JPS6037604Y2 - Controller station setting device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a setting device.

As shown in FIG. 1, the control device for keeping the controlled object of the process system at the target value is a central control system consisting of an analog/digital converter 11, a data transmission device 12, an electronic computer 13, and a digital display 14. A controller/station consisting of an input section 17 that receives the outputs of a processing device 10 and a detector 16 that detects a controlled object, an analog display 18, a backup/hold circuit 19, and an output section 21 that outputs an operation signal to an operation end 20. The electronic computer 13 controls the controller station 15 so that the controlled object reaches the target value.

The device for setting the state of target values, etc. in such a device is designed so that setting operations can be performed from both the central processing unit 10 and the controller station 15, and the set values are displayed on both displays 14 and 18. A circuit as shown in FIG. 2 is used.

That is, the circuit includes an up pushbutton switch 30 for increasing the set value, a down pushbutton switch 31 for decreasing the set value, and a down pushbutton switch being pressed while the up pushbutton switch is pressed. a logic circuit 32 which outputs a logic "1" when the button is not pressed, and a logic "0" when the push button switch for up is not pressed and the push button switch for down is pressed; a double push button switch 30; A prohibition circuit that produces an output of logic "°1" when both pushbutton switches 30 and 31 are pressed or not, and an output of logic "O" when only one of both pushbutton switches 30 and 31 is pressed. 33. The clock terminal CL is connected to the output side of a clock signal generator (not shown), the preset input side is connected to the central processing unit, the up/down selection input terminal is connected to the output side of the logic circuit 32, and the counting operation start input terminal is connected to the output side of the clock signal generator (not shown). A presettable up/down counter 34 is connected to the output side of the inhibition circuit 33, and a digital/down counter whose input is the output of the presettable up/down counter 34.
Analog converter 35, digital/analog converter 35
The buffer amplifier 37 amplifies the output of the central processing unit and outputs it to the analog/digital converter 11 of the central processing unit, the indicator 36, and the operating end 20 that controls the controlled object, and the pointer is located below the target value. If there is, press the up pushbutton switch.

By doing so, "1" appears on the output side of the logic circuit 32 and "099" appears on the output side of the inhibit circuit 33 at the same time, the clock signal is added to the count value of the presettable up/down counter 34, and the indicator 36 pointers move in the direction of the target value.

If the up pushbutton switch 30 is released when the target position is reached, the movement of the pointer will stop and a new set value will be set.

In addition, when the pointer is located above the target value, when the down pushbutton switch is pressed, "0" appears on the output side of the logic circuit, and the count value of the presettable up/down counter 34 changes. As the clock signal decreases, the pointer of the indicator 36 decreases, and when the target value is reached, the down pushbutton switch is released and the set value is changed to a new one.

By the way, since the electronic computer 13 controls the controller/station 15 so that the detection signal matches the target value, the output of the presettable up/down counter 34 of the controller station or the buffer amplifier 37 which always becomes the set value It is necessary to understand the output of

That is, this is because the central processing unit cannot predict when the control target value will be changed on the controller station side.

Therefore, conventionally, the control target value is sent back to the analog/digital converter 11 of the central processing unit 10 every control cycle.

However, in reality, the control target is often changed before startup and is not changed much after that, so it is difficult to constantly return the control target value to the central processing unit every control cycle.
This complicates the data transmission between the central processing unit 10 and the controller station 15 and unnecessarily lengthens the processing time required for the return.

That is, it has the disadvantage that the processing time is relatively long.

The outline of the purpose of this invention is to create a signal to reliably notify that the status has changed when the status has changed at the controller station, and to read the status of the controller station at each control cycle using that signal. An object of the present invention is to provide a setting device that is configured so that a central processing unit can read the status of control target values and the like of a controller station, simplifying data transmission and shortening processing time. be.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. 3, with the same numbers assigned to parts having the same function as the circuit or device shown in FIG. 2, and the explanation thereof omitted. A first logic that takes the logical sum of logic "1" that occurs only when the switch 30 is pressed and logic 6 & 199 that occurs only when the down pushbutton switch 31 is pressed, and outputs a logic "1" signal when the logic is satisfied. The sum circuit 40, the inversion circuit 41 that inverts the output of the first OR circuit 40, and the inverted signal of the control signal for reading the state sent from the central processing unit 10 every control cycle to the reset terminal R. A flip-flop circuit 42 connects the inverted signal of the output of the OR circuit 40 to the set terminal S, and the output of the OR circuit 40 and the flip-flop circuit 42
and the output of the non-inverting output terminal Q, and when it is established, the second OR circuit 4 outputs a logic 141 tt times signal.
3 is added to the circuit configuration shown in FIG.

