CN108614491A - A kind of programmable logic controller (PLC) communication system and method - Google Patents
A kind of programmable logic controller (PLC) communication system and method Download PDFInfo
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- CN108614491A CN108614491A CN201810595672.XA CN201810595672A CN108614491A CN 108614491 A CN108614491 A CN 108614491A CN 201810595672 A CN201810595672 A CN 201810595672A CN 108614491 A CN108614491 A CN 108614491A
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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
- G05B2219/24—Pc safety
- 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
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The embodiment of the invention discloses a kind of programmable logic controller (PLC) communication system and methods.Wherein, which includes：Programmable logic controller (PLC), at least one remote communication module and at least two Remote Expansion modules corresponding with remote communication module, each Remote Expansion module are connected step by step in advance；Remote communication module receives the remote traffic data packet that programmable logic controller (PLC) is sent, remote traffic data packet is sent at least two Remote Expansion mould first order Remote Expansion modules in the block corresponding with remote communication module, and the long-range returned data packet of each Remote Expansion module is obtained according to the waiting-timeout time, distinct feed-back data packet is generated, and distinct feed-back data packet is sent to programmable logic controller (PLC).The technical solution of the embodiment of the present invention can judge whether each Remote Expansion module is working properly in time, position the Remote Expansion module of failure while increasing the input and output terminal of programmable logic controller (PLC) by Remote Expansion module.
Description
Technical field
The present embodiments relate to programmable logic controller (PLC) technologies more particularly to a kind of programmable logic controller (PLC) to communicate
System and method.
Background technology
With the development of industrial technology and the raising of the degree of automation, programmable logic controller (PLC) (Programmable
Logic Controller, PLC) application it is more and more.Programmable logic controller (PLC) is one kind exclusively in industrial settings
Using and design digital operation electronic system.It uses a kind of programmable memory, and storage inside it is executed and patrolled
The instruction for collecting the operations such as operation, sequential control, timing, counting and arithmetical operation, passes through digital or analog input and output
To control various types of mechanical equipments or production process.Programmable logic controller (PLC) is the core of Industry Control.For
Situ industrial occasion, each application scenario have to use one or more programmable logic controller (PLC).Some applications
Occasion, logic are not extremely complex, but the quantity for being needed input and output terminal is more, by increasing programmable logic control
The local expansion module of device processed cannot meet business need.
In the prior art, increase the input/output terminal of programmable logic controller (PLC) by increasing multiple Remote Expansion modules
Son.
Inventor in the implementation of the present invention, it is found that there are following defects for the prior art：Multiple Remote Expansion modules
It is communicated by shared bus, when having the wrong data for the Remote Expansion module for carrying out self-damage in bus, bus
It can paralyse, and programmable logic controller (PLC) cannot know the position of the Remote Expansion module to go wrong in time.
Invention content
A kind of programmable logic controller (PLC) communication system of present invention offer and method are increasing programmable logic control to realize
While the input and output terminal of device processed, the Remote Expansion module of positioning failure in time.
In a first aspect, an embodiment of the present invention provides a kind of programmable logic controller (PLC) communication systems, including：
Programmable logic controller (PLC), at least one remote communication module and at least two are corresponding with remote communication module remote
Journey expansion module, each Remote Expansion module are connected step by step in advance；
Wherein, programmable logic controller (PLC) for remote traffic data packet to be sent to remote communication module, and obtains remote
The distinct feed-back data packet that journey communication module is sent, judges whether each Remote Expansion module works just according to distinct feed-back data packet
Often；
Remote communication module, for receiving remote traffic data packet, by remote traffic data packet be sent at least two with
The corresponding Remote Expansion mould of remote communication module first order Remote Expansion module in the block, and obtain the according to the waiting-timeout time
The long-range returned data packet for each Remote Expansion module that level-one Remote Expansion module is sent generates distinct feed-back data packet, will be remote
Journey feedback data packet is sent to programmable logic controller (PLC)；
At least two Remote Expansion modules corresponding with remote communication module, for obtaining remote communication module or upper level
The remote traffic data packet that Remote Expansion module is sent, after extracting corresponding remote traffic data in remote traffic data packet,
Remote traffic data packet is sent to next stage Remote Expansion module, long-range return number is generated according to corresponding remote traffic data
According to packet, the long-range returned data packet that long-range returned data packet and next stage Remote Expansion module are sent is sent to telecommunication mould
Block or upper level Remote Expansion module.
Second aspect, the embodiment of the present invention additionally provide a kind of programmable logic controller (PLC) means of communication, including：
Remote communication module receives the remote traffic data packet that programmable logic controller (PLC) is sent, by remote traffic data packet
At least two Remote Expansion mould first order Remote Expansion modules in the block corresponding with remote communication module are sent to, and according to pre-
If the waiting-timeout time is arranged in the time；
Remote communication module obtains each Remote Expansion mould that first order Remote Expansion module is sent according to the waiting-timeout time
The long-range returned data packet of block generates distinct feed-back data packet, and distinct feed-back data packet is sent to Programmable logical controller
Device.
The technical solution of the embodiment of the present invention receives the long-range of programmable logic controller (PLC) transmission by remote communication module
It is in the block to be sent at least two Remote Expansion moulds corresponding with remote communication module by business data packet for remote traffic data packet
First order Remote Expansion module, and each Remote Expansion mould that first order Remote Expansion module is sent is obtained according to the waiting-timeout time
The long-range returned data packet of block generates distinct feed-back data packet, and distinct feed-back data packet is sent to Programmable logical controller
Device can be with so that programmable logic controller (PLC) judges whether each Remote Expansion module is working properly according to distinct feed-back data packet
While increasing the input and output terminal of programmable logic controller (PLC) by Remote Expansion module, each Remote Expansion is judged in time
Whether module is working properly, positions the Remote Expansion module of failure.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram for programmable logic controller (PLC) communication system that the embodiment of the present invention one provides；
Fig. 2 is a kind of structural schematic diagram of programmable logic controller (PLC) communication system provided by Embodiment 2 of the present invention；
Fig. 3 is a kind of structural schematic diagram for programmable logic controller (PLC) communication system that the embodiment of the present invention three provides；
Fig. 4 is a kind of structural schematic diagram for programmable logic controller (PLC) communication system that the embodiment of the present invention four provides；
Fig. 5 is a kind of flow chart for programmable logic controller (PLC) means of communication that the embodiment of the present invention five provides；
Fig. 6 is a kind of flow chart for programmable logic controller (PLC) means of communication that the embodiment of the present invention six provides.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of structural schematic diagram for programmable logic controller (PLC) communication system that the embodiment of the present invention one provides, this
Embodiment is applicable to the case where programmable logic controller (PLC) is communicated with Remote Expansion module, as shown in Figure 1, the system packet
It includes：
Programmable logic controller (PLC) 101, at least one remote communication module 102 and at least two and remote communication module
102 corresponding Remote Expansion modules 103, each Remote Expansion module 103 are connected step by step in advance.
Wherein, programmable logic controller (PLC) 101, for remote traffic data packet to be sent to remote communication module 102, and
The distinct feed-back data packet that remote communication module 102 is sent is obtained, each Remote Expansion module is judged according to distinct feed-back data packet
Whether 103 is working properly.
Remote traffic data packet is sent at least two by remote communication module 102 for receiving remote traffic data packet
First order Remote Expansion module in Remote Expansion module corresponding with remote communication module 102 103, and when according to waiting-timeout
Between obtain first order Remote Expansion module send each Remote Expansion module 103 long-range returned data packet, generate distinct feed-back
Distinct feed-back data packet is sent to programmable logic controller (PLC) 101 by data packet.
At least two Remote Expansion modules 103 corresponding with remote communication module, for obtain remote communication module 102 or
The remote traffic data packet that upper level Remote Expansion module is sent, extracts corresponding teleaction service number from remote traffic data packet
According to rear, remote traffic data packet is sent to next stage Remote Expansion module, is generated according to corresponding remote traffic data long-range
The long-range returned data packet that long-range returned data packet and next stage Remote Expansion module are sent is sent to remotely by returned data packet
Communication module 102 or upper level Remote Expansion module.
Wherein, remote traffic data packet is sent to remote communication module 102 by programmable logic controller (PLC) 101.Long-range industry
Include 103 corresponding remote traffic data of each Remote Expansion module in data packet of being engaged in, remote traffic data is used to indicate corresponding
Remote Expansion module 103 is completed to operate accordingly.After remote communication module 102 receives remote traffic data packet, by teleaction service
Data packet is sent to the first order Remote Expansion at least two Remote Expansion modules corresponding with remote communication module 102 103
Module, and the waiting-timeout time is arranged according to preset time.First order Remote Expansion module obtains remote communication module 102 and sends
Remote traffic data packet after, after extracting corresponding remote traffic data in remote traffic data packet, by remote traffic data
Packet is sent to next stage Remote Expansion module, and generates long-range returned data packet according to corresponding remote traffic data, will be long-range
Returned data packet is sent to remote communication module 102.Comprising corresponding Remote Expansion module 103 to remote in long-range returned data packet
Journey business datum is handled, after completing corresponding operation according to remote traffic data, the feedback data of generation.
After next stage Remote Expansion module obtains the remote traffic data packet that upper level Remote Expansion module is sent, from long-range
After extracting corresponding remote traffic data in business data packet, remote traffic data packet is sent to the next stage of itself and is remotely expanded
Module is opened up, and long-range returned data packet is generated according to corresponding remote traffic data, long-range returned data packet is sent to upper one
Grade Remote Expansion module.Wherein, if next stage Remote Expansion module is that afterbody corresponding with remote communication module 102 is remote
Remote traffic data packet is then no longer sent to the next stage Remote Expansion module of itself by journey expansion module.
The long-range returned data packet that next stage Remote Expansion module is sent is continued to be sent to by upper level Remote Expansion module
The upper level Remote Expansion module of itself, until long-range returned data packet is transferred to first order Remote Expansion module, then by the
Long-range returned data packet is sent to remote communication module 102 by level-one Remote Expansion module.Wherein, if upper level Remote Expansion
Module is first order Remote Expansion module, then is directly sent to long-range returned data packet far by first order Remote Expansion module
Journey communication module 102.
Remote communication module 102 obtains each Remote Expansion that first order Remote Expansion module is sent according to the waiting-timeout time
The long-range returned data packet of module 103 generates distinct feed-back data packet, and distinct feed-back data packet is sent to programmable logic
Controller 101.Programmable logic controller (PLC) 101 obtains the distinct feed-back data packet that remote communication module 102 is sent, according to long-range
Feedback data packet judges whether each Remote Expansion module 103 is working properly.
Specifically, remote communication module 102 obtains each Remote Expansion module 103 that first order Remote Expansion module is sent
Long-range returned data packet；Remote communication module 102 judges whether to reach the waiting-timeout time；If reaching the waiting-timeout time,
Then remote communication module 102 further determines whether to have obtained the corresponding long-range returned data of each Remote Expansion module 103
Packet；If remote communication module 102 has obtained the corresponding long-range returned data packet of each Remote Expansion module 103, basis
The corresponding long-range returned data packet of each Remote Expansion module 103 generates distinct feed-back data packet, and by distinct feed-back data
Packet is sent to programmable logic controller (PLC) 101；If it is right that each Remote Expansion module 103 has not been obtained in remote communication module 102
The long-range returned data packet answered then checks the long-range returned data packet obtained, determines the long-range returned data packet pair having not been obtained
The Remote Expansion module 103 answered；It is generated according to the corresponding Remote Expansion module of the long-range returned data packet having not been obtained 103 corresponding
Error flag information；Distinct feed-back data packet is generated according to the long-range returned data packet and error flag information obtained, and will
Distinct feed-back data packet is sent to programmable logic controller (PLC) 101.
Specifically, programmable logic controller (PLC) 101 obtains the distinct feed-back data packet that remote communication module 102 is sent, sentence
Whether include the corresponding long-range returned data packet of each Remote Expansion module 103 in disconnected distinct feed-back data packet, if remotely
It include the corresponding long-range returned data packet of each Remote Expansion module 103 in feedback data packet, it is determined that remote communication module
102 each corresponding Remote Expansion module 103 are working properly；If not including that each is long-range in distinct feed-back data packet
The corresponding long-range returned data packet of expansion module 103, but include error flag information, then according to the determination pair of error flag information
The Remote Expansion module answered.Corresponding Remote Expansion module is the Remote Expansion module to break down.
