JPH0795873B2 - Plant monitoring equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a monitoring device for a plant, and more particularly to a monitoring device that has improved accuracy.

[Conventional technology]

Conventionally, when capturing and monitoring data passing on a transmission line, it is general to determine the state of the data on the prospective device side, add the time on the capturing device side, and output it as monitoring information. One of the conventional examples is JP-A-60-247346. In this conventional example, synchronous time data is made to flow on the data transmission path so that the time of each processing device can be adjusted.

[Problems to be solved by the invention]

In the above-mentioned Japanese Patent Laid-Open No. 60-247346, synchronous data (synchronous signal) is transmitted to a certain processing device on a data transmission path, the time of each processing device is adjusted to this synchronous signal, and the time of each processing device is adjusted. . In this way, the monitoring time of the same data in each processing device can be matched.

However, due to the load condition of the data transmission path and the required processing time for noise countermeasures in each processing device,
The time when the synchronization time signal reaches each processing device via the data transmission path is often different. Therefore, by the time each processing unit is reached, the time difference has already occurred.

On the other hand, it is equipped with three processing devices, and these three processing devices are used as timekeepers, and the average of the two closest times sensed by these timekeepers is used as the system time to match the monitoring time. There is also an example in which it is tried (USP, 508795).

In this method, the host processor sends the time to each plant input processing device through the data transmission path, so that the delay of data transmission due to the load of the data transmission path and the noise countermeasure in each plant input processing device Due to a check or the like, it is difficult for the times of the timers of the respective processing devices to coincide with each other.
Even if the time of the timer of each processing device is exactly the same, the distance between the host processing device and each input processing device is not the same through data transmission, so even if each input processing device simultaneously captures data. , There is a possibility that the host processor takes in the data from each input processor at different times due to the time shift on the transmission path, and it is difficult to realize the same time property of the data and the clear temporal order relation of the data. Funny

An object of the present invention is to solve the above problems and to provide a plant monitoring apparatus that realizes highly accurate data simultaneity and temporal order relation of data.

[Means for solving problems]

According to the present invention, the plant input unit attaches the time to the plant input data and sends the plant input data to the upper processing unit, and the upper processing unit receives and monitors the data with the time.

Further, according to the present invention, a time synchronizing pulse is sent from one processor (referred to as a master processor) among a plurality of higher order processors to the plant input section, and each plant input section receives the time synchronizing pulse and outputs it. The time at the time of reception is obtained, and each input unit sends this reception time to the master processing device, and the master processing device compares the reception time corresponding to each input unit with the time synchronization pulse to calculate the time difference. The data was sent to another higher-level processing device, and the time shift correction was performed at each input unit to eliminate this shift.

The input unit is a concept including an input terminal and an input processing device, and this input processing device is used exclusively for input processing, unlike a higher-level processing device.

[Action]

In the present invention, the plant input processing device is plant data,
Alternatively, the acquisition time is added to the plant data group, and the plant data and the time are paired and transmitted to the data transmission path. Each upper-level processing device receives the plant data with the acquisition time added at a fixed cycle, and outputs the time added to the data together with the obtained data to the output unit (CRT, printer, etc.), thereby outputting the same data multiple times. Even if it is output by one processing unit, the difference in the capture time will disappear.

Further, according to the present invention, a time synchronization pulse is periodically output to different plant input processing devices from any preselected master processing device on the side using the plant data. Next, the master processing device compares the reception time of each plant input processing device with the time synchronization pulse of the master processing device, and calculates the deviation of each plant input processing device. This time difference is transmitted from the master processing device to another higher-level processing device via the data transmission path. Each plant input processing device adds the fetched time to the fetched plant data, and sends the plant data and the time as a pair to the data transmission path. Each host processor receives the plant data with the time added,
By correcting the time added to each data by the time shift, it becomes possible to synchronize the time between the plant input processing devices and to have a clear temporal order relationship of the plant inputs.

〔Example〕

First Embodiment of Distributed Plant Monitoring / Control Device of the Present Invention
Shown in the figure. Three upper processing devices 1 were installed and connected to buses 4A and 4B in parallel with each other. Three CRTs 5, two keyboards 6, and two printers 7 were connected to the bus 4A. Two plant input processing devices 2 and two plant equipment control devices 8 were connected to the bus 4B. The process input / output card 3 is connected to the input processing device 2. The upper processing device 1 and the input processing device 2 each comprise a computer.

The three host processors 1 are used exclusively for alarms, printing, control, etc. It may have a role for CRT display. The upper processing device 1, the plant input processing device 2, and the plant device control device 8 exchange data with each other via the data transmission path 4B.

The plant equipment control unit 8 opens and closes the facilities on the side of the plant in response to a command from the processing unit 1, and feeds the opening and closing result back to the host processing unit 1.

