JP2617793B2 - Centralized monitoring and control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a centralized monitoring and control device provided for centralized monitoring and control of controlled devices such as air conditioners which are arranged in a distributed manner. The present invention relates to an improvement of a centralized monitoring and control device for transmitting and receiving monitoring and control data between one master station and a plurality of slave stations by a polling / selecting method.

(Prior art and its problems) For example, when centrally monitoring and controlling a plurality of devices arranged in a distributed manner such as an air conditioner in real time, the master station operates each device via a slave station attached to each device. A polling / selecting system is used which sequentially receives and inquires about status or monitoring detection data and performs control according to a change in the data. In this polling / selecting method, the master station (centralized monitoring control station) has the right to use the control transmission line, and each slave station (controlled station) receives the polling from the master station only when the master station receives polling from the master station. Data can be transmitted to the station.

However, in such a method, an abnormal situation occurs in the distributed equipment, and even if the slave station wants to transmit data urgently notifying the status change to the master station, it takes time to wait for polling from the master station. It takes a long time for the master station to detect an emergency situation, and the corresponding control data is too late to reach the equipment and the installation location of the equipment, making it difficult to minimize damage. .

For example, if the communication speed is 9600 bps and the number of slave stations is 32 for one master station, if the calling and answering time per slave station is 200 msec, a maximum of 200 mesc is required to make a round of all slave stations. × 32 = 6.4sec time is required. The time required for the master station to detect the contents of the occurrence of the abnormality is always required to be within 0.5 seconds for all 32 slave stations, and 0.3 seconds is required as the effective value of the actual device. That is, it is required to reduce the time by about 1/10 as compared with the related art.

As a countermeasure to reduce the time, it is conceivable to increase the polling speed by increasing the data transmission speed, but in that case, expensive computers and transmission equipment are required, and the disadvantage that the equipment cost does not economically match the actual situation. there were.

(Object of the Invention) An object of the present invention is to reduce the time required for a master station to detect the occurrence of an abnormality in a plurality of controlled devices distributed as described above,
It is an object of the present invention to provide a centralized monitoring and control device capable of performing control for stopping damage caused by occurrence of an abnormality to a minimum.

(Configuration and Operation of the Invention) A centralized supervisory control device of the present invention is a supervisory control data transmission line between a parent station, which is a centralized control station of a polling / selecting system, and a slave station connected to a controlled device that is distributed and arranged. Separately, a state change control line (CHANGE OF STATUS line, hereinafter abbreviated as COS line) is installed along with the transmission line, and
The transmission speed of the control data of the transmission line remains the same as COS
The present invention is characterized in that a line connection configuration and a timing of a control signal for setting the transmission speed of emergency data of a line to be high are realized.

 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an outline of a configuration example of the present invention. In the figure, reference numeral 1 denotes a master station, that is, a centralized monitoring control station. Reference numeral 2 denotes a slave station, which is a controller including an indoor unit controller 5 and an outdoor unit controller 6 for controlling an indoor unit 7 and an outdoor unit 8 which are controlled devices. The slave stations 2 are respectively provided at N controlled devices and are connected to the master station 1 by a transmission line 3 for normal control. Reference numeral 4 denotes a COS line for emergency control added according to the present invention. The indoor unit 7 and the outdoor unit 8 of the controlled equipment are suitable for each installation location, and there are actually some differences, and accordingly, the indoor unit controller 5 and the outdoor unit controller 6 also have a corresponding partial difference. However, since they do not affect the gist of the present invention, they are shown as the same in the drawings. The number of slave stations 2 is N,
Often less than 100 stations.

FIG. 2 is a flowchart of the mutual operation of the master station 1 and the slave station 2 of the present invention using the above-mentioned COS line 4, and FIG. 3 is a flowchart showing the processing flow of the master station 1. Fig. 1 ~
The operation of the present invention will be described with reference to FIG.

