JPH03129943A - Remote supervisory controller - Google Patents

Abstract

PURPOSE:To shorten the communication time of information by providing a transfer circuit for transferring a supervisory send-back signal from a slave station, to the slave station as it is on a master station, and collating the transmitting contents and the contents which makes the round of a transmission loop by the slave station. CONSTITUTION:For instance, in a slave station R1, when a transfer signal transferred and transmitted through a transfer circuit 12 from a master station 1 is received by a transmitting/receiving circuit 21, it is delivered to a collating circuit 22. In the collating circuit 22, the contents of a supervisory send-back signal transmitted before one cycle from the own station and the transfer signal transferred and transmitted from the master station 1 are collated. As a result, in the case it is satisfactory, a scan is advanced so as to transmit the next word of the present transmitting word by transmission of the next cycle, and in the case it is not satisfactory, preparations are made so as to retransmit the present transmitting word by the next cycle transmission, and retransmission is executed by the next cycle. In such a way, retransmission of a signal can be executed by the slave stations R1-Rn, and the communication time of information can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remote monitoring and control device that enables a master station to cyclically monitor a plurality of slave stations.

[Conventional technology]

FIG. 3 is a block diagram showing an example of the configuration of a conventional remote monitoring and control device. In the figure, (1) is a master station, and slave stations (R2) and ...(Rn
) is connected.

The master station (1) is the slave station (R1) (R2)/(Rn).
At the same time, the slave station (R
1) Consists of a transmitting/receiving circuit αυ that sequentially calls (R2)...(Rn) and cyclically monitors the slave station (R1).
) (R2)...(Rn) consists of a transmitting/receiving circuit υ that starts up in the time slot assigned to its own station in response to a calling signal from the master station (1) and transmits a monitoring return signal. ing.

Next, the operation will be explained. Figure 4(a) shows the master station (1
) in response to a call from slave stations (R1) (R2)...(R
In the case of cyclically sending back the monitoring signal from the master station (1), FIG. It is something.

In FIG. 4(a), the master station (1) calls the slave stations (R1) (R2)-(Rn) by the slave station calling signal (CX).
Each slave station is activated in the time slot assigned to it in response to the calling signal, and transmits the supervisory return signal of word 1. In the next cycle, the supervisory response signal for word 2 is transmitted, and then the supervisory response signals for words up to word n are transmitted, and the operation from word 1 is repeated again. Here,
The monitoring return signal for each word contains contents for code error testing (
For example, double inverted transmission, adjacent phase inversion, parity, etc.) are included, and the master station (1) performs a code error test to determine whether the code is good or bad. If the code is good, the sent monitoring return is sent. The signal is captured and processed, but if the signal is not received, the monitor return signal is discarded and processed at a good opportunity while being repeatedly transmitted.

Next, a case will be described in which a monitoring signal is returned using the reply verification method shown in FIG. 4(b).

The master station (1) receives a slave station call signal (CXt) from the slave station (R
1) Call. The called slave station (R1) first transmits a selection code to the master station (1), and the master station (1) transmits a return code corresponding to this selection code to the slave station (R1). The slave station (R1) performs a verification test by comparing the selection code and the returned code, and if the code is good, a monitoring command code is sent to the master station (R1), and if the code is not good, a remote control error code is sent to the master station (1). The master station (1) repeats these operations for the next slave station (R2)...(Rn), and once the transmission with the slave station (Rn) is completed, the master station (R2) returns to the slave station (Rn).
Repeat the operation from 1).

[Problem to be solved by the invention]

Conventional polling remote monitoring and control devices operate as described above, so the slave station that transmits the signal does not know the reception status of the code at the master station, and it takes time to communicate information. There were problems such as too much noise.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a remote monitoring and control device in which even a slave station can grasp the reception status of a master station.

[Means to solve the problem]

The remote monitoring and control device according to the present invention is a polling type remote monitoring and controlling device that monitors and controls each slave station in response to a call from a master station, in which a monitoring return signal from a slave station is sent directly to the master station. It is equipped with a transfer circuit for transferring data, and allows the slave station to compare the transmitted content with the content that has passed through the transmission loop.

[Effect]

The remote monitoring and control device according to the present invention allows the slave station (transmission side) to retransmit a signal by allowing the slave station to grasp the reception status of the master station.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is the master station, and the loop-shaped transmission path (1)
It is connected to slave stations (R1), (R2), . . . (Rn) via. The master station (1) is the slave station (R1) (R2).
...(Rn), and sends out a monitoring control signal for (Rn).
A transmitting/receiving circuit 0υ that sequentially calls and cyclically monitors the slave stations (R1, R2, ... (Rn), and
1) Consists of a transfer circuit (b) that directly transfers the monitoring return signal from (R2)...(Rn) to the five slave stations, and the slave stations (R1) (R2) - (Rn) are connected to the master station. (1) A transmitter/receiver circuit that activates in the time slot assigned to its own station in response to a call signal from the station and sends a monitoring return signal, and a check that matches the transmitted content with the content that has passed through the transmission loop. It consists of a circuit (a).

