JP2506669Y2 - Analog setting device for remote monitoring control - Google Patents

Description

[Detailed Description of the Device] A. Field of Industrial Application The present invention relates to an analog setting device for setting an analog value for controlling a monitored device in remote monitoring control, and particularly relates to an analog value increase / decrease command. The present invention relates to a method of setting an analog value by setting at a station and transmitting this increase / decrease command from a master station to a slave station.

B. Outline of the Invention The present invention controls the monitored device by setting an analog value increase / decrease command in the master station and transmitting this analog value increase / decrease command from the master station to the slave station in the remote monitoring control. In the analog setting device that sets the analog value for setting, the increase / decrease command pulse indicating the increase / decrease amount of the analog value in pulse number is used as the analog value setting command to be transmitted from the master station to the slave station. In addition to recognizing the analog value with the down counter, the master station checks the analog value after setting with the up / down counter for monitoring and the display unit, regardless of the transmission speed or the response speed of the slave station. The new analog value can be confirmed in real time.

C. Conventional Technology Generally, a remote monitoring device is composed of a master station that centrally controls target equipment and a slave station that controls a device under its control based on a command from the master station. Each device can be automatically operated by issuing a command from the master station to the slave station.

In recent years, remote monitoring devices are becoming widespread in control systems of water treatment facilities, and have been introduced to small-scale facilities such as booster pump stations and relay pump stations. Along with this, it is desired to reduce the capacity of the device.

When controlling the operation of devices such as pumps, it is necessary to set numerical values (analog or BCD) such as rotation speed at the master station.

The numerical value is set by a numerical value increase / decrease command in order to deal with a large number of control items with a small capacity.

D. Problem to be solved by the invention As described above, in the case of the mode of performing the numerical value setting by the increase / decrease operation, since only the increase / decrease command is transmitted to the slave station, in order to confirm the set numerical value itself, You need to have an answer back from the child station.

For this reason, during the numerical value setting operation, the response was delayed due to transmission delay and the like, and the operability was deteriorated. This point was an obstacle to reducing the capacity and increasing the number of items.

In view of such a problem, the present invention controls a monitored device by setting an analog value increase / decrease command in the master station and transmitting this increase / decrease command from the master station to the slave station in the remote monitoring control. In the device that sets the analog value for
The purpose is to improve the responsiveness of the increase / decrease command and improve the operability.

E. Means and Actions for Solving the Problems According to the present invention, the setting of the analog value is performed by inputting an increase / decrease command of the analog value.

For example, when setting the analog value to a value larger than the present value, the analog increase / decrease command input section is operated to input the analog increase command.

This analog increase command is converted into an increase command pulse synchronized with the transmission cycle by the increase / decrease command pulse generator,
It is transmitted to the slave station by the transmitter.

The slave station can detect the increase command pulse according to the transmission cycle. Here, the slave station side is provided with an up / down counter that holds a numerical value corresponding to the current analog value. With this up / down counter,
By counting up the number of received increase command pulses, the current analog value is increased by a predetermined amount,
It is possible to recognize the numerical value corresponding to the newly set analog value.

The recognized numerical value is converted into an analog value by the digital / analog converter and used for controlling the monitored device.

On the other hand, the master station side is equipped with the same up / down counter for monitoring as the slave station side. This up / down counter receives the increase / decrease command pulse output from the increase / decrease command pulse generation unit
Performs the same counting operation as the counter. Therefore, in this case, the up / down counter on the master station side counts up by the number of increase command pulses.

By displaying the numerical value output by the up / down counter on the display unit, the newly set analog value can be displayed in real time.

F. Example An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a main part of a remote monitoring and control system according to an embodiment of the present invention.

This remote monitoring and control system is composed of a master station 1 and a slave station 2, and the master station 1 and the slave station 2 are connected by a transmission line 3.

The master station 1 performs the main control of the system, and is provided with an analog value setting section 4, an input section 5, and a display section 6.

The analog value setting unit 4 is for setting an analog value command to the slave station 2, and is a pulse synchronization circuit 4-1.
An instruction up / down counter 4-2, a memory 4-3, and a signal switching unit 4-4.

The pulse synchronization circuit 4-1 synchronizes the increase command and the decrease command input from the input unit 5 with the transmission cycle.
The instruction up / down counter 4-2 counts by inputting the increase instruction pulse and the decrease instruction pulse output from the pulse synchronization circuit 4-1. Memory 4-3
Stores the answer back signal from the slave station 2. The signal switching unit 4-4 uses the answer from the slave station 2.
The input of the back signal to the display unit 6 is switched.

The input unit 5 includes an increase instruction switch 5-1, a decrease instruction switch 5-2, and a fast mode instruction switch 5-3. The increase instruction switch 5-1 and the decrease instruction switch 5-2 are for inputting an increase command and a decrease command. The first mode instruction switch 5-3 is for switching the input mode of the increase command and the decrease command.

The display unit 6 displays an analog value and includes a set value display unit 6-1, a setting answer display unit 6-2, and a process value display unit 6-3.

The set value display unit 6-1 displays the input set value when setting the analog value. The setting answer display section 6-2 displays answers from the slave station 2 when analog values are set.
The backed setting value is displayed. The process value display unit 6-3 displays the process value transmitted from the slave station 2.

The slave station 2 has a transmission function necessary for monitoring and control operations, and is provided with a control unit 7 that monitors and controls the monitored device 8 under its control in accordance with a command from the master station 1. The control unit 7 includes a setting up / down counter 7-1 and a signal switching unit 7-2. Up / down for setting
The counter 7-1 receives the increase instruction pulse and the decrease instruction pulse received and performs a counting operation.

The detector 9 detects a process value from the monitored device 8.

 Next, the operation of this system will be described.

When setting and changing the command value (analog value) to the monitored device 8 in the master station 1, the input unit 5 is operated to instruct a new analog value.

For example, when setting the analog value to a value larger than the present value, the increase instruction switch 5-1 is pressed. As a result, the increase command is output from the input unit 5 to the pulse synchronization circuit 4-1.

FIG. 2 is a diagram for showing the operation of the pulse synchronization circuit. (A) shows a transmission cycle, (b) shows an increase command, (c) shows an increase command pulse, and (d) shows. The decrease command is shown, and (e) shows the decrease command pulse.

The pulse synchronization circuit 4-1 generates an increase command pulse by synchronizing the increase command with the transmission cycle. This increase command pulse is output to the master station 1 and transmitted to the slave station 2 as 3-bit downlink control bit data.

The increase command pulse received by slave station 2 is
It is output to the down counter 7-1.

FIG. 3 shows the input / output of the setting up / down counter.

The setting up / down counter 7-1 counts by inputting an increase command pulse and a decrease command pulse. The output stage of the setting up / down counter 7-1 is provided with a digital / analog converter, and outputs an analog value corresponding to the count value.

When the increase command pulse is input, the setting up / down counter 7-1 counts up by the number of pulses, and thereby the command value (analog value) output to the monitored device 8 is set / changed. To be done.

On the other hand, in the master station 1, the increase command transmitted to the slave station 2 is monitored by the instruction up / down counter 4-2. Like the setting up / down counter 7-1, the instruction up / down counter 4-2 counts by inputting an increase command pulse and a decrease command pulse. It holds the same numerical value as the counter 7-1.

The numerical value output by the instruction up / down counter 4-2 is displayed on the set value display section 6-1. Since the set value display section 6-1 can display the analog value in real time in response to the operation of the input section 5, a quick setting operation can be performed.

Further, when setting the analog value, the signal switching units 4-4 and 7-2 are switched from the process value side to the set value side by the control of a timer (not shown), and answer back of the set value is performed.

The analog value answered back from the slave station 2 is displayed by the setting answer display section 6-2. This analog value is stored in the memory 4-3 even after the timer times out.
And is continuously displayed on the setting answer display section 6-2.

When the timer times out, the signal switching unit 4-4, 7-
2 is restored, and the process value from the detector 9 is displayed on the process value display unit 6-3.

Further, in this embodiment, when the increase / decrease command is input, the normal mode and the fast mode can be selected.
When the increase / decrease amount is large, the fast mode instruction switch 5
By pressing -3 and selecting the first mode, a large increase / decrease amount can be instructed by the same operation. The instruction up / down counter 4-2 and the setting up / down counter 7-1 receive the fast mode command to switch the output change amount per input pulse to perform counting.

G. Effect of the Invention As described above, according to the present invention, the master station side is provided with the same up / down counter as the slave station side for monitoring, and the up / down counter outputs. By displaying the numerical value on the display,
The newly set analog value can be displayed in real time.

Therefore, it is not necessary to wait for the answer back from the slave station to check the set analog value as in the past, and it is not limited to the transmission speed between the master station and the slave station or the response speed of the slave station, There is an advantage that various setting operations can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a remote monitoring control system according to an embodiment of the present invention, FIG. 2 is a time chart showing the operation of a pulse synchronization circuit, and FIG. 3 is a setting up / down counter. It is explanatory drawing which shows input / output. 1 ... Parent station, 2 ... Slave station, 4-1 ... Pulse synchronization circuit, 4-2
... instruction up / down counter, 5-1 ... increase instruction switch, 5-2 ... decrease instruction switch, 6-1 ... set value display section, 7-1 ... setting up / down counter, 8
… Monitored equipment.

Claims (1)

(57) [Scope of utility model registration request] 1. A master station that centrally controls target equipment, and a slave station that is located far from the master station and that controls a monitored device under the control of the master station via a transmission line. A device that sets an analog value increase / decrease command in the configured remote monitoring device in the master station, and sends this increase / decrease command from the master station to the slave station to set the analog value for controlling the monitored device. At the master station, an analog increase / decrease command input section for inputting an increase / decrease command indicating an increase / decrease in analog value, and based on this increase / decrease command,
An increase / decrease command pulse generation unit that generates an increase / decrease command pulse that is synchronized with the transmission cycle of information transmission between the master station and the slave station, and a transmission unit that transmits this increase / decrease command pulse to the slave station are provided. From the receiver that receives the increase / decrease command pulse transmitted from the
Up or down to count up or down
A counter and a digital-to-analog converter that converts the output of the up / down counter into an analog value and outputs the analog value to the monitored device are provided.In addition, the master station has the same up / down counter as the slave station. Based on the output of the up / down counter, the analog value is displayed in real time according to the increase / decrease command operation of the analog increase / decrease command input section, and the analog value answered / backed from the slave station is displayed for a certain period of time. An analog setting device for remote monitoring control, further comprising: a display unit for displaying a process value after a lapse of a certain time.