The centralized monitoring control in the normal state where no abnormality occurs is sequentially performed between the plurality of slave stations 2 and the master station 1 in accordance with the station number of the slave station 2 by a polling method. That is, after establishing a data link with each slave station 2, a series of data texts are transferred to the master station 1.
Is received (steps 32 and 33 in FIG. 3). On the other hand, when transmitting the data text from the master station 1 to the slave station 2, the data text is transmitted by the selecting method. Therefore, a certain period of time is required until an abnormality occurs in any of the slave stations 2 and the failure information data is received. However, as shown in FIG. 1, the COS line connected to the data transmission line 3 causes the failure information data to be transmitted for a short time (0.5s
within EC). That is, when an abnormality occurs in the slave station, the slave station turns on the COS line 4 and notifies the master station 1 of a state change (COS) at high speed by the COS line 4 separately from the normal control line 3. Upon detecting the COS, the master station 1 immediately transmits global polling to all slave stations. All the slave stations that have received the global polling respond to the address of the own station and the response data indicating the presence or absence of an abnormality in order, and the master station receives the response data and detects the abnormal occurrence station. The master station activates the abnormality processing program, performs polling with priority to the abnormality occurrence station, and receives failure information data as a response. Then, abnormal processing corresponding to the failure situation is immediately performed. (For example, a backup process for abnormal heating of the exchange is performed as the abnormal process.)
Thus, by adding the COS line 4, the control line 3
The master station was able to receive the failure information data within 0.5 seconds without increasing the communication speed of the conventional system, and immediately started the abnormality processing program to enable effective processing.

As described above, the present invention employs the global polling method using the COS line in addition to the polling method and the selecting method for performing normal control and monitoring.

In this global polling method, the master station, which has been notified from the slave station in which the status change (occurrence has occurred) by the COS line 4, performs emergency polling for all the slave stations in a short time, and performs an abnormal process for the slave station. Is a method that executes
The following functions are provided. That is, (1) COS signal: occurrence of abnormality in slave station, that is, state change (CHA
NGE OF STATUS) is a status change signal output by the slave station. When the control input of the controlled device controlled by the slave station 2 and the detection output for monitoring the state exceed a predetermined value, the COS signal is output, and the COS signal is output via the COS line 4 (state change notification line). Send to master station 1.

(2) Global polling: Polling that is activated when the master station 1 receives a COS signal from the slave station 2 in which an error has occurred. Each slave station responds to the global polling (sending of ACK or NAK to be described later) after (local address-1) × n msec from the time of receiving this global polling or before the local station address. When receiving the message, it sends the number of its own station (indicating the station address and called SA) and ACK (with abnormal information) or NAK (without abnormal information) indicating the presence / absence of abnormal information. Receives and collects the response message of global polling from. Then, the COS text (state change data) is transmitted in a polling sequence to the slave station that has responded to the ACK. Slave station 2 turns off the COS signal after transmitting the COS text
And However, nmsec: (SA + ACK / NAK) transmission time +
Communication interval gap.

The outline of the above operation will be described in more detail. FIG. 4 is a general operation flowchart of the present invention, showing the operations related to the above-described selecting sequence, polling sequence, and global polling sequence. 5 to 7 are flowcharts each showing the details of the partial operation of FIG.

First, FIG. 4 will be described. After the control is started, it is determined in step 401 whether or not there is a COS (state change). If not, it is determined in step 402 whether the COS signal is ON or OFF. CO
If the S signal is OFF, it is determined in step 403 whether or not there is a transmission text. If yes, the control is performed in accordance with the selecting sequence 41. Step 4
When there is no transmission text in 03, the current (normal) AC (slave station) number is fetched and the flow proceeds to the polling sequence 42.

If the COS signal is ON at step 402, the global polling sequence 43 is shifted to and after completion, the COS (state change)
Save the AC number with. Steps after control start
If there is a COS in 401, an AC number with a COS is taken out 46 and the process proceeds to the polling sequence. In any case, after executing the final sequence, the process returns to step 401.

When an abnormality occurs and the COS signal is ON, a global polling sequence 43 shown in FIG. 5 is performed. That is, global polling is performed (step 51).
SA / ACK (with station address and fault information) is received (step 52), and if it is not the final AC (slave station) in step 53, SA / NAK (without station address and fault information) from the slave station with no error Is received, step 54 goes round all the slave stations, reaches the final AC (slave station), transmits EOT (end), and ends (step 55).

