CN115134185A - Time division multiplex communication method for turbine monitoring instrument - Google Patents

Time division multiplex communication method for turbine monitoring instrument Download PDF

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Publication number
CN115134185A
CN115134185A CN202210742812.8A CN202210742812A CN115134185A CN 115134185 A CN115134185 A CN 115134185A CN 202210742812 A CN202210742812 A CN 202210742812A CN 115134185 A CN115134185 A CN 115134185A
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bus
communication
node
time
data
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虞为慈
朱武亭
章皓轩
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Shanghai Yingdian Control Technology Co ltd
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Shanghai Yingdian Control Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40026—Details regarding a bus guardian
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/50—Circuit switching systems, i.e. systems in which the path is physically permanent during the communication
    • H04L12/52—Circuit switching systems, i.e. systems in which the path is physically permanent during the communication using time division techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40215—Controller Area Network CAN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40267—Bus for use in transportation systems
    • H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle

Abstract

The invention relates to a method for time division multiplex communication of a turbine monitoring instrument, which divides a time domain into a plurality of small sections of periodic cycle, wherein the time length of each section is fixed; each communication node occupies the serial bus of the bus board in turn according to a convention sequence, each node transmits data to the bus in a specific time period, and the rest nodes which are not in the transmission time period receive the bus data; when a new communication node is added into the bus, the monitoring mode is firstly entered, and then the normal transceiving mode is entered after the sending time period of the node per se is analyzed and judged according to the existing communication condition on the bus; when the existing communication node quits communication, the bus of the original occupied time interval is kept idle, and the main control node is not needed in the whole communication process; compared with the prior art, the invention can realize the communication of each communication node on the serial bus, each node can not generate the communication conflict on the bus, and the efficiency of data communication between the nodes is greatly improved because of adopting a one-transmitting multi-receiving mechanism.