Programmable logic controller (PLC) 101 is a kind of electric exclusively for the digital operation designed is applied in industrial settings
Subsystem.It uses a kind of programmable memory, inside it storage execute logical operation, sequential control, timing, counting and
Remote traffic data packet is sent to long-range lead to by the instruction of the operations such as arithmetical operation by digital or analog input and output
Module 102 is interrogated, and obtains the distinct feed-back data packet of the transmission of remote communication module 102, is judged according to distinct feed-back data packet each
Whether Remote Expansion module 103 is working properly.
Optionally, programmable logic controller (PLC) 101 is connected with remote communication module 102 by bus.
Remote communication module 102 includes communication chip and micro-control unit (Microcontroller Unit, MCU).Far
Journey communication module 102 receives remote traffic data packet by communication chip, send remote traffic data packet at least two with it is remote
First order Remote Expansion module in 102 corresponding Remote Expansion module 103 of journey communication module obtains first order Remote Expansion mould
The long-range returned data packet for each Remote Expansion module 103 that block is sent.Remote communication module 102 is by MCU according to waiting-timeout
The long-range returned data packet of time and each Remote Expansion module 103 generate distinct feed-back data packet, then pass through communication chip again
Distinct feed-back data packet is sent to programmable logic controller (PLC) 101.
Optionally, the Remote Expansion module corresponding with remote communication module 102 of remote communication module 102 and at least two
First order Remote Expansion module in 103 is connected by two data lines.Two data lines are respectively used to digital independent sum number
According to write-in.Two data lines are attached using differential signal, to improve anti-interference ability.It is completed by two data lines long-range
First order Remote Expansion in corresponding with the remote communication module 102 Remote Expansion module of communication module 102 and at least two 103
Data input between module and data output.
Optionally, the Remote Expansion module corresponding with remote communication module 102 of remote communication module 102 and at least two
First order Remote Expansion module in 103 carries out communication transfer by full duplex mode.
At least two Remote Expansion modules 103 corresponding with remote communication module 102 include communication chip and MCU.Remotely
Expansion module 103 obtains the long-range industry that remote communication module 102 or upper level Remote Expansion module 103 are sent by communication chip
Business data packet.Remote Expansion module 103 after extracting corresponding remote traffic data in remote traffic data packet, is led to by MCU
It crosses communication chip and the remote traffic data packet comprising the remaining remote traffic data after extraction is sent to next stage Remote Expansion
Module, and obtain the long-range returned data packet of the transmission of next stage Remote Expansion module 103.Optionally, 103 profit of Remote Expansion module
It is extracted from remote traffic data packet with direct memory access (DMA) (Direct Memory Access, DMA) controller in MCU
Corresponding remote traffic data.Remote Expansion module 103 is handled remote traffic data by MCU, generates long-range return
After data packet, the long-range returned data packet that is sent long-range returned data packet and next stage Remote Expansion module by communication chip
It is sent to remote communication module 102 or upper level Remote Expansion module.
Optionally, upper level Remote Expansion module is connected with next stage Remote Expansion module by two data lines.Two
Data lines are respectively used to digital independent and data write-in.Two data lines are attached using differential signal, anti-dry to improve
Disturb ability.The data between upper level Remote Expansion module and next stage Remote Expansion module are completed by two data lines to input
It is exported with data.
Optionally, upper level Remote Expansion module carries out communication biography with next stage Remote Expansion module by full duplex mode
It is defeated.
A kind of programmable logic controller (PLC) communication system provided in this embodiment is received programmable by remote communication module
The remote traffic data packet that logic controller is sent, at least two and remote communication module pair are sent to by remote traffic data packet
The Remote Expansion mould first order Remote Expansion module in the block answered, and first order Remote Expansion mould is obtained according to the waiting-timeout time
The long-range returned data packet for each Remote Expansion module that block is sent generates distinct feed-back data packet, and by distinct feed-back data packet
It is sent to programmable logic controller (PLC), so that programmable logic controller (PLC) judges each Remote Expansion mould according to distinct feed-back data packet
Whether block is working properly, can increase the same of the input and output terminal of programmable logic controller (PLC) by Remote Expansion module
When, judge whether each Remote Expansion module is working properly in time, positions the Remote Expansion module of failure.
Embodiment two
Fig. 2 is a kind of structural schematic diagram of programmable logic controller (PLC) communication system provided by Embodiment 2 of the present invention, this
Embodiment on the basis of the above embodiments, optimizes remote communication module 102：As shown in Fig. 2, remote communication module
102 include the first communication unit 104, the second control unit 105 and the second communication unit 106；First communication unit 104, is used for
Remote traffic data packet is received, remote traffic data packet is sent to the second control unit 105；Second control unit 105, is used for
Remote traffic data packet is sent to the second communication unit 106；Second communication unit 106, for sending out remote traffic data packet
It send to first order Remote Expansion module, and obtains the long-range return of each Remote Expansion module of first order Remote Expansion module transmission
The long-range returned data packet of each Remote Expansion module is sent to the second control unit 105 by data packet；Second control unit 105,
It is additionally operable to the long-range returned data packet according to waiting-timeout time and each Remote Expansion module, generates distinct feed-back data packet, it will
Distinct feed-back data packet is sent to the first communication unit 104；First communication unit 104 is additionally operable to receive distinct feed-back data packet,
Distinct feed-back data packet is sent to programmable logic controller (PLC).
Wherein, after the first communication unit 104 receives remote traffic data, remote traffic data packet is sent to the second control
Unit 105.Remote traffic data packet is sent to the second communication unit 106 by the second control unit 105.Second communication unit 106
Remote traffic data packet is sent to first order Remote Expansion module, and obtains each long-range of first order Remote Expansion module transmission
The long-range returned data packet of each Remote Expansion module is sent to the second control unit by the long-range returned data packet of expansion module
105.Second control unit 105 generates long-range according to the long-range returned data packet of waiting-timeout time and each Remote Expansion module
Feedback data packet sends distinct feed-back data packet and is sent to the first communication unit 104.First communication unit 104 receives long-range anti-
After presenting data packet, distinct feed-back data packet is sent to programmable logic controller (PLC).
