JPS63156445A - System for detecting state noncoincidence in monitoring and control system - Google Patents

Abstract

PURPOSE:To perform monitoring by the display screen of a primary station with high reliability, by detecting noncoincidence between the storage state of the primary station and the sensor state of a secondary station automatically, and performing a processing posible to discriminate the face of the outside by using a check sum checking circuit. CONSTITUTION:The titled system is constituted in such way that the primary station 1 supplies received state value and check sum to a sensor state input circuit 17 via a line control part 16, and at this time, when an input data is a sensor state value, it is stored on a prescribed one memory 6 corresponding to the secondary station 2 transmitting a received sensor state value, out of the memories 6 of the same number as the secondary stations 2 in total, meanwhile, when the input data is the check sum, it is supplied to the check sum checking circuit 7. When the storage state value of a sensor memory 13 of the N-th number of the secondary station 2 is different from that of the memory 6 of the primary station 1 (in order word, when noncoincidence is generated), a message representing state noncoincidence is outputted to a printer 19 by a post-processing circuit 18 to which a check sum checking result is supplied from the check sum checking circuit 7 in the primary station 1.

Description

[Detailed Description of the Invention] [Summary] A monitoring system for building management systems, etc. that monitors the status of on-site sensors connected to a secondary station on the display screen of the primary station.
In a control system, the secondary station outputs a checksum regarding the state of the field sensor and sends it to the primary station, and the primary station uses the checksum to
It is possible to automatically detect a discrepancy with the state value on the next cycle's memory.

[Industrial application field]

The present invention relates to a state discrepancy detection method in a monitoring/control system, and particularly in a system where the state of a field sensor is collected at a secondary station and displayed on a display screen of a primary station, the present invention relates to a method for detecting a state discrepancy between the sensor state and the display screen display. If the discrepancy is detected automatically, the discrepancy detection function will be set to 1.

In monitoring and control systems such as building management systems, it is essential that the status of the field sensor collected at the secondary station is always correctly displayed on the display screen of the primary station.
It is considered the most important for monitoring and controlling.

Conventional technology] In conventional monitoring and control systems, the status of on-site sensors connected to each of a plurality of secondary stations (in building management systems, for example, the on/off status of air conditioners, the on/off status of lights, The status of the door (opening/closing status, etc.) is sent to the primary station, and displayed on the primary station's display screen, for example, by using various graphics marks to indicate the type of sensor, and by color to indicate the status. was monitored by humans.

In this conventional monitoring and control system, a discrepancy between the state of the field sensor and the display on the monitor screen of the primary station means that a person looking at the monitor screen accidentally notices that the state of the field sensor is strange. Furthermore, the above-mentioned discrepancy only occurs in cases where the discrepancy is confirmed for the first time by going to the site, and automatic detection of this discrepancy has not been done in the past.

[Problem to be solved by the invention] Is it possible to monitor the status of field sensors connected to the secondary station on the display screen installed at the primary station? 52, in the control system, the status 1r1 (on/off status or alarm status) was sent from the secondary station to the primary station only when the sensor status changed.

However, due to various causes such as failure of the interface circuit between the hardware and software of the secondary station, failure of the hardware or software itself, or failure of transmission, the status of the field sensor and the display screen of the primary station may be A discrepancy with the status display may occur, and conventionally this discrepancy could not be detected, so the normal c? J2
There were problems such as sometimes not being able to do so.

The present invention was created in view of the above points, and an object of the present invention is to provide a state mismatch detection method that can be used in a monitoring/control system that can detect state mismatches.

[Means for solving problems]

FIG. 1 shows a principle block diagram of a state discrepancy detection method in a monitoring and control system of the present invention. In the same figure, 1
is a primary station, 2 is a secondary station, and a field sensor 3 is connected to the secondary station 2. The status of the field sensor 3 is sent from the secondary station 2 to the primary station 1 and monitored on the screen of the display 4.

In such a monitoring/control system, the secondary station 2 is provided with a checksum calculation stage 5, and the primary station 1 is provided with a memory 6, a checksum detection circuit 7, and a post-processing means 8. It is being

The meter 6 stores the state value of the field sensor 3, and the checksum verification circuit 7 performs checksum verification from the state value from the memory 6 and the received checksum. A plurality of secondary stations 2 are usually provided.

[Effect]

The checksum calculated by the checksum extracting means 5 from a predetermined formula based on the state value of the on-site sensor 3 is
The signal is supplied to the checksum verification circuit 7 in the primary station 1. The state of the field sensor 3 is also stored in the memory 6 and updated when there is a change.

If the result of the verification by the checksum detection circuit 7 is that the states do not match, the first stage of post-processing 8 performs processing that allows external identification of this fact.

[Example of fruit eggplant]

FIG. 2 does not show a block diagram of one embodiment of the present invention.

In the figure, the same components as in FIG. 1 are given the same reference numerals. In FIG. 2, various status values detected by the on-site sensor 3 are input to the sensor input unit 10 in the primary station 1. Line 1 via sensor state detection/transmission unit 119 and line control unit 12, respectively.
5. Further, the above state value is supplied from the sensor state detection/transmission section 11 to the sensor memory 13 and stored therein.

The status value read from the sensor memory 13 is supplied to a checksum n output circuit 14, which outputs a checksum. The sensor output circuit 913 and the checksum output circuit 14 constitute the above-mentioned checksum output means 5. For example, the following two checksum output circuits CON and CA L
Each of them meddles with M as if it were a law.

