JPH03106294A - Remote monitoring controller - Google Patents

Abstract

PURPOSE:To remove a delay factor for adjustment control and to improve control accuracy by registering a set value in a slave station device from a master station device, inputting measuring information from a terminal apparatus to the slave station device and comparing the inputted information with the set value. CONSTITUTION:When the set values of apparatus selection and control are applied from the master station, the set values are set up in a memory 210 of the slave station 2. When an adjustment control output is impressed from the slave station 2 to an apparatus 3 to be controlled, the apparatus 3 responds to the control output and its variation is inputted to the slave station 2 as measuring data and transmitted to the master station. On the slave station side, the measuring data in the adjustment control output are compared with the set value, the control output is continuously outputted independently of the switching operation of the master station side until the measuring value reaches to the set value, and when both the values coincide with each other, the slave station 2 stops the control output and transmits an adjustment control completion signal to the master station. Consequently, highly accurate adjustment control free from transmission delay can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote monitoring and control device that cyclically transmits data, and more particularly to a remote monitoring and control device suitable for adjustment control with zero transmission cycle delay.

[Conventional technology]

In conventional coordinated control, control commands are sent from a control center (hereinafter referred to as a master station) to a controlled station (hereinafter referred to as a slave station) via a communication line. The slave station outputs a continuous control signal while the master station is giving a command, and the control signal continuously controls, for example, an increase/decrease in the number of revolutions of a pump and the opening/closing of an electric valve. At this time, various physical quantities are used as measurement data and monitoring information is used as emergency data, which is subjected to priority interrupt processing on the slave station side and transmitted to the master station.

[Problem to be solved by the invention]

In general, a remote monitoring and control device consists of a master station 1, a slave station 2, and a controlled device (hereinafter referred to as a device) 3, as shown in FIG. The slave station 2 collects information on the equipment 3 and transmits it as a measurement and display signal to the master station 1, and the master station 1 transmits it to the slave station 2 as a control command and a control signal. Measurement in this case,
Display signals and control signals are generally transmitted cyclically. The transmission format of measurement, display symbols and control signals consists of a synchronization word followed by a data word.

Figure 4(a) shows the transmission format of the measurement/display signal, and Figure 4(b) shows the transmission format of the control signal. One cycle of the measurement/display signal is composed of one synchronization and n display data W1 to Wn as shown in Fig. 4(a), and the control W signal is composed of one synchronization word and n pieces of display data W1 to Wn as shown in Fig. 4(b). One control data word CWL constitutes one cycle.

On the other hand, the data transmission speed is 1200 b/s
In the case of the cyclic method adopted below, the data update period of the master station is about 50, and it takes about 2 seconds to 10 seconds.

Therefore, data collection that takes 2 to 10 seconds at the master station is not fatal for remote monitoring staff, but it is a serious problem when monitoring response data based on control commands. For this reason, in the case of coordinated control, in order to collect the control command operations at the master station and the corresponding monitoring data in the shortest possible time to achieve the best coordinated control, the monitoring for the coordinated control is usually written on the transmission format as shown in Figure 5. A method is used in which data is transmitted to the master station in a short period of time through interrupt processing.

However, even with priority transmission using interrupt processing, a transmission delay from the master station to the slave station and a transmission delay from the slave station to the master station inevitably occur. For this reason, the operator takes the time delay into consideration and ends the control command when the final target value reaches 90 to 95%. These have many experiential elements,
There is a problem with the system. In addition, if there is an abnormality in the communication line, normal adjustment control cannot be obtained, and the system is expensive because it can be dealt with by duplicating the hardware.

The present invention provides adjustment control that eliminates the above-mentioned drawbacks. [Means for Solving the Problem] When the master station provides device selection and control setting values, the slave station sets the setting values in memory. Next, when the slave station applies the adjusted control output to the controlled device, the device responds and the amount of change is captured as measurement data by the slave station and transmitted to the master station. Here, the slave station side compares the measurement data being outputted with +51!1 control and the set value, and continues outputting the control output regardless of the switch operation on the master station side until the measured value reaches the set value. By stopping the control output at this point and transmitting an adjustment control completion signal to the master station, highly accurate adjustment control without transmission delay can be obtained.

〔Example〕

Examples of the present invention will be described below. FIG. 3 shows a conventional system configuration. The basic monitoring and control functions of the remote monitoring and control device, as well as the accompanying signal processing, are well known and will not be described in the present invention.