Next, the selecting sequence 41 and the polling sequence 42 shown in FIG.
In 1, the global polling (GP) 63 requests the station status from all the slave stations (step 64), and determines whether or not each AC is in an online state. Next, online slave station (AC)
A set value transmission 62 is performed in response to the selecting sequence (S) 66 (step 67).

Next, a scan 69 for collecting the set value data of all the slave stations is executed, and polling processing is performed on the slave stations responding by global polling, and measurement of temperature, pressure, current, etc., which are response data from the slave stations, is performed. Collects the value and setting value data.

Next, take out the current AC No. 44, COS shown in FIG.
The AC No. save 45 with COS and the AC No. extraction 46 with COS will be described with reference to FIG. FIG. 7 shows an example in which the number of slave stations (AC) connected is 16. Reference numeral 71 denotes an SA table (station address table) which is used to retrieve the slave station number to be polled this time. Reference numeral 72 denotes a COS table, which sets a flag (Flag) in a corresponding slave station (AC) to which an AC / ACK response indicating an abnormal occurrence has been received from the slave station (AC) by global polling. In the AC No. taking out 46 with COS, the flag is retrieved from the COS table 72, the corresponding slave station (AC) is taken out, the polling target is specified this time, and the polling sequence 42 is executed.

The above has mainly described the operation of the master station 1, but FIG. 8 is a flowchart for explaining the operation of the slave station 2. As described above, the operation of the slave station 2 is divided into three cases: a case of a selecting sequence, a case of a polling sequence, and a case of a global polling sequence.

(1) In the case of the selecting sequence, the operation is to receive data from the master station 1 and it is determined whether or not the data can be received (step 81), and processing is performed adaptively.

(2) In the case of a polling sequence, the presence or absence of a transmission text is determined (step 82), and if there is, a transmission process is executed.

(3) In the case of the global polling sequence, when responding to the global polling, for example, when the own station address = 1 (step 83), or during the response waiting process, the global Upon receiving a response to the poll (step 85), the COS
It is determined whether there is (state change) (step 84), and an ACK or NAK corresponding to the presence or absence is transmitted. If NO in step 83, a wait time is calculated and a response is waited. When the wait time has elapsed (time-up), a signal corresponding to the presence or absence of COS is transmitted.

(Effects of the Invention) As described in detail above, by implementing the present invention, it is possible to transmit failure information to a master station in a very short time when an abnormality occurs in a slave station without changing a normal control speed. Since the detection of the abnormal state and the processing corresponding to the abnormal state can be performed promptly, the practical economical effect is extremely large.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of the present invention, FIG. 2 is a flowchart showing the outline of the operation of the present invention, FIG. 3 is a flowchart explaining the operation of the master station of the present invention, and FIG. 5 to 7 are flowcharts showing the sequence of each part in FIG. 4, and FIG. 8 is a flowchart explaining the operation of the slave station of the present invention. 1 ... master station, 2 ... slave station, 3 ... transmission line, 4 ... COS
Line 5, indoor unit controller 6, outdoor unit controller 7, indoor unit 8, outdoor unit 31-38 master station operation step numbers 41-46 partial sequence numbers 401
~ 403,51 ~ 55,61 ~ 69 ... Operation step number, 71,72 ...
Table, 81 to 84 ... Operation step numbers of slave stations.

Claims (1)

(57) [Claims] A master station for centrally monitoring and controlling distributed equipment to be controlled and a plurality of slave stations respectively connected to the equipment to be controlled are connected by a control line and monitored by a polling / selecting method. In a centralized supervisory control device for transmitting and receiving control data, a state change control line is provided on the control line for transmitting a state change signal indicating a state change of the controlled device between the master station and a plurality of slave stations. Means for outputting, to each of the plurality of slave stations, the state change signal to the state change control line when the monitored data of the controlled device exceeds a predetermined value, and transmitting the state change signal to the master station. Means for performing global polling for causing the master station to respond to the presence / absence of the state change to all of the plurality of slave stations when receiving the state change signal. Means for performing polling for responding to the slave station responding to the status change with information data indicating the content of the status change, and performing abnormality processing control corresponding to the status change. A centralized monitoring and control device, characterized in that: