JPH07336776A - Load control system using multiplex transmission - Google Patents

Abstract

PURPOSE:To obtain a system in which a load device is forcibly controlled or forcible control is inhibited by having only to connect a controller externally without a control program for the load control system and a control table written in a load controller are not rewritten in the load control system using multiplex transmission. CONSTITUTION:The load control system is a system utilizing multiplex transmission by connecting plural loads and operation switches or the like as terminals 50 to a load controller 30 via a multiplex transmission line 41. A forced controller A is interposed to the multiplex transmission line 41 toward the load controller 30, and the forced controller A is used to decode and process a control signal sent from the load controller 30 or a control command signal sent from the terminals 50 thereby driving a specific load or inhibiting the drive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load control system utilizing multiplex transmission, which is preferably used for lighting control of buildings and the like.

[0002]

2. Description of the Related Art When a plurality of terminals to which addresses are assigned are connected to a common multiplex transmission line, a monitoring signal is periodically sent from the load controller to each terminal, and a reply signal is received from each terminal. , The load controller sends a control signal with an address specified to the multiplex transmission line,
A load control system designed to control a load device connected to a terminal device of a designated address has come to be widely used for lighting control of a building or the like. The terminal devices are divided into groups and the load devices connected to the terminal devices are collectively controlled, or a specific load device is controlled from the grouped load devices, or various control modes are used as pattern control. The control, such as changing to, can be freely set and changed according to the purpose of use.

However, after constructing such a control system, when a load device having a high priority to be driven in conjunction with the occurrence of a power failure or a fire is added, the control stored in the load control controller is added. A part of the table has to be changed, and such setting and changing are generally troublesome. Therefore, there is a demand for an externally attachable control device capable of directly controlling a specific load device connected to the multiplex transmission line while leaving the control table set in the load control controller as it is.

Further, when such a load control system becomes larger, a communication device is connected to a host computer, and a plurality of load control controllers are connected to the communication device via a data transmission line. In such a system, when there is a change in the control data of the load controller or forced control device, data is normally transmitted from the host computer to each load control device via the communication device. The data needs to be reliably transmitted to the forced controller.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and externally connects a specific control device to a multiplex transmission line without changing the control table stored in the load control controller. It is an object of the present invention to provide a load control system capable of giving priority to control of a specific load device over other terminal devices in an emergency such as power failure or fire.

[0006]

According to the present invention, which is proposed to achieve the above object, the compulsory control device is interposed on the load control controller side of the multiplex transmission line, and the compulsory control is performed. The control device decodes the control command signal transmitted from the terminal device or the control signal transmitted from the load control controller to drive a specific load device or prohibit the drive.

According to the invention proposed in claim 2, a plurality of load control controllers are connected to a communication control device connected to a host computer through another multiplex transmission line, and the host computer forcibly controls the load. A load control system using multiplex transmission for transmitting control data to a device, wherein a host computer transmits control data to a load control controller, and when the load control controller receives the control data, the load control system The control controller sends a data matching command signal to the compulsory control device, whereas the compulsory control device requests the load control controller for control data and receives the control data.

[0008]

According to the load control system of the present invention as set forth in claim 1, the forcible control device interposed in the load control controller can control the control command signal sent from the terminal device to the multiplex transmission line and the load control controller. The control signals emitted can be decoded and processed.

That is, when the compulsory control device receives a control command signal from the terminal device, it determines whether or not the compulsory control is performed and determines whether or not the compulsory control is made (compulsory control data). Does not pass the control command signal to the load controller, and sends a control signal on the multiplex transmission line to drive a specific load device, but for those that are not subject to forced control. Passes the control command signal to the load controller.

When a control signal is received from the load control controller, it is determined whether or not the target is forcibly prohibited, and if the target is forcibly prohibited (forced prohibition data), the control signal is output. To the multi-transmission line to block and invalidate. In the load control system according to the present invention as set forth in claim 2, one system of multiplex transmission load control system composed of a load control controller, multiplex transmission lines, and terminals is further connected to another multiplex transmission line through a host computer. Since it is configured to be connected to the communication control device connected to, the host computer can send the compulsory control data and the compulsory prohibition data to the compulsory control devices of the respective systems.

