JPS6214799B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field to which the invention relates The present invention relates to a program timer that controls driving, stopping, etc. of a load based on a day of the week, time and output state programmed in advance.

(b) Conventional technology and its drawbacks Conventional program timers are used in manufacturing machines, chemical plants, etc. where processing conditions change due to a power outage, because when a power outage occurs, the program content corresponding to that time is executed as soon as the power is restored. When used for this purpose, inappropriate output was sometimes sent out when the power was restored. Therefore, when applying a conventional program timer to such devices, it is necessary to include a circuit that prohibits output transmission after power is restored, a power outage indication circuit,
Furthermore, it is necessary to incorporate a circuit etc. that is attached to these circuits and enables output to be sent out at any time.
The structure of the program timer becomes complicated, the device becomes larger, and the price becomes higher.

(c) Purpose of the Invention The purpose of the present invention is to provide a program timer which has a simple structure, is miniaturized, is low in cost, and can send an appropriate output based on the judgment of the operator when the power is restored after a power outage. It is about providing.

(d) Structure and Effects of the Invention The program timer according to the present invention includes a power recovery storage means for storing the power recovery state after a power outage, and a power recovery means for sending an output to a specific load whose time at power recovery matches the program time. and means for determining the storage contents of the power recovery storage means and the setting state of the instruction means after the power is restored. It is characterized by driving a specific load.

According to this invention, when the power is restored after a power outage, the program that stores the instructed time is executed only when output transmission is instructed. It is possible to determine an appropriate output according to the method, and it can be applied without problems to devices whose processing conditions change due to the occurrence of a power outage, and has an excellent general-purpose example. Furthermore, since there is no need to incorporate a circuit for inhibiting output transmission after the power is restored, the structure is low-cost and simple, and it also has the advantage of being compact.

(e) Description of Embodiments FIG. 1 is a block diagram of a program timer according to an embodiment of the present invention, FIG. 2A is a front view showing the front panel of the program timer, and FIG. 2B is a rear panel of the program timer. FIG.

The control section of this program timer is composed of a 4-bit one-chip C-MOS microprocessor. In FIG. 1, a clock pulse generation circuit 2 that provides a drive pulse and a time signal is connected to the CPU 1, and an interrupt signal generation circuit 3 that provides an interrupt signal to the CPU 1 at a predetermined period, for example, every 2.5 ms, is also connected. There is. keyboard 1
4 is arranged on the front panel as shown in FIG. 2A, and is used to input various program data such as numbers, days of the week, date and time, and channel numbers to the CPU 1. The "output" key 14a on the keyboard 14 is used to set output during programming, and is used to set output sending during execution. In other words, during execution, the "output" key 14a serves as an instruction means for instructing whether or not to send an output to a specific load whose time when the power is restored and the program time match.

The output of the CPU 1 is given to an output monitor 15 and a relay section 16 via a time display section 10, a day of the week display section 11, a setting output monitor 12, and an automatic-manual switching circuit 17. The time display section 10 is a four-digit number that displays the current time, channel number, on/off data, and program time when setting a program. The day of the week display section 11 displays 7 corresponding to each day of the week.
It is made up of several light-emitting elements and displays the current day of the week and the day of the week at the time of program setting, as well as indicating that the power has been restored by blinking all the light-emitting elements. Further, the setting output monitor 12 is a display device consisting of light emitting elements for four channels that displays the channel number set at the time of program setting. The weekly program switch 13 consists of seven switches arranged on the front panel corresponding to the light emitting elements of each day of the week in the day of the week display section 11. "Auto" setting state or "Off" indicating that load control of all channels is not performed.
It can be switched to the setting state. The automatic-manual switching circuit 17 consists of a switching switch provided for each channel to switch between "manual on", "automatic", and "manual off", and when each switching switch is set to "automatic", the channel The output of the CPU 1 is automatically applied to the load, and when it is set to "manual input", a relay circuit (not shown) connected to the subsequent stage is forcibly driven regardless of the output of the CPU 1. The relay unit 16 consists of four relays that operate or stop devices connected to this program timer, and is connected to the CPU 1 together with the output monitor 15 via an automatic-manual switching circuit 17.
The output monitor 15 is made up of light emitting elements arranged in parallel to each light emitting element of the set output monitor 12, and displays the operating state of each channel.

At the rear of the program timer, as shown in FIG. 2B, a mode selection switch 7 and an output terminal 18 connected to a load are provided. When mode selection switch 7 is turned on, when a power outage occurs,
A mode that turns off the output of each channel, flashes the entire day of the week display section 11 as an indication after the power is restored, and enables output transmission at any time after the power is restored. (referred to as return mode). On the other hand, when the mode selection switch 7 is turned off, the mode becomes a mode (hereinafter, this mode will be referred to as a simultaneous return mode) that enables output corresponding to the time to be sent out at the same time as the power is restored after a power outage. This simultaneous recovery mode is selected when this program timer is applied to equipment whose processing conditions do not change due to a power outage.

The power failure detection circuit 8 is connected between the main power supply and the CPU 1 and is a circuit for converting the main power supply to a predetermined detection level by resistive voltage division and guiding it to the CPU 1. When the main power supply is turned off, if the output level of the power failure detection circuit 8 is "L (low)", the CPU 1 detects that the main power supply is turned off, that is, a power outage has occurred. Upon detection of this power failure, the CPU 1 turns off each output port, performs processing to reduce power consumption during battery backup, and continues only the timekeeping operation. The main power is stabilized by the constant voltage circuit 5 and converted to a predetermined voltage, and then supplied to the CPU 1. A battery 6 connected to the output line of the constant voltage circuit 5 constitutes a backup power source in the event of a power outage, and supplies voltage to the CPU 1 to continue processing operations even when the main power source is "off."

The ROM 4 stores a control program for the CPU 1. The RAM 9 also includes a working area 9a containing an output buffer, an output sending flag area 9b which is set to ``1'' when the above-mentioned ``output'' key 14a is pressed during program execution and the output sending setting state is entered, and a power outage occurs. It has a power outage flag area 9c which is set to "1" when a power failure occurs, and a user's program area 9d which stores a user's program. For example, the user's program area 9d is
Consists of 25 steps of data store area. As shown in FIG. 3, the data for each step consists of program data such as channel, day of the week, time, and whether or not output is to be sent, which are stored at addresses n to n+4.

The power failure flag is turned on = "1" when the output level of the power failure detection circuit 8 is "L", and is reset to off = "0" when the power is restored in simultaneous recovery mode, and is reset to off = "0" in confirmation recovery mode. If the power is restored in , it will be reset only when the output sending flag turns on. As will be clear from the explanation of the operation described later, in this embodiment, the power failure flag also serves as a power recovery storage means.

Next, the operation of this program timer will be explained.

FIG. 4 is a flowchart showing the main routine of this program timer, and FIG. 5 is a flowchart showing the interrupt subroutine of the program timer.

As shown in FIG. 5, an interrupt subroutine consisting of each processing step from step n30 (hereinafter, step ni is simply referred to as ni) to n35 is executed for 2.5 ms by the interrupt signal given from the interrupt signal generation circuit 3 to the CPU 1. executed every time. First, at n30, the output level of the power outage detection circuit 8 is checked, and when the output level is "L", the power outage flag becomes "1", and the process moves on to time counting (n34, n35, n33). ). When there is no power outage, display processing, keyboard 14 search, and time counting processing are performed (n31 to n33).

In the main routine, as shown in FIG. 4, first, at n1, initial settings are performed to prevent the program time from being erroneously set and the program time and operation time to malfunction at the same time as the start of the operation. and,
If the time is counted in the interrupt subroutine at n2, the current time is updated, and further, at n3, it is determined whether one minute has elapsed.
If one minute has elapsed, a search is made for program data written in the user's program area 9d at n4, and data with matching day of the week and time is stored in the working area 9a (n5).
If before 1 minute has passed, jump to n12 described below,
Return to n2 again. The search process at n4 is performed on the program data of all steps (n6), and all program data matching the current day of the week and time are stored in the working area 9a at n5. Next, at n7, a check is made to see if a power outage has occurred. If there is a power outage, check the status of the power outage flag, and if the flag is "0", set this power outage flag to "1", turn off all output ports (n15 to n17), and then switch to n2. Jump. The purpose of turning off all output ports is to reduce power consumption during a power outage.

