JP3196482B2 - Input device for control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input device for a control device such as a programmable controller having a control operation means at the center of control.

[0002]

2. Description of the Related Art A control device having a control operation means at the center of control has come to be used in various fields such as industrial and consumer applications. In particular, a programmable controller (hereinafter abbreviated as PC) used for sequence control is It has become widely used in large control systems.

FIG. 6 shows an example of a system using a PC as an example of use of a control operation device having control operation means. FIG. 6A is a diagram schematically showing a control system using one PC. In the figure, C1 is a switch, C2 is a contact of a relay, C3 is a contact of a limit switch, and S1 is a sensor, which sends a signal of a logical value 0 or 1 of an open / close signal or a voltage signal. M1 and M2 are electric motors, and V1 is a solenoid valve.
Reference numeral 2 denotes a PC. The PC 2 receives a large number of signals such as an open / close signal of the switch C1 and the like and a signal of the sensor S1 and executes a sequence control program stored in the PC 2 as control data using these signals. Thus, a large number of loads such as the external motor M1 and the solenoid valve V1 are controlled. FIG. 6B shows a configuration example of a large-scale system using a PC, where 101 is a PC, and PC 101 is a switch.
A large number of signals, such as the open / close signal of C1 and the signal of sensor S1,
Input is performed via a plurality of input-only devices 3, and more loads such as the motor M 1 and the solenoid valve V 1 are controlled via the output-only device 4. Larger systems may incorporate a control system as described above as a number of components.

The reliability of the switch C1, the relay C2, the limit switch C3, etc. that emits the open / close signal described in the above example is extremely high when these devices are viewed alone. However, an input device having a mechanically movable mechanism such as a switch, a relay, or a limit switch has a life that depends on the number of times of opening and closing, and as the life approaches, reliability is inevitably reduced.

In the case of a small-scale system, even if a problem occurs in the input device at the time of occurrence of the problem with the reliability of the input device as described above, it takes a long time to generate the problem, and the frequency of occurrence of the problem is long. And there is little, so it is usually hardly a problem. However, as a result of advances in PCs, large-scale systems can be constructed, and the number of input devices used in the systems has reached thousands and tens of thousands. Since the reliability of the device decreases almost in proportion to the number of input devices used, measures for the life of the input device have become indispensable in maintaining the reliability of the system. Therefore, as a countermeasure, for input devices that have a long service life, the life of the input device is estimated from the results of experiments and actual use in accordance with the type of input device, and a new product is expected before the life is estimated to be reached. A replacement has been made.

[0006]

As described above, input devices used in control systems that have a life that depends on the operation frequency are statistically considered as described above.
By replacing the device with a new one before the end of its life, it has been prevented that a failure actually occurs. However, as the system becomes huge, it is almost impossible to estimate the frequency of use of each input device and manage it by estimating the end of its life. There was also a waste of replacement when it came off.

An object of the present invention is to automatically count the number of operations of an input device having a life that depends on the operation frequency, predict the life of the input device, and maintain the reliability of the system. Another object of the present invention is to provide an input device for a control device which can eliminate waste caused by the replacement of a product having a life described above.

[0008]

According to the present invention, in order to achieve the above object, according to the present invention, a binary logical value signal is inputted from the outside, and a voltage signal corresponding to the binary value of the binary logical signal is generated. An input device comprising an input circuit for generating and outputting this voltage signal to an external control operation device, wherein the input device includes a first counter, a first circuit opening / closing unit, and a second circuit opening / closing unit,
The first counter is connected to receive a pulse generated by the voltage signal output from the input circuit, integrate the number of pulses, and input the integrated value to the second circuit opening / closing means. An input control signal for inputting an external signal from the control arithmetic device is input, and a signal input to the input circuit is output to the control arithmetic device via the first circuit opening / closing means. The signal input to the second circuit opening / closing means is blocked by the second circuit opening / closing means, and when the output of the first counter is read out, the counter reading signal from the control arithmetic unit is inputted and the first circuit opening / closing means is inputted. Is characterized by blocking a signal reaching the control operation device via this means, and the second circuit opening / closing means outputting a signal input from the first counter to the control operation device.