The first checksum CON is a checksum of the on/off state values and is determined based on the formula n=1. Further, the second checksum CALM is a checksum of the alarm/normal state values and is determined based on the formula n=1. Here, in the above equations (1) and (2), PATI indicates the nth point address among the point addresses assigned in advance for each sensor at the secondary station 2, and TON is 717 only when the on/off status value indicates the on status among the on/off status values or alarm/normal status values, and YQ for all other status values. ?A variable that indicates the direction of TA L
M is v17 only when the alarm/normal status value indicates the n-report status behind each status value at that point address.
All other state values are variables that indicate the value vOv.

These checksums CON and CALM are output at regular intervals (for example, one minute) and are sent to the line 15 via the line control section 12 in the format shown in FIG. 4, for example.

There are usually multiple secondary stations 2 with the same configuration as in Figure 2.
The data transmission procedure between the primary station 1 and these plurality of secondary stations 2 is, for example, a high-level data link control procedure (1-
IDLC), and the screen of the CRr 20 as an example of the display 4 of the primary station 1 shows the state of the memory 6 Q.
l value is displayed.

As shown in the flowchart of FIG. 3(A), the primary station 1 polls the N-1st secondary station 2, and then polls the N-th secondary station 2.
Polling of the second secondary station is performed (step S+,
82). On the other hand, the Nth secondary station operates according to the procedure of the flowchart shown in FIG. checksum CALM
Calculate step 512), and when primary station 1 polls, these checksums CON and CA L M
is transmitted to the primary station 1 (step 513).

Here, as shown in FIG. 2, the primary station 1 supplies the received status value and checksum to the sensor status input circuit 17 via the line control unit 16, and here, the input data is the sensor status value. , the total number of memories 6 is the same as that of the secondary station 2.
Of these, the received sensor status value is stored in a predetermined negative memory 6 corresponding to the sending secondary station, and on the other hand, when the human data is the checksum CON and CA L H, it is stored in the checksum horizontal frame circuit 7. It is configured to supply

After the primary station 1 detects the checksum CoN and CALM in step S3 shown in FIG. ] The checksum CON and CAL M transmitted from the secondary station 2 of the When the storage status value of the memory 13 differs from the storage status value of the primary station 1 message L6 (
In other words, when a discrepancy occurs), the post-processing circuit 18 to which the checksum verification circuit 7 in the primary station 1 supplies the checkrim verification result outputs a message to the printer 19 indicating that the status does not match. Relinking with the secondary station 2 is performed via the line control unit 16 for status adjustment (third
Step Ss in Figure (A). In order to relink with the secondary station 2, all point information (status values) of the secondary station 2 is forcibly taken up.

The monitoring stone can identify a discrepancy in status by checking the abnormality message sent by the printer 19, but this identification means is not limited to this, and it goes without saying that other means such as a buzzer or voice can also be used. Guaru.

When the post-processing in step S5 described above is completed, or when it is determined in step S4 that the states match as a result of the checksum horizontal frame by the checksum verification circuit 7, the primary station 1 is operated as shown in FIG. 3(A). Thus, polling is performed for the next N+1st secondary station. Thereafter, in the same manner as above, the primary station 1 polls the multiple secondary stations 82 in order, performs a checksum check each time, and detects whether the status matches or does not match. Repeat post-processing.

On the other hand, as shown in FIG. 3(B), secondary station 2 performs check 9m transfer 1 sense lease 4-vn (step 514), and then receives a relink request from primary station 1. If so, the status of all points is returned to the primary station (step 515).
.

〔Effect of the invention〕

As described above, according to the present invention, a discrepancy between the storage state of the primary station and the sensor state of the secondary station is automatically detected, and a punishment is taken to make this fact visible to the outside. Monitoring on the display screen of the next station can be performed with high reliability, and since the link between the primary and secondary stations is re-combined as post-processing, monitoring is more reliable than before.・It has features such as being able to construct a control system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a detailed flowchart for explaining the present invention, and FIG. 4 is a block diagram of the blocks transmitted and received in the present invention. FIG. 2 is a configuration diagram of an embodiment of Tuxum. In the figure, 1 is a primary station, 2 is a secondary station, 3 is a field sensor, 4 is a display, and 5 is a check rim exit means. 6 is a memory, 7 is a checksum verification circuit, 8 is a post-processing means, 13 is a sensor memory, 14 is a checksum n output circuit, and 17 is a sensor status input circuit. Agent Patent attorney 11 digits - 7, -149 size Jikiri Pro 1 ri 4 Younger brother 1 Nu 1 Juto Hiwa no 1f) Bushi 1 2] E 2 Figure

Claims (1)

[Claims] The state of the field sensor (3) connected to the secondary station (2) is
In a monitoring and control system that monitors on the screen of the display (4) of the next station (1), a check that calculates a checksum regarding the status value of the on-site sensor (3) and sends it to the first station (1). A sum calculation means (5) is provided in the secondary station (2), and a memory (6) for storing the received state value of the on-site sensor (3), and the received checksum and the memory (6).
A checksum verification circuit (7) that performs a checksum verification based on the state value of the above, and a post-processing means (8) that externally identifies when the state does not match as a result of the checksum verification. A state discrepancy detection method in a monitoring/control system characterized by being provided at a station (1).