JPS5850100A - Measuring input excess signal transmission system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote monitoring control device and a remote monitoring device, and more particularly to a digital measurement transmission method in which analog measurement input is converted into digital data and then measured and transmitted.

Transmission of input excessive signals in conventional digital measurement is
Excessive measurement input, examples of which are shown in Figures 1 and 2.
If detected, it is transmitted as a measurement data output rewriting prohibition signal with 1 bit of the lag in the measurement word due to the zero condition of poor accuracy, and the Sv
It is transmitted to the master station at 1 pit in the information and output as a measurement abnormality.

For this reason, when monitoring was performed at the master station, it was not easy to investigate the cause of a measurement abnormality. Furthermore, if excessive input signals are to be transmitted individually as Sv information, alignment will occur, such as an increase in the number of 987 points, which requires 87 points corresponding to the number of measurement inputs.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of conventional methods and provide a measurement input excessive signal transmission method with good transmission efficiency.

In the conventional system, due to the restriction of 87 points, the measurement input excessive signal was also transmitted as an error in the A-D converter, and then the above-mentioned alignment occurred.

The feature of the present invention is to focus on the fact that there is an idle bit (2 flag bits) in the measurement word, and to output the excessive input detection signal in the A-D converter in synchronization with the output of the digital conversion data. The aim is to transmit the measurement input excessive signal along with the measurement data using the idle bit.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

A taken out via an analog scanner in Fig. 3
-D input signal 6 is based on A-D start signal 8! 1)A
- Analog-digital conversion is performed in the D conversion circuit 19,
The converted data is output as A-D converted data 25 to the converted data output circuit 24 . On the other hand, if excessive human power is detected after digitally converting the measurement input, it is input as an excessive input detection signal 26 to an excessive human power output gate 28 . Here, total I
11 data scanning signal 22, output as a transmission data bus 11, converted by a P-8 converter into the transmission format shown in FIG. 4, and then sent to the master station.

In addition, in the accuracy check circuit 23, the reference voltage from the reference voltage generation circuit 20 is digitally converted by the A-Di conversion circuit 19 according to the accuracy check timing signal 21, and then taken out as A-D conversion data 25 and checked for accuracy. Here, when an accuracy check failure is detected, it is output as an accuracy failure detection signal 27, and is sent to the master station as a measurement data output rewriting prohibition signal with a flag of 1 bit, and as an A-D converter abnormality signal 9. The data is output and sent to the master station as SV information.

As described above, according to this embodiment, only A-D accuracy defects are
- It is possible to transmit Sv information as an abnormality in the D converter, and it becomes easy to investigate the cause of the failure, which was a permanent problem in the conventional system.

According to the present invention, it is possible to transmit an excessive input signal corresponding to a measurement input without increasing the number of SV sunspots, and the transmission efficiency is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional device, FIG. 2 is an internal block diagram of a conventional A-D converter, and FIG. 3 is an internal block diagram of an A-D converter to which the present invention is applied. FIG. 4 is a diagram of a measurement data transmission format to which the present invention is applied. 6... A-D input signal, 8... A-D start signal, 9... A-D converter abnormality signal, 11... Transmission data base, 19... A-D conversion circuit, 20 ...Reference voltage generation circuit, 21...Accuracy check timing signal,
22... Measurement data scanning signal, 23... Accuracy check circuit, 24... Conversion data output circuit, 25... A
-D conversion data, 26...input excessive detection signal, 27.
...Inaccuracy detection signal, 28...Input excessive output gate. Agent: Patent attorney Akio Takahashi, Figure 1? (Figure 2, No. 4 □ Talented Hiroko - Manpower revived customer fake number)

Claims (1)

[Claims] 1. In the digital measurement transmission method that converts analog measurement input into digital and performs measurement, after converting the measurement input from analog to digital, excessive input is detected and A-D
The input excessive signal output circuit provided in the converter outputs the input excessive detection signal in synchronization with the output of the digital conversion data, and transmits it together with the measurement data using any pit in the transmission word. A measurement input excessive signal transmission method characterized by: