DE19727953A1 - Method of activating process signals of technical plant, esp power station - Google Patents

Abstract

The method involves detecting measurement values and alarm signals characteristic of the process in different cycles (Z0-Z4), whereby the values and signals detected in at least one cycle are combined into a cycle block (B). The measurement values and/or warning signals combined into a block (B)are checked for plausibility and associated with the basic process signals (PS). The process signals for a selected time period are then placed in a common archive (28a-28b).

Description

The invention relates to a method for archiving of process signals of a technical system, in particular egg ner power plant. It continues to affect one after this Process working system.

In a power plant, a process control and information mation system, hereinafter called process system, the current Make the operating status of the system recognizable and deviations Reporting of a target condition and diagnoses of possible allow errors that occur. There is one extensive recording and storage of the operating readings of all system parts characterizing and Notification signals required. With increasing energy and / or Work utilization of such power plants and with increasing As their security standards increase, so do the Process system requirements with regard to processing processing, storage, analysis and logging of large data amounts.

Temporal processes are usually saved usually by chronological depositing of measured values and / or signal signals derived process signals. By represent different measured values and / or message signals Process signals are different types of process signals assigned. From the stored process signals, ins special for analysis or diagnostic purposes, images of the in the process running in the plant are created, the com complex states of the system at predeterminable times write.  

The high level of complexity and the high security requirements rations, especially a large-scale plant automation system usually includes a number of decentralized data processing systems units. In the decentralized data processing units the measured values and message signals are recorded and processed. Here On the one hand, the measured values are only archived if the Measured value recorded The last recorded and archived measured value has exceeded a tolerance band. On the other hand the message signals for each change in their respective status stands archived. The time of acquisition of each measurement tes and each message signal is recorded in the respective data cached work units. Then be the measured values and message signals with the associated time values as process signals via a data bus to the process system transferred and stored there in the correct order.

For storing temporal profiles of the process signals Circulation buffers or Ring buffer used. A ring buffer can be one contain large number of process signals and a time cover the area of several days. To get on a trial signal or an image over a selectable time range To be able to fall back on the current time position of the ring buffer usually sequentially be searched. This will take a long time, especially to find it previous process signals or images, a lot of time needed. As a result, one of the processes to be found signal dependent diagnosis in a disadvantageous way up to egg last a few hours. In addition - due to the large number of process signals to be archived with each because associated time features - a correspondingly large one Space needed.  

The invention is therefore based on the object of a method for archiving process signals of a technical system specify where the storage space requirement is particularly low is, and with which the for a specifiable time range to un searching process signals particularly quickly and easily are findable. Furthermore, a to carry out the procedure particularly suitable system can be specified.

The first-mentioned object is achieved according to the invention by the features of claim 1. The process flow characterizing measured values and / or signal signals in ver different cycles. After that, the in at least one egg Measured values and / or signal signals recorded in one cycle Cycle block summarized and deposited, the in which Cycle block stored measured values and / or message signals next checked for plausibility and then the green assigned process signal. The process signals of a selectable time range are then in a common archive.

The invention is based on the consideration that an Ar Chivation of the process signals with reduced storage space is possible if the process signals are not event-oriented, d. H. depending on exceeding or falling below a To tolerance band, archived. Rather, one in same intervals repetitive recording of the pro zeßsignale take place. In particular through cyclical reading of measuring channels or transmitters, the process signals as Raw values (measured values or signal signals) for a through the Zy only definable point in time. With such a time-determined acquisition of raw values of the process signals the storage of the time values of the process signals no longer required because those recorded for a certain cycle Raw values characterized by a common time characteristic can be.  

By storing the raw values together in one block the time of recording the raw values by the Ab duty cycle determined. The block-wise storage of in minde at least one cycle or interval recorded raw values of the pro zeßsignale claimed - compared to the full Hin Process signal assignment, d. H. the process signal with audible time feature - a significantly reduced memory place.

