese Patent Application No. 1-47803 (Japanese Patent Application Laid-Open No. 2-227213), the load is reduced when the reserved time comes. There is a case where the drive control is automatically started. in this case,
After the reservation time is set, the operator is generally away from the industrial equipment until the drive control of the load is actually started. During this time, if the microcomputer that controls the drive of the load malfunctions due to noise, the load is changed to the operator. It is extremely dangerous to do undesired movements while you are away.

In this regard, it is conceivable as one solution to replace a microcomputer or the like of industrial equipment with one having noise resistance, but this is insufficient. That is, the industrial equipment is generally used as a system together with other industrial equipment in a factory having many noise sources, and the noise resistance is reduced with the systemization.
One reason is that there is no large-scale noise simulator for evaluating the noise resistance of the entire system.

(C) Problems to be Solved by the Invention The present invention relates to a configuration in which an industrial device that automatically starts drive control of a load at a reserved time is systematized and used together with another industrial device in a factory or the like. It is intended to remarkably suppress the malfunction of the load of the industrial equipment after the setting of the reservation time and before the start of the drive control.

(D) Means for Solving the Problems The present invention relates to an output circuit connected in series to a load to drive and control the load, a condition setting input unit for setting the driving condition of the load, and a drive of the condition setting input unit. A control unit for turning on and off the output circuit based on a condition, wherein a reservation timer independently driven from the control unit for setting a start time to start driving the load at a desired time; and A timer switch connected to the output circuit that turns on when a start time is reached by a timer, and a predetermined time timer provided in the control unit that measures a predetermined time after setting the start time of the reservation timer, The control unit is configured not to drive the output circuit even if the timer switch is turned on until the predetermined time timer measures a predetermined time.

(F) Embodiment FIG. 1 shows a circuit of an industrial device according to an embodiment of the present invention.

Part number LC-6522 manufactured by Sanyo Electric Co., Ltd.
A microcomputer 1 of C is provided. The microcomputer includes setting information from a condition setting input unit 2, sensor detection information from a sensor unit 3, operation information of a start reservation key 4 and a start key 5, a main switch 6
And operation information of the timer switch 7 is input. The main switch 6 and the timer switch 7 are in a serial relationship with each other, and are respectively connected to the input ports PA ₀ and PA ₁ of the microcomputer 1 via the interface 8. The timer switch 7 is linked to a timer device 9 serving as a reservation timer that is driven independently of the microcomputer 1. The microcomputer 1 controls a display section 10 for displaying various information and controls an output circuit 11 composed of a switching element on and off based on inputs from the respective sections. The output circuit 11 constitutes a series circuit with the commercial power supply 12 together with the main switch 6 and the timer switch 7, and a heavy electric load 13 is interposed in the series circuit.
A power supply circuit 14 connected to the commercial power supply 12 supplies a DC drive voltage to the microcomputer 1.

FIG. 2 shows the flow of a program incorporated in the microcomputer 1, and the operation of the industrial equipment will be described below with reference to FIG.

When the commercial power supply 12 is turned on to the industrial equipment, the S1 step is executed, and the microcomputer 1 is initially reset. Next, in step S2, input port P
The signals input to A ₀ and PA ₁ are examined, and it is determined whether the signals input to these ports are 0 and 1, respectively. When the commercial power supply is turned on, the main switch 6 and the timer switch 7 are turned off and on as initial states, and accordingly, the signals input to the input ports PA ₀ and PA ₁ are 0 and 1, respectively. In this case, a positive determination is made in step S2.

Thus, the steps S2 and S3 are cyclically executed. In step S3, it is checked whether or not the standby flag in the microcomputer 1 has been set. Such S2 and S3
The circulation execution state of the steps is referred to as a main switch off mode. At this time, since the main switch 6 is off, even if the microcomputer 1 or the like malfunctions due to noise and the output circuit 11 is turned on, the undesired movement of the heavy electric load 13 is suppressed.

When the main switch 6 is turned on in the main switch off mode, the signals input to the input ports PA ₀ and PA ₁ become 1 and 1, and a negative determination is made in step S2. Then, steps S4 and S5 are executed, and it is determined whether or not the operation of the start reservation key 4 and the reset of this operation have been performed. At this time, neither the operation of the start reservation key 4 nor the reset of this operation has been performed.
Step S6 is executed. In this step, it is determined whether the signals input to the input ports PA ₀ and PA ₁ are 1 and 1, respectively. In this case, the main switch 6 is also turned on, and the signals input to both input ports PA ₀ and PA ₁ are 1, 1, and an affirmative determination is made in step S6. Thereafter, it is determined in step S7 whether or not the standby flag is set. Since this flag is not set now, it is determined in step S8 whether the condition setting input unit 2 has set a new condition. At this time, there is no new condition setting, and it is checked in step S9 whether the start key 5 has been operated. If there is a new condition setting, step S10 is executed after step S8 but before step S9, and the new condition is written in a predetermined area in the microcomputer 1.

And S2, S4, S5, S6, S7, S8 (or S10), S9
The steps are performed cyclically. This circulation execution state is called a main switch-on mode.

In this main switch-on mode, when the start key 5 is operated, S12 step is executed from S9 step to S11 step in this mode. In this step, on / off control of the output circuit 11 is performed in accordance with a prescribed condition (if there is a new condition setting, this new condition), and drive control of the heavy electric load 13 is started. In the next step S13, it is determined whether or not the drive control has been executed for a predetermined time. After the execution of the predetermined time, the control of the output circuit 11 is stopped in the subsequent S14 step, and the drive control of the heavy electric load 13 ends.

