CN212163360U - DCS double-path non-switching same-duplex modbus communication system - Google Patents
DCS double-path non-switching same-duplex modbus communication system Download PDFInfo
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- CN212163360U CN212163360U CN202020443364.8U CN202020443364U CN212163360U CN 212163360 U CN212163360 U CN 212163360U CN 202020443364 U CN202020443364 U CN 202020443364U CN 212163360 U CN212163360 U CN 212163360U
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Abstract
The utility model belongs to the technical field of distributed control system DCS, in particular to a DCS double-path non-switching same-duplex modbus communication system, which comprises a DCS system and a third-party system communication structure, wherein system hardware equipment comprises two DCS platform non-redundant communication clamping pieces, two PLC platform Ehternet/IP communication clamping pieces, two Ethernet switches and a PLC side table master-slave rack; the utility model discloses avoided because of DCS side communication fastener trouble, drive lose, switch trouble and communication medium damage and cause the accident that the communication was interrupted completely, guaranteed the production line safety and stability operation of mill. Meanwhile, due to the characteristics of high reliability and strong fault tolerance of the communication mode, the factory popularizes the communication mode of two-way non-switching and same-duplex communication to the communication between other third-party systems and the DCS, thereby greatly benefiting the economic benefit.
Description
Technical Field
The utility model belongs to the technical field of distributed control system DCS, concretely relates to DCS double-circuit does not have switching with duplex modbus communication system.
Background
At present, a DCS and a third-party control system in the industrial control field are mainly communicated in real time through a communication card supporting a modbus protocol, and the communication mode comprises a non-redundant single-path communication mode and a redundant two-path communication mode.
The non-redundant single-channel communication mode carries out single-link real-time communication with a third-party system communication card through the DCS non-redundant communication card, and the risks of complete communication interruption caused by card faults, drive loss and communication medium damage generally exist.
The redundant communication mode realizes redundant communication with a third-party system through the DCS redundant communication card, the redundant communication is not real-time redundant communication, and the standby communication card can be switched only when the main redundant communication fails, so that the possibility of switching failure exists; meanwhile, in the industrial control field, the condition that the whole drive of the redundant communication card is lost for many times to cause the simultaneous and complete interruption of the two-way communication is caused, so that great economic and property loss is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at above-mentioned drawback, provide a DCS double-circuit does not have switching with duplex modbus communication system, realized that data passes through the subchannel and receives simultaneously and send, when single or even many faults appear in the communication link, can cut the validity of guaranteeing the communication and establishing data transmission in fact.
The technical scheme of the utility model as follows:
a DCS double-path non-switching same-duplex modbus communication system is provided, wherein a communication structure of a DCS system and a third-party system is provided, and system hardware equipment comprises two DCS platform non-redundant communication clamping pieces, two PLC platform Ehternet/IP communication clamping pieces, two Ethernet switches and a PLC side table master-slave rack;
connecting a DCS side non-redundant communication card and a third-party system one-way communication card to the same Ethernet switch by using a TCP/IP network communication protocol through a network cable, and simultaneously configuring the other way of communication in a redundant manner, thereby realizing two-way one-to-one real-time communication on hardware;
a redundant PLC controller and a corresponding redundant conversion module are arranged at the side of a PLC controller of a third-party system, so that the main PLC controller can be switched to a standby controller when the main PLC controller fails;
two PLC platforms Ehternet/IP communication cards of a third-party system are connected through an Ethernet switch, and meanwhile, the two Ethernet switches are connected through a network cable for communication interconnection, so that the automatic exchange of IP addresses of a master PLC and a slave PLC can be realized when the master PLC performs master-slave conversion;
two non-redundant communication cards of the DCS are provided with the same target IP address, namely the address of the main PLC communication card of the third-party system, and the main PLC communication card can simultaneously receive and send communication data from two controllers at the DCS side through the Ethernet switch.
A PLC communication card piece is connected with a DCS non-redundant communication card piece one to one, constitutes double-path one to one communication mode altogether, and then sets up two way same-duplex data transmission channels, and two way channels carry out data receiving and sending simultaneously.