The second task is an archiving system tion of process signals of a technical system fiction accordingly solved with a buffer for cyclical acquisition Solution of measured values and / or message signals, which a diagnosis module for checking the plausibility and outputting the measurement values and / or the message signals are connected downstream. It includes further an interchangeable module for assigning the measured values and the Message signals for the underlying process signal. Further is an archive for the chrono which is connected after the exchangeable module Logical storage of the process signals provided.

In the buffer, the data is saved in at least one cycle, but preferably the raw values recorded in several cycles combined into a cycle block. If the biscuit filled with raw values, they apply to the diagnosis module as well as to the exchangeable module. By means of the slide gnosemoduls the raw values are checked for correctness and then, for example, on a screen or on a printer as message lists, as protocols or in form output a graphic.

The exchangeable module expediently has at least two Memory modules. The two memory modules are used for this as a so-called minute change buffer. For this purpose, all measured values te and signal signals, which are used as raw values of the process signals be detected within a minute in the first memory mo  dul deposited. The measurement recorded in the following minute Values and message signals are in the second memory module deposited. The raw values are process in the memory module sorted by signal. In other words: the raw values, d. H. the numerical, cyclically recorded measured values and / or Mel designale, the underlying process signals are added arranges. In doing so, they are associated with a single process signal raw values in a coherent and chronologically increasing manner in Storage module deposited.

For the process signal type "analog value" or "count value" the measured values of the process signal chronologically as raw values deposited. For the process signal type "binary value" there are as the raw values, the message signals are displayed in the correct chronological order sets. The measurement combined for a process signal values or message signals are then subsequently switched archive archived.

Depending on the choice of the predefinable sampling or cycle frequency for the individual process signals and the corresponding quantity of measured values and message signals to be archived can tere memory modules may be provided. Alternatively, the Memory modules regardless of a time range (Change of minutes) with cyclically recorded measured values and / or message signals are filled until the storage space of the memory module to be filled is exhausted. On the following measured values and / or messages then close signals written in the next free memory module.

The archive also includes an administration module and a da tenmodell file. In the administration module of the archive are at for example those time ranges in which the measured values and message signals stored in the archive are recorded have been. The data model file comprises in the manner of a static component a so-called data model of the Ar  chiv stored process signals. In the data model, e.g. B. Be deposit data and also such boundary conditions, among which the measured values and signal signals of the process signals were recorded or obtained. Here are as boundary conditions in particular process indicators, accompanying texts, measuring ranges, Acquisition cycle and / or processing instructions from Be interpretation.

For a diagnosis of the system status using the chronolo archived process signals or to display the Process signals is advantageously an output module see. The output module is e.g. B. a display means in the form a screen or a printer.

In addition, within a predeterminable time period Process signals stored in the archive, e.g. B. those pro zeßsignale during a startup of a system were partially recorded on an external memory, for. B. on CD-ROM, MOD or on a jukebox. Here can this outsourcing of the process signa to be considered le automatically, e.g. B. in a certain process state, or after selection by an operator. The process signals are expediently on the external Storage according to the storage structure in the archive behind sets.

The advantages achieved with the invention are in particular re in that by the cyclical recording of the measured values and / or message signals a block-wise storage of the measured values te and / or message signals is enabled. The are in measured values and signal signals stored in a block common time feature, d. H. through a time together point of detection, characterized. As a result, the Process signals derived from the measured values and signal signals le storage space-optimized. So for a late  tere analysis of the process signals to find the Process signals and consequently a quick evaluation of the system guaranteed state.

An embodiment of the invention is based on the drawing tion explained in more detail. In it the only figure shows schematic System components for chronological archiving of Process signals of a technical system, especially one Power plant.

A gas and steam turbine plant 1 is shown schematically in the figure as a power plant. This comprises a gas turbine 2 and a waste heat steam generator 4 connected downstream thereof on the exhaust gas side, the heating surfaces of which are connected to the water-steam circuit 6 of a steam turbine 8 .

