JPH08154277A - Multiple transmission load control system - Google Patents

Abstract

PURPOSE: To immediately execute processing with highest priority by executing a control command sent from a central monitor controller at all times in the order of priority. CONSTITUTION: In a multiples transmission load controller 30 executing a control command sent from a central monitor controller 10 to control plural terminals 50, a control CPU 32 executes control commands stored in a memory means 34 in the order of higher priority to write the received control commands to areas depending on the priority in the memory means 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission load control system for centrally controlling, for example, a lighting system load or a power system load inside a building by using multiplex transmission lines.

[0002]

2. Description of the Related Art Conventionally, a plurality of load control controllers are connected to a host computer via multiplex transmission lines, and each load control controller is connected to a plurality of load devices and operations via another multiplex transmission line. 2. Description of the Related Art A multiplex transmission load control system configured by connecting switches and the like as terminals is used for controlling lighting system loads and power system loads. In this load control system, load devices of a plurality of systems can be centrally controlled by one transmission line, which is a great advantage that many wirings are not required.

By the way, the load control controller in such a load control system is designed to execute the control commands from the host computer, which is a higher-level device, in sequence in the order in which they are received to control them. That is, all the processes are executed at the same level in the order instructed by the host computer. Therefore, even if an emergency such as a fire or a power failure occurs, these urgent processes cannot be immediately performed with priority, and after the commanded control signal is processed, the next Processing control signals.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the control commands are always executed in the order of higher priority so that the highest priority is given to the occurrence of an emergency such as a power failure or a fire. It is an object of the present invention to provide a highly reliable multiplex transmission load control system that can immediately execute a process to be performed without waiting for the end of the process that is commanded and held in advance.

[0005]

The invention described in claim 1 proposed to achieve the above object is to control each load control controller for controlling a terminal for load control. A CPU, a transmission CPU for transmitting and receiving a multiplex signal transmitted on a multiplex transmission line, and a control command signal received from a central supervisory control device for storing the control command signal separately for each preset priority order. The CPU for control is configured to execute the control command signals stored in the memory in order of higher priority. Here, the control command signal with high priority is
For example, a signal for receiving from a terminal device when an emergency situation such as a power failure or a fire has occurred and instructing emergency processing such as execution of an emergency program is also included. As means for adding a priority to the control command signal, the priority is assigned to each terminal address, and the load control controller 30 is provided with a conversion table, or
A priority identification code is added to the control command signal.

In the invention proposed in claim 2, the memory means is configured as a shared memory commonly used by both the control CPU and the transmission CPU, and the shared memory is sent from the central supervisory control device. The bank is divided into a plurality of banks according to the priority order of the received control command signals. A shared memory commonly used by both the control CPU and the transmission CPU is, for example, a 2-port RAM.
Are used. In each of the plurality of storage areas of the shared memory, the writing point of the control CPU becomes the reading point of the transmission CPU, and conversely, the reading point of the control CPU becomes the writing point of the transmission CPU.

[0007]

In the multiplex transmission load control system according to the present invention described in claim 1, when the load controller receives the control command signal from the central supervisory controller, the control CPU is
A preset priority level is discriminated, and based on the discrimination result, it is written in an area corresponding to the priority of the memory means, and a control process is instructed to the transmission CPU. The transmission CPU first processes the instruction written in the area having the highest priority in the memory means, and after the processing of this area is completed, successively processes the instructions of the areas in the order of lower priority. . In the process of this processing, whenever data enters an area having a higher priority than the area being processed, the processing of that data is executed with priority.

In the multiplex transmission load control system according to the second aspect of the present invention, the control CPU is used as the memory means.
The shared memory, which is commonly used by both the transmission CPU and the transmission CPU, is divided into a plurality of storage areas according to the priority order. Therefore, the control command data is stored in a predetermined storage area according to the priority applied to the storage area. Written to area. The control CPU and the transmission CPU sequentially access the data in the data area to the shared memory using the pointer of the storage area as a key, and execute the required processing.

[0009]

Embodiments of the system of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing the basic configuration of the multiplex transmission load control system proposed in claim 1. Multiple load control controllers 3
Each 0 is a multiplex transmission line 41 consisting of a pair of lines.
Each of the multiplex transmission lines 41 has a relay for turning on / off a load device (not shown) such as a lighting device and an air conditioner, and a load device that is manually turned on / off.
A wall switch that is turned off is connected as a terminal device with an address set for each. Further, an external setting device 31 configured by a personal computer or the like is connected to each load control controller 31, and the external setting device 31 is operated to input and set an execution command of a control program and necessary control data. It is like this. A plurality of terminals 50 are connected to each of the load controllers 30 via multiplex transmission lines 41, and a plurality of load control system systems (three systems are illustrated in the figure) as a system basic configuration are constructed.

The operation switch included in the terminal 50 is an individual switch for controlling on / off of one load device, a dimming switch for dimming a lighting device, and grouping in advance. There are pattern control switches and group switches that turn on / off the loaded load devices, collective control switches that turn on / off all load devices, and pattern and group setting switches.

Further, a plurality of load control controllers 30
Is connected to the communication control device 20 via a multiplex transmission line 40 configured by a pair line different from the multiplex transmission line 41 connecting the terminal device 50, and the communication control device 20 is configured by a host computer or the like. Central monitoring and control device 10
Are connected. Further, an external setting device 31 formed of a personal computer or the like is connected to each of the load control controllers 30.