And the master-slave rack on the third-party system side is designed into a complete redundant structure, so that two paths of data are transmitted in real time in the third-party system.
In a third-party system, the IP addresses are automatically exchanged when the PLC controller performs master-slave switching through the redundancy module, and then the same target IP address is configured for the DCS communication card.
The DCS side non-redundant communication card only sets a unique target IP address.
The beneficial effects of the utility model reside in that:
utilize the utility model discloses technical scheme has avoided losing, switch trouble and communication medium damage and cause the accident that the communication was interrupted completely because of DCS side communication fastener trouble, drive, has guaranteed the production line safety and stability operation of mill. Meanwhile, due to the characteristics of high reliability and strong fault tolerance of the communication mode, the factory popularizes the communication mode of two-way non-switching and same-duplex communication to the communication between other third-party systems and the DCS, thereby greatly benefiting the economic benefit.
The utility model discloses an innovative proposition the special redundant working method of industrial communication system, this mode promotes the reliability of third party system to DCS communication by a wide margin, has very big economic value, has to show help to the level that promotes the operation of large-scale mill safety and stability, and the design and the realization of communication mode also carry out the reliability for the system of follow-up industrial control field industry ethernet communication technology and promote and provide good reference blue book.
Drawings
Fig. 1 is a schematic view of the communication structure between the DCS system and the third party system of the present invention;
fig. 2 is a principal and subordinate IP exchange schematic diagram of the PLC communication card of the present invention;
FIG. 3 is a schematic diagram of the IIN/BIN/IOUT/BOUT redundant communication implementation of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, a DCS double-path non-switching same-duplex modbus communication system has a communication structure of a DCS system and a third-party system, and system hardware equipment comprises two DCS platform non-redundant communication clamping pieces, two PLC platform Ehternet/IP communication clamping pieces, two Ethernet switches and a PLC side table master-slave rack.
Connecting a DCS side non-redundant communication card and a third-party system one-way communication card to the same Ethernet switch by using a TCP/IP network communication protocol through a network cable, and simultaneously configuring the other way of communication in a redundant manner, thereby realizing two-way one-to-one real-time communication on hardware; a redundant PLC controller and a corresponding redundant conversion module are arranged at the side of a PLC controller of a third-party system, so that the main PLC controller can be switched to a standby controller when the main PLC controller fails; two PLC platforms Ehternet/IP communication cards of a third-party system are connected through an Ethernet switch, and meanwhile, the two Ethernet switches are connected through a network cable for communication interconnection, so that the automatic exchange of IP addresses of a master PLC and a slave PLC can be realized when the master PLC performs master-slave conversion; two non-redundant communication cards of the DCS are provided with the same target IP address, namely the address of the main PLC communication card of the third-party system, and the main PLC communication card can simultaneously receive and send communication data from two controllers at the DCS side through the Ethernet switch.
One PLC communication card is connected with one DCS non-redundant communication card in a one-to-one mode to form a two-way one-to-one communication mode, and then two same-duplex data transmission channels are set up and are used for receiving and sending data simultaneously;
the master-slave rack on the third-party system side is designed into a complete redundancy structure, so that two paths of data are transmitted in real time in a data signal in the third-party system, and when one path of data fails, the data transmission is not influenced;
in a third-party system, the IP addresses are automatically exchanged when the PLC controller performs master-slave switching through the redundancy module, and then two communication cards access the communication card of the master PLC at the same time by configuring the same target IP address for the DCS communication card;
with the communication of third party's system redundant communication fastener, DCS side non-redundant communication fastener only sets up only unique target IP address, main PLC promptly, need not to pay attention to standby PLC's IP address, abandons two main and standby communication fasteners and sets up the traditional design theory of two different target IPs.
The two-way one-to-one structure eliminates the risk of failure of the traditional redundant communication main-standby switching, avoids data loss caused by the main-standby switching, and simultaneously eliminates the hidden trouble of complete communication interruption caused by single fault phenomena such as communication card damage, communication medium damage and the like; because the same IP address is configured on the third-party system side, communication confusion is not easy to occur, and simultaneously, the design concept that two paths of data communication are still carried out in the third-party system in real time when one communication card on the DCS side fails is realized, and the communication reliability is improved.