The present invention relates to a slave station 2, and details of the slave station 2 are shown in FIG. Device selection signals and control signals from the master station are connected to a control verification circuit 202 via a communication line 4 and a demodulator 201. Check the quality of the data here, and if it is normal, the S/P converter 203
, a control output is applied to the controlled device 3 via the output section 204. On the other hand, the slave station 2 receives input data from the controlled device 3, and inputs it to the input section 209, and if it is measured data, it is sent to the A/D.
Through the conversion unit 208, the transmission format necessary for transmission,
．． It is connected to a logic control unit 207 which has functions such as flag processing, parity verification, and inverted continuous transmission processing. Further next P/S
The converter 206, modulator 205, and communication line 4 are connected to transmit data to the master station. The above is a description of a conventionally known slave station structure.

The present invention adds a set value memory section 210, an adjustment control mode detection section 211, a comparison detection section 212, and an adjustment control completion signal 214 to the above-described configuration.The operation of the illustrated circuit in FIG. 1 will be described below.

First, before performing the adjustment control operation, adjustment control setting values are set in the setting value memory section 210 from the master station side. A control command from a master station is verified by a control verification circuit 202 and is connected to an S/P conversion section 203 and an adjustment control mode detection section 201 when normal.

The adjustment control mode detection unit 211 detects whether the control input format of the master station is group selection (5Gm) or individual selection (5Gm) of equipment selection control.
5C2). The aforementioned selection bit pattern is determined in advance for the adjustment control items such as control (3Ca), and the same pattern is also set in advance for the control mode detection section. When it is determined that the bit pattern of the input signal is the same as the internal pattern, a detection signal is applied to the comparison detection section 212 to set the comparison detection section to an enabled state. At this time, the output section 204 outputs the control output in a continuous output state, and the controlled device 3
has started responding. In this state, the physical quantity of the controlled device 3 is taken in as measurement data, converted by the A/D converter 208, and then connected to the logic control unit 207. At the same time, it is connected to the comparison detection unit 212, and the set value memory unit 210 is stored. Compare it with the data, output the control output until it matches, and stop the control output at the same time, and the same adjustment control completion signal 21 will be generated.
4 is applied to the logic control unit 207 as monitoring data and transmitted to the master station. These series of processes are processed within the slave station via the communication line between the master station and the communication line, so it is possible to control the delay only by adjusting the response characteristics of the controlled device. The above contents are explained in the second section.
This is shown in the time chart shown in the figure. Therefore, according to this embodiment, the operator lowers the target value because the target value has been raised too much, as in the conventional adjustment control method. This eliminates the need for craftsman-like operations such as raising the value when it has been lowered too much, and can be operated using the same man-machine interface as for setting value control. Furthermore, since it is taken into consideration that errors due to transmission delays, which are the most problematic, will not occur during adjustment control, highly accurate adjustment control can be performed.

〔Effect of the invention〕

As described above, according to the present invention, the control accuracy of adjustment control can be improved.

[Brief explanation of drawings]

FIG. 1 is a diagram of a slave station configuration according to an embodiment of the present invention, FIG. 2 is a time chart of the present invention, FIG. 3 is a system configuration diagram of a conventional remote monitoring and control device, and FIG. FIG. 4(b) is a diagram showing the transmission format of the display, FIG. 4(b) is a diagram showing the transmission format of the control signal, and FIG. 5 is a diagram showing the transmission format of measurement and display by priority transmission during conventional adjustment control. 1... Master station, 2... Slave station, 3... Controlled device, 4
... Communication line, 201 ... Demodulator, 202 ... Control verification circuit, 203 ... S/P conversion section, 204 ...
Output section, 205... Modulator, 206... P/S conversion section, 207... Logic control section, 208... A/D conversion section, 209... Input section, 210... Setting Value memory section, 211... Adjustment control mode detection section, 212... Comparison detection section, 214... Adjustment control completion signal. Figure 1 Figure 3 Figure 4 Figure 2 Figure 5

Claims (1)

[Claims] 1. A remote monitoring and control device consisting of a combination of a master station and a station device is equipped with a memory that registers and records setting values in the slave station device through monitor operations from the master station device, and further controls adjustment via the master station device. The slave station device captures measurement information from a terminal device when carrying out the above, and includes a comparison detection unit that compares it with the set value, thereby eliminating delay elements in adjustment control that are accompanied by delays in transmission cycles. A remote monitoring and control device.