JP2519326B2 - Remote monitoring controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a remote monitoring control device capable of cyclically monitoring a plurality of slave stations from a master station.

[Prior Art] FIG. 3 is a block diagram showing a configuration example of a conventional distant monitoring control apparatus. In FIG. 3, (1) is a master station, which is a slave station via a loop-shaped transmission path (l). R1) (R2) ... (Rn)
Is connected to

The master station (1) sends a monitor control signal to the slave stations (R1), (R2), ... (Rn), and at the same time, the slave station (R1).
(R2) ... (Rn) is sequentially called and is composed of a transmission / reception circuit (11) for cyclic monitoring, and slave stations (R1) (R2)
.. (Rn) is configured by a transmission / reception circuit (21) that activates in the time zone assigned to the local station according to the call signal from the master station (1) and transmits a monitor return signal.

Next, the operation will be described. FIG. 4 (a) shows slave stations (R1) (R2) ... (R) in response to a call from the master station (1).
When the monitoring return signal from n) is cyclically returned, FIG. 4 (b) shows that the call from the master station (1)
The situation when the monitor signal is returned by the reply collation method is shown respectively.

In FIG. 4 (a), the master station (1) simultaneously calls the slave stations (R1) (R2) ... (Rn) by means of the slave station calling signal (CX), and each slave station calls its calling signal. According to the above, it is activated in the time zone assigned to its own station and transmits the monitoring return signal of word 1. In the next cycle, the supervisory return signal of word 2 is transmitted, and when the supervisory return signals up to word n are sequentially transmitted, the operation from word 1 is repeated again. Here, the monitoring return signal of each word includes the contents for code error verification (for example, double inversion transmission, adjacent transfer inversion, parity, etc.), and the master station (1) performs the code error verification. Then, the quality of the code is determined, and if the code is good, the sent monitor return signal is taken in, but if the code is not good, the monitor return signal is discarded and it is processed as a good miracle as it is repeatedly sent.

Next, the case where the monitor signal is returned by the reply collation method of FIG. 4 (b) will be described.

The master station (1) receives the slave station calling signal (CX1) and then the slave station (R
Call 1). The called slave station (R1) is first. The selection code is transmitted to the master station (1), and the master station (1) transmits the return code corresponding to this selection code to the slave station (R1). Child station (R
In 1), the selected code and the returned code are matched and verified. If the result is good, the designated code for monitoring is sent, and if not, the abnormal distance control code is sent to the master station (1). The master station (1) repeats these operations for the slave stations (R2) ... (Rn) in sequence,
When the transmission with the slave station (Rn) ends, the operation from the slave station (R1) is repeated again.

[Problems to be Solved by the Invention] Since the conventional polling distant monitoring control apparatus operates as described above, the slave station side transmitting a signal does not know the reception state of the code on the master station side. , There was a problem that it took too long to communicate information.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a remote monitoring control device that allows a slave station to grasp a reception state on the master station side.

[Means for Solving the Problems] A distant monitoring control device according to the present invention is a polling-type distant monitoring control device that monitors and controls each slave station in response to a call from the master station. In response to the call signal of the slave station in the signal, each slave station sequentially puts its own monitor return signal on the signal transmitted from the slave station and transmits it to the next station in sequence, and the master station receives this. A transfer circuit provided in the master station, which operates so as to transfer the monitor return signal of each slave station to the monitor control signal and transfer it to the slave station, and each slave station provided in the slave station and transferred from the master station It is equipped with a collation circuit that collates the corresponding portion of the monitor return signal of the local station with the previous monitor return signal transmitted from the local station, and if the collation result of both is good, a new signal will be added to the signal transmitted from the slave station. Transmit with the monitoring and return signal of your own station, and the verification result of both is not In this case, the signal sent from the slave station is added with the previous monitoring return signal sent from the own station and retransmitted.

In addition, the transfer circuit provided in the master station receives the signal sent from the slave station carrying the monitor and return signal of each slave station and verifies the sign error of the received signal of the monitor and return signal for each slave station. If the result is good, it operates so as to transfer it to the child station as it is. If not, it operates so as to give the information of the failure in the monitor return signal of the child station and transfer it to the child station. Is.

[Operation] In the distant monitoring control device according to the present invention, the transfer circuit provided in the master station operates so that the monitor return signal of each slave station is carried on the monitor control signal and transferred to the slave station. The matching circuit compares the corresponding part of the monitoring return signals of the slave stations transferred from the parent station with the previous monitoring return signal transmitted from the own station, and if the comparison result of both is good. , The new monitor return signal of the own station is added to the signal transmitted from the slave station and transmitted. If the verification result of both is negative, the previous monitor return signal transmitted from the own station is added to the signal transmitted from the slave station. Put it on and resend.

Further, the transfer circuit receives the signal transmitted from the slave station on which the monitor return signal of each slave station is placed, tests the sign error of the received signal of the monitor return signal for each slave station, and the result is If it is good, it operates to transfer it to the slave station as it is,
If the result is no, it operates so as to add the information about the failure in the monitor return signal of the slave station and transfer it to the slave station.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, (1) is a master station, which is connected to slave stations (R1) (R2) ... (Rn) via a loop-shaped transmission path (1). The master station (1) has the above-mentioned slave stations (R1) (R2) ...
To (Rn), the supervisory control signal as shown in the master station signal of FIG. 2 to be described later is transmitted, and the slave stations (R1) (R
2) ... (Rn) is called in sequence to send / receive circuit (11) and the slave stations (R1) (R2) ... (Rn)
Consists of a transfer circuit (12) that transfers the monitor return signal from the slave station to the slave station as it is, and the slave stations (R1) (R2) ... (Rn)
Is a transmission / reception circuit (21) that activates a signal transmitted from a slave station in a time zone assigned to itself in response to a calling signal from the master station (1) and transmits a monitor return signal to the next station.
And a collating circuit (22) for collating and collating the transmitted contents and the contents that have passed through the transmission loop.

 Next, the operation will be described by taking the slave station (R1) as an example.

In FIG. 2, the master station (1) sends a supervisory control signal such as the master station signal of FIG. 2 having a slave station calling signal (CX) to the transmission line (l). Each slave station (R1) (R2) ...
(Rn) receives the slave station calling signal (CX) at the transmitter / receiver circuit (21), and the time assigned to itself is the signal transmitted from the slave station as shown in the slave station signal in FIG. It starts up in the band, carries the monitoring return signal of the word 1 of its own station, sends it to the next station via the transmission line (l), and sends it to the master station (1). In the master station (1), when the monitor / return signal is received by the transmission / reception circuit (11), it is passed to the transfer circuit (12). In the transfer circuit (12), the received signal is tested for sign error, and if it is good, the received signal is passed as it is to the transmitter / receiver circuit (11), and the transfer signal (R1T) to the slave station (R1) is added to the monitoring control signal. To send. If the code error test is denied, replace only the data of the monitor return signal of the slave station with an idle code and pass it to the transmission / reception circuit (11), and put the transfer signal (R1T) on the monitor control signal to the slave station (R1). Send. In the child station (R1), the parent station (1)
When the transmission / reception circuit (21) receives the transfer signal (R1T) transmitted by the transmission, the transmission signal is passed to the matching circuit (22). In the matching circuit (22), the contents of the monitor return signal (R1 word 1) transmitted one cycle ahead from the own station and the transfer signal (R1T) transferred and transmitted from the master station (1) are matched and matched.
If yes, proceed to send the next word of the last transmitted word in this cycle's transmission, but if not, prepare to retransmit the last transmitted word in this cycle's transmission and retransmit in this cycle. I do. Below (R2) ...
(Rn) also performs the same operation when transmitting the monitor return signal. When the transmission of the monitor return signal up to word n is completed, the transmission from word 1 is repeated again.

In addition, in the above-described embodiment, the word for the monitor return signal is
Although the description has been made in the order of 1, word 2, ... Word n, it is sufficient that all of the returns are finally performed. Has the same effect as.

[Effects of the Invention] As described above, according to the present invention, the matching circuit provided in the slave station transmits from the self station the corresponding portion in the monitor return signal of each slave station transferred from the master station. Since it compares with the previous monitor return signal, the slave station can also know the reception status of the master station, and the slave station side can judge the necessity of retransmission, and also send or retransmit the monitor return signal to the master station without delay. it can. Therefore, there is an effect that information can be transmitted and received efficiently without waste.

Further, the transfer circuit of the master station receives the signal transmitted from the slave station carrying the monitor return signal of each slave station, and tests the code error of the received signal of the monitor return signal of each slave station, If the result is good, it operates so that it is transferred to the child station as it is. If not, it operates so as to transfer the information to the child station by giving the information of the failure in the monitor return signal of the child station. When an abnormality occurs in transmission and reception, there is an effect that the slave station can distinguish between an abnormality in transmission from the slave station to the master station and an abnormality in transmission from the master station to the slave station.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a distant monitoring control apparatus according to an embodiment of the present invention, FIG. 2 is a time chart for explaining the operation of the present invention, and FIGS. 3 and 4 (a) (b). FIG. 3 is a block diagram and time chart of a conventional remote monitoring control device. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazunori Onishi 1-6-20 Sanmuro, Misato-cho, Ikoma-gun, Nara (72) Inventor Hirofumi Morimoto 1-2-1 Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Inside the Electric Works Co., Ltd. (72) Inventor Naoki Murata 1-2 1-2 Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Inside the Mitsubishi Electric Corporation Control Works (72) Shingo Yamane Wadazaki, Hyogo-ku, Kobe-shi, Hyogo Prefecture 1-2 1-2, Mitsubishi Electric Co., Ltd. Control Works (72) Inventor Ryoji Tokunaga 1-2-1, Wadazakicho, Hyogo-ku, Kobe, Hyogo Prefecture Naoki Yazu (56) Examiner, Mitsubishi Electric Co., Ltd. References JP-A-53-3004 (JP, A) JP-A-63-206043 (JP, A)

Claims (2)

(57) [Claims] 1. A polling-type distant monitoring control apparatus for connecting a master station and a plurality of slave stations by a loop-shaped transmission line, and monitoring and controlling each slave station according to a call from the master station, In response to the call signal of the slave station in the supervisory control signal transmitted from the station, each slave station sequentially transmits the monitor return signal of its own station to the signal transmitted from the slave station and sequentially transmits it to the next station, This is received by the master station, the transfer circuit is provided in the master station, and operates to transfer the monitoring control signal of each slave station to the slave station by adding the monitor return signal of each slave station, The slave station is provided with a collating circuit for collating the corresponding portion of the supervisory return signals of the slave stations transferred from the master station with the previous supervisory return signal transmitted from the slave station. If the verification result of is good, the signal transmitted from the above slave station is newly added. It is characterized by transmitting by transmitting the monitoring return signal of its own station, and if the comparison result of both is negative, the signal transmitted from the slave station is added with the previous monitoring return signal transmitted from the own station and retransmitted. Remote monitoring and control device. 2. A transfer circuit provided in a master station receives a signal transmitted from a slave station carrying a monitor return signal of each slave station, and receives a signal of the monitor return signal for each slave station. If the code error is verified and the result is good, it operates so as to transfer it to the slave station as it is. If not, it gives the information of the failure in the monitor return signal of the slave station and transfers it to the slave station. 2. The remote monitoring and control device according to claim 1, wherein