A register and a selector are provided. The register receives selection data from the control arithmetic unit and stores the selection data. The selector transmits the selection data stored in the register to one terminal of the selector. The selector selects one of a plurality of signals input from the other terminal of the selector according to the selection data, outputs the selected signal to the output terminal of the selector, and outputs the signal from the output terminal of the selector. The voltage pulse signal generated by the
It is preferable to adopt a configuration in which the data is input to the counter. Further, a second counter is provided in place of the register, and the second counter is provided.
The counter outputs a numerical value stored in the counter, the numerical value output from the counter is connected to a terminal for inputting selection data of the selector, and the second counter outputs a numerical value stored in the counter from the control arithmetic unit. When the data is input as an initial value, it is preferable that the data is stored, a count pulse signal is input from the control arithmetic unit, and 1 is added or subtracted from the number stored in the second counter.

[0010]

When a binary logical value signal transmitted from an external device, for example, an open / close signal of a contact transmitted from a switch or the like is input to an input circuit, the input circuit responds to a voltage pulse signal, for example, an open state of the open / close signal. And outputs a signal at a voltage L level for a closed state.

When a normal external signal is input, the first circuit opening / closing means is controlled by a control signal from an external control arithmetic unit so that the signal passes therethrough. The data is input to the control arithmetic unit via the opening / closing means. On the other hand, since the external signal passing through the input circuit is a signal in which the L level and the H level of the voltage signal appear alternately, a pulse signal is formed, and this pulse signal is inputted to the first counter, and the number of pulses becomes the first pulse. It is counted by a counter. The number counted by the first counter is output from the first counter and input to the second circuit opening / closing means. The second circuit opening / closing means is controlled by a control signal from the control operation device.
The output signal from the first counter is not passed.

When a signal for reading the output of the first counter is output from the control arithmetic unit, this signal is input to the first switching circuit, and the first circuit switching means is in a high impedance state, and is input from the input circuit. Do not allow the signal to pass. On the other hand, the second opening / closing means is in a state of passing the signal input from the first timer. The control arithmetic unit reads the output of the first counter output through the second opening / closing means, and can know the number of operations of the external device up to that point, for example, the number of times of opening / closing of the contact.

When a register and a selector are additionally provided, first, selection data is set in the register in advance by the control arithmetic unit. The selection data stored in this register is output from the register and input to one terminal of the selector. The selector selects an input signal of a number corresponding to the numerical value of the input selection data from a plurality of input signals input to the other terminal of the selector,
Output. The signal output from the selector is accumulated in the first counter as a pulse voltage signal in the same manner as described above, and the accumulated value is read by the control operation device by the first counter read signal of the control operation device.

When a second counter and a selector are added, the numerical value stored in the second counter is output to the selector, and the selector selects an input signal having the numerical value input from the second counter as a number. Output. While the second
The selection data is set in the counter in advance by the control arithmetic unit. Further, when the count pulse signal is input from the control arithmetic unit to the second counter, the second counter adds or subtracts 1 to or from the stored number. In this way, the pulse voltage signals input to the first counter via the selector are sequentially switched.

[0015]

【Example】

(Embodiment 1) FIG. 1 shows an embodiment of an input device according to the present invention and a block diagram of a main part of a control device equipped with the input device. In the figure, IP1 is an input device, 2 is a control operation device, and 7 is a data bus.

The input device IP1 includes a first counter 1, an input circuit 3, a buffer 4, a bus driver 5 as a second circuit switching means, a three-state buffer 6 as a first circuit switching means, an AND logic element 81, Consists of 82. The counter 1 is a circuit element for adding 1 to the number stored in the counter 1 for each rising of the pulse signal input to the terminal CP, that is, a circuit element for counting the number of pulses input to the input terminal CP. Yes, the number stored by the counter 1 depends on the terminals Q1 to Q1.
Output to Qn in binary code. When the signal H level is input to the terminal CL, the number stored in the counter 1 is cleared to zero.

The configuration of the control arithmetic unit 2 will be described with reference to FIG. In the figure, 2 is the same as the control arithmetic unit 2 of FIG. 1, and the control arithmetic unit 2 includes a control arithmetic unit 20 and a storage unit.
21, input / output circuits 22 and 23, and input / output display means 24. The storage means 21 stores a program executed by the control arithmetic means 20 and data related to the execution of the program. The input / output circuit 22 is connected to the external data bus 7 and relays signals between the control arithmetic unit 2 and the outside. I / O circuit
23 is a terminal CSi (i represents one of a plurality of signals) for outputting a signal for selecting a circuit element connected to the outside of the control operation device 2 in accordance with a program executed by the control operation means 20; It has a terminal RD for outputting a signal giving a time point for reading an external signal, a terminal WR for outputting a signal giving a time point for outputting a signal to the outside, and a terminal Ro for outputting a timer clear signal. The input display means 24 is a device for inputting an operation signal from the outside and displaying the contents of the storage means 21 and the data of the control calculation means 20 according to a program executed by the control calculation means 20. AB is an internal bus for transmitting address signals and control signals output from the control operation means 20, and DB is an internal data bus for transmitting data transmitted and received between the units constituting the control operation device 2.