Specifically, the second control unit 105 obtains the long-range returned data packet of each Remote Expansion module, judge whether to reach
The waiting-timeout time.If reaching the waiting-timeout time, the second control unit 105 further determines whether to have obtained each
The corresponding long-range returned data packet of Remote Expansion module；If having obtained the corresponding long-range return number of each Remote Expansion module
According to packet, then distinct feed-back data packet is generated according to the corresponding long-range returned data packet of each Remote Expansion module；If do not obtained
The corresponding long-range returned data packet of each Remote Expansion module is taken, then checks the long-range returned data packet obtained, is determined not
The corresponding Remote Expansion module of long-range returned data packet obtained；According to the corresponding long-range expansion of long-range returned data packet having not been obtained
It opens up module and generates corresponding error flag information；It is generated according to the long-range returned data packet and error flag information obtained long-range
Feedback data packet.
Optionally, the first communication unit 104 includes communication chip, and the second control unit 105 includes MCU, and the second communication is single
Member 106 includes communication chip.
A kind of programmable logic controller (PLC) communication system provided in this embodiment receives long-range industry by the first communication unit
After data of being engaged in, remote traffic data packet is sent to first order Remote Expansion module by the second communication unit, and it is remote to obtain the first order
The long-range returned data packet for each Remote Expansion module that journey expansion module is sent, the second control unit according to the waiting-timeout time and
The long-range returned data packet of each Remote Expansion module, generates distinct feed-back data packet, and the first communication unit is by distinct feed-back data
Packet is sent to programmable logic controller (PLC), can complete programmable logic controller (PLC) and the data transmission of Remote Expansion module
Meanwhile feeding back the working condition of each Remote Expansion module to programmable logic controller (PLC) in time by distinct feed-back data packet.
Embodiment three
Fig. 3 is a kind of structural schematic diagram for programmable logic controller (PLC) communication system that the embodiment of the present invention three provides, this
Embodiment on the basis of the above embodiments, carries out at least two Remote Expansion modules corresponding with remote communication module excellent
Change：As shown in figure 3, at least two Remote Expansion modules corresponding with remote communication module include：First order Remote Expansion module
107 and second level Remote Expansion module 108, first order Remote Expansion module 107 and second level Remote Expansion module 108 connect step by step
It connects；First order Remote Expansion module 107 includes：Third communication unit 109, third control unit 110 and the 4th communication unit
111；Third communication unit 109, the remote traffic data packet for obtaining the transmission of remote communication module 102, by teleaction service number
It is sent to third control unit 110 according to packet；Third control unit 110, it is corresponding remote for being extracted from remote traffic data packet
After journey business datum, remote traffic data packet is sent to the 4th communication unit 111, is generated according to corresponding remote traffic data
First long-range returned data packet is sent to third communication unit 110 by the first long-range returned data packet；4th communication unit 111,
For remote traffic data packet to be sent to second level Remote Expansion module 108；Third communication unit 109 is additionally operable to first
Long-range returned data packet is sent to remote communication module 102；Second level Remote Expansion module 108 includes：5th communication unit 112
With the 4th control unit 113；5th communication unit 112, the remote traffic data for obtaining the transmission of the 4th communication unit 111
Packet, the 4th control unit 113 is sent to by remote traffic data packet；4th control unit 113 is used for from remote traffic data packet
After the corresponding remote traffic data of middle extraction, the second long-range returned data packet is generated according to corresponding remote traffic data, by the
Two long-range returned data packets are sent to the 5th communication unit 112；5th communication unit 112 is additionally operable to the second long-range return number
It is sent to the 4th communication unit 111 according to packet；4th communication unit 111 is additionally operable to the second long-range returned data packet being sent to
Three control units 110；Third control unit 110 is additionally operable to the second long-range returned data packet being sent to third communication unit
109；Third communication unit 109 is additionally operable to the second long-range returned data packet being sent to remote communication module 102.
It wherein, will be long-range after third communication unit 109 obtains the remote traffic data packet that remote communication module 102 is sent
Business data packet is sent to third control unit 110.Third control unit 110 is extracted corresponding remote from remote traffic data packet
After journey business datum, remote traffic data packet is sent to the 4th communication unit 111, and give birth to according to corresponding remote traffic data
At the first long-range returned data packet, the first long-range returned data packet is sent to third communication unit 110.4th communication unit
111 are sent to the remote traffic data packet that third control unit 110 is sent the 5th communication of second level Remote Expansion module 108
Unit 112.The first long-range returned data packet that third control unit 110 is sent is sent to long-range logical by third communication unit 109
Interrogate module 102.After 5th communication unit 112 obtains the remote traffic data packet that the 4th communication unit 111 is sent, by teleaction service
Data packet is sent to the 4th control unit 113.4th control unit 113 extracts corresponding long-range industry from remote traffic data packet
After data of being engaged in, the second long-range returned data packet is generated according to corresponding remote traffic data, the second long-range returned data packet is sent out
It send to the 5th communication unit 112.Second long-range returned data packet is sent to the 4th communication unit 111 by the 5th communication unit 112.
Second long-range returned data packet is sent to third control unit 110 by the 4th communication unit 111.Third control unit 110 is by
Two long-range returned data packets are sent to third communication unit 109.Third communication unit 109 sends the second long-range returned data packet
To remote communication module 102.Remote communication module 102 is remote according to waiting-timeout time, the first long-range returned data packet and second
Journey returned data packet generates distinct feed-back data packet, distinct feed-back data packet is sent to programmable logic controller (PLC) 101.
Optionally, third communication unit 109 includes communication chip, and third control unit 110 includes MCU, and the 4th communication is single
Member 111 includes communication chip, and the 5th communication unit 112 includes communication chip, and the 4th control unit 113 includes MCU.
Specifically, remote communication module 102 obtains the long-range returned data packet that first order Remote Expansion module 107 is sent.
Remote communication module 102 judges whether to reach the waiting-timeout time.If reaching waiting-timeout time, remote communication module
102 further determine whether to have obtained the corresponding long-range returned data packet of each Remote Expansion module：First long-range return number
According to packet and the second long-range returned data packet；If it is corresponding remote that remote communication module 102 has obtained each Remote Expansion module
Journey returned data packet then generates distinct feed-back data packet according to the first long-range returned data packet and the second long-range returned data packet,
And distinct feed-back data packet is sent to programmable logic controller (PLC) 101；If it is remote that each has not been obtained in remote communication module 102
The corresponding long-range returned data packet of journey expansion module then checks that the long-range returned data packet obtained, determination have not been obtained long-range
The corresponding Remote Expansion module of returned data packet；It is generated according to the corresponding Remote Expansion module of the long-range returned data packet having not been obtained
Corresponding error flag information；Distinct feed-back data are generated according to the long-range returned data packet and error flag information obtained
Packet, and distinct feed-back data packet is sent to programmable logic controller (PLC) 101.