That is, if the host computer sets or changes the forced control data or forced prohibition data of the forced control device, the communication control device transmits the changed forced control data or forced prohibition data to the multiplex transmission line. So
In this way, the load control controller that receives the forced control data and the forced prohibition data sends a matching command signal to the multiplex transmission line to request the load control controller to interrupt the control data from the forced control device. As a result, the compulsory control apparatus receives the compulsory control data and the compulsory prohibition data received by the load controller from the host computer, and updates the contents in the control table to ensure the consistency.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the system of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, the load controller 30 derives a multiplex transmission line 41 with a forced control device A interposed, and a load device (not shown) such as a lighting device is turned on and off in this multiplex transmission line 41. A driving device (relay device) for controlling and an operation switch for controlling on / off of a load device are connected as a terminal device 50 having an address set therein.

Here, as the operation switch included in the terminal device 50, an individual switch for turning on / off one load device, or a switch selected from a plurality of load devices pre-grouped is turned on. , There is a pattern control switch to turn it off. Load controller 30
Is a setting device 2 that is composed of a personal computer, etc.
1 is connected, and by operating the setting device 21, it is possible to set or change control data for forced control and forced prohibition, which will be described later.

In such a system, the load controller 30 has a control table, and when a control command signal is received from the terminal device 50, the load device in the system is driven based on the control table. However, unlike the control table stored in the load controller 30, the compulsory control device A has its own control table for performing compulsory control and compulsory prohibition control.

That is, when the control command signal is transmitted from the terminal device 50 to the multiplex transmission line 41, the compulsory control device A determines whether or not the compulsory control should be performed based on the command code and the address of the terminal device. When performing the forced control, a control signal for driving the terminal device 50 is directly sent to the multiplex transmission line 41 to drive a specific load device.

Further, the forced prohibition control is determined by taking in the control signal sent from the load controller 30 onto the multiplex transmission line 41 in response to the control command signal from the terminal device 50, and determining the command code or Whether or not the target is forcibly prohibited is determined from the address of the control signal, and if so, the captured control signal is not transmitted to the multiplex transmission line 41 to drive a specific load device. Is prohibited.

The basic operation of the forced control device is shown in steps 100 to 111 of FIG. According to the control system provided with such a forced control device A, even when an emergency such as a fire or a power failure occurs, the control program used in the load control system using the multiplex transmission can be changed, It is possible to drive a part of the load equipment in the system or prohibit the drive without rewriting the control table stored in the load control controller.

FIG. 3 shows a load control system according to the present invention as set forth in claim 2, wherein a plurality of load control controllers 30 ... Are connected to the communication control device 20 via another multiplex transmission line 40. The communication control device 20 is connected to a setting device 21 such as a personal computer. The forced control device A is connected to each of the load control controllers 30, and the multiplex transmission line 41 is connected.
Is a terminal for which a driving device (relay device) for controlling on / off of a load device (not shown) such as a lighting device and an operation switch for controlling the on / off of the load device are respectively set with addresses. Connected as a container 50.
Further, each of the load control controllers 30 is connected with a setter 31 configured by a personal computer or the like,
The setting table 31 can also be used to rewrite the control table,
The control program can be changed and set. Note that 51 and 52 are terminal devices that send an abnormality detection signal to the multiplex transmission line 41 when an abnormality such as a fire or a power failure occurs. The abnormality detection signal is sent from the terminal devices 51 and 52 to the multiplex transmission line 41. When sent out, the forced control device A
Then, by referring to the control table, it is determined whether or not the target is forcibly controlled, and if it is determined that the target is forcibly controlled, a control signal is sent to the multiplex transmission line 41, so in the event of a fire, power failure, etc. Can quickly control the specified load device.

The characteristic of the control system shown in FIG. 3 lies in that the forced control and forced prohibition data of the forced control device A can be set or changed from the host computer 10 side. The communication control device 20 is connected, and the load control controller 30 is connected to the communication control device 20 via another multiplex transmission line 40.

In the control system having such a configuration, the control data (forced control data or force prohibited data as described above) to be stored and set in the force controller A of a specific control system is input from the host computer 10. When the control data is input, the communication control device 20
Since the control data is sent to the multiplex transmission line 40, the designated load control controller 30 takes in the control data. When the load controller 30 receives the control data in this way, the load controller 30
Sends a data matching command signal to the multiplex transmission line 41. Therefore, the compulsory control device A that has received this matching command signal sends a control data interrupt request to the load controller 30 and sends it from the load controller 30. The received control data is received, the control data is written in the control table, and the data is updated.

