JPS63123246A - Multi-point control system - Google Patents

Abstract

PURPOSE:To shorten a processing time by making it possible to communicate other device to be controlled when plural devices to be controlled and a bus control device connected to a point-to-point receive a transmitting request from the device to be controlled. CONSTITUTION:A CPU 11 of a control device 1 sends the control data with an address through a communication interface 12 to a data line 14 and sends them to all plural devices to be controlled 21-2n connected by a multi-drop. Respective devices to be controlled 21-2n execute the processing of the control data only to its own device, and after the processing is completed, and transmit them through control signal lines 312-3n2 to a bus control part 13 of the control device 1. When the bus control part 13 receives the transmitting request, the transmitting request receiving from other devices to be controlled 21-2n cannot be executed, and the communication can be executed through a data line 14 only at the section of the devices take controlled to which the transmitting request is performed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides multipoint control that can control all of a plurality of controlled devices in a short time in a control system centered on a control device having a central processing unit. Regarding the method.

[Prior Art] Conventionally, when a data transmission control procedure between a control device and a controlled device is non-procedural, a multipoint control method using multi-drop connections is used for a plurality of controlled devices.

FIG. 3 shows the configuration of a conventional control system.

In the control system shown in FIG. 3, the control device 1 has n controlled devices.
(21 to 2n) are connected by a multi-drop method. Here, when control data with address data specifying the controlled device 21 is transferred to the communication interface 12 under the control of the CPU II, the transferred control data is sent to all controlled devices (21 to 2n). Each communication interface (211 to 2n) of all controlled devices (21 to 2n)
2n1), the address data of the control data is analyzed. In other words, in the communication interfaces 221 to 2nl, it is determined whether the address data matches or does not match, and reception control data that matches the address data is ignored, while reception control data that matches the address data is recognized as data addressed to the own device and is controlled. Perform processing according to the data. After the processing is completed, response data is transmitted to the control device 1 via the communication interface 211.

In the control device 1, response data is received through the communication interface 12, and the received data is transferred to the CPU II, thereby completing control of the controlled device 21. Next, the controlled device 22 is controlled in a similar manner. In this way, the controlled devices 2n are sequentially controlled, and the control of all controlled devices is completed. In this case, the control device 1 and the controlled device (
21 to 2n) is negligible compared to the processing time m within the controlled device, the time required to control all the controlled devices is nxm.

[Problems to be Solved] In the multipoint control method in the conventional multidrop connection described above, the control device 1 to the controlled device 21 . ,
．． After sending the control data to the controlled device 21.2n, the controlled device 21. ,
．． 2n, the next controlled device 21, . The control can be transferred to the 2n control. Therefore, if there are many controlled devices,
It took a long time to complete control of all controlled devices.

[Means for Solving Problems] The present invention has been made in view of the above circumstances, and is a multi-point system for controlling communication between five control devices and a plurality of controlled devices connected to this control device using a multi-point method. In the point control method, the control device is provided with a bus control section connected to the plurality of controlled devices and point-to-point, and when there is a transmission request from one of the controlled devices, the bus control section Disabling controlled devices other than the one controlled device from transmitting, and canceling the disablement of transmitting from the controlled devices other than the one controlled device after the transmission from the one controlled device is completed. It is characterized by

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a control system to which a multi-point control method according to the present invention is applied, and the same parts as in the conventional control system shown in FIG. 3 described above are given the same reference numerals. The explanation will be omitted.

This control system differs from conventional control systems in that:
The point is that the control device 1 is provided with a bus control section 13. This bus control unit 13 is connected to each controlled device 21. ．． ．． 2n, and a control signal line 311 for transmittable data. ,．． 3nl and transmission request control signal lines 312, . 3n2 in a point-to-point manner, and is connected to the communication interface 12 by a reset signal line 16. Each controlled device 21. ．． ．． 2n is a transmission request control signal line 312. ,．． 3n2, the bus controller 13 sends a transmission request to the bus controller 13 via the transmittable data control signal line 311.3n2. ,.

3nl to each controlled device 21. ．． ．． Supply transmittable data to 2n. The controlled device 21 that received this transmittable data. ,．． 2n is permitted to send data to the communication interface 12.

