JPS63244201A - Pulse width output controller - Google Patents

Abstract

PURPOSE:To execute a manual control by the same operation as that of the usual time, even when a microprocessor has become a fault, by providing a signal selecting circuit for selecting a pulse output from the microprocessor or a manual controller and outputting it to a final control elements. CONSTITUTION:When a microprocessor 1 is in a normal operation, a signal selecting circuit 3 selects a pulse output from the microprocessor 1 and outputs it to a final control element, a switch 6 is connected to a contact (a), and an indicator circuit 4 indicates the pulse output from the microprocessor 1. When the microprocessor 1 becomes a fault, the signal selecting circuit 3 selects a pulse output from a manual controller 2 and outputs it to the final control element, the switch 6 is connected to a contact (b), and the indicator circuit 4 indicates the pulse output of the manual controller. In such a way, even when the microprocessor has become a fault, the manual control can be executed by the same operation as that of the usual time, and a pulse width output controller whose operability is satisfactory can be realized.

Description

[Detailed Description of the Invention] (Industrial Application Field) What is the present invention? I! The present invention relates to a pulse width output controller suitable for controlling the operating end of a magnetic valve, etc.

(Prior Art) A pulse width output controller that outputs a pulse width signal as a speed type operation signal is used in a control system having an operating end that performs an integral operation such as a solenoid valve. In order to increase the flexibility of process control, this pulse width output controller is equipped with a microprocessor like the position type output adjustment needle, and is also provided with an indicator that indicates the direction of output to the operating end.

Conventional pulse width output controllers of this type use a microprocessor to calculate and output pulses and widths. In combination with a D/A converter, the indicator indicates the calculation output of the microprocessor during automatic adjustment, and the manual adjustment output applied to the microprocessor during manual adjustment.

(Problem to be Solved by the Invention) In the conventional pulse width utility iJ1 moderator configured as described above, if the microprocessor fails for the same reason, the indicator will stop indicating. Therefore, there is a problem that manual adjustment cannot be performed. In order to solve this problem, it is possible to install an indicator that is separate from the microprocessor, but the operation is different between normal manual adjustment and manual adjustment when the microprocessor fails. Therefore, a problem arises in that the operation is cumbersome.

The present invention was made in view of these problems, and its purpose is to enable manual adjustment of the pulse width by the same operation as in normal times (when the microprocessor is in a normal state) even if the microprocessor fails. This is an attempt to realize an output controller.

(Means for Solving the Problems) FIG. 1 is a basic configuration block diagram of the controller of the present invention.

In the figure, l inputs the process signal ei from the process and the set value signal ms, performs PI calculation, calculates the pulse width, and performs UP/D according to this pulse width.
A microprocessor that outputs an OWII pulse, 2 a microprocessor that outputs an UP/DOIfN pulse by manual operation, 3 a normal microprocessor 1,
@ Always select the output pulse from microprocessor 1 and the pulse output from microprocessor 2,
A signal selection circuit that outputs the selected pulse output to the control end;
4 is an indicator circuit including a signal holding circuit, 5 is a voltage generation circuit that outputs a voltage signal corresponding to the operation of the microprocessor 2, and 6 is a microcontroller that is output via a D/A converter when the microprocessor l is normal. A signal corresponding to the output pulse of the processor 1 is applied to the indicator circuit 4, and when the microprocessor 1 fails, the output signal of the voltage generating circuit 5 is applied to the indicator 0! This is a switch that applies voltage to the circuit 4.

(Function) When the microprocessor 1 is in normal operation, the signal selection circuit 3 selects the pulse output from the microprocessor 1 and outputs it to the operating terminal, the switch 6 is connected to the contact a, and the indicator circuit 4 selects the pulse output from the microprocessor 1 and outputs it to the operating end. Instructs pulse output from processor l. When the microprocessor I fails, the signal selection circuit 1s3 selects the pulse output from the microprocessor 2 and outputs it to the operating terminal, the switch 6 is connected to the contact, and the indicator circuit 4 selects the pulse output from the microprocessor 2 and outputs it to the operating terminal. Instruct.

(Embodiment) FIG. 2 is a configuration block diagram showing an embodiment of the present invention. In FIG. 2, the same parts as those in FIG. 1 are designated by the same reference numerals.

The microprocessor 1 inputs an A/D converted process signal ei, a set value signal es, a manual operation signal UP/DOWN from the microprocessor 2, and an A/M status signal for automatic adjustment 2. 0 microprocessor 2 has a manual operation switch 5 which outputs UP/DOWN signals. IFl, 512. It is configured to include an A/M changeover switch SA/M for switching between automatic G1 section and manual adjustment. The signal selection circuit 3 has a gate Gl that is open when the microprocessor I is in normal operation.