Next, the operation will be explained.

In FIG. 2, the master station (1) sends a slave station calling signal (CX
) is sent to the transmission path (1). Each slave station (R1) (R2)
... (Rn) receives the slave station calling signal (CX) at the transmitting/receiving circuit eυ, starts up in the time slot assigned to its own station, and transmits the supervisory return signal of word l to the master station (1). .

In the master station (1), when the transmission/reception circuit Ov receives this monitoring return signal, it passes it to the transfer circuit (6). In the transfer circuit @,
The received signal is checked for code errors, and if the received signal is good, the received signal 5 is transferred to the transmitter/receiver circuit Ql) as a transfer signal (RIT) to the handover station (R1). If the sign error test is not successful,
Replace only the data of the monitoring return signal with an idle code and transfer the signal (RIT) to the transmitter/receiver circuit aη to the slave station (R1)
Transfer and send. In the slave station (R1), when the transfer signal (RIT) transmitted from the master station (1) is received by the transmitter/receiver circuit Q, it is passed to the verification circuit (A). Verification circuit 4 receives the monitoring return signal (R1) sent one cycle ahead of its own station.
The content of word 1) is checked against the transfer signal (RIT) transferred from the master station (1), and if it is good, the next cycle is scanned to transmit the next word of the current transmission word. However, if not, preparations are made to retransmit the currently transmitted word in the next cycle transmission, and retransmission is performed in the next cycle. Hereinafter, (R2) . . . (Rn) also perform operations similar to the monitoring return signal transmission time. When the transmission of the monitoring return signal up to word n is completed, the transmission from word 1 is repeated again.

In the above embodiment, the return from the slave station is (R1) (R2)
...(Rn), but as long as (R1), (R2), ... (Rn) are returned within one cycle time, the order of the returns does not matter (for example, h...・R2
R1) The same effects as in the above embodiment are achieved. Also, regarding the monitoring return signal, word 1. Word 2. ...word n
Although the explanation was given in the order of
...Word 2. Word 1) Same effect as the above embodiment.

In the above embodiment, each slave station (R1) is sent from the master station (1).
(R2) . . . (Rn) has been described by calling all at once, but the same effect as in the above embodiment can be achieved by calling with a calling signal assigned to each slave station.

〔Effect of the invention〕

As described above, according to the present invention, the configuration is such that even the slave station can grasp the reception status of the master station, so it is possible for the slave station to retransmit the signal, thereby shortening the communication time and increasing the reliability of information. It has the effect of improving.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a remote monitoring and control device according to an embodiment of the present invention, FIG. 2 is a time chart explaining the invention in detail, and FIGS. 3 and 4 are (a) (b)
) A block diagram and a time chart of a conventional remote monitoring and control device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (3)

[Claims] (1) In a polling-type remote monitoring and control device that connects a master station and each slave station via a loop-shaped transmission line and monitors and controls each slave station in response to calls from the master station, the master station A transfer circuit that transfers the monitoring return signal sequentially transmitted by each slave station in response to a call signal from the master station to the slave station as it is, and the transfer signal from the master station and the monitoring return signal sent from the own station to the slave station. A remote monitoring and control device characterized by comprising a verification circuit for verifying signals. (2) In a polling-type remote monitoring and control device that connects a master station and each slave station with a loop-shaped transmission line and monitors and controls each slave station in response to calls from the master station, the master station A transfer circuit that transfers the monitoring return signal sequentially transmitted by each slave station in response to a call signal from the master station to the slave station as it is, and the transfer signal from the master station and the monitoring return signal sent from the own station to the slave station. 1. A remote monitoring and control device characterized by comprising a verification circuit that verifies the signals and, if the result of the verification is a discrepancy, transmits the monitoring return signal from the slave station again. (3) In a polling-type remote monitoring and control device that connects a master station and each slave station with a loop-shaped transmission path and monitors and controls each slave station in response to calls from the master station, the master station Each slave station receives the monitoring return signal sent sequentially in response to the call signal from the master station, tests the received signal for code errors, and if the test result is "good", transfers it as is to the slave station. If the answer is “No”, “
The transfer circuit sends the information "No" to the slave station, and compares the transfer signal from the master station with the monitoring return signal sent from the own station, and the result of this comparison is "Good".
A remote monitoring control device comprising: a verification circuit that performs normal operation when the result is "no" and transmits the monitoring return signal again when the result is "no".