Description

Time division multiplex communication method for steam turbine monitoring instrument
[ technical field ]
The invention belongs to the technical field of a turbine monitoring and protecting instrument, and particularly relates to a time division multiplex communication method for a turbine monitoring instrument.
[ background art ]
Turbine monitoring and protection Instruments (TSI Instruments for short) are one of the key devices for ensuring the operation safety of a Turbine. The conventional structure of the TSI meter is to insert various modules with different functions, such as a signal monitor module, a power supply module, a configuration communication module, etc., into a meter frame. The power module supplies power to each module through the frame bus board, and the parameter monitor module receives a measurement signal from the field sensor, displays a monitored parameter value after being processed by the monitor module, and generates various alarm or record signals to be output. The monitor frames, the frame bus board, the power module, the monitor module, the configuration communication module, the field sensor and the like form a complete set of TSI instrument.
The monitor modules in early TSI meters were independently operated, each receiving a sensor signal from the field, and generating various alarm signal outputs via relays (or transistors). The logical combination of multiple monitoring modules involved requires the user to build either hard-wired or PLC with relays external to the TSI meter.
With the development of the meter technology and the communication technology, the TSI meter starts to use the bus board bus of the monitor frame to enable each monitor module (even the intelligent power module) to communicate with each other, and perform operation according to the data and the state of the TSI meter itself and other modules to generate a complex alarm signal output, thereby realizing various logic combinations of modules and the like. Limited by the mechanical structure of the TSI meter, each monitor module in the meter frame must meet the requirement of hot plugging, and the bus board bus is usually designed in a serial bus mode. Because a TSI frame is typically used for monitoring and protecting various parameters of a rotating machine, the monitor modules within the frame must be independent of each other, and failure of any one monitor module cannot propagate or affect other monitor modules. This requires communication between the monitor modules in the TSI framework, which is not possible using the master-slave communication mode commonly used in serial buses, because once the master communication module fails, the communication of the whole framework may be disabled. Since the TSI meter monitors the high-speed rotating machine on-line, it is necessary to be able to respond and process quickly in case of a module failure, and therefore, the communication between modules must be real-time, efficient and stable, and it must be able to transmit information from one monitor module to the other within a certain time. This requires that the communication between the monitor modules cannot use a preemptive, random communication mode because this mode does not ensure that the information from the source node arrives at the destination node within a certain time.
[ summary of the invention ]
The invention aims to solve the defects and provide a time division multiplex communication method for a steam turbine monitoring instrument, which can realize the communication of each communication node on a serial bus, and avoid the situations that the communication in the whole monitor frame is paralyzed due to the fault of a certain communication node in the communication process and the transmission of certain nodes is delayed due to the occupation of the communication bus by a plurality of nodes.
In order to realize the purpose, the time division multiplex communication method for the steam turbine monitoring instrument is designed, a time domain is divided into a plurality of small sections of periodic cycle, and the time length of each section is fixed; each communication node occupies the serial bus of the bus board in turn according to a convention sequence, each node transmits data to the bus in a specific time period, and the rest nodes which are not in the transmission time period receive the bus data; when a new communication node joins the bus, the sending time interval of the node is analyzed and judged according to the existing communication condition on the bus.
Preferably, the time domain is periodic and cyclic, the cycle period is determined according to the response time of the TSI meter, the time in each cycle is divided into segments with equal length, and the number of the divided segments is determined according to the maximum number of nodes which can participate in communication in the TSI framework.
Preferably, each module in the TSI frame occupies the serial bus of the frame bus board in turn according to the sequence of its node number, and transmits the node data in the time period/phase allocated to each time cycle.
Furthermore, the nodes which are not in the sending state can receive the data sent by other nodes on the bus, and the efficiency of information exchange between the nodes is greatly improved by adopting a one-to-many receiving communication mechanism.
Further, the bus uses a CAN bus and conforms to CAN 2.0B protocol text.
Preferably, each communication node has two working modes of interception and normal receiving and transmitting; and in the normal transceiving mode, the data is sent to the bus in a determined period according to the rule, and the data of the bus is received in the rest period.
Preferably, when a new communication node joins the bus, the new communication node firstly enters a monitoring mode, then calculates a proper sending time period of the own node according to a sending rule of the existing node on the bus, and enters a normal transceiving mode after a time value is stable and no other fault exists.
Preferably, the communication node that has sent the sequence is idle on the bus for the allocated period of time when it exits the communication.
Furthermore, the communication node in the normal working mode can finely adjust the self sending time interval according to the communication time sequence of the bus.
Further, if a plurality of monitor modules simultaneously transmit data due to an accident, arbitration is performed according to the priority level of information, information of high level can be successfully transmitted, and other information is marked as failure.
Compared with the prior art, the invention has the following advantages:
(1) the invention can realize the communication of each module in the frame on the serial bus by using the TSI monitor frame bus;
(2) the invention has no master control (or leading) monitor module in the communication process, and can not lead to the paralysis of the communication of the monitor module in the whole monitor frame because a certain monitor module has a fault;
(3) the information generated by each monitor module can be ensured to be transmitted from the source node to the target node within milliseconds, and the condition that a plurality of nodes seize a communication bus to cause the transmission delay of some nodes can be avoided;
(4) the invention allows any communication node to join and leave in the communication process, and the change does not influence the communication of other modules.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a time division multiplex communication method according to the present invention;
FIG. 2 is a timing diagram of a bus packet according to the present invention;
FIG. 3 is a block diagram of a communication implementation of the present invention;
FIG. 4 is a flow chart of the communication reception of the present invention;
fig. 5 is a flow chart of communication monitoring according to the present invention.
[ detailed description of the invention ]
The invention is based on time division multiplex communication technology, realizes that each module in the TSI monitor frame adopts mutual coordination (without a main station) on a serial bus to complete real-time, efficient and stable communication. In this context, for the sake of convention, "monitor module" and "communication node" in the monitor framework are two names of the same object in different contexts. In describing the context of communications technologies, it is generally referred to as a communications node or simply a node; in describing the physical objects in the monitor framework, they are generally referred to as monitor modules.
