JPS5925436B2 - Duplex remote monitoring and control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a 2:N duplex remote monitoring and control device, and in particular, the present invention relates to a 2:N duplex remote monitoring and control device, and in particular, from (-, 1) mode during selective measurement to (1) mode during selective control.
, N-1) mode, the data collection delay of up to one frame which conventionally occurs is prevented.

Conventionally, N slave stations were assigned to one master station.
In the N-type remote monitoring F5L leg unit (hereinafter also abbreviated as teleconverter), when duplicating the master station and configuring a so-called 2:N-type teleconverter system, the configuration shown in Figure 1 is adopted. There is.

In Figure 1, 1 indicates an external command device such as a computer, and 2
is a duplex master station device, 3-(ni-1, 2, . . .
, N-1) and 3-N are the th and Nth respectively.
Indicates the th slave station. The master station device 2 has master stations 4 and 5 and a line switching circuit 6 having the same configuration. The master stations 4 and 5 are
A station selection command circuit 7 that operates based on a command from the external command device 1 and generates the address of the selected slave station.
, a master station transmitting circuit 8 is supplied with the remote control output from this station selection command circuit 7 and sends it to the slave station via the line switching circuit 6, and the data collected by the slave station is sent to the line switching circuit 6. The line switching circuit 6 is controlled by the station selection command output of the station selection command circuit 7, that is, the address output, and the line switching circuit 6 is connected to the master station. Decide whether to connect to a slave station. The computer 1 always knows the address of the slave station selected by the station selection command circuit □ of the master stations 4 and 5, and when switching to the selection control mode, which master station 4 is selected for the slave station to be controlled. , 5 shall be used to indicate whether to share the work. Furthermore, the slave station (for example, 3-) includes a slave station receiving circuit 10 that receives the transmission output from the master station, and a slave station receiving circuit 10 that verifies whether or not its own address has been received based on the reception output of the receiving circuit 10. It has an address verification circuit 11, a transmission command circuit 12 that generates a transmission command in response to a verification output from the address verification circuit 11, and a slave station transmission circuit 13 that transmits slave station data in response to a command from the transmission command circuit 12. In the duplex far-reaching device with the above configuration, in order to achieve efficient operation, both master stations 4 and 5 are used, and at the time of selective measurement, both master stations 4 and 5 correspond to the number of target slave stations N. In many cases, a method is adopted in which each unit is divided into halves, that is, one unit at a time, but when either the master station 4 or 5 performs selective control on an arbitrary slave station, for example, the master station 4 performs selective control. When performing this, it is common for the master station 5 to selectively measure the remaining slave stations (N-1).

In this case, there are two ways to operate the duplex teleconverter: (1) Upstream signals from the slave stations to the master station are always transmitted at all slave stations, and the data received at the master station is arbitrarily switched and added to the computer.

(2) The master station issues an uplink signal transmission command to only an arbitrary slave station and calls it, and from that point on, the reception of the upstream signal of the target specific slave station is started.

These methods (1) and (2) have the following problems.

In the case of (1): Since the timing of transmitting the uplink signal from the slave station and the timing of switching reception at the master station are asynchronous, it is necessary to wait until the synchronization word of the upstream signal is received. Since this requires a reception standby period of one frame on average, data cannot be collected quickly after the mode is switched.

Case (2): By calling the slave station from the master station, the timing of transmission and reception is synchronized between the master station and the slave station, and data transmission from the target slave station to the master station is started.
There is no reception standby state as in case 1).

However, in a 2:N duplex teleconverter, when switching from (mode to (1, N-1) mode, 1N is the master station whose slave station division changes from 1 to (N-1)). If the slave station (for example, the k-th slave station) that the slave station (for example, the k-th slave station) that the master station 4 in FIG. Then, since the k-th slave station has already started transmission, the master station 4 is in a standby state to receive the uplink signal from the k-th slave station until the transmission is completed. will occur,
As in case (1), there is a delay of one frame at maximum and -frame on average, making it impossible to collect data quickly.

SUMMARY OF THE INVENTION In view of the above-mentioned points, an object of the present invention is to prevent data collection delays when switching modes in a 2:N duplex teleconverter. A switching verification circuit is provided in each of the master station and the slave station to quickly synchronize the master station and the slave station at the time of mode switching.

