CN116527737B - Multi-input single-output network connection control method for PLC single-threaded system in industrial control environment - Google Patents
Multi-input single-output network connection control method for PLC single-threaded system in industrial control environment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L67/00—Network arrangements or protocols for supporting network services or applications
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention discloses a multi-input single-output network connection control method of a PLC single-threaded system in an industrial control environment, which provides a design mode of two timers of a queue, processes a batch of service instance instances after enabling the timers to take effect, but does not return to a PLC control logic immediately; after the disable timer is validated, only the saved service instance is returned to the PLC control logic for processing. When the PLC network connection is realized, the batch processing mode in the scene of the multi-input single-output network is needed to be designed, then the instance number of the instance is gradually returned to the PLC control logic, the time used by the whole flow is short, the conflict can not occur in the assigned address, the equipment communication efficiency is high, the application engineers and the technical support engineers are helped to complete the network connection and control rapidly and reliably, and the problem that partial instance is lost in the PLC control logic due to the fact that the rhythm is too fast is avoided while the efficiency is ensured.
Description
Technical Field
The invention belongs to the technical field of industrial control communication, and particularly relates to a PLC single-thread system multi-input single-output network connection control method in an industrial control environment.
Background
As industrial internet applications become more widespread, the connection of industrial control devices becomes more complex. The PLC as a control core is composed of an upper computer of control logic written by an engineer, a controlled driver, a motor, an adapter, an IO module, a touch screen and the like (collectively called a controlled end), and is generally connected with a switch to form a local area network together, so that the requirement of interconnection and intercommunication is met. As shown in fig. 1, the controlled terminal device is used as a client, and the PLC is connected as a server. The control logic in the PLC generally creates tasks with different periods according to the types of the controlled terminal devices, and the tasks are connected with the controlled terminal devices with different types at different moments after starting. The controlled end devices of the same type have similar processing flows, and the time for initiating network connection is very close.
At present, industrial control mainly comprises a single-thread mode and a multi-thread mode, because the multi-thread needs the support of a multi-core CPU, the single-thread can use the single-core CPU and the multi-core CPU, the multi-thread design is higher in complexity, the shared data needs to be used with cautions, the single-thread design is simple and safe, resources are saved, and the multi-thread control is suitable for scenes with high requirements on robustness, so that the effect of the system can be improved by the multi-thread, and at present, a plurality of industrial control scenes mostly use single threads Cheng Changjing.
At the same time, for a single-threaded environment, the same functional block or task can only handle one connection at a time. (refer to PLC equipment of AB corporation) for example, when implementing Modbus TCP using a ladder diagram (Modbus is an industrial bus protocol standard, is an application layer thermal insulation transmission protocol, and includes ASCII, RTU, TCP message types; modbus TCP represents that data is transmitted in Modbus frame format based on ethernet TCP/IP), the general operation steps of the server are as follows:
1. a socket is created, and a corresponding instance (instance number) is obtained.
2. The controlled end as the client is connected with the PLC as the service end.
3. And reading or writing data depending on the connection after the connection is successful.
4. The instance (instance number) is deleted after the task is completed.
In summary, when the industrial control device in the industrial internet single-threaded environment is connected to the network, the following characteristics are presented:
1. for the same task, the control logic of the PLC is a serial process when handling the network connection.
2. For different tasks, the time when a plurality of controlled end devices of the same type are connected to the PLC is close, and the time when the controlled end devices of different types are connected to the PLC can be different.
AB A series of PLCs adopts a strategy for allowing only one controlled terminal device to be connected with the PLC in a specified time aiming at the situation, namely: in a certain period of time, when a plurality of controlled terminal devices try to connect the network to the PLC, only the first controlled terminal device initiating the network connection is allowed to connect to the PLC, the instance (instance number) of the network connection is obtained, and the PLC control logic performs read-write operation on the instance to keep the network connection or delete the network connection according to actual conditions. After the operation is finished or the time is overtime, the control logic waits for the connection of the next controlled terminal, and the steps are repeated. After the controlled terminal equipment fails to connect, the controlled terminal equipment can retry after a few seconds until the network connection with the server terminal is established. The scheme provides a targeted solution, but the whole network connection process of the scheme has the defects of long time consumption and low efficiency, and the more the number of controlled terminal devices is, the more the connection failure times are, the more the communication irrelevant to tasks is in the whole local area network, and the normal operation of other services can be influenced in serious cases.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for controlling the connection of a PLC single-thread system multi-input single-output network in an industrial control environment, which is suitable for controlling the connection of a single-thread system multi-input single-output network.