Now, a case where the drive control of the heavy electric load 13 is started at a set reservation time will be described.

First, in the main switch-on mode, the start reservation key 4 is operated. Then, steps S4 to S15 of the main switch-on mode are executed, and the setting of the reservation flag in the microcomputer 1 and the display section
The reservation LED in 10 is turned on. Thereafter, the main switch-on mode is executed again.

In this state, the timer device 9 sets the current time to 1
Set the start reservation time after a time. Then, the timer switch 7 is turned off. When the main switch 6 is turned off, the main switch 6 is also disconnected from the commercial power supply 12 to be substantially turned off. Therefore, the signals input to the input ports PA ₀ and PA ₁ are both 0 and 0.

Thus, the input signals to the input ports PA ₀ and PA ₁ are 0, 0
Then, a negative determination is made in step S6 of the main switch-on mode, and then a determination is made in step S16 as to whether or not a reservation flag has been set. In this case, the reservation flag has been set, and then step S17 is executed to determine whether the standby flag has been set. At this time, the standby flag is not set. Thereafter, in step S18, the counting operation of the internal timer serving as the predetermined time timer in the microcomputer 1 is started, and the standby flag is set.

Then, steps S2, S4, S5, S6, S16, and S17 are cyclically executed. This circulation execution state is called a reservation standby mode.

When the current time reaches the start reservation time,
The timer device 9 operates to turn on the timer switch 7. At this time, since the main switch 6 has already been turned on as described above, the signals input to the input ports PA ₀ and PA ₁ are both 1 and 1. Then, steps S6 to S7 in the reservation standby mode are executed. In this case, since the standby flag is in the set state, step S19 is executed next. In this step, it is determined whether or not the count time of the internal timer, which has started counting in step S18 (when the start reservation time is set), is equal to or longer than one hour, which is a predetermined time. In this case, in setting the start reservation time, the start reservation time at least one hour later than the current time is set, and when the current time has actually reached the start reservation time, the start reservation time setting is performed. The count time of the internal timer counting from time is 1 hour or more. Therefore, a positive determination is made in step S19.

Based on this affirmative determination, step S11 is subsequently executed to reset the internal timer and various flags, and
Is turned off. Thereafter, as described above, S12, S13, S14
The steps are sequentially executed, and the drive control of the heavy electric load 13 starts and ends at the set reservation time.

Here, if the main switch 6 is turned off in the reservation standby mode, when the current time reaches the start reservation time and the timer switch 7 is turned on, an input is made to the input ports PA ₀ and PA ₁ . The signals become 0 and 1, respectively. Then, the steps from S2 step to S3 step in the reservation waiting mode are performed.
Step S20 is executed. In this step, as in step S11, the internal timer and various flags are reset and the reserved LED is turned off. As a result, the drive control of the heavy electric load 13 at the set reservation time is prohibited.

Further, in the reservation standby mode, when the timer device 9 is operated to cancel the setting of the start reservation time within one hour from the setting of the start reservation time, or when the timer device 9 sets the start reservation time, the timer switch is set. If chattering 7 occurs, the following occurs.
That is, at this time, the timer switch 7 is set in the reservation standby mode.
Turns on, and the signals input to input ports PA ₀ and PA ₁ are 1, 1
Becomes As a result, in the same manner as when the current time reaches the start reservation time, the steps S6 to S7, S1
Nine steps are performed sequentially. However, in step S19, since the count time of the internal timer has not reached one hour or more, step S21 is thereafter executed. In this step, the count of the internal timer is temporarily stopped, and the standby flag is reset. Thus, the execution of the step S12 and the subsequent steps following the step S19 is not performed, and the heavy electric load 13 is not undesirably driven and controlled.

In this case, then S2, S4, S5, S6, S7, S8 (or S1
0), the main switch-on mode circulating in step S9 is executed. At this time, if the start key 5 is operated as necessary, the drive control of the heavy electric load 13 is started as described above. At the time of this drive control, step S11 is executed, and the contents relating to the reserved start time are reset.

In this main switch-on mode, when the timer device 9 is operated to turn off the timer switch 7 again,
After execution of the steps S16, S17 and S18, the above-mentioned reserved standby mode is restarted.

(G) Effects of the Invention According to the present invention, even in a configuration where a system is used together with other industrial equipment in a factory or the like having many noise sources,
It is possible to prevent the control unit from malfunctioning and the load from undesirably starting operation, thereby significantly improving the safety of the industrial equipment.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a flowchart of a program incorporated in a microcomputer in the circuit. 1 ... microcomputer, 9 ... timer device, 13 ...
… Strong electric load.

Claims (1)

(57) [Claims] An output circuit connected in series to a load to drive and control the load, a condition setting input unit for setting a driving condition of the load, and an on / off switch for the output circuit based on a driving condition of the condition setting input unit. And a control unit for controlling the control unit, wherein the control unit sets a start time to start driving the load at a desired time. The reservation timer is driven independently from the control unit, and is turned on when the start time is reached by the reservation timer. A timer switch connected to the output circuit, and a predetermined time timer provided in the control unit for measuring a predetermined time after setting a start time of the reservation timer, wherein the control unit is configured such that the predetermined time timer is Industrial equipment wherein the output circuit is not driven even if the timer switch is turned on until a predetermined time is measured.