JP2002041103A - Plant controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant controller capable of reducing the kinds of various input and output devices to be controlled by a plant control side, and preventing any malfunction due to a noise. SOLUTION: This plant controller is provided with an input and output device 1 (1N, 1T) of a controller and a relay module unit 3 as an interface between plant equipment and the other controller, and the input and output to/from the plant equipment and the other controller is indirectly controlled. Thus, it is possible to reduce the number of stand by input and output devices at the plant control side by reducing the kinds of the input and output devices, and to prevent any malfunction due to a noise in a controller disc by separating the circuit partition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant controller using a relay module unit as an input / output device of a controller for controlling a plant and an interface of plant equipment.

[0002]

2. Description of the Related Art An input / output device is provided between a controller for controlling a plant and plant equipment or another controller. Input / output devices are used for interfaces between plant equipment and other controllers. For this reason,
It is necessary to select an input / output device that meets the interface specifications. Input / output devices that are generally used include an AC power supply, a DC power supply, a strong current, a weak current, and the like.
For this purpose, a wide variety of input / output devices have been developed and supported.

[0003]

The input / output devices are diversified, and the controllers with remarkable technological progress have been improved.
Because of the development, the management of the spare input / output device for dealing with the input / output device failure is complicated on the plant management side. In particular, in the relay type input / output device used for high-power circuits,
At present, the operation assurance period is extremely shorter than that of the transistor type input / output device used in the weak current because the operation assurance period includes the number of relay operations.

In addition, as controllers become smaller and space is reduced, input / output devices can be installed on a conventional controller panel more than before, so that the mixing ratio of high and low currents increases, and there is a concern that malfunctions due to noise may occur. .

It is an object of the present invention to provide a plant control apparatus capable of reducing the types of various input / output devices managed by the plant management side and preventing malfunction due to noise.

[0006]

According to the present invention, a relay module unit is provided as an interface between an input / output device of a controller and plant equipment / other controllers,
Indirect control of input and output to plant equipment and other controllers reduces the number of spare input and output devices on the plant management side by reducing the number of input and output devices, and prevents noise malfunctions in the controller panel by separating circuit sections. measure.

More specifically, the present invention relates to a technique for connecting an interface between a controller and a plant device. It employs a mechanism to provide a relay for separating high and low currents to assist input and output to plant equipment.

According to the present invention, even if the state of the plant equipment is taken in a high-current circuit of DC or AC, it is once received by the relay of the relay module unit, and the relay contact is connected to the input device of the controller, so that the controller input / output device is electrically connected. By operating the relay of the relay module unit with the low-power output device of the controller and using the relay contacts for the plant equipment operation circuit,
Even if the plant equipment is a direct current or alternating current strong electric circuit, it can be handled.

In addition, since all the input / output devices of the controller can cope with the weak current, the size of the input / output device of the controller is limited, and the input / output device with a built-in relay corresponding to the high current becomes unnecessary. Therefore, it is possible to reduce the size of the input / output device of the controller and reduce the power consumption.

[0010]

FIG. 1 shows an embodiment of the present invention.
FIG. 1 shows a combined configuration of an input / output device 1 and a relay module unit 3 of a controller. FIG. 1A shows an input device 1N, and FIG. 1B shows an output device 1T.

In FIG. 1, an input / output device 1 of the controller is composed of an input device 1N and an output device 1T. The input device 1N includes a resistor 13 for obtaining a state signal from a plant device (not shown) at a constant current, and a photo for converting a plant device state to a transmission control circuit 11 for transmitting the state of the plant device to a controller (not shown) according to a current value. It comprises a transistor 12, a diode 14, and a resistor 15.

The output device 1T includes a transmission control circuit 11 for outputting a plant equipment operation command from a controller.
And a phototransistor 12 for converting a signal of the transmission control circuit 11 into an electric signal, a transistor 21 for suppressing a current flowing to a connection terminal of the output device 1T by a current flowing through the phototransistor 12, and a resistor 16. You.

When the relay module unit 3 is connected to the input device 1N, the contact a1 side of the relay RY1 of the relay module unit 3 is connected to the connection terminal of the input device 1N. The relay (operation coil) RY1 of the relay module unit 3 is connected to a state signal of the plant equipment. 3A is an AC power supply, and 3B is a DC power supply.

When connecting to the output device 2, the relay (operation coil) RY2 of the relay module unit 3 is connected to the connection terminal of the output device 2, and the contact a2 of the relay RY2 of the relay module unit 3 is connected to the plant device operation terminal. Used as

As for the plant equipment input, when there is an input of the plant equipment, a current flows through the relay operation coil RY1 of the relay module unit 3, and the corresponding relay contact a1 is turned on. Thereby, the input device 1N of the controller
It can be seen that an electric current flows through the phototransistor 12 and that there is an input from the plant equipment.

When there is no input from the plant equipment, no current flows through the relay operation coil RY1 of the relay module unit 3, and the corresponding relay contact a1 is turned off. As a result, no current flows through the phototransistor 12 of the input device 1 of the controller, and it can be seen that there is no input from the plant equipment.

On the other hand, when an operation command to the plant equipment is received from the output device 1T, the phototransistor 1
2, the transistor 21 for flowing the current to the connection terminal operates, and the relay module unit 3
Current flows through the relay operation coil RY2 of the relay contact a
2 is in the closed state. For this reason, the terminals of the relay module unit 3 are energized, and current can flow through the coil that operates the plant equipment.

If there is no operation command from the output device 1T, no current flows to the phototransistor 12, and the transistor 21 for flowing current to the connection terminal does not operate. Therefore, no current flows to the relay operation coil RY2 of the relay module unit 3. , The relay contact a2 is turned off. For this reason, the terminal of the relay module unit 3 is in a cutoff state, and it is impossible to supply current to the coil that operates the plant equipment.

As described above, the relay module unit 3
By using the relay, the strong electric power of the plant equipment and the weak electric power of the controller can be separated via the relay, and the control power supply of the plant equipment can be connected irrespective of the circuit classification such as DC, AC, strong electric and weak electric.

FIG. 2 shows the appearance and internal wiring of the relay module unit 3 of the first embodiment. FIG. 2 (a)
Is an internal wiring diagram, and FIG. 2B is an external view. The relay module unit 3 is a connector for connecting to the input / output device 1 of the controller, a terminal for connecting to plant equipment, a high-current relay and a low-current relay for separating a circuit division between the input / output device 1 and plant equipment, and a relay for mounting each relay. Terminal block,
A fuse 34 for short-circuit protection of the control power supply on the plant equipment side, and a power supply connection terminal for supplying electricity to the circuit of the input / output device 2 of the controller.

In this configuration, when the input device 1N is connected to the input / output device 1 connection terminal of the controller, the low current relay is connected to the relay terminal block suitable for each relay when the output device 1T is connected. By connecting, the circuit in the relay module unit 3 can be used as a relay module unit 3 for plant equipment input or as a relay module unit 3 for plant equipment output. This is a relay module unit 3 for switching the connection method suitable for 2.

When used for plant equipment input,
By connecting the high-power relay to the relay module unit 3, the plant device operates the relay operation coil 39aDI, and the input device 1N side of the controller has a circuit configuration connected to the relay contact a1.

In this circuit configuration, when there is an input from the plant equipment, a current flows through the strong current relay operating coil 33a, and the strong current relay contact 33b is turned on, so that a current flows through the phototransistor 12 of the input device 1N of the controller. Therefore, it is understood that there is an input from the plant equipment.

However, if there is no input from the plant equipment,
Since no current flows through the high-voltage relay operating coil 33a and the high-voltage relay contact 33b is cut off, no current flows through the phototransistor 12 of the input device 1N of the controller, and it is determined that there is no input from the plant equipment.

When used for plant equipment output,
By connecting the low current relay to the relay module unit 3, the output device 1T side of the controller operates the relay operation coil 39aDO, and the plant device side has a circuit configuration connected to the relay contact 39b.

With this circuit configuration, the output device 1 of the controller
When an operation command is output from T, the weak current relay operation coil 3
When a current flows through 2a and the weak current relay contact 32b is turned on, a current flows through the control coil that operates the plant equipment, and the equipment can be operated.

If an operation command is not output from the output device 1T of the controller, current does not flow through the weak current relay operating coil 32a and the weak current relay contact 32b is cut off, so that current flows through the control coil that operates the plant equipment. Equipment cannot be operated.

It should be noted that the plant equipment side is operated even if a reverse low-current relay is used for plant equipment input or a reverse high-power relay is used for plant equipment output. There is no relay operating coil 39a and relay contact 39b of the relay module unit 3 for preventing misplacement. However, if both the high-current relay and the weak relay are connected in the relay module unit 3, there is a possibility that a short-circuit accident may occur. Therefore, the relay module unit 3 in consideration of short-circuit prevention will be described below.

FIG. 3 shows the appearance and internal wiring of the relay module unit 3 of the second aspect. FIG. 3 (a)
Is an internal wiring diagram, and FIG. 3B is an external view.

The relay module unit 3 has a connector 35 connected to the input / output device 1T of the controller, a terminal 36 connected to the plant equipment, a relay 39 for separating a circuit section between the input / output device 1 and the plant equipment, and a relay. It is composed of a relay terminal block 36, a relay module unit use switch 38, a fuse 34 for protecting a control power supply short-circuit on the plant equipment side, and a power supply connection terminal for supplying electricity to a circuit of the input / output device 2 of the controller.

In the configuration of FIG. 3, in order to improve the relay mounting efficiency of the relay module unit 3 of FIG. 2, the application of the relay module unit 3 is switched by a switch instead of being switched according to the type of relay to be connected. It was made.

When the input device 1N is connected to the input / output device 1 connection terminal of the controller, the relay module unit use switch 38 is turned on. When the output device 1T is connected, the relay module unit use switch 38 is turned off. State. Relay module unit for inputting the circuit in relay module unit 3 to plant equipment
The relay module unit 3 switches between a connection state suitable for the input / output device 1 of the controller by switching between use as the relay module unit 3 and a relay module unit 3 for plant equipment output.

When used for plant equipment input,
By turning on the relay module unit use switch 38, the plant device side operates the relay operation coil 39a, and the input device 1 side of the controller has a circuit configuration connected to the relay contact 39b.

In this circuit configuration, when there is an input from the plant equipment, a current flows through the relay operating coil 39a, and the relay contact 39b is turned on.
Since the current flows through the phototransistor 12, the input from the plant equipment is found. However, if there is no input from the plant equipment, no current flows through the relay operating coil 39a and the relay contact a1 is cut off, so that no current flows through the phototransistor 12 of the input device 1N of the controller, and the current from the plant equipment does not flow. It turns out there is no input.

On the other hand, when used for plant equipment output, by turning off the relay module unit application switch 38, the output device 1T side of the controller operates the relay operation coil RY2 (39a). The plant device has a circuit configuration for connecting to the relay contact a2.

With this circuit configuration, the output device 1 of the controller
When an operation command is output from T, the relay operation coil RY2
When the relay contact a2 is turned on, a current flows through the control coil that operates the plant equipment, and the equipment can be operated. But the controller output device 2
If no operation command is output from the relay operation coil RY2
Current does not flow through and the relay contact a2 is cut off.
Current does not flow through the control coil that operates the plant equipment, and the equipment cannot be operated.