For example, the corresponding long-range returned data packet of each Remote Expansion module has not been obtained in remote communication module 102, check
The the first long-range returned data packet obtained determines and the second long-range returned data packet has not been obtained, and determines that have not been obtained second is long-range
The corresponding two level Remote Expansion module 108 of returned data packet, then generate corresponding mistake according to second level Remote Expansion module 108
Label information, and marked according to the obtained first long-range returned data packet and 108 corresponding mistake of second level Remote Expansion module
Remember that information generates distinct feed-back data packet, distinct feed-back data packet is then sent to programmable logic controller (PLC) 101.It is programmable
Logic controller 101 obtains the distinct feed-back data packet that remote communication module 102 is sent, according to the in distinct feed-back data packet
108 corresponding error flag information of two level Remote Expansion module determines that second level Remote Expansion module 108 is the remote of failure
Journey expansion module.
A kind of programmable logic controller (PLC) communication system provided in this embodiment, by by first order Remote Expansion module and
Second level Remote Expansion module connects step by step, remote communication module according to the waiting-timeout time, the first long-range returned data packet and
Second long-range returned data packet generates distinct feed-back data packet, distinct feed-back data packet is sent to programmable logic controller (PLC),
It can be defeated in the input for increasing programmable logic controller (PLC) by first order Remote Expansion module and second level Remote Expansion module
While going out terminal, judge whether first order Remote Expansion module and second level Remote Expansion module are working properly in time, positions
The Remote Expansion module of failure.
Example IV
Fig. 4 is a kind of structural schematic diagram for programmable logic controller (PLC) communication system that the embodiment of the present invention four provides, this
Embodiment on the basis of the above embodiments, optimizes programmable logic controller (PLC) communication system：As shown in figure 4, this can
Programmed logic controller communication system further includes at least one local expansion module 114；At least one local expansion module 114,
It is connected with programmable logic controller (PLC) 101, the corresponding local service data for obtaining the transmission of programmable logic controller (PLC) 101
Packet, local feedback data packet is generated according to corresponding local service data packet, and local feedback data packet is sent to programmable patrol
Collect controller 101.
Programmable logic controller (PLC) 101 is optimized：As shown in figure 4, programmable logic controller (PLC) 101 includes the first control
Unit 115, local communication unit 116 and remote communication unit 117 processed；First control unit 115, for generating local service number
According to packet and remote traffic data packet, and local service data packet is sent to local communication unit 116, by remote traffic data packet
It is sent to remote communication unit 117；Local communication unit 116, for local service data packet to be sent to local expansion module
114, and the local feedback data packet of the transmission of local expansion module 114 is obtained, local feedback data packet is sent to the first control
Unit 115；Remote communication unit 117 for remote traffic data packet to be sent to remote communication module 102, and obtains long-range
The distinct feed-back data packet that communication module 102 is sent, the first control unit 115 is sent to by distinct feed-back data packet；First control
Unit 115 processed is additionally operable to obtain the local feedback data packet and the hair of remote communication unit 117 that local communication unit 116 is sent
The distinct feed-back data packet sent judges local expansion module 114 respectively according to local feedback data packet and distinct feed-back data packet
And whether each Remote Expansion module 103 is working properly.
Wherein, the first control unit 115 generates local service data packet and remote traffic data packet, and by local service number
It is sent to local communication unit 116 according to packet, remote traffic data packet is sent to remote communication unit 117.Local communication unit
Local service data packet is sent to local expansion module 114 by 116, and obtains the local feedback of the transmission of local expansion module 114
Local feedback data packet is sent to the first control unit 115 by data packet.Remote communication unit 117 is by remote traffic data packet
It is sent to remote communication module 102, and obtains the distinct feed-back data packet of the transmission of remote communication module 102, by distinct feed-back number
It is sent to the first control unit 115 according to packet.First control unit 115 obtains the local feedback coefficient that local communication unit 116 is sent
According to the distinct feed-back data packet that packet and remote communication unit 117 are sent, according to local feedback data packet and distinct feed-back data
Packet judges whether local expansion module 114 and each Remote Expansion module 103 are working properly respectively.
Local expansion module 114 includes communication chip and MCU.Local expansion module 114 is obtained local by communication chip
The local service data packet that communication unit 116 is sent.Include 114 corresponding local of local expansion module in local service data packet
Business datum.Local service data are used to indicate corresponding local expansion module 114 and complete to operate accordingly.Local expansion module
114 by MCU after extracting corresponding local service data in local service data packet, local service data are handled,
After generating local returned data packet, local returned data packet is sent to by local communication unit 116 by communication chip.
Optionally, local expansion module 114 is connected with local communication unit 116 by bus.
First control unit 115 obtains local feedback data packet, judges local expansion module according to local feedback data packet
Whether 114 is working properly.It is right comprising corresponding local expansion module 114 in local feedback data packet
Local service data are handled, after completing corresponding operation according to local service data, the feedback data of generation.
Remote communication module 102 obtains the long-range returned data packet of each Remote Expansion module 103 according to the waiting-timeout time,
Distinct feed-back data packet is generated, and distinct feed-back data packet is sent to remote communication unit 117.First control unit 115 obtains
Distinct feed-back data packet is taken, judges whether each Remote Expansion module 103 is working properly according to distinct feed-back data packet.
A kind of programmable logic controller (PLC) communication system provided in this embodiment is obtained local logical by the first control unit
The local feedback data packet that unit is sent and the distinct feed-back data packet that remote communication unit is sent are interrogated, according to local feedback
Data packet and distinct feed-back data packet judge whether local expansion module and each Remote Expansion module are working properly respectively, can be with
While increasing the input and output terminal of programmable logic controller (PLC) by local expansion module and Remote Expansion module, in time
Judge whether local expansion module and Remote Expansion module are working properly, position the Remote Expansion module of failure.
Embodiment five
Fig. 5 is a kind of flow chart for programmable logic controller (PLC) means of communication that the embodiment of the present invention five provides, this implementation
Example is applicable to the case where programmable logic controller (PLC) is communicated with Remote Expansion module, and this method can be applied to such as this hair
In the programmable logic controller (PLC) communication system that bright above-described embodiment provides.With reference to figure 5, specifically comprise the following steps：
Step 501, remote communication module receive the remote traffic data packet that programmable logic controller (PLC) is sent, by long-range industry
Business data packet is sent at least two Remote Expansion mould first order Remote Expansion modules in the block corresponding with remote communication module,
And the waiting-timeout time is arranged according to preset time.
Wherein, remote traffic data packet is sent to remote communication module by programmable logic controller (PLC).Remote traffic data
Include the corresponding remote traffic data of each Remote Expansion module in packet, remote traffic data is used to indicate corresponding Remote Expansion mould
Block completes corresponding operation.After remote communication module receives remote traffic data packet, remote traffic data packet is sent at least
Two Remote Expansion mould first order Remote Expansion modules in the block corresponding with remote communication module, and be arranged according to preset time
The waiting-timeout time.
Preset time is the time being arranged according to business demand.According to preset time, the waiting-timeout time is set.For example, pre-
If the time is 3 minutes, the setting waiting-timeout time is 3 minutes.The waiting-timeout time is that the remote communication module acquisition first order is remote
The waiting time of the long-range returned data packet for each Remote Expansion module that journey expansion module is sent.The waiting-timeout time is not reached
When, remote communication module persistently obtains the long-range returned data of each Remote Expansion module of first order Remote Expansion module transmission
Packet；When reaching the waiting-timeout time, remote communication module further determines whether to have obtained each Remote Expansion module pair
The long-range returned data packet answered.
Step 502, remote communication module obtain each remote of first order Remote Expansion module transmission according to the waiting-timeout time
The long-range returned data packet of journey expansion module generates distinct feed-back data packet, and distinct feed-back data packet is sent to programmable
Logic controller.
Wherein, remote communication module obtains the long-range return for each Remote Expansion module that first order Remote Expansion module is sent
Data packet.Remote communication module judges whether to reach the waiting-timeout time.If reaching waiting-timeout time, telecommunication mould
Block further determines whether to have obtained the corresponding long-range returned data packet of each Remote Expansion module.If remote communication module
Obtained the corresponding long-range returned data packet of each Remote Expansion module, then it is corresponding remote according to each Remote Expansion module
Journey returned data packet generates distinct feed-back data packet, and distinct feed-back data packet is sent to programmable logic controller (PLC)；If
The corresponding long-range returned data packet of each Remote Expansion module has not been obtained in remote communication module, then checks that is obtained remotely returns
Data packet is returned, determines the corresponding Remote Expansion module of long-range returned data packet having not been obtained；According to the long-range return number having not been obtained
Corresponding error flag information is generated according to corresponding Remote Expansion module is wrapped；According to the long-range returned data packet and mistake obtained
Label information generates distinct feed-back data packet, and distinct feed-back data packet is sent to programmable logic controller (PLC).
Programmable logic controller (PLC) obtains the distinct feed-back data packet that remote communication module is sent, and judges distinct feed-back data
Whether include the corresponding long-range returned data packet of each Remote Expansion module in packet, if comprising every in distinct feed-back data packet
The corresponding long-range returned data packet of one Remote Expansion module, it is determined that each corresponding Remote Expansion mould of remote communication module
Block is all working properly；If in distinct feed-back data packet not including the corresponding long-range returned data of each Remote Expansion module
Packet, but include error flag information, then corresponding Remote Expansion module is determined according to error flag information.Corresponding long-range expansion
It is the Remote Expansion module to break down to open up module.
A kind of programmable logic controller (PLC) means of communication provided in this embodiment, by remote communication module by teleaction service
Data packet is sent at least two Remote Expansion mould first order Remote Expansion modules in the block corresponding with remote communication module, and
The long-range returned data packet of each Remote Expansion module is obtained according to the waiting-timeout time, generates distinct feed-back data packet, and will be remote
Journey feedback data packet is sent to programmable logic controller (PLC), so that programmable logic controller (PLC) judges according to distinct feed-back data packet
Whether each Remote Expansion module is working properly, can be in the data transmission for completing programmable logic controller (PLC) and Remote Expansion module
While, feed back the working condition of each Remote Expansion module to programmable logic controller (PLC) in time by distinct feed-back data packet.
Embodiment six
Fig. 6 is a kind of flow chart for programmable logic controller (PLC) means of communication that the embodiment of the present invention six provides, this implementation
Example on the basis of the above embodiments, optimizes step 502：Remote communication module obtains first according to the waiting-timeout time
The long-range returned data packet for each Remote Expansion module that grade Remote Expansion module is sent generates distinct feed-back data packet, including；Far
Journey communication module obtains the long-range returned data packet for each Remote Expansion module that first order Remote Expansion module is sent；Telecommunication
Module judges whether to reach the waiting-timeout time；If reaching the waiting-timeout time, further judgement is remote communication module
It is no to have obtained the corresponding long-range returned data packet of each Remote Expansion module；If it is remote that remote communication module has obtained each
The corresponding long-range returned data packet of journey expansion module, then according to the corresponding long-range returned data Bao Sheng of each Remote Expansion module
At distinct feed-back data packet.
As shown in fig. 6, this method includes：
Step 601, remote communication module receive the remote traffic data packet that programmable logic controller (PLC) is sent, by long-range industry
Business data packet is sent at least two Remote Expansion mould first order Remote Expansion modules in the block corresponding with remote communication module,
And the waiting-timeout time is arranged according to preset time.
Step 602, remote communication module obtain the long-range of each Remote Expansion module that first order Remote Expansion module is sent
Returned data packet.
Wherein, remote communication module obtains each Remote Expansion mould that first order Remote Expansion module is sent by communication chip
The long-range returned data packet of block.Remote communication module and at least two Remote Expansion moulds corresponding with remote communication module are in the block
First order Remote Expansion module is connected by two data lines.Two data lines include：Data read line and data write line.Two
Data line is attached using differential signal, improves anti-interference ability.
Step 603, remote communication module judge whether to reach the waiting-timeout time.
Wherein, remote communication module is corresponding with remote communication module from remote traffic data packet is sent at least two
The waiting-timeout time is set after Remote Expansion mould first order Remote Expansion module in the block, is obtaining first order Remote Expansion module
During the long-range returned data packet of each Remote Expansion module sent, judged whether to reach waiting-timeout according to current time
Time.
If step 604 reaches the waiting-timeout time, remote communication module further determines whether to have obtained each
The corresponding long-range returned data packet of Remote Expansion module.
Wherein, if reaching the waiting-timeout time, remote communication module further determines whether to have obtained each far
The corresponding long-range returned data packet of journey expansion module.Optionally, remote communication module is according to the long-range returned data packet obtained
Quantity judge whether to have obtained the corresponding long-range returned data packet of each Remote Expansion module.Remote communication module judges
Obtain long-range returned data packet quantity whether the quantity one with whole Remote Expansion modules corresponding to remote communication module
It causes.If the number of the quantity of the long-range returned data packet obtained and whole Remote Expansion modules corresponding to remote communication module
Amount is consistent, it is determined that remote communication module has obtained the corresponding long-range returned data packet of each Remote Expansion module；If
The quantity of the long-range returned data packet obtained and the quantity of whole Remote Expansion modules corresponding to remote communication module are inconsistent,
Then show the long-range returned data packet for having missing, it is corresponding remote to determine that each Remote Expansion module has not been obtained in remote communication module
Journey returned data packet.
If not reaching the waiting-timeout time, remote communication module persistently obtains the transmission of first order Remote Expansion module
The long-range returned data packet of each Remote Expansion module.
If step 605, remote communication module have obtained the corresponding long-range returned data packet of each Remote Expansion module,
Distinct feed-back data packet is then generated according to the corresponding long-range returned data packet of each Remote Expansion module, and by distinct feed-back number
It is sent to programmable logic controller (PLC) according to packet.
It wherein, will if remote communication module has obtained the corresponding long-range returned data packet of each Remote Expansion module
Acquired all long-range returned data packet is packaged, and generates distinct feed-back data packet, and distinct feed-back data packet is sent to can
Programmed logic controller.Programmable logic controller (PLC) obtains the distinct feed-back data packet that remote communication module is sent, and judges long-range
Whether comprising after the corresponding long-range returned data packet of each Remote Expansion module in feedback data packet, distinct feed-back data are determined
Include the corresponding long-range returned data packet of each Remote Expansion module in packet, determining remote communication module, corresponding each is remote
Journey expansion module is all working properly.
Optionally, if reaching the waiting-timeout time, remote communication module further determines whether to have obtained each
After the corresponding long-range returned data packet of a Remote Expansion module, further include：If it is remote that each has not been obtained in remote communication module
The corresponding long-range returned data packet of journey expansion module then checks that the long-range returned data packet obtained, determination have not been obtained long-range
The corresponding Remote Expansion module of returned data packet；It is generated according to the corresponding Remote Expansion module of the long-range returned data packet having not been obtained
Corresponding error flag information；Distinct feed-back data are generated according to the long-range returned data packet and error flag information obtained
Packet.
Wherein, if the corresponding long-range returned data packet of each Remote Expansion module has not been obtained in remote communication module,
By checking the long-range returned data packet obtained, determines the long-range returned data packet having not been obtained, determine that is had not been obtained remotely returns
Return the corresponding Remote Expansion module of data packet.Then according to the corresponding Remote Expansion module life of the long-range returned data packet having not been obtained
At corresponding error flag information.Error flag information is used to indicate corresponding Remote Expansion module and breaks down, and does not return remote
Journey returned data packet.The long-range returned data packet and error flag information package that will have been obtained generate distinct feed-back data packet, hair
It send to programmable logic controller (PLC).Programmable logic controller (PLC) obtains the distinct feed-back data packet that remote communication module is sent, and
Judge whether long-range comprising after the corresponding long-range returned data packet of each Remote Expansion module, determining in distinct feed-back data packet
Do not include the corresponding long-range returned data packet of each Remote Expansion module in feedback data packet, but includes error flag letter
Breath then determines that corresponding Remote Expansion module is the Remote Expansion module to break down according to error flag information.
A kind of programmable logic controller (PLC) means of communication provided in this embodiment, it is each remote in acquisition by remote communication module
During the long-range returned data packet of journey expansion module, judge whether to reach the waiting-timeout time；If reaching waiting-timeout
Time then further determines whether to have obtained the corresponding long-range returned data packet of each Remote Expansion module；If obtained
The corresponding long-range returned data packet of each Remote Expansion module then generates distinct feed-back according to the long-range returned data packet of acquisition
Data packet can pass through distinct feed-back while completing programmable logic controller (PLC) and the data transmission of Remote Expansion module
Data packet feeds back whether each Remote Expansion module sends long-range returned data packet in time to programmable logic controller (PLC), so as to can compile
Journey logic controller determines the working condition of each Remote Expansion module.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
May include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of programmable logic controller (PLC) communication system, which is characterized in that including：
Programmable logic controller (PLC), at least one remote communication module and at least two are corresponding with the remote communication module remote
Journey expansion module, each Remote Expansion module are connected step by step in advance；
Wherein, the programmable logic controller (PLC) for remote traffic data packet to be sent to the remote communication module, and obtains
The distinct feed-back data packet for taking the remote communication module to send, judges each long-range expansion according to the distinct feed-back data packet
Whether working properly open up module；
The remote traffic data packet is sent to institute by the remote communication module for receiving the remote traffic data packet
At least two Remote Expansion mould first order Remote Expansion modules in the block corresponding with the remote communication module are stated, and according to super
When the stand-by period obtain the long-range returned data packet of each Remote Expansion module that the first order Remote Expansion module is sent,
Distinct feed-back data packet is generated, the distinct feed-back data packet is sent to the programmable logic controller (PLC)；
Described at least two Remote Expansion modules corresponding with the remote communication module, for obtaining the remote communication module
Or the remote traffic data packet that upper level Remote Expansion module is sent, it is extracted from the remote traffic data packet corresponding long-range
After business datum, the remote traffic data packet is sent to next stage Remote Expansion module, according to the corresponding long-range industry
Data of being engaged in generate long-range returned data packet, the long-range returned data packet and the next stage Remote Expansion module are sent remote
Journey returned data packet is sent to the remote communication module or upper level Remote Expansion module.
