JPS61142936A - Controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a controller used in fields such as air conditioning control. As shown in the figure, the control motor 105 is output from the digital output unit 102 of the controller 101 via a limit switch 104 provided in the control device 103 that interrupts the circuit when fully open and fully closed.
It is electrically connected to output a signal in the open or close direction, but in order to have a self-diagnosis function, one way to detect when it is fully open or fully closed is to
Two limit switches 106 are used to input their state signals to the digital input section 107 of the controller 101 for feedback.

Problems to be Solved by the Invention However, in the above-mentioned Sakaki Sei, when the controller 101 requires fully open and fully closed status signals, the number of adjustment wheels related to the installation of the specification limit switch 106 of the control device 103 increases, and Separately, wiring work for status signals is required, which has disadvantages such as increased construction costs.

The present invention solves these conventional drawbacks, and has a self-diagnosis function by detecting the energization state on the controller side, thereby eliminating the need for the control equipment side to have a state detection function, and The purpose is to reduce wiring work costs.

Means for Solving the Problems In order to solve the above problems, the microcomputer-controlled controller of the present invention is provided with a detector on the wiring of the digital output section that can detect the presence or absence of current flowing to the control equipment. .

Operation With the above configuration, it becomes possible to compare and determine the presence or absence of a digital output signal and the presence or absence of actual energization.

Example An embodiment of the present invention will be described below with reference to FIG.

In the figure, 1 is a controller having a digital output section 2, and this digital output section 2 is a microcomputer (
(hereinafter referred to as microcomputer) 12 contacts connected to 3. A control device 8 consisting of a power source 4 or a current transformer 5, a control motor 6, a limit switch 7, etc.
and is connected by an electric wire 9. On the other hand, the voltage detection circuit 10 is built into the controller 1, and is used to send a signal to the digital input section 11 when a voltage is generated in the current transformer 5.

In the above configuration, the control device 8 is a device that controls the water volume or air volume, such as an electric pulp or damper operating device, and controls the control motor 6 by the open or close signal of the contact 3.
When the motor rotates forward or reverse and becomes fully open or fully closed, the limit switch 7 interrupts the circuit and stops the operation of the control motor 6. On the other hand, when current is flowing in the circuit due to the open or close signal, a voltage is generated in the current transformer 6, but the voltage detection circuit 1o determines whether this voltage exceeds a specified value and the current is flowing. If so, send the signal to the digital input section.

As an example of use, when the control device 8 is in a fully closed state, when an open signal is continuously output from one of the contacts 3 of the digital output section 2, the control motor 6 is activated, and after a certain period of time, it is fully opened and the limit switch 7 is activated. The microcomputer 12 measures the presence or absence of the output signal and input signal, or the time, until the circuit is disconnected. It is possible to identify abnormal modes such as

In addition to the above embodiments, simple ON-
Even with equipment that performs an OFF operation, it can exhibit effects such as detecting wiring abnormalities.

Effects of the Invention As described above, according to the present invention, when having a self-diagnosis function, since the controller side has a function of detecting the energized state, there is no need for consideration on the control equipment side, and the need for distribution wiring work is also reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a controller and control equipment according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional controller and control equipment. 1... (microcomputer control) controller, 2...
...Digital output section, 12...Microcomputer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A controller comprising: a digital output section that controls a control device; a detection section that detects a current of the digital output section; and a comparison section that compares the presence or absence of a signal from the digital output section with the presence or absence of a current from the detection section.