Therefore, according to such a load control system, the control data set by the host computer of the upper level is transmitted from the communication control device to the load control controller, and further transmitted from the load control controller to the forced control device. Therefore, the consistency of the updated control data is ensured. FIG. 4 shows basic operations of the host computer, the communication controller, the load controller, and the forced controller in the load control system of the present invention. FIG. 5 shows the control transmitted from the host computer to the load controller. An example of the data is shown in FIG.
Shows a control command signal for writing the control data of FIG. 5 in the load controller.

When the control data to be set or changed is input to the host computer 10, the load controller 3
As shown in FIG. 5 by the communication control device 20, the command code $ C8 includes the address XX (first 2 bits) of the load control controller and the pattern control code X.
Control data with XXX (next 4 bits) added and control bits X1 to X64 corresponding to the terminal of the control system is transmitted, and then the command code $ C0 and the load controller as shown in FIG. 6 are transmitted. Address XX951
A read command signal specifying 0 is transmitted. here,
X1, X2, X3 ... X64 shown in FIG. 5 are control bits, which are installed in the control system of the load controller.
It is provided corresponding to the terminals to which addresses 1 to 64 are assigned. When the pattern control is to be controlled, the control bit is set to [1], and when it is excluded from the control, [0]. Is set up. For example, X1 = 1, X2 =
When 1, ... X64 = 0, it means that in the pattern control, the terminals at addresses 1 and 2 are to be controlled and the terminals at address 64 are excluded from the controlled.

In this way, in the load control controller which receives the control data and further the read command signal,
The received control data is stored in the memory, the control table is updated, and then a matching command signal is sent to the forced control device A. FIG. 7 shows an example of the matching command signal sent from the load controller to the multiplex transmission line in this case. In the figure, $ C1 is the command code, XX9
Reference numeral 510 represents the address of the compulsory control device, and 1 represents the matching command.

[0024]

According to the load control system of the present invention as set forth in claim 1, the external connection of the forcible control device does not require changing the control program of the system or rewriting the control table to perform multiplex. It is possible to quickly control an arbitrary load device connected to the transmission line.
Therefore, it is possible to control by simply connecting the forced control device without replacing the existing device, so it is possible to incorporate load equipment that should operate in the event of a highly emergency power outage or fire into the system. The work efficiency of construction and maintenance can be improved.

According to the load control system of the present invention as defined in claim 2, since the control data can be transmitted from the load control controller to the forced control device through the communication control device from the host computer side, the control table is changed. Also in this case, it is not necessary to go to the installed location to operate the DIP switch or change the memory by changing the memory.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a load control system (claim 1) of the present invention.

FIG. 2 is a time chart showing the basic operation of the forced control device.

FIG. 3 is a block diagram showing a basic configuration of a load control system (claim 2) of the present invention.

FIG. 4 is a diagram showing a control data transmission operation in the load control system according to the second aspect of the invention.

FIG. 5 is a diagram showing an example of control data transmitted from a host computer to a load controller.

FIG. 6 is a diagram showing an example of a read command signal of control data transmitted from a host computer to a load controller.

FIG. 7 is an explanatory diagram showing an example of a matching command signal transmitted from the load control controller to the forced control device.

[Explanation of symbols]

 A compulsory control device 10 host computer 20 communication control device 21,31 setting device 30 load control controller 40,41 multiplex transmission line 50,51,52 terminal device

Claims (2)

[Claims] 1. A load control system using multiplex transmission, wherein a plurality of load devices, operation switches, etc. are connected as terminal units to a load control controller via multiplex transmission lines, wherein the load of the multiplex transmission line is A forced control device is interposed on the control controller side, and this forced control device decodes the control command signal sent from the terminal unit or the control signal sent from the load control controller to drive a specific load device. Or a load control system using multiplex transmission configured to prohibit its driving. 2. A multiplex control system, wherein a plurality of load control controllers are connected to a communication control device connected to a host computer via another multiplex transmission line, and control data is transmitted from the host computer to the compulsory control device. A load control system using transmission, wherein the host computer transmits control data to a load control controller, and when the load control controller receives the control data, the load control controller sends data to the forced control device. Sends a matching command signal,
On the other hand, the forced control device is a load control system using multiplex transmission configured to request control data from the load control controller and receive the control data.