Referring again to FIG. 1, the control arithmetic unit 2 receives signals from external switches and relays (not shown), converts these signals into control data, and stores the data inside the control arithmetic unit 2. This is a device for transmitting a signal for controlling loads such as an external electric motor and a solenoid valve via the data bus 7 by executing the control program. The figure shows one circuit of a circuit for inputting a contact signal from the outside.

The input of the external contact signal to the control arithmetic unit 2 is performed as follows. External contact signals such as switches and relays (not shown) are input to the input circuit 3 and the input circuit 3
When the contact signal is an open signal, the voltage is converted to an L level voltage close to 0 volt, and when the contact signal is a close signal, it is converted to an H level voltage close to the DC power supply voltage, and output from the input circuit 3. You. The output current of the output signal is amplified by the buffer 4 and input to the three-state buffer 6 and the counter 1 as a signal Di1. When the control arithmetic unit 2 executes the command to input an external signal, it sets the voltage of the output signal terminal CS1 to the H level,
In addition, the voltage of the output terminal RD is set to the H level. As a result, the output signal Cs1o of the AND logic element 81 becomes H level, and this signal is input to the control signal terminal En6 of the three-state buffer 6 as the first circuit opening / closing means, and the three-state buffer 6 functions as a buffer. , The signal Di1 is amplified and read into the control arithmetic unit 2 via the data line 71 forming the data bus 7.

On the other hand, the counter 1 outputs a timer clear signal Ro output from the control arithmetic unit 2 when the system is started, to a terminal CL.
And the number stored therein is cleared to zero. signal
When Di1 is input to the terminal CP of the counter, each time the signal rises, the counter 1 increments the number stored therein by one.
Is added. Each time the external contact signal repeatedly opens and closes once, the signal Di1 rises from L level to H level by one.
Since the pulse signal appears twice, the start time of the system is set to count 0, the number of times the external contact is opened and closed is counted, and the binary signal is output to the terminals Q1 to Qn. The signals output to the terminals Q1 to Qn are input to the bus driver 5 as the second circuit opening / closing means.
Since 5 is at L level, the three-state buffers 51, 52 to 5n constituting the bus driver 5 become high impedance, and the signal input to the bus driver 5 is cut off by the bus driver 5 and is not output.

When a signal from which the output of the counter 1 is to be read is input to the control arithmetic device 2, that is, when a switching signal number read signal is input, the control arithmetic device 2 executes an instruction to read the signal of the counter 1. Thereby, the output of the terminal CS1 is set to L level, the output of the terminal CS2 is set to H level, and the signal of the terminal RD is set to H level. As a result, the output signal Cs1o of the AND logic element 81 becomes L level, the control signal En6 to the three-state buffer 6 becomes L level, and the three-state buffer 6 becomes high impedance. Will be shut off. On the other hand, the output signal Cs2o of the AND logic element 82 goes high, and this signal is the control signal En of the three-state buffer 5.
5, the three-state buffer 5 operates as a normal buffer, and the output of the counter 1 is output to the data bus 7 connected to the control operation device 2 via the three-state buffer 5, and is output by the control operation device 2. Is read. The output data of the counter 1 read by the control arithmetic unit 2, that is, the data representing the number of times of opening and closing of the external contact, is executed by the control arithmetic unit 2 executing a display program, and the input / output display means provided in the control arithmetic unit 2
24 (see FIG. 2). As a result of the above, the content of the displayed counter 1 indicates the number of times the external contact signal has been opened and closed since the start of the system. (Embodiment 2) FIG. 3 is a block diagram showing another embodiment of the input device according to the present invention and a main part of a control device equipped with the input device. In the figure, IP2 is an input device, 2 is a control operation device, and 7 is a data bus. The control operation device 2 and the data bus 7 are the same as those described with reference to FIG. The input device IP2 includes a selector 10, a register 11, a first counter 1, an input circuit 31, buffers 41 to 4n, a bus driver 5 as a second circuit switch, a three-state buffer 61 to 6n as a first circuit switch, AND logic element 81, 82, 83
The same components as those in the embodiment described with reference to FIG. 1 are denoted by the same reference numerals.