G4, the time when the microprocessor 1 fails, the gate G2. G5, each gate Gl, output of G2 and each gate)
G4. OR gate G3. which inputs the output of G5. It is made up of G6. The indicator circuit 4 includes a signal holding circuit 41. which holds the signal applied via the switch 6. It consists of a voltage-current conversion circuit 42 and an indicator 43. The voltage generation circuit 5 includes voltage dividing resistors R1, R2, and 6 that divide and extract the 6V voltage.
Resistor R3, OV that takes out the V voltage via switch Sl
It consists of a resistor R4 that takes out the voltage through a switch S2, the switch S1 being driven by the output of the gate G2,
Switch S2 is configured to be driven by the output of gate G5.

The operation of the apparatus configured in this way will be explained next.

At the time of automatic 11m, the microprocessor 1 calculates the deviation 6 from the process signal ei set value signal es, performs a PI calculation, performs a pulse width calculation, and uploads it.
/ Output as DOWN pulse. Also, during manual adjustment, the UP/0OWN signal from the microprocessor 2 is input, and this is output via the memory means.
The manual adjustment value is maintained and updated in preparation for switching the pan press from manual adjustment to automatic adjustment. While the microprocessor l is operating normally, whether during automatic adjustment or manual adjustment, a normal signal (NORMAL) indicating normality is output from the microprocessor l, and the signal selection circuit 3 11i1 from microprocessor 1 mentioned UP/00W! The l signal is output to an operating end (not shown). Further, the switch 6 is connected to a contact a, and the indicator 43 is instructed to output an operation corresponding to the output of the microprocessor l.

When the microprocessor l fails, a fail signal (FAIL) indicating the failure is output, and the signal selection circuit 3 selects the signal from the manual adjustment "a2" and outputs it to the operating end. is connected, and the indicator 43 is
Instructs the signal (EO) from the voltage generation circuit 5. Therefore, even if the microprocessor 1 is in a faulty state, the operator can perform the same operation as manual adjustment during normal operation, i.e., adjust the indicator 4.
While looking at the indicated value in step 3, press the manual operation switch 511.51.
By operating 2, the operating end can be manually adjusted.

Here, in the voltage generation circuit 5, a manual operation switch S
When WI, SW2 are not operated, each switch SL,
52 is off, and a voltage divided by resistors R1 and R2, for example 3V (50%), is output.

When the manual operation switch SW1 is operated (UP operation), the switch St is turned on, and its output voltage EO is greater than 3V (50%) expressed by . Also, when operating the manual operation switch 512 (
oowx operation), the switch S2 is turned on, and its output voltage EO is smaller than 3V (50%) expressed by .

FIG. 3 is a configuration block diagram showing another embodiment of the present invention. In this embodiment, when the operating end is a valve, for example, the valve opening degree can be indicated by switching the changeover switch 7 using the indicator circuit 4. That is, the changeover switch 7 has contacts c and d,
By connecting to the contact C side, the output voltage E0 of the voltage generation circuit 5 is applied to the indicator circuit 4 via the switch 6,
By connecting to the contact d side, a feedback voltage Ef corresponding to the valve opening degree is applied to the indicator circuit 4 via the switch 6.

In the above embodiment, the microprocessor 1 outputs the NOR/FAI signal indicating whether the microprocessor 1 is normal or malfunctioning. You may also do so.

(Effects of the Invention) As described above in detail, the present invention provides a pulse width output controller with good operability that allows manual adjustment in the same way as in normal operations even when the microprocessor fails. can be realized.

[Brief explanation of the drawing]

Figure 1 is a basic block diagram of the controller of the present invention, Figure 2 is a basic block diagram of the controller of the present invention.
The figure is a block diagram showing one embodiment of the invention, and FIG. 3 is a block diagram showing another embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Microprocessor, 2... Microprocessor, 3... Signal selection circuit, 4... Indicator circuit, 5
...Voltage generating circuit, 6...Switch.

Claims (1)

[Claims] Calculate the pulse width and perform UP/DOWN according to this pulse width
a microprocessor that outputs pulses; a manual regulator that outputs UP/DOWN pulses by manual operation; and a manual regulator that selects output pulses from the microprocessor when the microprocessor is in normal operation and when the microprocessor is in failure. a signal selection circuit that selects an output pulse from the controller and outputs the selection signal to the operating end, an indicator circuit that includes a signal holding means, and a voltage generation circuit that outputs a voltage signal corresponding to the operation of the manual regulator; A pulse width output adjustment comprising a switch that applies a signal corresponding to the output pulse of the microprocessor to the indicator circuit when the microprocessor is normal, and applies the output of the voltage generation circuit to the indicator circuit when the microprocessor is in failure. Total.