CN220730653U - Heat exchange station control system - Google Patents
Heat exchange station control system Download PDFInfo
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- CN220730653U CN220730653U CN202322236146.3U CN202322236146U CN220730653U CN 220730653 U CN220730653 U CN 220730653U CN 202322236146 U CN202322236146 U CN 202322236146U CN 220730653 U CN220730653 U CN 220730653U
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Abstract
The utility model provides a heat exchange station control system, which relates to the technical field of heat supply and comprises a man-machine interaction interface group, a main controller group, an intermediate controller, a sensor and an actuator, wherein the main controller group comprises a first main controller and a second main controller, and the man-machine interaction interface group comprises a first man-machine interaction interface, a second man-machine interaction interface and an intermediate man-machine interaction interface; the sensor and the actuator are respectively communicated with the intermediate controller through hard wiring, serial communication or Ethernet, and the first main controller and the second main controller are respectively communicated with the intermediate controller through Ethernet; the first main controller is correspondingly configured with a first man-machine interaction interface, the second main controller is correspondingly configured with a second man-machine interaction interface, and the intermediate controller is correspondingly configured with an intermediate man-machine interaction interface. The control framework provided by the utility model can take over the main control role of the main control controller by other controllers when the main control controller is in fault or technology upgrading, so that the running reliability and continuity of the heat exchange station are ensured.
Description
Technical Field
The utility model relates to the technical field of heat supply, in particular to a heat exchange station control system.
Background
The heat exchange station in the heat supply engineering generally adopts a Programmable Logic Controller (PLC) as main control equipment, the PLC collects sensor signals in the heat exchange station, and outputs control instructions to an actuator (such as a valve and a frequency converter) according to manual input or established control logic, so that the operation control and adjustment of a process system are realized. The heat exchange station typically employs a single set of PLCs as the master controller, with the input and output signals from the PLCs coming directly from the field instrumentation.
However, in some cases, the conventional control architecture cannot fully meet the functional requirements, for example, in some heat exchange stations that need to continuously expand or upgrade the system software and hardware according to the change of the heat supply requirements, not only needs to develop and debug new technologies, but also needs to keep the original PLC and its internal program as a "bottom-of-the-way" guarantee. For another example, the heat exchange station generally has a longer design life, but the provider of the PLC and the control program of the heat exchange station generally does not provide the source program for the operation unit, if the provider enterprise stops maintaining or loses the related program for a long time, the maintenance of the software and hardware of the main control system of the heat exchange station by the owner will be difficult to control, and once the main control system fails in the heating period, the main control system of the heat exchange station can be recovered for a long time, so that the quality of stopping heating or heating is reduced, and the normal production and life of the resident and the heat using unit are affected.
Disclosure of Invention
Aiming at the problems, a heat exchange station control system is provided, which comprises a man-machine interaction interface group, a main controller group, an intermediate controller, a sensor and an actuator, wherein,
the man-machine interaction interface group comprises a first man-machine interaction interface, a second man-machine interaction interface and an intermediate man-machine interaction interface;
the sensor and the executor are respectively communicated with the intermediate controller through hard wiring, serial communication or Ethernet, and the first main controller and the second main controller are respectively communicated with the intermediate controller through Ethernet;
the first main controller is correspondingly configured with the first man-machine interaction interface, the second main controller is correspondingly configured with the second man-machine interaction interface, and the intermediate controller is correspondingly configured with the intermediate man-machine interaction interface.
Optionally, the first main controller, the second main controller and the intermediate controller are PLC products of the same model or different models.
Optionally, the first man-machine interaction interface, the second man-machine interaction interface and the intermediate man-machine interaction interface are software and hardware that allow a person to interact with the controller, and include:
touch screen devices, buttons, switches, network interfaces and protocols that can transmit remote instructions.
Optionally, the intermediate controller is configured to:
collecting sensor signals and storing the sensor signals in an operation memory;
and when the intermediate controller takes over the main control right, controlling the executor according to the control instruction of the intermediate human-computer interaction interface.
Optionally, the intermediate controller is further configured to:
transferring the master control authority according to the request signal of the first master controller or the second master controller;
when the first main controller or the second main controller is in main control, the executor is controlled according to the control instruction of the first main controller or the second main controller;
and continuously monitoring the state of the first main controller or the second main controller when the first main controller or the second main controller is in a fault state or can not communicate, and automatically taking over the main control authority by the intermediate controller when the first main controller or the second main controller is found to be in a fault state or can not communicate.
The technical scheme provided by the embodiment of the utility model at least has the following beneficial effects:
by adding a plurality of main controllers and intermediate controllers, when a certain controller needs to exit the main control and enter a following state due to factors such as failure or technical upgrading, the main control role of the certain controller can be safely and quickly taken over by other controllers, so that the continuous and stable work of a process system is ensured, the failure shutdown of a heat exchange station is not caused, and when the abnormal work is found after the control program is upgraded and the certain controller is put into operation again, the normal working state of the heat exchange station can be recovered in a short time by quickly recovering the main control of the other controllers.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of an architecture of a heat exchange station control system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram illustrating a data flow in operational mode E according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram illustrating a data flow in operational mode A according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram illustrating data flow in operational mode B according to an embodiment of the present utility model;
FIG. 5 is a flow chart illustrating a switch from mode E to mode A of operation in accordance with an embodiment of the present utility model;
FIG. 6 is a flow chart illustrating active exit of operational mode A to mode E according to an embodiment of the present utility model;
fig. 7 is a flow chart illustrating the passive exit of operating mode a to mode E according to an embodiment of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
As shown in fig. 1, the heat exchange station control system comprises a man-machine interaction interface group, a main controller group, an intermediate controller E, a sensor and an actuator, wherein the main controller group comprises a first main controller a and a second main controller B, and the man-machine interaction interface group comprises a first man-machine interaction interface hmi_a, a second man-machine interaction interface hmi_b and an intermediate man-machine interaction interface hmi_e.
In the embodiment of the utility model, the sensor and the actuator are respectively connected with the intermediate controller E, the first main controller a and the second main controller B are respectively communicated with the intermediate controller E through an ethernet, the first main controller a correspondingly configures the first man-machine interaction interface hmi_a, the second main controller B correspondingly configures the second man-machine interaction interface hmi_b, and the intermediate controller E correspondingly configures the intermediate man-machine interaction interface hmi_e.
It should be noted that the number of the main controllers in the main controller group is not only the first main controller a and the second main controller B, and more main controllers can be accessed according to actual requirements.
In this embodiment of the present application, the controllers communicate through ethernet, which may be both through cable connection and wireless communication, and the actuator and the sensor communicate with the intermediate controller through hard wiring, serial port communication or ethernet, respectively, and the first hmi_a, the second hmi_b and the intermediate hmi_e are software and hardware that allow interaction between a person and the controller, including:
touch screen devices, buttons, switches, network interfaces and protocols that can transmit remote instructions.
In the embodiment of the application, the hard wire refers to directly transmitting analog signals such as 4-20 mA current, 0-5V voltage and the like through a cable, and the serial port communication comprises a Modbus protocol based on an RS485 bus.
As shown in the architecture of fig. 1, the intermediate controller E is connected with the field instrument and the executing mechanism, the main controllers a and B are not connected with the field instrument and the executing mechanism, the intermediate controller E collects sensor signals and stores the sensor signals in the running memory, and receives external control instructions to output effective control signals to the field executing mechanism according to a set working mode. That is, all control commands must be issued through the intermediate controller E, and the control commands of the main controllers A and B are not directed to the actuators.
It should be noted that in the embodiment of the present utility model, the control programs executed by the main controllers a and B may be the same or different, and preferably, the main controllers a and B execute different control programs, and in addition, under the current architecture design, the controllers A, B and E are connected by a communication manner, and only a commonly supported communication protocol is required to be adopted to form an effective control architecture, so that these controllers may be PLC products of the same brand series or completely different manufacturer brands.
In addition, the working modes of the heat exchange station control system provided by the utility model are three:
mode E: the intermediate controller E hosts, followed by the master controllers a and B. In this mode, the main controller A, B does not make decisions or logic operations, does not issue instructions to the intermediate controller E, but makes its control instructions follow the control instructions issued by the intermediate controller E, and the heat exchange station control instructions are sent from the hmi_e to the actuator via the intermediate controller E.
That is, the heat exchange station in this mode operates as a manual control via the intermediate controller E, and the actual control behavior is comparable to the main controller A, B being split so that only the intermediate controller E is present.
Mode a: the master controller A is used for master control, the master controller B is used for following, and the intermediate controller E is used for executing. In this mode, the intermediate controller E forwards control instructions from the main controller a to the actuator, and the main controller a may operate in a manual mode or in an automatic mode, where the main controller B follows the intermediate controller E.
Mode B: the master controller B is used for master control, the master controller A follows, and the intermediate controller E executes. In this mode, E forwards control commands from the master controller B to the actuators, which can be operated in manual mode or in automatic mode, where the master controller a follows the intermediate controller E.
It should be noted that the above operation modes may be switched. In mode E, the master controller a or B may issue a take-over master request to the controller E, which determines that the system is allowed to switch to mode a or B after take-over. In mode a or B, the master controller a or B may actively request to the controller E to exit the master, or the controller E will take over the master when it finds that the controller a or B is malfunctioning or unable to communicate.
An embodiment is given below for describing in detail the heat exchange station control system according to the present utility model.
A set of Siemens S7 1200 series PLC is originally adopted as a main controller for a certain heat exchange station. The heat exchange station is used for providing heating hot water for office buildings and dormitory buildings currently, but is also planned to heat a certain production workshop in the future. Different from living heating, the heating load fluctuation of the production workshop is large, the original living heating-oriented heat exchange station operation control mode cannot be fully applied, and the control framework of the heat exchange station is adjusted according to the technical scheme of the utility model in consideration of the needs of future control logic upgrading and debugging.
In this embodiment, a set of siemens S7 1214C PLC (1214C CPU with an analog input AI/output AO module and a digital input DI/output DO module) is used as the intermediate controller E, and two sets of siemens S7 1212C CPU are used as the main controllers a and B, respectively, and the main controllers a and B are not equipped with AI/AO/DI/DO modules because they DO not need to directly collect data from the field devices.
In this embodiment, three sets of PLCs communicate via an ethernet switch based on the Profinet protocol. The intermediate controller E collects sensor signals through AI and DI modules and stores them in a program data block DBE_I, A and B read the data in the DBE_I program block and store them in program data blocks DBE_A and DBE_B, which is equivalent to A, B indirectly collecting field sensor signals, and the intermediate controller E sets a special data block DBE_O_T to place final control instructions, which are sent to the field executor through AO and DO modules of E.
In addition, a dedicated data block dbe_o_a and a dedicated data block dbe_o_b are provided in E, respectively, to store control instructions from A, B, and a dedicated data block dbe_o_e stores control instructions from an input device directly connected to E, such as hmi_e.
As shown in fig. 2, the system is started by default in the mode E when the intermediate controller E is in the master control state, the main controllers a and B are in the following state, the intermediate controller E continuously transmits the control command in the dbe_o_e to the dbe_o_t, the control command received by the field executor is from the intermediate controller E, and the control command data blocks dba_o and dbb_o in the main controllers a and B directly read and copy the data of the control command data block dbe_o_t in the intermediate controller E.
In fig. 2, solid arrows indicate control command flow directions, light dashed arrows indicate field acquisition data flow directions, and deep dashed arrows indicate command data flow directions.
As shown in fig. 3 and 5, when it is desired to make the master controller a act as a master or it is required to enter the operation mode a, a signal is sent to the intermediate controller E by the master controller a to request to take over the master, the intermediate controller E determines whether to allow taking over after receiving the request signal, allows taking over when the system is in the operation mode E to reply to the "grant" signal, if taking over is ignored/refused when the system is in the operation mode a or B, then the master controller a sends its control instruction stored in the dba_o to the dbe_o_a data block of the E, and the intermediate controller E continuously transmits the control instruction in the dbe_o_a to the dbe_o_t, at which time the control instruction received by the on-site execution mechanism is actually originated from the master controller a.
At this time, if the master controller B sends a signal to the intermediate controller E to request to take over the master control, the intermediate controller E will reject the request of B because the system is in the a master control state, and if the master control state of the master controller a needs to be released, the controller E sends an exit master control instruction to the master controller a or the master controller a sends an exit master control request to the intermediate controller E, refer to fig. 6.
Then, the main controller a automatically enters the following state after exiting the main controller, and the intermediate controller E automatically enters the main control state, i.e. the working mode E, and at this time, if the main controller B sends a signal requesting to take over the main control, the main controller B will be agreed by the intermediate controller E, so that the system enters the main control state of the main controller B, i.e. the system is converted into the working mode B, as shown in fig. 4.
In addition, as shown in fig. 7, when the system is in the working mode a, the intermediate controller E continuously monitors the state of the main controller a, and when the controller a is found to be in a fault state or cannot communicate, the intermediate controller E automatically switches the state of the intermediate controller to the E main control state. Thus, the present structure allows one of A or B to fail or disconnect without affecting the proper operation of the heat exchange station. When A, B fails at the same time, the system automatically enters the E main control state, and the heat exchange station can still safely operate.
In the embodiment of the utility model, when a technician updates the upgrade control program in a staged manner, the master controller A can be placed in the master controller to upgrade the program of the master controller B, then the master controller B is switched to be used as the master controller, whether the heat exchange station operates according to expected logic is tested and verified, if the heat exchange station is abnormal, the master controller A is switched back to be used as the master controller, the control program of the master controller B is improved, then the master controller B is switched to be used as the master controller to be tested and verified again, and the process is repeated until the work is abnormal, and the master controller B can be kept to be used as the master controller. And when the control program needs to be continuously updated later, taking the main controller A as an upgrading object, and repeating the process in the same way. It can be seen that by alternately improving and upgrading the two controllers of A, B, the heat exchange station can be ensured to always have a control program with a controller running version earlier but verified, so that the control program always has a 'rollback' option, and the running reliability and continuity of the heat exchange station are well ensured.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present utility model may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present utility model are achieved, and the present utility model is not limited herein.
The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (5)
1. A heat exchange station control system is characterized by comprising a man-machine interaction interface group, a main controller group, an intermediate controller, a sensor and an actuator, wherein,
the man-machine interaction interface group comprises a first man-machine interaction interface, a second man-machine interaction interface and an intermediate man-machine interaction interface;
the sensor and the executor are respectively communicated with the intermediate controller through hard wiring, serial communication or Ethernet, and the first main controller and the second main controller are respectively communicated with the intermediate controller through Ethernet;
the first main controller is correspondingly configured with the first man-machine interaction interface, the second main controller is correspondingly configured with the second man-machine interaction interface, and the intermediate controller is correspondingly configured with the intermediate man-machine interaction interface.
2. The system of claim 1, wherein the first master controller, the second master controller and the intermediate controller are the same model of PLC product or are different models of PLC product.
3. The system of claim 1, wherein the first human-machine interface, the second human-machine interface, and the intermediate human-machine interface are software and hardware that allow human interaction with a controller, comprising:
touch screen devices, buttons, switches, network interfaces and protocols that can transmit remote instructions.
4. The system of claim 1, wherein the intermediate controller is configured to:
collecting sensor signals and storing the sensor signals in an operation memory;
and when the intermediate controller takes over the main control right, controlling the executor according to the control instruction of the intermediate human-computer interaction interface.
5. The system of claim 1, wherein the intermediate controller is further configured to:
transferring the master control authority according to the request signal of the first master controller or the second master controller;
when the first main controller or the second main controller is in main control, the executor is controlled according to the control instruction of the first main controller or the second main controller;
and continuously monitoring the state of the first main controller or the second main controller when the first main controller or the second main controller is in a fault state or can not communicate, and automatically taking over the main control authority by the intermediate controller when the first main controller or the second main controller is found to be in a fault state or can not communicate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322236146.3U CN220730653U (en) | 2023-08-18 | 2023-08-18 | Heat exchange station control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322236146.3U CN220730653U (en) | 2023-08-18 | 2023-08-18 | Heat exchange station control system |
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| CN220730653U true CN220730653U (en) | 2024-04-05 |
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| CN202322236146.3U Active CN220730653U (en) | 2023-08-18 | 2023-08-18 | Heat exchange station control system |
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- 2023-08-18 CN CN202322236146.3U patent/CN220730653U/en active Active
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