CN108614491B - Communication system and method for programmable logic controller - Google Patents
Communication system and method for programmable logic controller Download PDFInfo
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- CN108614491B CN108614491B CN201810595672.XA CN201810595672A CN108614491B CN 108614491 B CN108614491 B CN 108614491B CN 201810595672 A CN201810595672 A CN 201810595672A CN 108614491 B CN108614491 B CN 108614491B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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- G05B2219/24215—Scada supervisory control and data acquisition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The embodiment of the invention discloses a communication system and a communication method of a programmable logic controller. Wherein, this system includes: the system comprises a programmable logic controller, at least one remote communication module and at least two remote expansion modules corresponding to the remote communication modules, wherein each remote expansion module is connected in advance step by step; the remote communication module receives the remote service data packet sent by the programmable logic controller, sends the remote service data packet to a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, acquires remote return data packets of the remote expansion modules according to the timeout waiting time, generates a remote feedback data packet, and sends the remote feedback data packet to the programmable logic controller. The technical scheme of the embodiment of the invention can judge whether each remote expansion module works normally or not in time and locate the remote expansion module with fault when the input and output terminals of the programmable logic controller are increased through the remote expansion modules.
Description
Technical Field
The embodiment of the invention relates to the technology of a programmable logic controller, in particular to a communication system and a communication method of the programmable logic controller.
Background
With the development of industrial technology and the improvement of automation degree, the application of programmable logic controllers (Programmable Logic Controller, PLCs) is increasing. A programmable logic controller is a digital operation electronic system designed specifically for application in an industrial environment. It adopts a programmable memory, in its interior is stored the instruction for executing logic operation, sequence control, timing, counting and arithmetic operation, etc. and utilizes digital or analog input and output to control various mechanical equipments or production processes. Programmable logic controllers are a core part of industrial control. For field industrial applications, one or more programmable logic controllers must be used for each application. In some applications, the logic is not very complex, but the number of input and output terminals is large, and the local expansion module of the programmable logic controller cannot meet the service requirement.
In the prior art, input and output terminals of a programmable logic controller are increased by adding a plurality of remote expansion modules.
The inventors have found that the following drawbacks exist in the prior art in the process of implementing the present invention: the plurality of remote expansion modules communicate through a shared bus, when there is erroneous data from a damaged remote expansion module on the bus, the bus breaks down, and the programmable logic controller cannot timely know the position of the remote expansion module with the problem.
Disclosure of Invention
The invention provides a communication system and a communication method of a programmable logic controller, which are used for realizing the timely positioning of a remote expansion module with faults while increasing input and output terminals of the programmable logic controller.
In a first aspect, an embodiment of the present invention provides a communication system of a programmable logic controller, including:
the system comprises a programmable logic controller, at least one remote communication module and at least two remote expansion modules corresponding to the remote communication modules, wherein each remote expansion module is connected in advance step by step;
the programmable logic controller is used for sending the remote service data packet to the remote communication module, acquiring a remote feedback data packet sent by the remote communication module, and judging whether each remote expansion module works normally or not according to the remote feedback data packet;
the remote communication module is used for receiving the remote service data packet, sending the remote service data packet to a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, acquiring remote return data packets of the remote expansion modules sent by the first-stage remote expansion module according to the timeout waiting time, generating a remote feedback data packet, and sending the remote feedback data packet to the programmable logic controller;
And the at least two remote expansion modules are used for acquiring the remote service data packet sent by the remote communication module or the upper-level remote expansion module, sending the remote service data packet to the lower-level remote expansion module after extracting the corresponding remote service data from the remote service data packet, generating a remote return data packet according to the corresponding remote service data, and sending the remote return data packet sent by the remote return data packet and the lower-level remote expansion module to the remote communication module or the upper-level remote expansion module.
In a second aspect, an embodiment of the present invention further provides a communication method of a programmable logic controller, including:
the remote communication module receives the remote service data packet sent by the programmable logic controller, sends the remote service data packet to a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, and sets overtime waiting time according to preset time;
the remote communication module obtains remote return data packets of the remote expansion modules sent by the first-stage remote expansion module according to the timeout waiting time, generates remote feedback data packets, and sends the remote feedback data packets to the programmable logic controller.
According to the technical scheme, the remote communication module receives the remote service data packet sent by the programmable logic controller, the remote service data packet is sent to a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, the remote return data packet of each remote expansion module sent by the first-stage remote expansion module is obtained according to the timeout waiting time, a remote feedback data packet is generated, and the remote feedback data packet is sent to the programmable logic controller, so that the programmable logic controller can judge whether each remote expansion module works normally according to the remote feedback data packet, and can judge whether each remote expansion module works normally in time while the input and output terminals of the programmable logic controller are increased through the remote expansion module, and the remote expansion module with faults is located.
Drawings
Fig. 1 is a schematic structural diagram of a communication system of a programmable logic controller according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a communication system of a programmable logic controller according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a communication system of a programmable logic controller according to a third embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a communication system of a programmable logic controller according to a fourth embodiment of the present invention;
FIG. 5 is a flowchart of a communication method of a programmable logic controller according to a fifth embodiment of the present invention;
fig. 6 is a flowchart of a communication method of a programmable logic controller according to a sixth embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a schematic structural diagram of a communication system of a programmable logic controller according to a first embodiment of the present invention, where the embodiment is applicable to a case where the programmable logic controller communicates with a remote expansion module, as shown in fig. 1, the system includes:
the system comprises a programmable logic controller 101, at least one remote communication module 102 and at least two remote expansion modules 103 corresponding to the remote communication module 102, wherein each remote expansion module 103 is connected step by step in advance.