Raw input from the plant that is not transmitted from the plant equipment control device 8 is taken into the processing device 2 via the process input / output card 3 and sent to the upper processing device 1 via the bus 4B. The types of data taken in through the input / output card 3 are divided into important input points related to plant trips and other normal input points to be input for plant monitoring. At these input points, the other party is usually a turbine, a boiler, a generator, etc. Therefore, the plant input processing devices 2 are installed in a distributed manner according to these devices.

These distributed input processing devices 2 usually have different device models because of differences in the amount of data to be taken in from the plant and the delivery range is not limited to one company.
In this case, the hardware and software configurations are naturally different. The processing speeds are also different (there are differences in both hardware and software).

Therefore, an event such as a plant trip may occur, and the order of occurrence of the phenomenon may be a problem. In such a case, when a plurality of input processing devices 2 take in the occurrence events one after another, if there is a time difference between the input processing devices, the occurrence order of the abnormality cannot be grasped and the cause of the abnormality cannot be grasped. It will be.

As a countermeasure, when the input processing device 2 captures the data, the input processing device 2 adds the capture time to the data and sends the data to the upper processing device 1. Further, the master processing device 1 arbitrarily selected to synchronize the times among the plurality of input processing devices.
To transmit the time synchronization pulse 9 signal to each plant input processing device 2. At this time, the master processor 1 fetches the time from the process input processor 2 via the data transmission line 4B and compares it with the time synchronization pulse signal to calculate the time difference between the process input processors 2. This time correction amount is transmitted to another upper processing apparatus 1 via the data transmission path 4B. The paired plant data and time transmitted from the plant input processing device to the higher-level processing device 1 via the data transmission path 4B are corrected in the higher-level processing device 1 by the time shift to synchronize the time. . The host processor 1 rearranges the time-corrected plant input data in order of time, displays the data on the CRT 5, and prints it out on the printer 7.

FIG. 2 is an explanatory diagram centering on the processing contents of the higher-level processing device 1 and the input processing device 2. The internal blocks of the processing devices 1 and 2 are processing flow diagrams.

First, the plant data is taken into the processing device 2 via the input / output card 3. It is then scaled in engineering step 12. The scale-converted data is incorporated in the transmission data structure shown in FIG. 3 in the transmission data editing processing step 13. At this time, the acquisition time of the plant data obtained in the acquisition time processing step 11 is also incorporated in the transmission data structure shown in FIG. The transmission data incorporating the plant data and the acquisition time is sent to the data transmission line 4B in the data transmission processing step 14. The transmission data sent to the data transmission path 4B is fetched by the host processor 1 by the data reception processing step 15, and the input point number, engineering value, message, data status and fetched time are output by the data editing processing step 16. The output format is edited according to the device and is stored in the storage device 18. Then, the operation request processing step
21. The data is taken out from the storage device and output to the CRT 5 and printer 7 by the diary editing processing step 22.

In the structure of the plant data shown in Fig. 3, one block is composed of the input point 27, the engineering value 28, and the input state 29, and one block is composed of a plurality of blocks 24, 25, 26 and the time block 23. To do. The value of each block is taken into the plant input processing device 2 at the same time, and if the data of the capacity of one packet or more is taken in at the same time,
Emit a plurality of packets onto the data transmission path. At this time, the times added to the plurality of packets are all the same time.

FIG. 4 shows an overall flow chart of the alarm printing process on the CRT 5 and the printer 7.

Step S1: The plant data is taken into the host processor via the plant input processor and the transmission data path.

Step S2: From the input point number of the plant data, the alarm value at that input point is set and compared with the T-value of the plant data.

Step S3: If the engineering value exceeds the alarm value as a result of comparison in Step S2, the processing of the next Steps S4 and S5 is performed.

Step S4: Read the message from the input point number and engineering value, and the status of the measured point from the print edit information table. The data acquisition time is extracted from the plant data and edited according to the printout specifications.

Step S5: The input point number, engineering value, message, measured point status, and data acquisition time edited in Step S4 are printed.

FIG. 5 shows a processing block diagram of the trip monitoring device for correcting the time shift. The master processing device 10 arbitrarily selected from the plurality of upper processing devices 1 transmits the time synchronization pulse signal 9 to the process input / output card 3 periodically while avoiding a time when the processing device has a heavy load. The time when this synchronizing signal is received is collected by the transmission data edit processing step 13 and is sent to the data transmission line 4B through the format of FIG. 8 through the data transmission processing step 14. The master processor 10 receives the time taken by each input processor from the data transmission path 4B and compares it with the time at which the sync pulse signal is transmitted.

The time when the synchronous pulse signal is transmitted is H (hour) M (minute) S (second) T ₀ (millisecond) The time taken by each plant input processing device (n units) is H (hour) M (minute) S ( Second) T ₁ (millisecond) H (hour) M (minute) S (second) T ₂ (millisecond) H (hour) M (minute) S (second) T _n (millisecond) The difference between the time taken by the input processing device and the time when the synchronous pulse signal is transmitted is calculated as follows.