A PLC single-thread system multiple-input single-output network connection control method in an industrial control environment comprises the following steps: firstly, creating an instance queue, a disabling timer and an enabling timer;
the instance queue is used for storing instance numbers;
an enabling timer for the PLC as the service end to receive the connection of the client end during the timing period, generating an instance number for the connection and adding the instance number to the end of the instance queue;
the forbidden timer is used for the PLC to take the instance number from the instance queue during the timing period and return the instance number to the PLC control logic for task processing;
then creating a server connection based on TCP, taking a corresponding PLC as a server, and performing connection control on the client by the PLC based on the created instance queue, the forbidden timer and the enabled timer:
s1, starting an enabling timer to count, and waiting for connection of a client;
s2, when a client is connected to the PLC server, resetting an enabling timer, simultaneously distributing an instance number for the current connection and adding the instance number to the end of an instance queue;
s3, after the enabling timer is overtime, the enabling timer is closed, the disabling timer is opened, the connection of the client is not accepted any more, and an example number is taken out from the first of the example queue at intervals during the timing of the disabling timer and returned to the PLC control logic for task processing;
s4, closing the forbidden timer after the forbidden timer is overtime, opening the forbidden timer, and repeating the steps S1-S4.
In the scheme, through the creation of one queue and two timers, when the connection control of the PLC and the controlled end is realized, a connection task can be divided into two processes of connection and processing, one timer realizes connection, and one timer realizes processing, and meanwhile, one queue is used for realizing the butt joint of the two, so that the connection time consumption can be greatly shortened, and the service execution efficiency of the whole system is improved.
In the method for controlling the multi-input single-output network connection of the PLC single-threaded system in the industrial control environment, in the step S4, when the forbidden timer is not overtime, but the example queue is empty, the forbidden timer is closed in advance, the enabled timer is opened, and the steps S1-S4 are repeated.
In the method for controlling the multiple-input single-output network connection of the PLC single-threaded system in the industrial control environment, in step S2, after the connection of the client is received in the timing period of one enable timer and the instance number is successfully added into the instance queue, the timing duration of the enable timer is modified to be N times of the previous timing duration, N is a positive number smaller than 1, and then the enable timer is reset to continue waiting for the connection of the next client.
In the method for controlling the multi-input single-output network connection of the PLC single-threaded system in the industrial control environment, in the step S2, if a client is connected to the PLC server in the timing duration period of each enabling timer, the enabling timer is reset;
and after each reset, the timing duration of the enabling timer is modified to be N times of the previous time.
When a plurality of clients need to be connected, the timing time of the enabling timer is continuously shortened, the connection and processing relation can be balanced, and the problems of efficiency reduction or missing of examples and the like caused by any accumulation and no processing are avoided.
In the method for controlling the multi-input single-output network connection of the PLC single-threaded system in the industrial control environment, when the enabling timer is turned off and turned on again each time, the timing duration of the enabling timer is the initial duration.
In the method for controlling the multi-input single-output network connection of the PLC single-threaded system in the industrial control environment, after each reset, N times of the current timing duration is calculated, if the calculation result is smaller than a minimum set value, an enabling timer is closed, and a disabling timer is started; if the calculation result is greater than or equal to the minimum set value, continuing to modify the timing duration to be the calculation result and waiting for the connection of the client.
In the method for controlling the multi-input single-output network connection of the PLC single-threaded system in the industrial control environment, the timing duration of the enabling timer is modified each time to be half of the timing duration of the previous enabling timer, namely, n=0.5.
In the method for controlling multiple-input single-output network connection of the PLC single-threaded system in the industrial control environment, in step S2, when the enable timer is restarted each time, the timing duration of the enable timer is in an initial state, and if no client connection is received in the first timing duration period of the enable timer, the timing duration of the enable timer is M times as long as before, M is a value greater than 1 until the client connection is received in the timing period, and if the client connection is received in the timing duration period, the enable timer is reset, and the timing duration of the enable timer is determined to be the latest modified duration, or is revised to be in the initial state. And in a timing period after resetting the enabling timer, namely, in a first timing period after not restarting the enabling timer, if the client connection is not received in the timing period, the timing period is not modified any more, the enabling timer is directly closed, and the step S3 is entered. If the client connection is received in the timing period, the timing duration of the enabling timer is modified to be N times of the previous time.
In the method for controlling the multi-input single-output network connection of the PLC single-threaded system in the industrial control environment, if no client connection is received in the first timing duration period of the enabling timer, the timing duration of the enabling timer is modified to be M times of the previous one until the client connection is received in the timing period or the duration reaches the maximum set value; if the duration reaches the maximum set value, closing the enabling timer and opening the disabling timer; if the timing duration is not connected with the client, calculating the modified timing duration, if the timing duration is smaller than or equal to the maximum set value, continuing to modify the timing duration, waiting for the connection of the client, and if the timing duration is greater than the maximum set value, ending the enabling timer, starting the enabling timer, closing the enabling timer, and starting the disabling timer.
Each modification enables the duration of the timer to be 2 times the previous, i.e. m=2.
In the method for controlling the multi-input single-output network connection of the PLC single-threaded system in the industrial control environment, in the step S1, the element types in the created instance queue are signed integer types, and the element types are used for storing instance numbers generated when a controlled end of a client type is connected with a PLC server;
the disabling timer and the enabling timer are both aperiodic timers;
when creating a TCP-based server connection, presetting a related function.
The invention has the advantages that: providing a design mode of two timers of a queue, and processing a batch of service instance instances after enabling the timers to take effect, but not returning to the PLC control logic immediately; after the disable timer is validated, only the saved service instance is returned to the PLC control logic for processing. When the PLC network connection is realized, the batch processing mode in the scene of the multi-input single-output network is needed to be designed, then the instance number of the instance is gradually returned to the PLC control logic, the time used in the whole flow is short, the conflict of the assigned address can not occur, the equipment communication efficiency is high, and the application engineers and the technical support engineers are helped to complete the network connection and control rapidly and reliably. The two timers in one queue can ensure the efficiency and simultaneously avoid the problem that partial instances of the PLC control logic are lost due to too fast rhythm.
Drawings
FIG. 1 is a schematic diagram showing the connection between a PLC as a server and a plurality of controlled terminals as clients;
FIG. 2 is a second schematic diagram of the connection of a PLC to a plurality of devices;
fig. 3 is a flowchart of a method for controlling the connection of multiple input and single output networks of a PLC single-threaded system in an industrial control environment according to the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 2 and 3, this embodiment proposes a solution for a single-thread processing device that needs to be designed as a multiple-input single-output network connection control when implementing a PLC network connection:
1. creating a queue, wherein the element type is signed Integer (INT) for storing instance number instance generated when the controlled end of the client type is connected with the PLC server. Known as instance queues.
2. A disable timer is created during which the accept function of the PLC server is disabled. The function of the disable timer is to disable the accept function of the PLC server during the time counting.
Another enabling timer is created, and the accept service of the PLC server is enabled during the timing period of the enabling timer. The function of the enabling timer is to start the accept service of the PLC service during the time counting.
The disable timer and the enable timer are both aperiodic timers.
3. And creating a server-side connection based on TCP according to the use condition, taking the PLC as a server-side, completing port binding operation (bind), temporarily starting network interception (listen) and connection waiting (accept), starting to count by starting an enabling timer, then starting a network interception (listen) and connection waiting (accept) function, and waiting for the connection of the client-side.
Bind has completed before the enable timer is started, and listen, accept is not enabled. After the enable timer is started, listen, accept is sequentially enabled. Once the accept phase is entered means that all readiness is ready. The intention of disabling here is that the connection of the client is not allowed to be handled before the enable timer starts, in order to avoid that the subsequent interaction queue loses connection information.