The programmable logic controller 101 is configured to send a remote service data packet to the remote communication module 102, obtain a remote feedback data packet sent by the remote communication module 102, and determine whether each remote expansion module 103 works normally according to the remote feedback data packet.
The remote communication module 102 is configured to receive a remote service data packet, send the remote service data packet to a first-stage remote expansion module of at least two remote expansion modules 103 corresponding to the remote communication module 102, obtain remote return data packets of each remote expansion module 103 sent by the first-stage remote expansion module according to a timeout waiting time, generate a remote feedback data packet, and send the remote feedback data packet to the programmable logic controller 101.
And the at least two remote expansion modules 103 corresponding to the remote communication modules are used for acquiring the remote service data packet sent by the remote communication module 102 or the previous-stage remote expansion module, after the corresponding remote service data is extracted from the remote service data packet, sending the remote service data packet to the next-stage remote expansion module, generating a remote return data packet according to the corresponding remote service data, and sending the remote return data packet sent by the remote return data packet and the next-stage remote expansion module to the remote communication module 102 or the previous-stage remote expansion module.
Wherein the programmable logic controller 101 sends the remote service data packet to the remote communication module 102. The remote service data packet includes remote service data corresponding to each remote expansion module 103, where the remote service data is used to instruct the corresponding remote expansion module 103 to complete a corresponding operation. After the remote communication module 102 receives the remote service data packet, the remote service data packet is sent to a first-stage remote expansion module in at least two remote expansion modules 103 corresponding to the remote communication module 102, and timeout waiting time is set according to preset time. After the first-stage remote expansion module obtains the remote service data packet sent by the remote communication module 102, the first-stage remote expansion module extracts the corresponding remote service data from the remote service data packet, sends the remote service data packet to the next-stage remote expansion module, generates a remote return data packet according to the corresponding remote service data, and sends the remote return data packet to the remote communication module 102. The remote return data packet includes feedback data generated after the corresponding remote expansion module 103 processes the remote service data and completes corresponding operation according to the remote service data.
After the next-stage remote expansion module obtains the remote service data packet sent by the previous-stage remote expansion module, the corresponding remote service data is extracted from the remote service data packet, the remote service data packet is sent to the next-stage remote expansion module of the next-stage remote expansion module, a remote return data packet is generated according to the corresponding remote service data, and the remote return data packet is sent to the previous-stage remote expansion module. If the next-stage remote expansion module is the last-stage remote expansion module corresponding to the remote communication module 102, the remote service data packet is not sent to the next-stage remote expansion module.
The previous-stage remote expansion module continues to send the remote return data packet sent by the next-stage remote expansion module to the previous-stage remote expansion module of the previous-stage remote expansion module until the remote return data packet is transferred to the first-stage remote expansion module, and then the first-stage remote expansion module sends the remote return data packet to the remote communication module 102. If the previous-stage remote expansion module is the first-stage remote expansion module, the first-stage remote expansion module directly sends the remote return data packet to the remote communication module 102.
The remote communication module 102 obtains the remote return data packet of each remote expansion module 103 sent by the first-stage remote expansion module according to the timeout waiting time, generates a remote feedback data packet, and sends the remote feedback data packet to the programmable logic controller 101. The programmable logic controller 101 acquires a remote feedback data packet sent by the remote communication module 102, and determines whether each remote expansion module 103 works normally according to the remote feedback data packet.
Specifically, the remote communication module 102 obtains a remote return data packet of each remote expansion module 103 sent by the first-stage remote expansion module; the remote communication module 102 determines whether a timeout wait time has been reached; if the timeout waiting time is reached, the remote communication module 102 further determines whether the remote return packet corresponding to each remote expansion module 103 has been acquired; if the remote communication module 102 has acquired the remote return data packet corresponding to each remote extension module 103, generating a remote feedback data packet according to the remote return data packet corresponding to each remote extension module 103, and sending the remote feedback data packet to the programmable logic controller 101; if the remote communication module 102 does not acquire the remote return data packet corresponding to each remote extension module 103, checking the acquired remote return data packet, and determining the remote extension module 103 corresponding to the remote return data packet which is not acquired; generating corresponding error mark information according to a remote extension module 103 corresponding to the unobtained remote return data packet; a remote feedback packet is generated from the acquired remote feedback packet and error flag information, and is transmitted to the programmable logic controller 101.
Specifically, the programmable logic controller 101 acquires a remote feedback data packet sent by the remote communication module 102, judges whether the remote feedback data packet includes a remote return data packet corresponding to each remote expansion module 103, and determines that each remote expansion module 103 corresponding to the remote communication module 102 works normally if the remote feedback data packet includes a remote return data packet corresponding to each remote expansion module 103; if the remote feedback data packet does not include the remote return data packet corresponding to each remote expansion module 103, but includes error flag information, the corresponding remote expansion module is determined according to the error flag information. The corresponding remote expansion module is the remote expansion module with faults.
The programmable logic controller 101 is a digital operation electronic system designed specifically for use in an industrial environment. The remote control system adopts a programmable memory, stores instructions for executing logic operation, sequence control, timing, counting, arithmetic operation and other operations in the programmable memory, transmits remote service data packets to the remote communication module 102 through digital or analog input and output, acquires remote feedback data packets transmitted by the remote communication module 102, and judges whether each remote expansion module 103 works normally according to the remote feedback data packets.
Optionally, the programmable logic controller 101 is connected to the remote communication module 102 through a bus.
The remote communication module 102 includes a communication chip and a micro control unit (Microcontroller Unit, MCU). The remote communication module 102 receives the remote service data packet through the communication chip, sends the remote service data packet to a first-stage remote expansion module in at least two remote expansion modules 103 corresponding to the remote communication module 102, and obtains a remote return data packet of each remote expansion module 103 sent by the first-stage remote expansion module. The remote communication module 102 generates a remote feedback data packet according to the timeout waiting time and the remote return data packet of each remote expansion module 103 through the MCU, and then sends the remote feedback data packet to the programmable logic controller 101 through the communication chip.
Optionally, the remote communication module 102 is connected to a first-stage remote expansion module of at least two remote expansion modules 103 corresponding to the remote communication module 102 through two data lines. The two data lines are used for data reading and data writing respectively. The two data lines are connected by differential signals so as to improve the anti-interference capability. Data input and data output between the remote communication module 102 and a first-stage remote expansion module of at least two remote expansion modules 103 corresponding to the remote communication module 102 are completed through two data lines.
Optionally, the remote communication module 102 and a first-stage remote expansion module of at least two remote expansion modules 103 corresponding to the remote communication module 102 perform communication transmission in a full duplex manner.
At least two remote expansion modules 103 corresponding to the remote communication module 102 include a communication chip and an MCU. The remote expansion module 103 obtains the remote service data packet sent by the remote communication module 102 or the previous remote expansion module 103 through the communication chip. After the remote expansion module 103 extracts the corresponding remote service data from the remote service data packet through the MCU, the remote service data packet containing the extracted residual remote service data is sent to the next-stage remote expansion module through the communication chip, and the remote return data packet sent by the next-stage remote expansion module 103 is obtained. Optionally, the remote expansion module 103 extracts the corresponding remote service data from the remote service data packet using a direct memory access (Direct Memory Access, DMA) controller in the MCU. The remote expansion module 103 processes the remote service data through the MCU, and after generating a remote return data packet, the remote return data packet and the remote return data packet sent by the next-stage remote expansion module are sent to the remote communication module 102 or the previous-stage remote expansion module through the communication chip.
Optionally, the upper-stage remote expansion module is connected with the lower-stage remote expansion module through two data lines. The two data lines are used for data reading and data writing respectively. The two data lines are connected by differential signals so as to improve the anti-interference capability. And the data input and the data output between the upper-stage remote expansion module and the lower-stage remote expansion module are completed through two data lines.
Optionally, the upper-level remote expansion module and the lower-level remote expansion module perform communication transmission in a full duplex mode.
According to the communication system of the programmable logic controller, the remote communication module receives the remote service data packet sent by the programmable logic controller, the remote service data packet is sent to the first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, the remote return data packet of each remote expansion module sent by the first-stage remote expansion module is obtained according to the timeout waiting time, the remote feedback data packet is generated, and the remote feedback data packet is sent to the programmable logic controller, so that the programmable logic controller can judge whether each remote expansion module works normally according to the remote feedback data packet, and can timely judge whether each remote expansion module works normally or not while the input and output terminals of the programmable logic controller are increased through the remote expansion module, and the remote expansion module with faults is located.
Example two
Fig. 2 is a schematic structural diagram of a communication system of a programmable logic controller according to a second embodiment of the present invention, where the remote communication module 102 is optimized based on the above embodiment: as shown in fig. 2, the remote communication module 102 includes a first communication unit 104, a second control unit 105, and a second communication unit 106; a first communication unit 104, configured to receive the remote service data packet, and send the remote service data packet to the second control unit 105; a second control unit 105 for sending the remote service data packet to the second communication unit 106; the second communication unit 106 is configured to send the remote service data packet to the first-stage remote expansion module, obtain remote return data packets of each remote expansion module sent by the first-stage remote expansion module, and send the remote return data packets of each remote expansion module to the second control unit 105; the second control unit 105 is further configured to generate a remote feedback data packet according to the timeout waiting time and the remote return data packet of each remote expansion module, and send the remote feedback data packet to the first communication unit 104; the first communication unit 104 is further configured to receive the remote feedback data packet, and send the remote feedback data packet to the programmable logic controller.
Wherein, after receiving the remote service data, the first communication unit 104 sends the remote service data packet to the second control unit 105. The second control unit 105 sends the remote service data packet to the second communication unit 106. The second communication unit 106 sends the remote service data packet to the first-stage remote expansion module, obtains the remote return data packet of each remote expansion module sent by the first-stage remote expansion module, and sends the remote return data packet of each remote expansion module to the second control unit 105. The second control unit 105 generates a remote feedback packet according to the timeout waiting time and the remote return packet of each remote expansion module, and sends the remote feedback packet to the first communication unit 104. After receiving the remote feedback data packet, the first communication unit 104 sends the remote feedback data packet to the programmable logic controller.
Specifically, the second control unit 105 acquires a remote return packet of each remote expansion module, and determines whether the timeout waiting time has been reached. If the timeout waiting time is reached, the second control unit 105 further determines whether the remote return packet corresponding to each remote expansion module has been acquired; if the remote return data packet corresponding to each remote expansion module is acquired, generating a remote feedback data packet according to the remote return data packet corresponding to each remote expansion module; if the remote return data packet corresponding to each remote extension module is not acquired, checking the acquired remote return data packet, and determining the remote extension module corresponding to the remote return data packet which is not acquired; generating corresponding error mark information according to a remote expansion module corresponding to the unobtained remote return data packet; and generating a remote feedback data packet according to the acquired remote feedback data packet and the error mark information.
Optionally, the first communication unit 104 includes a communication chip, the second control unit 105 includes an MCU, and the second communication unit 106 includes a communication chip.
According to the communication system of the programmable logic controller, after the first communication unit receives remote service data, the second communication unit sends the remote service data packet to the first-stage remote expansion module, and obtains remote return data packets of all remote expansion modules sent by the first-stage remote expansion module, the second control unit generates remote feedback data packets according to the timeout waiting time and the remote return data packets of all remote expansion modules, and the first communication unit sends the remote feedback data packets to the programmable logic controller, so that the working state of all remote expansion modules can be timely fed back to the programmable logic controller through the remote feedback data packets while the data transmission of the programmable logic controller and the remote expansion modules is completed.
Example III
Fig. 3 is a schematic structural diagram of a communication system of a programmable logic controller according to a third embodiment of the present invention, where at least two remote expansion modules corresponding to remote communication modules are optimized based on the above embodiment: as shown in fig. 3, at least two remote expansion modules corresponding to the remote communication module include: the first-stage remote expansion module 107 and the second-stage remote expansion module 108 are connected step by step; the first stage remote expansion module 107 includes: a third communication unit 109, a third control unit 110, and a fourth communication unit 111; a third communication unit 109, configured to obtain a remote service data packet sent by the remote communication module 102, and send the remote service data packet to a third control unit 110; the third control unit 110 is configured to extract corresponding remote service data from the remote service data packet, send the remote service data packet to the fourth communication unit 111, generate a first remote return data packet according to the corresponding remote service data, and send the first remote return data packet to the third communication unit 110; a fourth communication unit 111, configured to send the remote service data packet to the second-stage remote expansion module 108; the third communication unit 109 is further configured to send the first remote return data packet to the remote communication module 102; the second level remote expansion module 108 includes: a fifth communication unit 112 and a fourth control unit 113; a fifth communication unit 112, configured to obtain the remote service data packet sent by the fourth communication unit 111, and send the remote service data packet to the fourth control unit 113; a fourth control unit 113, configured to generate a second remote return data packet according to the corresponding remote service data after extracting the corresponding remote service data from the remote service data packet, and send the second remote return data packet to the fifth communication unit 112; the fifth communication unit 112 is further configured to send the second remote return packet to the fourth communication unit 111; a fourth communication unit 111, configured to send a second remote return packet to the third control unit 110; the third control unit 110 is further configured to send the second remote return data packet to the third communication unit 109; the third communication unit 109 is further configured to send the second remote return data packet to the remote communication module 102.
The third communication unit 109 obtains the remote service data packet sent by the remote communication module 102, and sends the remote service data packet to the third control unit 110. After extracting the corresponding remote service data from the remote service data packet, the third control unit 110 sends the remote service data packet to the fourth communication unit 111, generates a first remote return data packet according to the corresponding remote service data, and sends the first remote return data packet to the third communication unit 110. The fourth communication unit 111 transmits the remote service data packet transmitted from the third control unit 110 to the fifth communication unit 112 of the second-stage remote expansion module 108. The third communication unit 109 transmits the first remote return packet transmitted by the third control unit 110 to the remote communication module 102. The fifth communication unit 112 acquires the teleservice data packet transmitted from the fourth communication unit 111, and then transmits the teleservice data packet to the fourth control unit 113. After extracting the corresponding remote service data from the remote service data packet, the fourth control unit 113 generates a second remote return data packet according to the corresponding remote service data, and sends the second remote return data packet to the fifth communication unit 112. The fifth communication unit 112 transmits the second remote return packet to the fourth communication unit 111. The fourth communication unit 111 transmits the second remote return packet to the third control unit 110. The third control unit 110 sends the second remote return data packet to the third communication unit 109. The third communication unit 109 sends the second remote return data packet to the remote communication module 102. The remote communication module 102 generates a remote feedback packet according to the timeout waiting time, the first remote return packet and the second remote return packet, and sends the remote feedback packet to the programmable logic controller 101.
Optionally, the third communication unit 109 includes a communication chip, the third control unit 110 includes an MCU, the fourth communication unit 111 includes a communication chip, the fifth communication unit 112 includes a communication chip, and the fourth control unit 113 includes an MCU.
Specifically, the remote communication module 102 obtains a remote return packet sent by the first-stage remote expansion module 107. The remote communication module 102 determines whether a timeout wait time has been reached. If the timeout wait time is reached, the remote communication module 102 further determines whether a remote return packet corresponding to each remote expansion module has been acquired: a first remote return data packet and a second remote return data packet; if the remote communication module 102 has acquired the remote return data packet corresponding to each remote extension module, generating a remote feedback data packet according to the first remote return data packet and the second remote return data packet, and sending the remote feedback data packet to the programmable logic controller 101; if the remote communication module 102 does not acquire the remote return data packet corresponding to each remote extension module, checking the acquired remote return data packet, and determining the remote extension module corresponding to the remote return data packet which is not acquired; generating corresponding error mark information according to a remote expansion module corresponding to the unobtained remote return data packet; a remote feedback packet is generated from the acquired remote feedback packet and error flag information, and is transmitted to the programmable logic controller 101.
For example, the remote communication module 102 does not acquire the remote return data packet corresponding to each remote extension module, checks the acquired first remote return data packet, determines that the second remote return data packet is not acquired, determines the secondary remote extension module 108 corresponding to the second remote return data packet is not acquired, generates corresponding error flag information according to the secondary remote extension module 108, generates a remote feedback data packet according to the acquired first remote return data packet and the error flag information corresponding to the secondary remote extension module 108, and then sends the remote feedback data packet to the programmable logic controller 101. The programmable logic controller 101 obtains the remote feedback data packet sent by the remote communication module 102, and determines that the second-stage remote expansion module 108 is a failed remote expansion module according to the error flag information corresponding to the second-stage remote expansion module 108 in the remote feedback data packet.
According to the communication system of the programmable logic controller, the first-stage remote expansion module and the second-stage remote expansion module are connected step by step, the remote communication module generates the remote feedback data packet according to the timeout waiting time, the first remote return data packet and the second remote return data packet, and sends the remote feedback data packet to the programmable logic controller, so that the input and output terminals of the programmable logic controller can be increased through the first-stage remote expansion module and the second-stage remote expansion module, and meanwhile, whether the first-stage remote expansion module and the second-stage remote expansion module work normally or not can be judged in time, and the remote expansion module with faults is located.
Example IV
Fig. 4 is a schematic structural diagram of a communication system of a programmable logic controller according to a fourth embodiment of the present invention, where the communication system of the programmable logic controller is optimized based on the above embodiment: as shown in fig. 4, the programmable logic controller communication system further includes at least one local expansion module 114; and the at least one local expansion module 114 is connected with the programmable logic controller 101 and is used for acquiring the corresponding local service data packet sent by the programmable logic controller 101, generating a local feedback data packet according to the corresponding local service data packet, and sending the local feedback data packet to the programmable logic controller 101.
The programmable logic controller 101 is optimized: as shown in fig. 4, the programmable logic controller 101 includes a first control unit 115, a local communication unit 116, and a remote communication unit 117; a first control unit 115 for generating a local service data packet and a remote service data packet, transmitting the local service data packet to the local communication unit 116, and transmitting the remote service data packet to the remote communication unit 117; the local communication unit 116 is configured to send the local service data packet to the local expansion module 114, obtain a local feedback data packet sent by the local expansion module 114, and send the local feedback data packet to the first control unit 115; the remote communication unit 117 is configured to send a remote service data packet to the remote communication module 102, obtain a remote feedback data packet sent by the remote communication module 102, and send the remote feedback data packet to the first control unit 115; the first control unit 115 is further configured to obtain a local feedback data packet sent by the local communication unit 116 and a remote feedback data packet sent by the remote communication unit 117, and determine whether the local expansion module 114 and each remote expansion module 103 work normally according to the local feedback data packet and the remote feedback data packet, respectively.
Wherein the first control unit 115 generates a local service data packet and a remote service data packet and transmits the local service data packet to the local communication unit 116 and the remote service data packet to the remote communication unit 117. The local communication unit 116 sends the local service data packet to the local extension module 114, acquires the local feedback data packet sent by the local extension module 114, and sends the local feedback data packet to the first control unit 115. The remote communication unit 117 transmits the remote service data packet to the remote communication module 102, and acquires the remote feedback data packet transmitted by the remote communication module 102, and transmits the remote feedback data packet to the first control unit 115. The first control unit 115 obtains the local feedback data packet sent by the local communication unit 116 and the remote feedback data packet sent by the remote communication unit 117, and determines whether the local expansion module 114 and each remote expansion module 103 work normally according to the local feedback data packet and the remote feedback data packet, respectively.
The local expansion module 114 includes a communication chip and an MCU. The local extension module 114 obtains the local service data packet sent by the local communication unit 116 through the communication chip. The local service data packet includes local service data corresponding to the local extension module 114. The local service data is used to instruct the corresponding local expansion module 114 to complete the corresponding operation. The local expansion module 114 processes the local service data after extracting the corresponding local service data from the local service data packet through the MCU, and sends the local return data packet to the local communication unit 116 through the communication chip after generating the local return data packet.
Optionally, the local expansion module 114 is connected to the local communication unit 116 via a bus.
The first control unit 115 obtains the local feedback packet, and determines whether the local expansion module 114 works normally according to the local feedback packet. The local feedback data packet includes a corresponding pair of local expansion modules 114
And processing the local service data, and generating feedback data after corresponding operation is completed according to the local service data.
The remote communication module 102 acquires the remote return data packet of each remote expansion module 103 according to the timeout waiting time, generates a remote feedback data packet, and transmits the remote feedback data packet to the remote communication unit 117. The first control unit 115 obtains a remote feedback data packet, and determines whether each remote expansion module 103 works normally according to the remote feedback data packet.
According to the communication system of the programmable logic controller, the local feedback data packet sent by the local communication unit and the remote feedback data packet sent by the remote communication unit are obtained through the first control unit, whether the local expansion module and each remote expansion module work normally or not is judged according to the local feedback data packet and the remote feedback data packet, and the local expansion module and the remote expansion module can be timely judged to work normally while the input and output terminals of the programmable logic controller are increased through the local expansion module and the remote expansion module, so that the remote expansion module with faults is located.
Example five
Fig. 5 is a flowchart of a communication method of a programmable logic controller according to a fifth embodiment of the present invention, where the embodiment is applicable to a case where the programmable logic controller communicates with a remote expansion module, and the method can be applied to a communication system of a programmable logic controller according to the foregoing embodiment of the present invention. Referring to fig. 5, it specifically includes the following steps:
step 501, the remote communication module receives the remote service data packet sent by the programmable logic controller, sends the remote service data packet to a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, and sets timeout waiting time according to preset time.
The programmable logic controller sends the remote service data packet to the remote communication module. The remote service data packet contains remote service data corresponding to each remote expansion module, and the remote service data is used for indicating the corresponding remote expansion module to complete corresponding operation. After the remote communication module receives the remote service data packet, the remote service data packet is sent to a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, and timeout waiting time is set according to preset time.
The preset time is set according to the service requirement. And setting timeout waiting time according to the preset time. For example, the preset time is 3 minutes, and the timeout waiting time is set to 3 minutes. The timeout waiting time is the waiting time of the remote communication module to acquire the remote return data packet of each remote expansion module sent by the first-stage remote expansion module. When the timeout waiting time is not reached, the remote communication module continuously acquires the remote return data packet of each remote expansion module transmitted by the first-stage remote expansion module; when the timeout waiting time is reached, the remote communication module further judges whether the remote return data packet corresponding to each remote expansion module is acquired.
Step 502, the remote communication module obtains remote return data packets of each remote expansion module sent by the first-stage remote expansion module according to the timeout waiting time, generates remote feedback data packets, and sends the remote feedback data packets to the programmable logic controller.
The remote communication module acquires remote return data packets of each remote expansion module sent by the first-stage remote expansion module. The remote communication module determines whether a timeout waiting time has been reached. If the timeout waiting time is reached, the remote communication module further judges whether the remote return data packet corresponding to each remote expansion module is acquired. If the remote communication module has acquired the remote return data packet corresponding to each remote extension module, generating a remote feedback data packet according to the remote return data packet corresponding to each remote extension module, and sending the remote feedback data packet to the programmable logic controller; if the remote communication module does not acquire the remote return data packet corresponding to each remote extension module, checking the acquired remote return data packet, and determining the remote extension module corresponding to the remote return data packet which is not acquired; generating corresponding error mark information according to a remote expansion module corresponding to the unobtained remote return data packet; and generating a remote feedback data packet according to the acquired remote feedback data packet and the error mark information, and sending the remote feedback data packet to the programmable logic controller.
The programmable logic controller acquires a remote feedback data packet sent by the remote communication module, judges whether the remote feedback data packet contains a remote return data packet corresponding to each remote expansion module, and determines that each remote expansion module corresponding to the remote communication module works normally if the remote feedback data packet contains the remote return data packet corresponding to each remote expansion module; if the remote feedback data packet does not contain the remote return data packet corresponding to each remote expansion module, but contains error marking information, the corresponding remote expansion module is determined according to the error marking information. The corresponding remote expansion module is the remote expansion module with faults.
According to the communication method of the programmable logic controller, the remote service data packet is sent to the first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication modules through the remote communication modules, the remote return data packet of each remote expansion module is obtained according to the timeout waiting time, the remote feedback data packet is generated, and the remote feedback data packet is sent to the programmable logic controller, so that the programmable logic controller can judge whether each remote expansion module works normally according to the remote feedback data packet, and the working state of each remote expansion module can be timely fed back to the programmable logic controller through the remote feedback data packet when the data transmission between the programmable logic controller and the remote expansion modules is completed.
Example six
Fig. 6 is a flowchart of a communication method of a programmable logic controller according to a sixth embodiment of the present invention, where step 502 is optimized based on the above embodiment: the remote communication module obtains remote return data packets of each remote expansion module sent by the first-stage remote expansion module according to the timeout waiting time, and generates remote feedback data packets, which comprise; the remote communication module acquires remote return data packets of each remote expansion module sent by the first-stage remote expansion module; the remote communication module judges whether the overtime waiting time is reached; if the timeout waiting time is reached, the remote communication module further judges whether the remote return data packet corresponding to each remote expansion module is acquired or not; and if the remote communication module has acquired the remote return data packet corresponding to each remote expansion module, generating a remote feedback data packet according to the remote return data packet corresponding to each remote expansion module.
As shown in fig. 6, the method includes:
step 601, the remote communication module receives the remote service data packet sent by the programmable logic controller, sends the remote service data packet to a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, and sets timeout waiting time according to preset time.
Step 602, the remote communication module obtains remote return data packets of each remote expansion module sent by the first-stage remote expansion module.
The remote communication module acquires remote return data packets of each remote expansion module sent by the first-stage remote expansion module through the communication chip. The remote communication module is connected with a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module through two data wires. The two data lines include: a data read line and a data write line. The two data lines are connected by adopting differential signals, so that the anti-interference capability is improved.
Step 603, the remote communication module determines whether the timeout waiting time is reached.
The remote communication module sets timeout waiting time after transmitting the remote service data packet to a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, and judges whether the timeout waiting time is reached according to the current time in the process of acquiring the remote return data packet of each remote expansion module transmitted by the first-stage remote expansion module.
In step 604, if the timeout waiting time is reached, the remote communication module further determines whether the remote return data packet corresponding to each remote extension module has been acquired.
If the timeout waiting time is reached, the remote communication module further judges whether the remote return data packet corresponding to each remote expansion module is acquired. Optionally, the remote communication module determines whether the remote return data packet corresponding to each remote extension module is acquired according to the number of the acquired remote return data packets. The remote communication module judges whether the number of the acquired remote return data packets is consistent with the number of all remote expansion modules corresponding to the remote communication module. If the number of the obtained remote return data packets is consistent with the number of all remote expansion modules corresponding to the remote communication modules, determining that the remote communication modules have obtained the remote return data packets corresponding to each remote expansion module; if the number of the acquired remote return data packets is inconsistent with the number of all remote extension modules corresponding to the remote communication modules, the missing remote return data packets are indicated, and the remote communication modules are determined to not acquire the remote return data packets corresponding to each remote extension module.
And if the timeout waiting time is not reached, the remote communication module continuously acquires the remote return data packet of each remote expansion module transmitted by the first-stage remote expansion module.
Step 605, if the remote communication module has acquired the remote return data packet corresponding to each remote extension module, generating a remote feedback data packet according to the remote return data packet corresponding to each remote extension module, and sending the remote feedback data packet to the programmable logic controller.
And if the remote communication module has acquired the remote return data packet corresponding to each remote extension module, packaging all acquired remote return data packets, generating a remote feedback data packet, and transmitting the remote feedback data packet to the programmable logic controller. The programmable logic controller acquires a remote feedback data packet sent by the remote communication module, determines whether the remote feedback data packet contains a remote return data packet corresponding to each remote expansion module, and then determines that the remote feedback data packet contains the remote return data packet corresponding to each remote expansion module, and determines that each remote expansion module corresponding to the remote communication module works normally.
Optionally, after the remote communication module further determines whether the remote return data packet corresponding to each remote extension module has been acquired if the timeout waiting time is reached, the method further includes: if the remote communication module does not acquire the remote return data packet corresponding to each remote extension module, checking the acquired remote return data packet, and determining the remote extension module corresponding to the remote return data packet which is not acquired; generating corresponding error mark information according to a remote expansion module corresponding to the unobtained remote return data packet; and generating a remote feedback data packet according to the acquired remote feedback data packet and the error mark information.
If the remote communication module does not acquire the remote return data packet corresponding to each remote extension module, the acquired remote return data packet is checked to determine the remote return data packet which is not acquired, and the remote extension module corresponding to the remote return data packet which is not acquired is determined. And then generating corresponding error mark information according to the remote expansion module corresponding to the unobtained remote return data packet. The error mark information is used for indicating that the corresponding remote expansion module fails and does not return the remote return data packet. And packaging the acquired remote return data packet and the error mark information, generating a remote feedback data packet, and sending the remote feedback data packet to the programmable logic controller. The programmable logic controller acquires a remote feedback data packet sent by the remote communication module, judges whether the remote feedback data packet contains a remote return data packet corresponding to each remote expansion module, and then determines that the remote feedback data packet does not contain the remote return data packet corresponding to each remote expansion module but contains error mark information, and determines that the corresponding remote expansion module is a remote expansion module with a fault according to the error mark information.
According to the communication method of the programmable logic controller, whether the timeout waiting time is reached is judged through the remote communication module in the process of acquiring the remote return data packet of each remote expansion module; if the timeout waiting time is reached, further judging whether the remote return data packet corresponding to each remote expansion module is acquired; if the remote return data packet corresponding to each remote expansion module is acquired, generating a remote feedback data packet according to the acquired remote return data packet, and feeding back whether each remote expansion module timely sends the remote return data packet to the programmable logic controller through the remote feedback data packet when completing data transmission between the programmable logic controller and the remote expansion modules so that the programmable logic controller can determine the working state of each remote expansion module.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A programmable logic controller communication system, comprising:
the system comprises a programmable logic controller, at least one remote communication module and at least two remote expansion modules corresponding to the remote communication modules, wherein each remote expansion module is connected in advance step by step;
the programmable logic controller is used for sending a remote service data packet to the remote communication module, acquiring a remote feedback data packet sent by the remote communication module, and judging whether each remote expansion module works normally or not according to the remote feedback data packet; the programmable logic controller acquires a remote feedback data packet sent by the remote communication module and judges whether the remote feedback data packet contains a remote return data packet corresponding to each remote expansion module or not; if the remote feedback data packet contains a remote return data packet corresponding to each remote expansion module, the programmable logic controller determines that each remote expansion module corresponding to the remote communication module works normally; if the remote feedback data packet does not contain the remote return data packet corresponding to each remote expansion module but contains error marking information, the programmable logic controller determines the corresponding remote expansion module according to the error marking information, and the corresponding remote expansion module is a remote expansion module with faults;
The remote communication module is used for receiving the remote service data packet, sending the remote service data packet to a first-stage remote expansion module in the at least two remote expansion modules corresponding to the remote communication module, acquiring remote return data packets of the remote expansion modules sent by the first-stage remote expansion module according to timeout waiting time, generating a remote feedback data packet, and sending the remote feedback data packet to the programmable logic controller;
the remote service data packet is sent to the next-stage remote expansion module after the corresponding remote service data is extracted from the remote service data packet, a remote return data packet is generated according to the corresponding remote service data, and the remote return data packet sent by the next-stage remote expansion module are sent to the remote communication module or the previous-stage remote expansion module.
2. The system of claim 1, wherein the remote communication module comprises a first communication unit, a second control unit, and a second communication unit;
The first communication unit is configured to receive the remote service data packet, and send the remote service data packet to the second control unit;
the second control unit is configured to send the remote service data packet to the second communication unit;
the second communication unit is configured to send the remote service data packet to the first-stage remote expansion module, obtain remote return data packets of the remote expansion modules sent by the first-stage remote expansion module, and send the remote return data packets of the remote expansion modules to the second control unit;
the second control unit is further configured to generate a remote feedback data packet according to the timeout waiting time and the remote return data packet of each remote extension module, and send the remote feedback data packet to the first communication unit;
the first communication unit is further configured to receive the remote feedback data packet, and send the remote feedback data packet to the programmable logic controller.
3. The system of claim 1, wherein the at least two remote expansion modules corresponding to the remote communication module comprise: the system comprises a first-stage remote expansion module and a second-stage remote expansion module, wherein the first-stage remote expansion module and the second-stage remote expansion module are connected step by step.
4. The system of claim 3, wherein the first stage remote expansion module comprises: a third communication unit, a third control unit and a fourth communication unit;
the third communication unit is configured to obtain a remote service data packet sent by the remote communication module, and send the remote service data packet to the third control unit;
the third control unit is configured to extract corresponding remote service data from the remote service data packet, send the remote service data packet to the fourth communication unit, generate a first remote return data packet according to the corresponding remote service data, and send the first remote return data packet to the third communication unit;
the fourth communication unit is configured to send the remote service data packet to the second-stage remote expansion module;
the third communication unit is further configured to send the first remote return data packet to the remote communication module.
5. The system of claim 4, wherein the second level remote expansion module comprises: a fifth communication unit and a fourth control unit;
the fifth communication unit is configured to obtain the remote service data packet sent by the fourth communication unit, and send the remote service data packet to the fourth control unit;
The fourth control unit is configured to generate a second remote return data packet according to the corresponding remote service data after extracting the corresponding remote service data from the remote service data packet, and send the second remote return data packet to the fifth communication unit;
the fifth communication unit is further configured to send the second remote return packet to the fourth communication unit;
the fourth communication unit is further configured to send the second remote return packet to the third control unit;
the third control unit is further configured to send the second remote return packet to the third communication unit;
the third communication unit is further configured to send the second remote return data packet to the remote communication module.
6. The system of claim 1, further comprising at least one local expansion module;
the at least one local expansion module is connected with the programmable logic controller and is used for acquiring a corresponding local service data packet sent by the programmable logic controller, generating a local feedback data packet according to the corresponding local service data packet and sending the local feedback data packet to the programmable logic controller.
7. The system of claim 6, wherein the programmable logic controller comprises a first control unit, a local communication unit, and a remote communication unit;
the first control unit is configured to generate a local service data packet and a remote service data packet, send the local service data packet to the local communication unit, and send the remote service data packet to the remote communication unit;
the local communication unit is configured to send the local service data packet to the local expansion module, obtain a local feedback data packet sent by the local expansion module, and send the local feedback data packet to the first control unit;
the remote communication unit is used for sending the remote service data packet to the remote expansion module, acquiring a remote feedback data packet sent by the remote expansion module and sending the remote feedback data packet to the first control unit;
the first control unit is further configured to obtain a local feedback data packet sent by the local communication unit and a remote feedback data packet sent by the remote communication unit, and determine, according to the local feedback data packet and the remote feedback data packet, whether the local expansion module and each remote expansion module work normally.
8. A method for communication of a programmable logic controller, applied to a communication system of a programmable logic controller as claimed in any one of claims 1 to 7, the method comprising:
the remote communication module receives a remote service data packet sent by the programmable logic controller, sends the remote service data packet to a first-stage remote expansion module in at least two remote expansion modules corresponding to the remote communication module, and sets overtime waiting time according to preset time;
the remote communication module obtains remote return data packets of the remote expansion modules sent by the first-stage remote expansion module according to the timeout waiting time, generates remote feedback data packets, and sends the remote feedback data packets to the programmable logic controller; the programmable logic controller acquires a remote feedback data packet sent by the remote communication module and judges whether the remote feedback data packet contains a remote return data packet corresponding to each remote expansion module or not; if the remote feedback data packet contains a remote return data packet corresponding to each remote expansion module, the programmable logic controller determines that each remote expansion module corresponding to the remote communication module works normally; if the remote feedback data packet does not contain the remote return data packet corresponding to each remote expansion module, but contains error marking information, the programmable logic controller determines the corresponding remote expansion module according to the error marking information, and the corresponding remote expansion module is the remote expansion module with the fault.
9. The method of claim 8, wherein the remote communication module obtains remote return data packets of each remote expansion module sent by the first-stage remote expansion module according to a timeout waiting time, and generates a remote feedback data packet, including;
the remote communication module acquires remote return data packets of the remote expansion modules sent by the first-stage remote expansion module;
the remote communication module judges whether the overtime waiting time is reached;
if the timeout waiting time is reached, the remote communication module further judges whether the remote return data packet corresponding to each remote expansion module is acquired or not;
and if the remote communication module has acquired the remote return data packet corresponding to each remote expansion module, generating a remote feedback data packet according to the remote return data packet corresponding to each remote expansion module.
10. The method of claim 9, wherein after the remote communication module further determines whether the remote return packet corresponding to each remote expansion module has been acquired if the timeout waiting time has been reached, further comprising:
if the remote communication module does not acquire the remote return data packet corresponding to each remote extension module, checking the acquired remote return data packet, and determining the remote extension module corresponding to the remote return data packet which is not acquired;
Generating corresponding error mark information according to a remote expansion module corresponding to the unobtained remote return data packet;
and generating a remote feedback data packet according to the acquired remote feedback data packet and the error mark information.
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| CN116560348B (en) * | 2023-07-10 | 2023-11-03 | 钛玛科（北京）工业科技有限公司 | Controller deviation rectifying method based on wireless communication feedback |
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