ΔT ₁ = H (hour) M (minute) S (second) T ₁ (millisecond) −H (hour) M (minute) S (second) T ₀ (millisecond) = T ₁ −T ₀ (millisecond) ΔT ₂ = H (hour) M (minute) S (second) T ₂ (millisecond) −H (hour) M (minute) S (second) T ₀ (millisecond) = T ₂ −T ₀ (millisecond) ΔT _n = H (hour) M (minute) S (second) T _n (millisecond) −H (hour) M (minute) S (second) T ₀ (millisecond) = T _n −T ₀ (millisecond) Time difference from the time when these sync pulse signals are generated ΔT ₁ , ΔT
_2, ... via the data transmission line 4B the [Delta] T _n transmits the other processing apparatus 1. These time shifts ΔT ₁ , ΔT ₂ , ... ΔT _n are used to synchronize the time of each input processing device.

Boiler 30 when trip occurs in turbine plant 31
On the side, a contact change also occurs and is taken into each plant input processing device 2 via the process input / output card 3. The taken-in plant input contact state 36 is added with the taken-in time 23, and the transmission data editing process (step 13) is carried out in the format shown in FIG. Acquisition time 23 and input point
27, the contact state 36, and the input state 29 are sent to the data transmission line 4B through the data transmission process (step 14).
These trip contact states are taken in by each upper processing unit 1 and the time difference ΔT ₁ ~
Correct ΔT _n . That is, each plant input processing device 2
The capture time of the trip contact input in each is A (hour) B (minute) C (second) D ₁ (millisecond) A (hour) B (minute) C (second) D ₂ (millisecond): A (hour ) B (minutes) C (seconds) D _n (milliseconds), the time after the time offset correction is A (hours) B (minutes) C (seconds) D ₁ = ΔT ₁ (milliseconds) A (hours) ) B (minutes) C (seconds) D ₂ = ΔT ₂ (milliseconds): A (hours) B (minutes) C (seconds) D _n = ΔT _n (milliseconds) Occurrence according to these corrected times Determine order and CR
An alarm is displayed on T5 and an alarm is printed on the printer 7. By the above processing, the time synchronization between the different plant input processing apparatuses 2 can be carried out with high accuracy, and the factor of the trip can be clarified. FIG. 7 shows the general flow of the above processing in steps S1 to S6.

〔The invention's effect〕

According to the present invention, in the distributed control system, when the same data is output to a plurality of output devices, there is no difference in the time of simultaneous output, and the output data of each output device is clearly the same data from the time. It will be possible to confirm that.

When an event occurs, the data and the order of occurrence of the data can be known with high accuracy, which further contributes to the investigation of the cause of the event.

[Brief description of drawings]

FIG. 1 is an embodiment diagram of a distributed plant monitoring / control apparatus of the present invention, FIG. 2 is an embodiment diagram centering on the processing of the monitoring / control apparatus of the present invention, and FIG. 3 is a data format example diagram, Fourth
FIG. 5 is a process flow chart of this embodiment, FIG. 5 is an embodiment diagram centering on time correction processing, FIG. 6 is a data format example diagram, FIG. 7 is a time correction flow chart, and FIG. It is another data format example figure. 1 ... High-order processing device, 2 ... Input processing device.

Claims (4)

[Claims] 1. A plurality of high-level processing devices provided exclusively for each processing, and a plurality of plant data input units provided for taking in plant data from each plant device,
A means for adding the acquisition time to the acquisition plant data in each plant data input unit, and transmitting the data with this time to each of the plurality of higher-order processing devices in order to monitor the data and time in the higher-order processing device; , A plant monitoring device. 2. The plant monitoring device according to claim 1, wherein the plant data to which the time is added is sent to the upper processing device at a constant cycle. 3. A plurality of higher-level processing devices provided exclusively for each process, and a plurality of plant data input units provided for fetching plant data from each plant device,
A means for adding the acquisition time to the acquisition plant data in each of the plant data input sections, and transmitting the data with the time to each of the plurality of upper processing devices so as to monitor the data and the time in the higher processing device; In addition to the above, one of the plurality of higher-level processing devices is
A means for sending a time synchronization pulse to each of the plant data input units, and a time difference is obtained by comparing the time synchronization pulse with the reception time sent from each of the plant data input units to obtain a time lag. The processing device is provided with a comparison / correction means for correcting the time lag, and the plurality of plant data input parts are provided with means for obtaining the reception time of the time synchronization pulse sent out and the reception time as the time. A plant monitoring device comprising: a host processor that has sent the synchronization pulse, and a means for sending the pulse to be used as a reception time at the comparison and correction means. 4. The plant monitoring device according to claim 3, wherein the time synchronization pulse from the processing device is sent to the plant data input section at a constant cycle.