JPH03226046A - Monitoring device - Google Patents

Abstract

PURPOSE:To eliminate the limit of a data length and the mount by sending serially a data sent/received among a central processing section, an input section, an output section, a transmission section, a reception section and a test section or the like on a 2-wire data line via a serial data input output section. CONSTITUTION:A serial data with an address data is sent from a serial data input output section 7 of a central processing section 1 to a data line 13 and transmitted to an input section 2, an output section 3, a transmission section 4, a reception section 5 and a test section 6 or the like. Serial data input output sections 8-12 connecting to each section fetch a serial data only when an address data coincident with an address given to each section is detected from the transmitted serial data via the data line 13 and does not fetch the data in the case of dissidence. Thus, a bus line comprising plural data lines is not required and a limit to a data length sent/received among the sections is not caused and noise due to mutual induction between signals is not generated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a supervisory control device, and in particular, to a supervisory control device, in particular a system in which signal lines are used to connect each section such as a central processing section, input section, output section, transmitting section, receiving section, and testing section. The present invention relates to a connected monitoring control device having a configuration for exchanging data.

[Conventional technology]

As shown in FIG. 2, a conventional supervisory control device connects a central processing section 14, an input section 15, an output section 16, a transmitting section 17, a receiving section 18, and a testing section 19 to a path line consisting of a plurality of data lines. 20, and data is exchanged between each section using parallel data on the path line 20.

[Problem to be solved by the invention]

Such a traditional monitoring control bag! In this case, the number of path lines 20 is required to be equal to the number of bits of parallel data sent and received between each section, which imposes restrictions on the number of bits of parallel data sent and received between each section, and also requires mutual guidance of signals transmitted on the bus line 20. Therefore, noise is easily generated, there are restrictions on mounting arrangement, and furthermore, when the transmission distance of the path line 20 is increased, synchronization deviation between parallel data is likely to occur, resulting in erroneous data transmission.

[Means to solve the problem]

The apparatus of the present invention includes a plurality of circuit units that exchange data for monitoring and control, a central processing unit that controls processing of the data, and a system for transmitting the data between each of the circuit units and the central processing unit. In the supervisory control device equipped with a signal line, the signal line is one data line for serial data transmission, and each of the circuit units and the central processing unit communicate with each other via the data line. It has a serial data input/output section that sends and receives serial data.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

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

In FIG. 1, a central processing section 1, an input section 2, an output section 3, a transmitting section 4, a receiving section 5, and a testing section 6 are connected to a two-wire data line via serial data input/output sections 7 to 12, respectively. It is connected to 13. Data is exchanged between each section via this data line 13.

For example, the serial data input/output section 7 of the central processing section 1 sends serial data with address data to the data line 1.
3, input section 2, output section 3, transmitting section 4, receiving section 5
, and transmitted to the testing section 6 and the like. Serial data input/output sections 8 to 12 connected to each section take in the serial data only when they detect address data that matches the address given to each section from the serial data transmitted via the data line 13, and Data sent from other parts, which is not captured at the time of , is also received and processed in the same way. Note that address data need not be specified during broadcast transmission.

In this embodiment, there is no need for a path line consisting of multiple data lines, there is no restriction on the length of data exchanged between each part, and there is no noise caused by mutual induction between signals, so it is easy to implement. This also eliminates the constraints of the above, increasing the degree of freedom in device design. Furthermore, since there is no data synchronization shift that occurs on a path line, there are no restrictions on transmission distance, and the degree of freedom can be increased.

〔Effect of the invention〕

As explained above, the present invention transmits and receives data between a central processing section, an input section, an output section, a transmitting section, a receiving section, a testing section, etc. via a two-wire data line through a serial data input/output section. By configuring the above for serial transmission, it is possible to eliminate restrictions on data length and implementation, eliminate noise due to mutual induction between signals, and also eliminate restrictions on transmission distance of path lines. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional supervisory control device. 1.14...Central processing unit, 2,15...Input unit, 3
．． 16... Output section, 4.17... Transmission section, 5.18
...Receiving section, 6.19...Testing section, 7-12...
Serial data input/output section, 13...Data line, 20
··Path line.

Claims (1)

[Claims] comprising a plurality of circuit units for sending and receiving data for supervisory control, a central processing unit for controlling processing of the data, and a signal line for transmitting the data between each of the circuit units and the central processing unit. In the supervisory control device, the signal line is one data line for serial data transmission, and each of the circuit units and the central processing unit is a serial data line for exchanging serial data between each other via the data line. A supervisory control device characterized by having a data input/output section.