JPS6124346A - Remore supervisory and controlling equipment - Google Patents

Abstract

PURPOSE:To measure the transmission level of a specific station by allowing a setting device and a station comparison circuit to measure a station election signal outputted from a controler only when a desired station is selected by a station comparison circuit, interrupting measurement only when the desired station is not selected and keeping only the display of the transmission level. CONSTITUTION:A station selection signal 51 from a controller 1 and station setting data 56 from a setting device 53 are inputted to a station comparison circuit 52 and a comparison output 55 of the station from a station comparator circuit 52 is given to a display storage type level meter 54. When the setting value 56 of the setting device 53 and the content of the station selection signal 51 are coincident, the station comparison circuit 52 outputs logical 1 as the comparison output 55 and in other cases, logical 0 is outputted. The display storage type level meter 54 measures the transmission level for a certain time T and when the time T is elapsed, the display of the transmission leve is updated automatically. Then the display is not updated until the next measurement is started, then the transmission level of the desired station is kept.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a remote monitoring and control device, and particularly to a remote monitoring and control device using a polling method capable of measuring the transmission level of a specific station.

[Technical Background of the Invention] FIG. 2 is a block diagram of a remote monitoring and control device using a polling method, in which a control device @1 and a plurality of controlled devices 2 are connected by a transmission path 4, and a control device @1 is connected to a plurality of controlled devices 2. In this method, a command is output to the controlled device 2 in a time-division manner, and the controlled device 2 that receives the command transmits data via the upstream transmission path 41.

[Problems with the Background Art] In the conventional device having the above configuration, “control is performed from the controlled device 2!” When measuring the transmission level of a specific station on the F transmission path 41 used for transmission to the device 1 using the transmission level crystal 13, since the data of the plurality of controlled devices 2 is transmitted in a time-division manner, A level meter that only measures the normal transmission level has the disadvantage that it cannot be measured at the proper timing.

[Purpose of the Invention] The present invention has been made to solve the above problems, and it is an object of the present invention to select a remote monitoring and control device that can measure the transmission level of a specific station in a polling method that performs time division multiplexing. The purpose is

Summary of the Invention] The present invention provides a setting device, a station comparison circuit, a display holding type level,
The station selection signal outputted from the control device selects the desired station by a station selector and a station comparison circuit, and the separated output is transmitted to a display holding type level analyzer. The measurement is performed only when the desired station is selected, and when the desired station is not selected, the measurement is interrupted and only the display of the transmission level is maintained.

[Embodiments of the Invention] Examples will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a remote monitoring and control device according to the present invention. In FIG. 1, the same symbols as in FIG. 2 have the same functions and correspond to each other. In this embodiment, the station comparison circuit 52, the setting device 5
3. Consists of a display holding type level meter 54.

The station selection signal 51 from the control device @1 and the station setting data 56 from the setting device 53 are input to the station comparison circuit 52, and the station comparison output 55 from the station comparison circuit 52 is delivered to the display holding type level meter 54. be done.

FIG. 3 is a time chart showing a method of measuring the transmission level, and the operation will be explained using this chart.

Ru. In FIG. 3, an upstream transmission path 41 shows that data from a plurality of controlled devices 2 is sent to the control device 1 in a time-division manner. Control device 1 that uses polling method at this time
is the station selection signal 5 output from the control device 1 to receive data on the uplink transmission path 41 after calling the controlled device 2.
1 can be synchronized with data on the uplink transmission path 41. The station selection signal 51 has bit weights assigned to each signal line as shown in FIG.
By outputting 1, it can be identified that station 1 has been selected.

On the other hand, when the setting value 56 of the setting device 53 (in the case of FIG. 3, station 2 is set) and the contents of the station selection signal 51 match, the station comparison circuit 52 outputs "1" as the comparison output 55. , otherwise outputs "0". At this time, the 8-point comparison circuit 52 detects the change in roY-rlr of the comparison output 55 and starts the display holding type level meter 54 for measurement. The display holding type level meter 54 measures the transmission level for a certain period of time ([) in FIG. 3, and automatically updates the display of the transmission level when the time '[] has elapsed. Thereafter, by not updating the display until the next measurement is started, the transmission level of the desired station can be maintained.

FIG. 5 shows another embodiment according to the present invention, in which the weight of the signal line of the station selection signal 51 output from the control device 1 is set to the weight of the station as shown in FIG. By doing so, the station comparison circuit 52 is omitted. The timing chart 17-j at that time is shown in FIG. In FIG. 5, the rotary switch 532 selects station 2, and in this case, only the data of station 2 is output to the display holding type level meter 54. By using this embodiment, it is possible to achieve the same effect as the previous embodiment, and furthermore, the station comparison circuit 52 can be omitted.

[Effect of the Invention 1] As explained above, according to the present invention, it is possible to measure the transmission level of a specific station, and furthermore, the setting value of the setting device 53 can be changed freely with a switch, so that a specific station can be freely selected. This makes it possible to measure the transmission level and improves the maintainability of the transmission line.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of a remote monitoring and control device according to the present invention, Fig. 2 is a block diagram of a remote monitoring and control device using a polling method, and Fig. 3 explains a method of transmitting and measuring all signals. FIG. 4 is a concrete block diagram of the station selection signal, FIG. 5 is a block diagram of another embodiment of the station selection signal, and FIG. 6 is a time chart for explaining the operation. 1...Control device 2...Controlled device 3...
・Transmission level meter 4...Transmission line 41...Upstream transmission line 42...Downstream transmission line 51.511,51
2... Station selection signal 52 Station comparison circuit 53... Setting device 54... Display holding type level meter 55...
Comparison output 56...Station setting data 541...
・Display of display holding type level meter (K1532...Rotary switch (7317) Representative Patent attorney Kensuke Norichika (and 1 other person) Demon 1 figure Horse 2 figure Fan δ figure 4 figure ll Demon 5 figure 6 figure

Claims (1)

[Claims] In a remote monitoring and control device that uses a polling method that connects a control device and multiple controlled devices via a transmission path and sends and receives data from a specific controlled device based on commands from the control device, each controlled device a setting device that sets a value corresponding to the setting device; a station comparison circuit that compares a station selection signal output from the control device with the value set by the setting device; and a display holding type into which the output of the comparison circuit is introduced. What is claimed is: 1. A remote monitoring and control device comprising: a voltmeter; and measuring a transmission level only when a comparison result of a comparison circuit matches, and retains a measurement display when the comparison does not match.