The register 11 stores the data Ds1 to Dsn when the signal input to the terminal En11 becomes H level while the data Ds1 to Dsn via the data bus 7 is input, and stores the stored data in the terminals Do1 to Dos. The selector 10 receives signals output from the terminals Do1 to Don of the register 11 and uses the number represented by the data as selection data to select a plurality of signals input to the other terminals of the selector. This is a circuit element that selects an input signal having a number represented by the number represented by the selected data from among the signals Di1 to Din, and outputs the selected signal to a terminal Do.

The control arithmetic unit 2 previously selects the selection data Ds1 to
Dsn is output and terminal Cs3 and terminal WR are set to H level. As a result, the output signal Cs3o of the AND logic element 83 becomes H level, this signal is input to the terminal En11 of the register 11, the selection data DS1 to Dsn input to the register 11 are stored in the register 11, and Output to Do1 to Don. Data output from the terminals Do1 to Don is input to the selector 10, and one of the signals Di1 to Din input to the selector 10 is selected according to the number represented by the data, and
Output to the 10 output terminal Do.

An external contact signal is supplied to the input circuit 31 by the input circuit 31.
A signal indicating the opening and closing of the contact is converted as a signal corresponding to the L level and the H level of the voltage, and the current is amplified by the buffers 41 to 4n and input to the selector 10 as signals Di1 to Din. The selector 10 receives the signals of the output terminals Do1 to Don of the register 11 and uses these signals as selection signals to generate signals Di1 to Di.
Select one of n signals and output to the output terminal Do. The counter 1 receives the signal from the output terminal Do of the selector at the terminal CP, and performs the same operation as in the first embodiment.
The open / close signal represented by the signal from Do is counted. As described above, the present embodiment selects and counts one signal designated in advance from among a plurality of opening / closing signals, receives the opening / closing signal read signal from the control arithmetic unit, Is displayed. For display,
This is performed in the same manner as in the first embodiment. (Embodiment 3) FIG. 4 is a block diagram showing another embodiment of the input device according to the present invention and a main part of a control device equipped with the input device. In the figure, IP3 is an input device, 112 is a control operation device, and 7 is a data bus. The input device IP3 includes a selector 10, a second counter 12, a first counter 1, and an input circuit 3.
1. Buffers 41 to 4n, bus driver 5 as second circuit switching means, three-state buffers 61 to 6n as first circuit switching means, AND logic elements 81, 82, and 83. Except for the incorporation, the same components as those of the embodiment described with reference to FIG.

Referring to FIG. 5, the configuration of the control arithmetic unit 112 of this embodiment will be described. In the figure, reference numeral 20 denotes a control operation means, 21 denotes a control operation means, 22 and 123 denote input / output circuits, and 25 denotes a timer, which have the same reference numerals and names as those constituting the control operation device described with reference to FIG. Are the same. Also storage means
In FIG. 5, as shown in FIG. 5B, a storage area for storing the number of pulses generated by a plurality of external input signals is prepared in accordance with the numbers of a plurality of external input signals. The timer 25 receives the set time from the control calculation means 20 and starts upon receiving a signal to start time measurement. When the set time has elapsed, the timer 25 sends a signal to the control calculation means 20 indicating that the time measurement has ended. Control calculation means 20
When this signal is input, the terminal CS of the input / output circuit 123
2 (Terminal 2 among a plurality of terminals indicated as CSi in the figure) and RD are set to H level.

Returning to FIG. The second counter 12 stores the data input via the data bus 7 when the signal to the terminal Set becomes H level, and outputs the data to the terminals Qs1 to Qsn. Thereafter, the signal input to the terminal C changes from the L level to the H level.
Each time the level rises, 1 is added to the stored data, and the result is output to terminals Qs1 to Qsn. The counting of the open / close signal of the input device of this embodiment and the control device equipped with this device is performed as follows. First, when the system is started, the control arithmetic unit 112 sets the initial set value Ds of the second counter 12 to Ds.
1 to Dsn are output, and the output signals of the terminals CS2 and WR are set to the H level. The signals from terminal CS2 and terminal WR are
83, the output Cs30 of the logic element 83 goes high, and this signal is input to the terminal Set of the timer 12,
The counter 12 is set to initial values Ds1 to Dsn that have been input in advance.

An external contact signal is supplied to the input circuit 31 by the input circuit 31.
A signal indicating the opening and closing of the contact is converted as a signal corresponding to the L level and the H level of the voltage, and the current is amplified by the buffers 41 to 4n and input to the selector 10 as signals Di1 to Din. The selector 10 is connected to the output terminals Qs1 to Qsn of the second counter 12.
And the signal Di1 as a selection signal.
DDin is selected and output to the terminal Do. The first counter 1 receives the signal Dij output from the terminal Do of the selector, and counts the open / close signal represented by the signal Dij in the same manner as in the first embodiment. On the other hand, the timer 25 (FIG. 5) in the control arithmetic unit 112 sends a signal for ending the time measurement to the control arithmetic means 20 (FIG. 5) when the measured time reaches the set time. Upon input of the time measurement end signal, the control calculation means 20 performs the first
The contents of the counter 1 are inputted, and this numerical value is stored in the storage means 21.
The data is added to the data in the storage area of the number corresponding to the currently selected signal Dij in FIG. 5 and the addition result is stored in the same area. Subsequently, the output of the terminal Ro is set to the H level, and the content of the first counter 1 is cleared to 0. Continuing on, the arithmetic unit 11
Step 2 clears the content of the timer 25 in the control device 112 to 0, sets the same set time as before to the timer 25, and starts measuring the time. Furthermore, a pulse is output once to the terminal Co, and this signal is input to the terminal C of the second counter 12, and the number stored in the counter 12 is obtained by adding 1 to the number stored in the past. Update to When the number stored in the second counter 12 increases by one, the selection data Qs1 to Qsn input to the selector 10 increases by one, so that the signal Dij + 1 of the next number to the signal Dij is output to the terminal Do of the selector 10. The number of contacts opened and closed represented by this signal is counted by the counter 1 as new data.

The timer 25 in the control arithmetic unit 112 completes the measurement of the set time again, and performs the same operation as described above. As a result, the currently selected signal Dij + 1 in the storage means 21 is obtained.
Is added to the data in the storage area having the number corresponding to. Hereinafter, since the number stored in the second counter 12 is incremented by one, the signal with the next highest number among the signals Di1 to Din input to the selector 10 is selected and corresponds to this number. The number of times the signal is opened and closed is counted and added to the storage area of each number.
When the second counter 12 finishes counting up to the maximum number that can be counted, it is set again to the first number Ds1 to Dsn, and the input device IP3
Repeats the same operation (the number of repetitions is referred to as a cycle in the following description).

When the signals Di1 to Din are input for a long time and the number of cycles described above reaches a large number, the individual signals
Since the measurement period of the number of times of opening and closing Dij is set to be equal for all signals, the measurement period for one signal is a period obtained by dividing the entire measurement period by the number of signals. Therefore, the number of times that one signal Dij is stochastically approximated is, assuming that the total number of signals is n, the control arithmetic unit 112
Dij in the opening / closing signal storage area 21d (FIG. 5) of the storage means 21 of FIG.
It becomes n times the numerical value accumulated in the area of the number. Signal Dij
When a signal for indicating the number of times of opening and closing is input to the control arithmetic unit 112, the control arithmetic means 20 executes the display program, and the numerical value accumulated in the area No. Dij in the open / close signal storage area 21d. Is multiplied by the number of signals and displayed. The signal to display the number of times of opening and closing of all signals is the control arithmetic unit 11
2 is input to the control operation means, the open / close signal storage area 21
The data in d is sequentially displayed by multiplying the number of signals, and the data near the limit of the predetermined number of times of opening and closing is displayed with a mark added.

[0030]

As described above, according to the present invention, a binary logic value signal is input from the outside, a voltage signal corresponding to the binary value of the binary logic signal is generated, and this voltage signal is converted to an external signal. An input device comprising an input circuit for outputting to a control operation device, a first counter, a first circuit opening / closing means, and a second circuit opening / closing means, wherein the first counter is a voltage signal output from the input circuit. Are connected so as to input the pulses produced by (1) and (2) to accumulate the number of pulses, and to input the integrated value to the second circuit opening / closing means, and to input an external signal from the control arithmetic unit when an external signal is input. Input control signal is input, and the signal input to the input circuit is
When the output from the first counter is output to the control arithmetic unit via the first circuit opening / closing means and the signal input from the first counter to the second circuit opening / closing means is blocked by the second circuit opening / closing means, and the output of the first counter is read Receives a counter read signal from the control operation device, the first circuit opening / closing means blocks a signal reaching the control operation device via this means, and the second circuit opening / closing means receives an input from the first counter. Is output to the control arithmetic unit.