In explaining the operation of the newly added circuit configuration with reference to FIG.
2 will be explained assuming that it is inverted at the trailing edge of the set and reset signals.

When changing the set value, the up pushbutton switch 30 or the down pushbutton switch 31 is always pressed.

Therefore, when changing the set value, a logic "1" level signal as shown in FIG. 4a appears only as long as it is pressed.

Further, even while the pushbutton switch is pressed, an inverted signal of the control signal (FIG. 4C) is applied from the central processing unit 10 to the reset terminal R of the flip-flop circuit 42 at a relatively fast cycle. There is.

Therefore, the flip-flop circuit 42 is set when the pushbutton switch 30, 31 is released from the output of the inversion circuit 41 (FIG. 4b) and the inversion signal of the control signal, and then the control signal (FIG. 4C) is inverted. The signal is reset and a signal as shown in FIG. 4d appears at the non-inverting output Q.

The output of the first OR circuit 40 and the flip-flop circuit 4
From the second OR circuit 43 which calculates the logical sum with the output of 2 (FIG. 4 d), a signal which becomes logical ``1'' only while the push button shown in FIG. 4 e is operated is sent to the central processing. The data is sent to the equipment side, making it possible to notify the central processing unit that there has been a change in the setting value of the controller station.

By the way, since the transmission of the setting change signal and the reading by the central processing unit is generally asynchronous, there are cases where the setting value is changed by operating the pushbutton switch at a time when no transmission is being performed, and the setting value may be changed at a time when the setting change signal is not being transmitted. There are cases where the set value is changed by holding down the pushbutton switch for a period of time, and even in these cases, it is required to reliably detect that the set value has changed, and the flip-flop circuit 42 is used for this purpose.

The output of the first OR circuit 40 and the flip-flop circuit 42
When a logical "1" signal is output from the second logical sum circuit 43 which calculates the logical sum with the output of the non-inverting output terminal Q of transmitted to device 10.

Each time the setting change signal is received, the central processing unit 10
takes the timing of the control cycle signal, reads the set value of the controller station, updates the memory contents of the memory element that stores the set value (Fig. 4 f), and grasps the current target value of the controller station. .

The fact that the setting has been changed by manipulating the target value of the controller station is reliably transmitted to the central processing unit. It is now possible to eliminate the need to read into the storage element of

The present invention described in detail above detects the operation of the up pushbutton switch to increase the set value or the down pushbutton switch operation to decrease the set value, and adjusts the target value of the controller station. The settings have been changed so that the central processing unit reads the setting value of the controller station whose target value has been changed from that signal and the control signal that periodically controls the controller station. Since the configuration is such that the central processing unit reads the status only when the controller station is in use, it is different from the conventional system in which the central processing unit reads the status of the target value of the controller station every time a control signal is generated, regardless of whether there is a setting change or not. Compared to the device of
In this application, the central processing unit reads the changed target value only when there is a change in the target value of the controller station, and the time required to read the target value of the controller station that is not changed is shortened, thereby reducing the processing time. Improvement in shortening can be expected.

Furthermore, data transmission could be simplified since the target value of the controller station, which is not changed, is not read.

In one embodiment of the present application, the setting value change of the controller station is described, but this is not limited to this, and there may be cases where the central processing unit wants to confirm the operation of the switch of the controller station. Of course, it is desirable to be able to read the information of

[Brief explanation of drawings]

FIG. 1 is a diagram showing a control device in block configuration, FIG. 2 is a diagram schematically showing an electric circuit of a conventional setting device, and FIG. 3 is a diagram schematically showing an electric circuit of a setting device of the present invention. , 4th
The figure is a diagram showing waveforms of various parts of the setting device of FIG. 3. 30...Push button switch for up, 31...
...Push button switch for down, 34...
Brissettable up-down counter, 40, 43...
...OR circuit, 41...Inversion circuit, 42.
...Flip-flop circuit.

Claims (1)

[Scope of utility model registration request] A central processing unit that has a switch and controls a plurality of controller stations whose set values can be changed by the switch, and reads the set values of each controller station, wherein the controller station has the switch. a flip-flop circuit that is set by the output of the setting change content of the detection circuit and reset by the control signal; and a flip-flop circuit that detects the output of the set value change content and the flip-flop circuit - The output side of the logical sum circuit of the controller station, which is equipped with a logical sum circuit that outputs a signal every time the logical sum of the set output of the flop circuit is established, and the central processing unit reads the state in synchronization with a predetermined control cycle. Only when a setting change signal is generated in
A controller station setting device, characterized in that it reads a setting value of the controller station.