The invention provides a time division multiplex communication method for a steam turbine monitoring instrument, which divides a time domain into a plurality of small sections of periodic cycle, wherein the time length of each section is fixed; each communication node occupies a serial bus of the bus board in turn according to a convention sequence, each node transmits data to the bus in a specific time period, and the rest nodes which are not in the transmission time period receive the bus data; when a new communication node is added, the sending time interval of the node is analyzed and judged according to the existing communication condition on the bus.
Preferably, the time domain is periodic and cyclic, and the cycle period is determined according to the response time of the TSI meter; the time in each cycle is divided into equal-length segments, and the number of the divided segments is determined according to the maximum number of nodes possibly participating in communication in the TSI framework. Each monitor module in the TSI frame occupies the serial bus of the frame bus board in turn according to the sequence of the node number of the monitor module, and the node data is sent in the time period (phase) distributed in each time cycle. Each communication node has two working modes of interception and normal receiving and transmitting, wherein the interception mode only receives data on the bus, the normal receiving and transmitting mode transmits the data to the bus at a determined time interval according to the rule, and the other time intervals receive the data of the bus. The node newly joining communication enters a monitoring mode firstly, then the appropriate sending time interval of the node per se can be calculated according to the sending rule of the existing node on the bus, and the node enters a normal receiving and sending mode after the time value is stable and no other faults exist. When the communication node which has sent the sequence exits the communication, the allocated time interval is idle on the bus.
In addition, the nodes which are not in the sending state can receive the data sent by other nodes on the bus, and the efficiency of information exchange between the nodes is greatly improved by adopting a one-sending and multi-receiving communication mechanism. The CAN bus is used and conforms to CAN 2.0B protocol text. The communication node in normal operation can finely adjust the self sending time interval according to the communication time sequence of the bus. If a plurality of monitor modules send data at the same time due to accidents, arbitration is carried out according to the priority level of information, information with high level can be successfully sent, and other information is marked as failure.
The invention is further described below with reference to the following figures and specific examples:
the invention adopts a time division multiplex communication method to divide a time domain into a plurality of small sections of periodic cycle, and the time length of each section is fixed. The communication nodes occupy the bus board serial bus in turn according to a convention sequence, each node sends data to the bus in a specific time period, and the rest nodes which are not in the sending time period receive the bus data. When a new communication node is added, the sending time interval of the node is analyzed and judged according to the existing communication condition on the bus. Each node can not generate communication conflict on the bus, and the efficiency of data communication between the nodes is greatly improved due to the adoption of a one-sending and multi-receiving mechanism.
As shown in fig. 2, T1 is the time period during which a data frame is cycled on the bus, and is also the time period during which each node transmits data. This time is determined based on the response time of the monitoring module in the TSI meter to external input signals (self-sensor signals and signals generated by other monitoring modules). T2 is the time when a node transmits data, and in the present communication method, the data transmitted by each node is specified to be a fixed frame length. T3 is the interval time of data transmission between nodes. T4 is the beat time, which is determined by the communication cycle T1 and the maximum number of nodes on the bus. T5 is the adjustment time, and is generally an integral multiple of T4, T5 is eT4, and e is 1, 2, ….
T1 ═ N + e) T4 … … … … formula 1
In specific equipment, N is the maximum number of communication nodes in a TSI frame, and e is a fixed value of 0-2 according to communication requirements;
t4 is determined according to response time Tr, N value required by TSI, but is limited by bus rate Baud and data frame length L,
Figure BDA0003718624760000061
each node determines a transmission time period (phase) according to the node number of the node and the transmission time of the highest node number on the bus. Assume the highest node number (usually the node on the bus with the smallest node number) to be N 0 The transmission phase is t 0 Node number N of the module x Then the module sends a phase signal,
t x ＝(N x -N 0 )T4+t 0 … … … … formula 3
The node communication has two working modes: a listening mode and a normal transceiving mode.
When a new node joins in bus communication, the method firstly enters a listening mode, only listens to data on the bus in the listening mode, determines the highest node, and adjusts a self sending timer until the time phase of the highest node on the bus is in time (according to formula 3).
In the normal transceiving mode, data is transmitted according to a fixed period T1, and the time interval of the data is adjusted according to the data frame of the highest node on the bus, so that the time drift is avoided.
In order to realize the time division multiplexing communication method, as shown in fig. 3, there are three independent working processes: a communication receiving process 101, a communication monitoring process 102 and a communication sending process 103; the communication receiving is driven by data receiving interruption, and the communication monitoring and the communication sending are respectively driven by a T1 timer and a T2 timer; the initiation and timing of T2 is controlled by the communication monitoring process. The communication receiving process is shown in the attached figure 4: a record reception time stamp process 201 and a record reception data process 202; the timestamp of the received data is recorded by the internal time of the node, and is used for calculating the sending time of the node in the future, and the calculation principle is shown as (equation 3).
The communication monitoring process is shown in the attached figure 5: recording local timestamp processing 1, mode judgment 2, listening mode reception judgment 3, reception idle count 4, judgment of idle duration 5, normal mode (idle on bus) processing 6, continuation listening processing 7, time adjustment processing 8, time stabilization judgment 9, normal mode (bus has node) processing 10, normal mode reception judgment 11, normal mode time fine adjustment processing 12, and continuation normal mode processing 13. In snoop mode, if there are no other nodes on the bus, try N idle And after the beat time, actively entering a normal transceiving mode. And if other node data are received, carrying out phase adjustment according to the received time stamp and the local time stamp. And if the continuous multiple adjustment value is smaller than the allowable error, the module enters a normal transceiving mode. In the normal transceiving mode, mainly the synchronization error between the fine tuning and the highest level node. The communication sending process is simple, and data can be sent to the bus after each time of timing.
To sum up: the invention discloses a time division multiplex communication method of a turbine monitoring instrument, which divides a time domain into a plurality of small sections of periodic cycle, each communication node alternately occupies a serial bus of a TSI bus plate according to a convention sequence, data is sent to the bus in a specific time period, and the other nodes not in the sending time period receive the bus data. The communication nodes have two working modes of interception and normal receiving and sending, when a new communication node is added into the bus, the new communication node firstly enters the interception mode, and then enters the normal receiving and sending mode after analyzing and judging the sending time period of the node according to the existing communication condition on the bus. When the existing communication node exits from communication, the bus of the originally occupied time interval is kept idle, and the existence of the master control node is not needed in the whole communication process. Each node of the system can not generate communication conflict on the bus, and the efficiency of data communication between the nodes is greatly improved due to the adoption of a one-sending and multi-receiving mechanism.
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.