In order to achieve such an object, the present invention provides a 2:N type duplex remote monitoring and control device in which a master station is duplicated and N slave stations are assigned, and each master station is provided with a selection measurement mode. A mode switching circuit is provided that sends a mode switching signal to the corresponding slave station when switching to the selection control mode, and each slave station is supplied with the mode switching signal sent from the master station, and the slave station A mode switching command circuit is provided that generates a mode switching command signal to stop transmitting station data.

The present invention will be described in detail below with reference to the drawings. FIG. 2 shows an example of the configuration of a duplex teleconverter according to the present invention. Here, parts corresponding to those shown in FIG. 1 are given the same reference numerals and their explanations will be omitted. In FIG. 2, master stations 4 and 5 are each connected to each other by a signal line 21, monitor which slave station is selected by the other master station, and decide which slave station to use based on the selection status. The master station determines whether to perform 1:1 selection control with a specific slave station, and accordingly generates a mode switching signal, and at the same time, the master stations 4 and 5, depending on the mode after mode switching, A station selection control circuit 22 that generates an address signal specifying which slave station is to be subjected to selective control or selective measurement, and a mode that is supplied with a mode switching signal from the control circuit 22 and generates a mode switching command signal. It has a switching command circuit 23. The address signal from the control circuit 22 described above is supplied to the transmitting circuit 8 in the same manner as in the prior art. At the time of mode switching, a mode switching command signal from the mode switching command circuit 23 is sent from the transmitting circuit 8 to the slave station. That is, during normal selection measurement, the transmitting circuit 8 accommodates the designated address from the station selection command circuit 22 in a frame and transmits it, but when the switching command signal is generated, it sends out this switching command signal with priority. Furthermore, in FIG. 2, slave stations 3-K, 3-
N has a self-address verification circuit 11 after the receiving circuit 10.
A mode switching verification circuit 24 is also connected thereto to receive the above-mentioned mode switching command signal. This mode switching verification circuit 2
4 is connected to the transmitting circuit 13, and when the mode switching command signal is generated, a transmission stop command is applied to the transmitting circuit 13 to immediately stop transmitting the upstream signal. In addition to stopping the transmission of the uplink signal in this way, in the master station 4, at the same time that the mode switching signal is applied from the station selection command circuit 7 to the mode switching command circuit 21, the station selection command circuit 22 sends the mode switching signal to the parent station to which it belongs. Depending on the selection mode of the station, an address signal of a slave station to be subjected to selection control or selection measurement is generated and supplied to the transmitting circuit 8. Therefore, upon receiving the mode switching signal, the selected slave station immediately stops transmitting uplink signals, and the downlink signal for the slave station selected from the master station is sent along with the address of the slave station. Synchronization between the master station and the slave station is established immediately after the data is sent, and it does not take one frame on average or one frame at maximum to achieve synchronization as in the past. As described above, in the present invention, by providing a mode switching command circuit in the master station and installing a mode switching verification circuit in the slave stations, the mode changes from (1 -) mode during selection measurement to (1, 1, 2) during selection control. Since synchronization between the master station and the slave station can be established immediately when switching to the N-1) mode, there is no delay in data collection.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the system configuration of a conventional duplex teleconverter, and FIG. 2 is a block diagram showing an example of the system configuration of the duplex teleconverter according to the present invention. 1... Computer, 2... Master station device, 3-
K, 3N...Slave station, 4,5...Main station,
6... Line switching circuit, 21... Signal line, 22... Station selection control circuit, 23...
Mode switching command circuit, 24...Mode switching verification circuit.

Claims (1)

[Claims] 1. Do not duplicate the master station and assign N slave stations. 2: In the N-type duplex remote monitoring and control device, each master station has the corresponding slave stations when switching from the selective measurement mode to the selective control mode. The station is provided with a mode switching circuit that sends a mode switching signal, and each slave station is supplied with the mode switching signal sent from the master station, and a mode switching command signal that stops sending slave station data to the master station. What is claimed is: 1. A dual remote monitoring and control device comprising a mode switching command circuit that generates a mode switching command circuit.