Further, the bus control section 13 is reset by a reset signal supplied from the communication interface 12 via the reset signal line 16.

The operation shown in FIG. 1 will be explained with reference to FIG.

The control data with address data of the controlled device is sent to the CPU.
The data is transferred to the communication interface 12 under the control of II. The transferred control data is transmitted through the data line 14 to all controlled devices 21. connected in a multi-drop manner. ,．． 2n
Send to. After the data transmission is completed, the next controlled device 21, . Sends control data with 2n addresses. Repeat all controlled devices 21. ,．． Send control data to 2n. Each controlled device 21. ．． .

2n processes only the control data addressed to its own device, and after completing the processing, sends a transmission request to the control device l via control signal lines 312, .
Send via 3n2. Controlled device 21. ,．． The bus control unit 13, which is in the ready state R (F2), receives the transmission request from the controlled device 21.2n. ,．． The transmission request from 2n is accepted (F3). The bus control unit 13 is connected to other controlled devices 21, . Unfortunately, it is impossible to accept the transmission request from 2n (F4), and the controlled device 21.
,．． 2n to control signal lines 311, . 3n
(F5).

Controlled device 21 that has received transmittable data. , -2n is
Response data indicating the completion of processing is transmitted to the control device 1 via the data line 15. In the control device 1, the communication interface 12
The controlled device 21. ,.

Response data from 2n is received. The communication interface 12 transfers the received response data to the CPLll, and sends a reset signal to the bus control unit 13. Waiting for reset signal to be sent from communication interface 12 (F8)
The bus control unit 13 that was
l), controlled device 21. ,．． The transmission request from 2n is enabled to be accepted (F2). The bus control unit 13 controls the controlled devices 21 . ,．． While the transmission request from the sexual fluid control device 21.2n cannot be accepted, the sexual fluid control device 21. ．． .

When there is a transmission request from 2n (F6), the request state is held (F7). Next, the controlled device 21. ,．．
The bus control unit 13, which is now able to accept the transmission request from the controlled device 21. ,．． Send ready data to 2n. The process is sequentially repeated until all controlled devices 21, . 2n, all the controlled devices 21.2n are received. ,．． Control for 2n is completed. Similar to the conventional control system, the communication time between the control device 1 and the controlled devices 21 to 2n is limited to the controlled device 21. ,．． 2
If the time is negligible compared to the processing time m within n, all controlled devices 21. ,.

The time required to control 2n is m.

[Effects of the Invention] As explained above, according to the present invention, the control device and
In a multipoint control method that controls communication between a plurality of controlled devices connected to the control device by a multipoint method, the control device has a bus connected to the plurality of controlled devices and point-to-point. A control unit is provided, and this bus control unit disables the controlled devices other than the one controlled device from transmitting when there is a transmission request from the one controlled device, and prevents the controlled devices from transmitting data from the one controlled device. After the transmission is completed, the transmission disable status of the controlled devices other than the one controlled device is canceled, which reduces the processing time required to control all n controlled devices in the conventional control system. This has the effect of reducing the processing time required to one-nth.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a control system to which the multi-point control method according to the present invention is applied, FIG. 2 is a flowchart showing the operation of the bus control unit 13 used in the control system, and FIG. 3 is a conventional control system. FIG. 1 is a block diagram showing the configuration of the system. Control device 11: Central processing unit (CPU) 12: Communication interface 13: Bus control unit 14.15: Data line 16: Reset signal line 21.22. ,．． 2n: Controlled device 211.221. ,．． 2nl: Communication interface 311.321. ,．． 3nl = control signal line for transmittable data 312.322. ,．． 3n2: Control signal line for transmission request

Claims (1)

[Claims] In a multipoint control method that controls communication between a control device and a plurality of controlled devices connected to the control device by a multipoint method, the control device has a point-to-point connection with the plurality of controlled devices. A connected bus control unit is provided, and when there is a transmission request from the one controlled device, the bus control unit disables the controlled devices other than the one controlled device from transmitting, and A multi-point control system characterized in that, after transmission from a control device is completed, transmission disablement of controlled devices other than the one controlled device is canceled.