Measured values detected by sensors (not shown) and message signals emitted by signaling elements (not shown) are fed as measuring data M1 to Mm to a central process system 20 . The process control and / or process information system 20 can be a personal computer or another data processing unit. By running within the process system 20 processes, the gas and steam turbine turbine 1 is automatically controlled and monitored.

The process system 20 comprises a buffer 22 , to the output side of which two interchangeable modules 24 a, 24 b and a diagnostic module 26 are connected. As indicated in the figure, the exchange modules 24 a, 24 b are followed by a number of archives 28 a to 28 z.

When the gas and steam turbine system 1 is operating, the measurement data M1 to Mm are recorded in acquisition cycles Z0 to Z4 as so-called raw values and fed to the process system 20 for further processing. In the detection cycle Z0, the measurement data M1 to Mn detected with a sampling frequency of preferably 100 Hz and the measurement data Mn + 1 to Mm detected with a sampling frequency of preferably 20 Hz are read. In the subsequent four detection cycles Z1 to Z4, the measurement data M1 to Mn are each read at a sampling frequency of 100 Hz.

In other words: the highest frequency measurement data M1 to Mn determine the smallest acquisition cycle Z0. The measurement data Mn + 1 to Mm with a comparatively small sampling frequency become higher in the corresponding detection cycle Z0 frequency measured data M1 to Mn. The with the sampling fre 20 Hz measured data Mn + 1 to Mm are combined detected in every fifth higher frequency cycle. The Erfas Solution cycles Z0 to Z4 each correspond to a time description range of 10 ms. The measurement data M1 to Mn and the measurement data Mn + 1 to Mm with a time resolution of 10 ms or of 50 ms.

Five detection cycles Z0 to Z4 each become a Zy Class B summarized. As a result, the cycle includes block B each have five different time values of the measurement data M1 to Mn and a time value of the measurement data Mn + 1 to Mm. The current value is the updated numerical value or raw value of the measurement data M1 to Mn for the respective acquisition cycle Z0 to Z4. The cycle block B corresponds to egg time range of 50 ms.

In the buffer 22 , for example, twenty cycle blocks B are stored with the respective detection cycles Z0 to Z4 in ascending order. The intermediate store 22 accordingly comprises all measurement data M1 to Mm which are acquired in a time range of one second ( 1 s). Finally, the measurement data M1 to Mm summarized in the buffer 22 as cycle blocks B are transmitted to the first exchange module 24 a or to the second exchange module 24 b for sorting and to the diagnostic module 26 for visualization.

The diagnostic module 26 enables a plausibility or error check of the measurement data M1 to Mm. On the other hand, the cyclically recorded measurement data M1 to Mm can be continuously output on an output module 29 , for example on a printer or on a screen, in the form of protocols or data lists.

The two change modules 24 a and 24 b work as so-called minute change buffers. Depending on an external minute pulse, the interchangeable module 24 a reads the measurement data M1 to Mm stored in the intermediate memory 22 from the latter. Analog to this, the exchange module 24 b reads out the measurement data M1 to Mm from the buffer 22 in the following minute. Depending on the structure and size of the exchangeable modules 24 a, 24 b, these can also cover larger time ranges.

In the interchangeable modules 24 a, 24 b, the measurement data M1 to Mm are assigned to the underlying process signal PS. The measuring data M1 to Mm are stored in a signal-oriented or process-signal-specific manner in the exchangeable modules 24 a, 24 b. The process signal PS includes six hundred updated measurement data M1 to Mn for a time range of one minute (1 min) at a sampling frequency of 100 Hz of the associated measurement data M1 to Mn. The process signal PS, whose associated measurement data Mn + 1 to Mm are detected with a sampling frequency of 20 Hz, thus comprises one hundred and fifty different updated measurement data Mn + 1 to Mm for a time range of one minute (1 min). The measurement data M1 to Mm of the underlying process signal PS are stored in the interchangeable module 24 a or 24 b in a coherent and chronologically correct manner.