Also, when the relay module unit use switch 38 is turned off for the purpose of plant equipment input or the relay module unit use switch 38 is turned on for the purpose of plant equipment output use, the plant Since there is no relay operation coil RY2 and relay contact a2 of the relay module unit 3 for operating the device side, there is no malfunction.

The interface is performed in this manner. The low-current relay operating coil and the high-current relay contact are wired to a connector connected to the input / output device of the controller.
By wiring the low-current relay contact and the high-voltage relay operating coil to the terminal block that connects to the interface of the plant equipment, the input / output direction can be switched by changing the relay used, and the input / output of the controller can be performed regardless of the circuit classification of the plant equipment. Since the equipment can be unified to low-power input / output devices, it is possible to reduce the variety of various input / output devices that were conventionally managed by the plant management side, and to prevent noise malfunction in the controller panel by separating circuit sections. it can.

Further, regarding the connection technology between the controller and the interface of the plant equipment, in order to unify the input / output device of the controller to be used, the input / output to the plant equipment is performed between the input / output device of the controller and the interface of the plant equipment. There is a relay for separating high and low current to assist As a result, even if the state of the plant equipment is captured, even if the circuit is a DC or AC high-current circuit, the relay of the relay module unit receives the relay once and the relay contact is connected to the input device of the controller. By operating the relay of the relay module unit with the low-power output device of the controller and using the relay contacts in the plant device operation circuit, it is possible to cope with the case where the plant device is a DC or AC high-current circuit.

Further, since all the input / output devices of the controller can cope with low current, the size of the input / output devices of the controller is limited, and a high-current compatible input / output device with a built-in relay becomes unnecessary. Therefore, it is possible to reduce the size of the input / output device of the controller and reduce the power consumption.

[0041]

According to the present invention, it is possible to reduce the types of various input / output devices which have been conventionally managed by the plant management side, and to prevent noise malfunction in the controller panel by separating circuit sections. it can. Also, measures for the operation guarantee period of the input / output device based on the relay operation frequency, and without using the relay type input / output device, which is an input / output device with a short operation guarantee period,
Since only the relay of the relay module unit needs to be supported, it can contribute to improvement of maintenance and inspection work.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is an example configuration diagram of a relay module unit.

FIG. 3 is another example configuration diagram of a relay module unit.

[Explanation of symbols]

1 ... input device, 11 ... control circuit, 12 ... phototransistor, 13 ... resistor, 2 ... output device, 21 ... transistor, 3 ... relay module unit, 32 ... light current relay, 32a ... light current relay operation coil, 32b ... light current relay Contact, 33… High-voltage relay, 33a… High-voltage relay operating coil, 33b… High-voltage relay contact, 34… Fuse, 35… Input / output device connector, 36… Plant equipment connection terminal block,
37 ... I / O device power supply, 38 ... Relay module unit application switch, 39a ... Relay operation coil, 39b ... Relay contact

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (2)

[Claims] 1. An input / output device of a controller for controlling a plant, and a relay module unit provided between the input / output device and plant equipment constituting the plant, wherein the relay module unit includes a low-current relay and a low-current relay. It has a connection terminal, a high-voltage relay, a high-voltage relay connection terminal, a connector to connect to the input / output device of the controller, a terminal block to connect to the interface of the plant equipment, and a power supply connection terminal to supply electricity to the circuit of the input / output device of the controller. A plant control device, wherein the contacts of the low-energy relay and the high-energy relay are connected to a connector that connects to the input / output device, and the contacts of the low-energy relay and the high-energy relay are connected to a terminal block that connects to plant equipment. . 2. An input / output device of a controller for controlling a plant, and a relay module unit provided between the input / output device and plant equipment constituting the plant, wherein the relay module unit is used for a relay module unit. A switch, a relay, a relay connection terminal, a connector for connecting to the input / output device, a terminal block for connecting to the interface of the plant equipment, a power connection terminal for supplying power to the input / output device, and an input / output direction using the application switch. A plant control device characterized by switching.