According to the input device of the present invention, as described above, the number of times of opening / closing and the integrated value of the number of times of operation of a device that transmits a binary signal such as an opening / closing signal can be easily known as necessary. Therefore, even in a system having hundreds or thousands of devices, such as switches, relays, and sensors, it is possible to detect in advance and easily the time when the reliability of the system is reduced due to the approaching life of the devices constituting the system. The reliability of the system can be ensured by replacing the equipment whose life is approaching. Therefore, it is possible to eliminate wasteful replacement of a device that can be sufficiently used by disposing of the device depending on the possibility, and to maintain the reliability of the system.

In the control device according to the present invention having the selector and the register, the numerical value stored in the register is given to the selector, and the external signal selected by the selector is counted. There is an effect that a circuit can be covered by a counting circuit for one circuit. In the input device according to the present invention having a counter in place of the above-described register, a plurality of input signals input by the counter are sequentially switched and input at fixed time intervals, and the count value of each signal is integrated. Therefore, there is an effect that counting of a large number of signals can be performed simultaneously in parallel.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an input device according to the present invention;

FIG. 2 is a block diagram of a control arithmetic unit shown in a block diagram showing an embodiment of the input device according to the first aspect of the present invention;

FIG. 3 is a block diagram showing one embodiment of an input device according to the invention described in claim 2;

FIG. 4 is a block diagram showing an embodiment of the input device according to the invention described in claim 3;

FIG. 5 is a diagram for explaining a control arithmetic unit shown in a block diagram showing an embodiment of the input device according to the third aspect of the present invention, wherein (a) is a block diagram of the control arithmetic unit;
(b) is an explanatory diagram of an integrated value storage area provided in the storage means in the control arithmetic device.

6A and 6B are explanatory diagrams of a system including a programmable controller, in which FIG. 6A is a system configuration diagram in which one programmable controller is used as a control center, and FIG. 6B is a diagram including one programmable controller and peripheral input / output devices; System Configuration

[Explanation of symbols]

IP1, IP2, IP3 Input device 1 First counter 12 Second counter 11 Register 2, 112 Control operation device 3 Input circuit 4 Buffer 5 Bus driver 51, 52, 5n as second circuit opening / closing means Constructs second circuit opening / closing means 6 three-state buffer 61,62,6n as first circuit switching means 3 three-state buffer 7 as first circuit switching means 7 data bus 81,82,83 AND logic element

Claims (3)

(57) [Claims] 1. A binary logic value signal is inputted from the outside,
Generating a voltage signal corresponding to the binary value of the binary logic signal,
An input device comprising an input circuit for outputting this voltage signal to an external control operation device, comprising: a first counter, a first circuit opening / closing unit, and a second circuit opening / closing unit; A pulse generated by the voltage signal output from the circuit is input, the number of pulses is integrated, and the integrated value is connected to the second circuit opening / closing means. When the external signal is input, the control operation is performed. An input control signal for inputting an external signal from the device is input, and a signal input to the input circuit is output to the control arithmetic device via the first circuit opening / closing means, and the first A signal input from the counter to the second circuit opening / closing means is blocked by the second circuit opening / closing means, and when the output of the first counter is read, the counter from the control arithmetic unit is read. When the first circuit opening / closing means receives the data read signal, the first circuit opening / closing means blocks a signal reaching the control arithmetic unit via this means, and the second circuit opening / closing means receives the signal input from the first counter. An input device for a control device, wherein the input device outputs the signal to the control arithmetic device. 2. The input device according to claim 1, further comprising a register and a selector, wherein said register receives selection data from a control operation device and stores the selection data, and said selector stores said selection data. The selection data stored in the register is input from one terminal of the selector, and one of a plurality of signals input from the other terminal of the selector is selected based on the selection data, and An input device for a control device, wherein a voltage pulse signal output from an output terminal and generated by a signal output from an output terminal of the selector is input to a first counter. 3. The input device according to claim 2, wherein a second counter is provided in place of the register, and said second counter outputs a numerical value stored by said counter, and a numerical value output by said counter is The second counter is connected to a terminal for inputting selection data of a selector, and the second counter stores the data stored in the counter when the numerical value stored in the counter is input with selection data from the control arithmetic device as an initial value. An input device for a control device, which receives the count pulse signal from the controller and adds or subtracts 1 to the number stored in the second counter.