For the chronological archiving of the process signals PS, these are transmitted to the archive 28 a with the associated measurement data M1 to Mm. In the archive 28 a, the measurement data be deposited M1 to Mm for each process signal PS as a Meßwertfile F1 to Fz out. The Meßwertfiles F1 may be stored in the archive table egg ner 28 a to Fz in shape. For example, the process signals PS and the associated measurement data M1 to Mm form the rows or columns of the table.

They are cyclical in the respective measured value file F1 to Fz took measurement data M1 to Mm as raw values - starting with one Start time - stored chronologically. The size of the measurement Wertfiles F1 to Fz is from the acquisition cycle of the measurement data M1 to Mm depending on the process signal PS. For process signals PS, whose measurement data M1 to Mn with the same sampling frequency measured from 100 Hz, the measured value file F1 to Fz consequently the same size. In particular, those in ei Measurement data M1 to Mn on the common cycle Z0 same position, d. H. in the same column, in each Measured value file F1 to Fz stored.

Is the process signals PS of He-making period or time domain for all the archives 28 a through terlegten process signals PS same - due to the cyclical acquisition or scan - and thus Burst scan.

The respective status of the time range of the process signals PS is stored in an administration module 30 . If all of the measured data M1 to Mm of the underlying process signal PS have been recorded, the associated time range has the status "Status = ok". In the event of a malfunction, e.g. B. with a malfunction of a transmitter or with a measured value overflow, the status "status = error" is assigned to the time range.

Furthermore terlegt are the start time and the end time of the detection period, the process signals PS towards the management module 30th So that the archive 28 a is protected against a so-called overflow, that is, before overwriting of already archived process signals PS by new process signals PS, the fill level of the archive 28 a is stored in the administration module 30 by means of a counter function.

If archive 28 a is filled, the system automatically switches to the next archive 28 b. All subsequent process signals PS are then archived in this archive 28 b. If all the archives 28 a to 28 z are filled with process signals PS, the oldest archive 28 a to 28 z is released and filled with newly added process signals PS. The archives 28 a to 28 z are thus designed as so-called ring memories. The number of archives 28 a to 28 z can vary depending on the selected sampling or detection frequencies of the process signals PS and the available storage space.

In addition, the archive 28 a includes a data model file 32 . So-called description data and / or such boundary conditions under which the process signals PS are acquired or obtained are stored in the data model file 32 in the manner of a static component of the process signals PS. Descriptive data include, for example, the name of the process signal PS, its measuring range, its detection cycle and / or its type of processing.

The process signals PS stored in the archives 28 a to 28 z can, depending on the requirement, either on an optical memory, for. B. on a CD-ROM or on a MOD, archived or on the output module 29 , z. B. on a printer. It is possible for only the process signals PS stored over a selectable time range, for example during a startup process of a component, to be archived or output. In particular, the chronological deposit of the process signals PS allows a particularly fast finding and reading out of the process signals PS to be examined.

Claims (5)

1. Method for archiving process signals (PS) of a technical system, in which the process sequence characterizing measured values and / or signal signals are recorded in different cycles (Z0 to Z4), the measured values being recorded in at least one cycle (Z0 to Z4) and message signals are combined and stored in a cycle block (B), the measured values and / or message signals stored in the cycle block (B) being checked for plausibility and being assigned to the underlying process signal (PS), the process signals (PS) being selectable Time range in a common archive ( 28 a to 28 z). 2. System for archiving process signals (PS) of a technical system with a buffer ( 22 ) for the cyclical acquisition of measured values and / or signal signals, a diagnostic module ( 26 ) for checking the plausibility and output of the measured values and the signal signals, and an exchangeable module for assigning the measured values and the signal signals to the underlying process signals (PS), and with an archive ( 28 a to 28 z) downstream of the interchangeable module for chronological storage of the process signals (PS). 3. System according to claim 2, wherein the interchangeable module has at least two memory modules ( 24 a, 24 b). 4. System according to claim 2, wherein the archive ( 28 a to 28 z) comprises a management module ( 30 ) and a data model file ( 32 ). 5. System according to any one of claims 2 to 4, in which an output module ( 29 ) is provided for displaying the process signals (PS).