And during the execution of the enabling timer, allowing the system to call the accpet so as to connect the client, caching information obtained by the accpet by the system, adding the client information into an instance queue, closing functions related to the accpet when the enabling timer is closed and the disabling timer is opened after overtime, and taking out the information in the instance queue for processing. The rejected client typically repeats multiple attempts to connect to the server until successful (or user-defined logic is executed).
4. The open enable timer starts counting, during which the accept function is started waiting for the client to connect.
5. According to FIG. 4, when the first client is connected to the server, the enable timer is reset to restart counting, and the PLC as the server allocates an instance number to represent the connection, and pushes the instance number to the end of the instance queue. The push and pop mentioned herein and later are computer terms, with respect to linear tables such as queues, there are two opposite basic operations, push is a new creation of an element and save to the end of the queue; pop is an element that deletes the beginning of the queue.
6. According to 5, if other clients are connected to the server before the enable timer times out, the enable timer is reset again, and the generated instance numbers are pushed to the end of the instance queue in turn.
7. According to 5, after the enable timer has timed out, the disable timer is opened, at which time the accept function is disabled, and this phase no longer accepts the client's connection. The client is connected in a waiting state, and the client is usually connected again after a set time.
8. According to 4, if the enabling timer does not receive any client connection in the first timing period after being opened, modifying the timing duration of the enabling timer to be 2 times the previous duration, and so on until the client connection is received in the timing period, but the longest time is not longer than 10 seconds, and if the client connection is not received yet after the timing period of the timer is prolonged by more than 10 seconds, closing the enabling timer, and opening the disabling timer. When the enabling timer is started next time, the time is still counted from an initial state, for example, the initial time length is 1s, the time length is started from 1s as the time length, the time length is prolonged if the client connection is not received in the time length period, and otherwise, the time length is 1 s. And (3) receiving the connection of the client in the first timing period which is prolonged or not prolonged, resetting the enabling timer, entering the second timing period, wherein the timing duration is based on the latest modified duration, for example, the initial state is 1s, the client connection is only when the client is prolonged to 4s, the subsequent timing duration is based on 4s, and the timing duration is not modified no matter whether the client is connected or not. Due to the fact that the service end is difficult to perceive the actual connection condition, proper waiting time can be found through the method, and processing efficiency is improved in a self-adaptive waiting time mode.
9. According to 4, if there is no client connection for a prescribed time, the disable timer is opened after the enable timer expires.
10. According to fig. 8, if the server receives the connection of the client and succeeds in a timing period, the timing duration of the modification enabling timer is one half of the previous duration, but the shortest time is not less than 100 ms.
11. During the time of the disable timer, the PLC processes the instance queue. The method comprises the following steps:
12. every other period of time (depending on the task period of the PLC processing the corresponding connection), the first element pop of the instance queue is popped into the PLC connection task.
13. According to FIG. 12, when the instance queue is not empty, multiple instance instances can be pop within the disable timer count period, i.e., the PLC can process T/T instance instances during this period. Wherein T is the timing period of the forbidden timer, and T is the task period of the corresponding connection of the PLC processing. The initial timing length of the disable timer and the enable timer is determined by one skilled in the art according to specific situations, and the preferred timing length of the disable timer can handle a number of tasks.
14. According to 12, after the disable timer times out, the above operation is not performed, the enable timer is opened again, and the operations of 4 to 12 are repeated.
15. According to FIG. 12, when the instance queue is empty and the pop operation fails, the disable timer is allowed to close in advance, the enable timer is opened, and operations 4 through 12 are repeated.
The specific embodiments described in this application are merely illustrative of the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A PLC single-thread system multiple-input single-output network connection control method in an industrial control environment is characterized by comprising the following steps: firstly, creating an instance queue, a disabling timer and an enabling timer;
the instance queue is used for storing instance numbers;
the enabling timer is used for enabling the PLC serving as the service end to receive the connection of the client end in a timing period of the PLC serving as the service end, generating an instance number for the connection and adding the instance number to the end of the instance queue;
the forbidden timer is used for the PLC to take the instance number from the instance queue in the timing period and return the instance number to the PLC control logic for task processing;
then creating a server connection based on TCP, taking a corresponding PLC as a server, and performing connection control on the client by the PLC based on the created instance queue, the forbidden timer and the enabled timer:
s1, starting an enabling timer to count, and waiting for connection of a client;
s2, when a client is connected to the PLC server, resetting an enabling timer, simultaneously distributing an instance number for the current connection and adding the instance number to the end of an instance queue;
s3, after the enabling timer is overtime, closing the enabling timer, opening the disabling timer, taking out an instance number from the first instance queue at intervals in the timing period of the disabling timer, and returning the instance number to the PLC control logic for task processing;
s4, closing the forbidden timer after the forbidden timer is overtime, opening the forbidden timer, and repeating the steps S1-S4.
2. The method for controlling multiple-input single-output network connection of a PLC single-threaded system in an industrial control environment according to claim 1, wherein in step S4, when the disable timer is not timed out but the instance queue is empty, the disable timer is closed in advance, the enable timer is opened, and steps S1 to S4 are repeated.
3. The method for controlling multiple-input single-output network connection of PLC single-threaded system in industrial control environment according to claim 2, wherein in step S2, after receiving the connection of the client in the timing period of one enable timer and successfully adding the instance number to the instance queue, the timing period duration of the enable timer is modified to be N times the previous timing period duration, N is a positive number smaller than 1, and then the enable timer is reset to continue waiting for the connection of the next client.
4. The method for controlling multiple-input single-output network connection of PLC single-threaded system in industrial control environment according to claim 3, wherein in step S2, if a client is connected to the PLC server in each timing period of the enable timer, the enable timer is reset;
and after each reset, the time length of the timing period of the enabling timer is modified to be N times of the previous time.
5. The method for controlling multiple-input single-output network connection of a PLC single-threaded system in an industrial control environment according to claim 4, wherein the timing period duration of the enable timer is an initial duration each time the disable timer is turned off and the enable timer is turned on again.
6. The method for controlling the multi-input single-output network connection of the PLC single-threaded system in the industrial control environment according to claim 5, wherein after each reset, N times of the duration of the current timing period is calculated, if the calculation result is smaller than a minimum set value, an enabling timer is closed, and a disabling timer is started; if the calculation result is greater than or equal to the minimum set value, continuing to modify the time period duration to be the calculation result and waiting for the connection of the client.
7. The method for controlling multiple-input single-output network connection of PLC single-threaded system in industrial control environment according to claim 6, wherein the time period of each modification enable timer is half of the time period of the previous enable timer, i.e., n=0.5.
8. The method for controlling multiple-input single-output network connection of PLC single-threaded system in industrial control environment according to any one of claims 1 to 7, wherein in step S2, each time the enable timer is restarted, the time period of the enable timer is in an initial state, and if no client connection is received in the first time period of the enable timer, the time period of the enable timer is modified to be M times as long as before, and M is a value greater than 1 until the client connection is received in the time period, and then the enable timer is reset, and the time period of the enable timer is determined to be the latest modified time period, or is revised to be in the initial state.
9. The method for controlling multiple-input single-output network connection of PLC single-threaded system in industrial control environment according to claim 8, wherein if no client connection is received in the first timing period of the enable timer, the duration of the timing period of the enable timer is modified to be M times of the previous duration until the client connection is received in the timing period or the duration reaches the maximum set value; if the duration reaches the maximum set value, closing the enabling timer and opening the disabling timer;
each modification enables the duration of the timer to be 2 times the previous, i.e. m=2.
10. The method for controlling the multi-input single-output network connection of the PLC single-threaded system in the industrial control environment according to claim 1, wherein in the step S1, the element types in the created instance queue are signed integer type, and the element types are used for storing instance numbers generated when a controlled end of a client type is connected with a PLC server;
the disabling timer and the enabling timer are both aperiodic timers;
when creating a TCP-based server connection, presetting a related function.
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