At n7, if there is no power outage, the process moves to n8, where it is determined by the mode selection switch 7 whether or not the simultaneous recovery mode is set. If the mode selection switch 7 is turned off and the simultaneous return mode is selected and set, proceed to n9. During normal times when there is no power outage, output processing is performed from n9 to n11.
When the power failure flag is "1" at n9, the power has been restored, so the power failure flag is reset at n10 and each display section is turned on. After this,
Based on the data stored in the working area 9a, output is sent to the outside (n11).

At n8, if the mode selection switch 7 is turned on and the confirmation recovery mode is selected and set, it is determined at n18 whether the power outage flag is set to "1". When there is no power outage, the power outage flag is "0", so the process moves to n11 and normal output processing is performed. Further, if the power outage flag is "1" at n18, the judgment point at n18 advances from n18 to n19. That is, at the stage n18, the power failure flag constitutes a power recovery storage means. Since it means that the power is restored, n19 is a step to determine whether the power restoration display is lit or not, but it is not displayed at the stage of transition from n7 → n8 → n18 → n19, so n19
→Proceed to n22. In n22, in order to notify the outside that the power has been restored, a power restoration state display circuit (not shown) is activated, and the day of the week display section 1
Press 1 to make the display blink and proceed to n12. This power recovery display allows the operator to recognize that the power has been restored after a power outage, and determines whether or not to send out or send out, taking into account the state of the load during the power outage and the duration of the power outage. When no key input operation is performed at n12, the process jumps to n2, and when a key operation other than output transmission is performed, the process moves to n13→n14, processes for that key operation, and jumps to n2. Also, if the "output" key is pressed and an instruction is given to send output when the power is restored, the process moves from n13 to n23 and the output sending flag becomes "1".
is set to n18. Below, n18
→n19→n20→n21, the output sending flag and power failure flag are reset, the power recovery display is turned off, the current day of the week is displayed on the day of the week display section 11, and then the program jumps to n11, where the output processing begins. It will be done. At this time, on n11, "output" key 1
The program at the time corresponding to the output sending instruction time when 4a was pressed is executed. In the above processing, n18 constitutes a step for determining whether or not the power supply is restored, and n20 constitutes a step for determining whether or not the output transmission setting state is established.

In this way, if the confirmation return mode is set, the output sending instruction will be sent to the "output" key 14 when the power is restored.
Since no output is sent to the load unless input by a, it is possible to prevent the program from being automatically executed as is after the power is restored. Therefore, when used in a chemical plant or the like where processing procedures change due to a power outage, it becomes possible to take appropriate measures at the discretion of the operator after a power outage. In addition, this embodiment has a configuration in which the power restoration state can be checked on the display, so there is an advantage that it is possible to quickly take action after the power is restored. Furthermore, it has the advantage of having a simple configuration without adding any external circuit means, being inexpensive, and capable of being miniaturized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a program timer according to an embodiment of the present invention, FIG. 2A is a front view showing the front panel of the program timer, FIG. 2B is a rear view showing the rear panel of the program timer, and FIG. The figure shows the memory contents of the user's program area of RAM 9 of the program timer, Figure 4 is a flowchart showing the main routine of the program timer, and Figure 5 is a flowchart showing the interrupt subroutine of the program timer. . 8... Power failure detection circuit, 9... RAM, 14... Keyboard, 14a... "Output" key (output sending instruction means).

Claims (1)

[Claims] 1. When the time is measured and the pre-programmed day of the week and time match the measured day of the week and time, drive the load corresponding to the matching program,
In the program timer that controls stop etc.
A power recovery storage means for storing a power restoration state after a power outage, an instruction means for instructing whether or not to send an output to a specific load whose time at power restoration coincides with a program time, and said power restoration storage means after power restoration. and a means for determining the stored contents of the instruction means and the setting state of the instruction means, and the program timer is configured to drive the specific load only when the output is set in the output sending setting state in the power supply recovery state.