Claims (10)

1. A method for time division multiplex communication of a turbine monitoring instrument is characterized by comprising the following steps: dividing the time domain into a plurality of small segments of periodic cycle, wherein the time length of each segment is fixed; each communication node occupies the serial bus of the bus board in turn according to a convention sequence, each node transmits data to the bus in a specific time period, and the rest nodes which are not in the transmission time period receive the bus data; when a new communication node joins the bus, the sending time interval of the node is analyzed and judged according to the existing communication condition on the bus.
2. The method of time division multiplexing steam turbine monitoring instrumentation according to claim 1, wherein: the cycle of the circulation in the time domain is determined according to the response time of the TSI meter, the time in each circulation is divided into segments with equal length, and the number of the divided segments is determined according to the maximum number of nodes which can participate in communication in the TSI framework.
3. The method of time division multiplexing steam turbine supervisory instruments according to claim 2, wherein: and the modules in the TSI frame occupy the serial buses of the frame bus plates in turn according to the sequence of the node numbers of the modules, and the node data is sent in the time period/phase allocated to each time cycle.
4. The method of time division multiplexing steam turbine supervisory instruments according to claim 1, wherein: and a one-to-many receiving communication mechanism is adopted, so that the node which is not in a sending state can receive the data sent by other nodes on the bus.
5. The method of time division multiplexing steam turbine monitoring instrumentation according to claim 1, wherein: the bus uses a CAN bus and conforms to CAN 2.0B protocol text.
6. The method of time division multiplexing steam turbine monitoring instrumentation according to claim 1, wherein: each communication node has two working modes of interception and normal receiving and transmitting; and in the normal transceiving mode, the data is sent to the bus in a determined period according to the rule, and the data of the bus is received in the rest period.
7. The method of time division multiplexing steam turbine supervisory instruments according to claim 6, wherein: when a new communication node is added into the bus, the monitoring mode is firstly entered, then the appropriate sending time interval of the node per se is calculated according to the sending rule of the existing node on the bus, and the normal receiving and sending mode is entered after the time value is stable and no other faults exist.
8. The method of time division multiplexing steam turbine supervisory instruments according to claim 6, wherein: when the communication node which has sent the sequence exits the communication, the allocated time interval is idle on the bus.
9. The method of time division multiplexing steam turbine supervisory instruments according to claim 6, wherein: the communication node in the normal working mode can finely adjust the self sending time interval according to the communication time sequence of the bus.
10. The method of time division multiplexing steam turbine monitoring instrumentation according to claim 1, wherein: if a plurality of monitor modules send data at the same time due to accidents, arbitration is carried out according to the priority level of the information, the information with high level can be successfully sent, and other information is marked as failure.
CN202210742812.8A 2022-06-28 2022-06-28 Time division multiplex communication method for turbine monitoring instrument Pending CN115134185A (en)

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