Various control commands are issued to the central supervisory controller 10.
And is transmitted to each load control controller 30 via the communication control device 20. Each load control controller 30 individually controls the terminal device 50 via each multiplex transmission line 41 to execute various processes. Each load control controller 30 performs multiplex transmission with a control CPU 32 (shown as a main CPU) that executes an application process for executing the control shown in FIG. 2 and controls the terminal device 50 for load control. Transmission CPU 33 for transmitting and receiving multiplexed signals transmitted on the line 41, and control CP
It has a shared memory 34 commonly used by both the U 32 and the transmission CPU 33. Here, shared memory 3
In 4, the control command signals received from the central supervisory control device 10 are stored separately for each preset priority order.

FIG. 3 shows the configuration of the shared memory 34 in the multiplex transmission load control system proposed in claim 2. This shared memory 34 is a 2-port RA
M is used, and the entire area is divided into first to third storage areas B1 to B3 in accordance with the priority order added in advance to the control command signal sent from the central supervisory control device 10. Each of the storage areas B1 to B3 constitutes a ring buffer and is independent of each other, and each has a control CPU 32.
Write pointer for writing by the transmission CPU 33
And a control CPU.
A read pointer for the 32 to read (transmission CPU
33 serves as a write pointer). Therefore, the CPUs 32 and 33 sequentially access the data stored in the data area (ring buffer) using the pointer as a key, and execute various processes.

Each of the storage areas B1 to B3 is divided according to the priority of the control command signal sent from the central supervisory control device 10. That is, the first storage area B1 stores a control command such as a state change notification of the highest priority type such as power failure or fire occurrence,
The second storage area B2 stores the control command of the status change notification of the type having a relatively high priority level, and the third storage area B2.
3 stores a control command of a type with a low priority level such as a state monitor-related, normal control or various setting processes.

On the other hand, from the central supervisory control device 10, for example, a control command signal in which a command as shown in FIG. 4, an address of the terminal device 50, and an ON or OFF control command are arrayed and combined is output. The priority order of the control command signal is assigned to the address of the terminal device 50 in advance on the controller side. Next, the control operation of the load control controller 30 that receives the control command signal from the central monitoring control device 10 will be described. Steps S1 to S3 in FIG. 5 show this basic operation processing.

That is, when the load controller 30 receives the control command signal, the control CPU 32 thereof receives the control command signal.
The terminal address of the control command signal is collated with a conversion table in which priorities are assigned in advance, the terminal address of the control command signal and the control command are written in the storage areas B1 to B3 of the shared memory 34, and the control process is transmitted. For CP
Command U33.

On the other hand, the transmission CPU 33 processes according to steps S4 to S8 of FIG. That is, the transmission CPU 33 executes the processing until the processing instructed to the first storage area B1 having the highest priority is exhausted, and subsequently, similarly, the processing of the second and third storage areas B2 and B3 is performed. However, in the middle of this process, the first storage area B
If the received data is stored in the first or second storage area B2, B3, the processing is preceded. That is, since the processes with the highest priorities at that time are always executed in order, the urgent processes such as power failure and fire occurrence are executed almost immediately at the same time as the occurrence.

The control command signal shown in FIG. 4 is formed by allocating the relationship between the priority and the control command to the terminal address, but the control command added with the priority identification code from the host computer side. May be transmitted. In this case, it is not necessary to provide the conversion CPU in the control CPU 32 of the load controller 30.

[0019]

According to the multiplex transmission load control system of the present invention described in claims 1 and 2, when a priority order is assigned in advance to a control command and the control command is received from the central supervisory control device, , Control can always be executed with priority in descending order of priority. Therefore, an urgent process due to a power outage or a fire can be immediately executed, and the reliability becomes high. In addition, since optimum control can be performed according to the load situation at that time, accurate control can always be executed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a multiplex transmission load control system (claims 1 and 2) of the present invention.

FIG. 2 is a block diagram showing a basic configuration of a load control controller.

FIG. 3 Shared memory in the same system (claim 2)
It is an explanatory view showing the contents of.

FIG. 4 is an explanatory diagram showing a control command signal in the same system.

FIG. 5 is a flowchart showing a process of a control CPU in the same system.

FIG. 6 is a flowchart showing a process of a transmission CPU in the same system.

[Explanation of symbols]

 10 central supervisory control device 20 communication control device 30 load control controller 32 control CPU 33 transmission CPU 34 shared memory 41 multiplex transmission line 40 multiplex transmission line 50 another terminal device

Claims (2)

[Claims] 1. Multiplex transmission of a plurality of systems, each of which has a load control controller, and a plurality of load devices, operation switches, etc. are connected as terminals through a multiplex transmission line for each load control controller. In the multiplex transmission load control system configured by connecting the load control system to the communication control device by another multiplex transmission line, and connecting the central monitoring control device to the communication control device, each of the load control controllers is A control CPU for controlling a terminal device for load control, and a transmission CP for transmitting / receiving multiple signals transmitted on a multiple transmission line
U and memory means for storing the control command signal received from the central supervisory control device by dividing them according to a preset priority order, and the control CPU stores in the memory means. A multiplex transmission load control system configured to execute the generated control command signals in order of high priority. 2. A memory according to claim 1, wherein said memory means constitutes a shared memory commonly used by both said control CPU and transmission CPU, and said shared memory is sent from said central supervisory control unit. A multiplex transmission load control system configured to be divided into a plurality of storage areas according to the priority order of the received control command signals.