2. system according to claim 1, which is characterized in that the remote communication module includes the first communication unit, the
Two control units and the second communication unit；
The remote traffic data packet is sent to institute by first communication unit for receiving the remote traffic data packet
State the second control unit；
Second control unit, for the remote traffic data packet to be sent to second communication unit；
Second communication unit, for the remote traffic data packet to be sent to the first order Remote Expansion module, and
The long-range returned data packet for obtaining each Remote Expansion module that the first order Remote Expansion module is sent, by each institute
The long-range returned data packet for stating Remote Expansion module is sent to second control unit；
Second control unit is additionally operable to the long-range return according to waiting-timeout time and each Remote Expansion module
Data packet generates distinct feed-back data packet, the distinct feed-back data packet is sent to first communication unit；
First communication unit is additionally operable to receive the distinct feed-back data packet, sends the distinct feed-back data packet to institute
State programmable logic controller (PLC).
3. system according to claim 1, which is characterized in that described at least two is corresponding with the remote communication module
Remote Expansion module includes：First order Remote Expansion module and second level Remote Expansion module, the first order Remote Expansion mould
Block and second level Remote Expansion module connect step by step.
4. system according to claim 3, which is characterized in that the first order Remote Expansion module includes：Third communicates
Unit, third control unit and the 4th communication unit；
The third communication unit, the remote traffic data packet sent for obtaining the remote communication module will be described long-range
Business data packet is sent to the third control unit；
The third control unit, for after extracting corresponding remote traffic data in the remote traffic data packet, by institute
It states remote traffic data packet and is sent to the 4th communication unit, it is long-range to generate first according to the corresponding remote traffic data
First long-range returned data packet is sent to the third communication unit by returned data packet；
4th communication unit, for the remote traffic data packet to be sent to the second level Remote Expansion module；
The third communication unit is additionally operable to the described first long-range returned data packet being sent to the remote communication module.
5. system according to claim 4, which is characterized in that the second level Remote Expansion module includes：5th communication
Unit and the 4th control unit；
5th communication unit, the remote traffic data packet sent for obtaining the 4th communication unit will be described
Remote traffic data packet is sent to the 4th control unit；
4th control unit, for after extracting corresponding remote traffic data in the remote traffic data packet, according to
The corresponding remote traffic data generates the second long-range returned data packet, and the described second long-range returned data packet is sent to institute
State the 5th communication unit；
5th communication unit is additionally operable to the described second long-range returned data packet being sent to the 4th communication unit；
4th communication unit is additionally operable to the described second long-range returned data packet being sent to the third control unit；
The third control unit is additionally operable to the described second long-range returned data packet being sent to the third communication unit；
The third communication unit is additionally operable to the described second long-range returned data packet being sent to the remote communication module.
6. system according to claim 1, which is characterized in that further include at least one local expansion module；
At least one local expansion module, is connected with the programmable logic controller (PLC), is patrolled for obtaining described may be programmed
The corresponding local service data packet that controller is sent is collected, local feedback coefficient is generated according to the corresponding local service data packet
According to packet, the local feedback data packet is sent to the programmable logic controller (PLC).
7. system according to claim 6, which is characterized in that the programmable logic controller (PLC) includes that the first control is single
Member, local communication unit and remote communication unit；
First control unit, for generating local service data packet and remote traffic data packet, and by the local service
Data packet is sent to the local communication unit, and the remote traffic data packet is sent to the remote communication unit；
The local communication unit for the local service data packet to be sent to the local expansion module, and obtains institute
The local feedback data packet that local expansion module is sent is stated, it is single that the local feedback data packet is sent to first control
Member；
The remote communication unit for the remote traffic data packet to be sent to the Remote Expansion module, and obtains institute
It is single to be sent to first control by the distinct feed-back data packet for stating the transmission of Remote Expansion module for the distinct feed-back data packet
Member；
First control unit is additionally operable to obtain local feedback data packet that the local communication unit is sent and described
The distinct feed-back data packet that remote communication unit is sent, according to the local feedback data packet and the distinct feed-back data packet point
Do not judge whether the local expansion module and each Remote Expansion module are working properly.
8. a kind of programmable logic controller (PLC) means of communication, can compile applied to one kind as described in any one of claim 1-7
In journey logic controller communication system, which is characterized in that the method includes：
Remote communication module receives the remote traffic data packet that programmable logic controller (PLC) is sent, by the remote traffic data packet
It is sent at least two Remote Expansion mould first order Remote Expansion modules in the block corresponding with the remote communication module, and root
According to preset time, the waiting-timeout time is set；
The remote communication module obtains each described remote of the first order Remote Expansion module transmission according to the waiting-timeout time
The long-range returned data packet of journey expansion module generates distinct feed-back data packet, and the distinct feed-back data packet is sent to institute
State programmable logic controller (PLC).
9. according to the method described in claim 8, it is characterized in that, the remote communication module is obtained according to the waiting-timeout time
The long-range returned data packet for each Remote Expansion module that the first order Remote Expansion module is sent generates distinct feed-back number
According to packet, including；
Remote communication module obtains the long-range return for each Remote Expansion module that the first order Remote Expansion module is sent
Data packet；
Remote communication module judges whether to reach the waiting-timeout time；
If reaching the waiting-timeout time, remote communication module further determines whether to have obtained each Remote Expansion module
Corresponding long-range returned data packet；
If remote communication module has obtained the corresponding long-range returned data packet of each Remote Expansion module, according to each
The corresponding long-range returned data packet of Remote Expansion module generates distinct feed-back data packet.
10. if according to the method described in claim 9, it is characterized in that, reaching waiting-timeout time, telecommunication mould
Block further determines whether after having obtained the corresponding long-range returned data packet of each Remote Expansion module, further includes：
If the corresponding long-range returned data packet of each Remote Expansion module has not been obtained in remote communication module, checks and obtained
Long-range returned data packet, determine the corresponding Remote Expansion module of long-range returned data packet that has not been obtained；
Corresponding error flag information is generated according to the corresponding Remote Expansion module of the long-range returned data packet having not been obtained；
Distinct feed-back data packet is generated according to the long-range returned data packet obtained and the error flag information.
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