Respectively compiling drive configuration file codes for the two DCS non-redundant communication cards, configuring independent and different IP addresses, and carrying out independent drive installation, so that the communication drives of the two DCS non-redundant communication cards are completely independent and do not influence each other and work simultaneously;
the corresponding redundant data type, namely the same module has two-way input or output at the same time, realizes the real-time same-duplex input/output of two-way data, realizes the redundant selection of data through software, and completes the communication realization of the real integer/digital data type.
The two non-redundant communication card pieces are provided with mutually independent drives, so that when the communication drive of one of the non-redundant card pieces is lost, the other communication card piece can be kept in a normal working state without being influenced; meanwhile, the traditional repetitive data redundancy mode is replaced by using the redundant data type, namely one data module replaces two data modules, the data communication quantity between the two systems is reduced by 50%, and the communication reliability is improved laterally.
The IP address of the third-party system side is taken as a target, the network identification of the communication network segment of the third-party system DCS is calculated according to the corresponding subnet mask bit number, then the communication IP addresses of two non-redundant communication clamping pieces on the DCS side are designed, finally, a timely and accurate driving configuration file is compiled, and a communication mode that the same data is transmitted by two signal transmission channels simultaneously is realized from software;
the corresponding redundant data type INR/BINR/BOUTR is used, and meanwhile, the effectiveness of receiving/sending double-path data of the redundant data module is opened, so that real-time same-duplex input/output of the double-path data is realized; aiming at the data type of the real integer/digital output (IOUT/BOUT), the redundant data module is also used for realizing the double-path output of the data, and the communication of the data type of the real integer/digital input (IIN/BIN) is realized.
Claims (6)
1. A DCS double-path non-switching same-duplex modbus communication system comprises a DCS system and a third-party system communication structure, wherein system hardware equipment comprises two DCS platform non-redundant communication clamping pieces, two PLC platform Ehternet/IP communication clamping pieces, two Ethernet switches and a PLC side table master-slave rack;
the method is characterized in that: connecting a DCS side non-redundant communication card and a third-party system one-way communication card to the same Ethernet switch by using a TCP/IP network communication protocol through a network cable, and simultaneously configuring the other way of communication in a redundant manner, thereby realizing two-way one-to-one real-time communication on hardware;
a redundant PLC controller and a corresponding redundant conversion module are arranged at the side of a PLC controller of a third-party system, so that the main PLC controller can be switched to a standby controller when the main PLC controller fails;
two PLC platforms Ehternet/IP communication cards of a third-party system are connected through an Ethernet switch, and meanwhile, the two Ethernet switches are connected through a network cable for communication interconnection, so that the automatic exchange of IP addresses of a master PLC and a slave PLC can be realized when the master PLC performs master-slave conversion;
two non-redundant communication cards of the DCS are provided with the same target IP address, namely the address of the main PLC communication card of the third-party system, and the main PLC communication card can simultaneously receive and send communication data from two controllers at the DCS side through the Ethernet switch.
2. The DCS two-way switchless same-duplex modbus communication system of claim 1, wherein: a PLC communication card piece is connected with a DCS non-redundant communication card piece one to one, constitutes double-path one to one communication mode altogether, and then sets up two way same-duplex data transmission channels, and two way channels carry out data receiving and sending simultaneously.
3. The DCS two-way switchless same-duplex modbus communication system of claim 1, wherein: and the master-slave rack on the third-party system side is designed into a complete redundant structure, so that two paths of data are transmitted in real time in the third-party system.
4. The DCS two-way switchless same-duplex modbus communication system of claim 1, wherein: in a third-party system, the IP addresses are automatically exchanged when the PLC controller performs master-slave switching through the redundancy module, and then the same target IP address is configured for the DCS communication card.
5. The DCS two-way switchless same-duplex modbus communication system of claim 1, wherein: the DCS side non-redundant communication card only sets a unique target IP address.
6. The DCS two-way switchless same-duplex modbus communication system of claim 1, wherein: two non-redundant communication cards are provided with mutually independent drives.
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