CN105334729A - Method for redundancy switch of two independent PLC systems in railway locomotive depot signal control - Google Patents
Method for redundancy switch of two independent PLC systems in railway locomotive depot signal control Download PDFInfo
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- CN105334729A CN105334729A CN201510840179.6A CN201510840179A CN105334729A CN 105334729 A CN105334729 A CN 105334729A CN 201510840179 A CN201510840179 A CN 201510840179A CN 105334729 A CN105334729 A CN 105334729A
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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
- G05B9/00—Safety arrangements
- G05B9/02—Safety arrangements electric
- G05B9/03—Safety arrangements electric with multiple-channel loop, i.e. redundant control systems
Abstract
The invention discloses a method for the redundancy switch of two independent PLC systems in railway locomotive depot signal control. A control system adopts independently operated master and spare PLCs (programmable logic controllers) and an upper computer, WinCC monitoring software is installed on the upper computer, and a WinCC respectively carries out data exchange with the two PLCs in a bus communication mode; the WinCC detects the state of communication with the two PLCs once every 10 seconds, 'output enable signal' of the master PLC connected with the WinCC is set as '1', and 'output disabled signal' of the spare PLC is set as '0'; and when a CPU stops running caused by the master PLC due to any failure, the WinCC scans a stop signal, and immediately starts the output of the spare PLC. According to the invention, the automatic hot spared redundancy of two independent PLC control systems is implemented; the requirements on PLCs are not high, and the method can be implemented just when a communication port is provided; no hardware is required to be added, so that the method is low in cost and easy to implement; and only useful data are updated, and data of the spare PLC are updated only when data changes occur, so that the communication time and the database resources are saved.
Description
Technical field
The present invention relates to PLC control system, especially relate to two platform independent PLC system redundancy switching methods in the control of railway locomotive segment signal.
Background technology
Operate in two PLC(programmable logic controller (PLC)s in the control of railway locomotive segment signal at present) be isolated operation, switching each other, need manually to operate, switching comprises: the reading license number from the PLC previously run, and is written in the PLC that will run; The original PLC of manual switchover, to " STOP " state, switches the PLC that will run to " RUN " state; Such mode of operation, once the PLC run breaks down, data can not read, and cause very large trouble.
In order to the reliability of Guarantee control system in the PLC control system of prior art, the mode of most employing controller redundant configuration, in redundant configuration, the CPU module redundancy of PLC system, I/O module does not have redundancy, and two PLC are by the DP(data processing of redundancy) net realizes system redundancy.
In existing redundancy scheme, according to the PLC of Siemens 300 series, CPU module must be 315-DP, and configuring redundancy software package, soft redundancy could be realized.The CPU module of other models is used to realize.
According to the PLC of 400 series, CPU module must be 414H, and two CPU are undertaken by optic module connecting the hardware redundancy realizing CPU.
Above-mentioned employing controller (CPU module) redundancy mode, have ready-made scheme, its method of operation is the using and the reserved, spare CPU real-time update data, with run PLC carry out synchronous.
According to the identical control system of two covers: CPU module+I/O module, an output controls, and another runs but does not export, and realize its redundancy, also not have ready-made control program available.
The shortcoming of prior art:
1, solve only the redundancy of CPU, can't resolve the redundancy issue of the PLC system of two cover independent operatings;
2, to the restricted requirement of CPU module: hardware implementing redundancy requirement CPU is 414H, the redundancy requirement CPU that Redundancy Software bag realizes is 315-DP;
3, must be continuous print to the data demand of redundancy.Like this, do not need the data transmitted to be transmitted yet, the traffic is increased, adds the communications burden of CPU.
Summary of the invention
The object of the invention is, only carrying out useful data replacing with under the condition not increasing hardware cost, to realize the automatic hot backup redundancy of two PLC control system in the control of railway locomotive segment signal.
In order to realize object of the present invention.Following technical scheme is proposed:
Two platform independent PLC system redundancy switching methods during a kind of railway locomotive segment signal controls, described redundancy switching method adopts active and standby two PLC and the Monitor Computer Control System WinCC as supervisory control comuter of independent operating, wherein, WinCC carries out exchanges data with two PLC respectively by MPI bus communication mode.
After described Wincc runs and activates, login user, passes to the related data in main PLC in PLC for subsequent use.Related data comprises license number, route gating signal, teleseme mode control word and goat mode control word.
Described WinCC to check every 10 seconds once with the state of two PLC communications, connections in, its " permission outputs signal " is set to " 1 " by the main PLC of WINCC, and PLC for subsequent use " output disable signal " is set to " 0 ";
When main PLC causes CPU out of service because of any fault, WinCC scans this stop signal, starts the output of PLC for subsequent use at once.
The concrete steps of described redundancy switching method are:
1) communication connection of two PLC is first completed by MPI mode.
2) PLC first time powers on, and first this PLC " is allowed output signal " and is set to " 0 ".PLC produces " heartbeat " signal after powering on and running automatically, and understands another PLC operation conditions by communication, if can't detect the other side's " heartbeat " signal, the machine " is allowed output signal " and is set to " 1 ".
3) if two PLC are in running status, WINCC and two PLC all communicate normally, and the PLC that WINCC is " 1 " " allowing output signal " is considered as main PLC, and another is considered as PLC for subsequent use; WINCC upgrades data in PLC for subsequent use according to the related data change of main PLC, and related data comprises: teleseme mode control word, goat mode control word, license number, route gating signal.
4) in two PLC, if a running status, a halted state, all data that will transmit, by judging whether the PLC stopped powers on action, once this PLC power on signal be detected, are all sent to this PLC from the PLC run by WINCC.
The method that described step 2 detects PLC " heartbeat " is specially: the existence adopting two contrary bit representations " heartbeat " of fixed cycle change, the other side does not have " heartbeat ", after time delay, putting the machine " permission output signal " is " 1 ", and the automatic heating realizing two independent PLC control system exports for Redundant Control.
Described communication mode can also adopt PROFIBUS, PROFINET, MODBUS or CANBUS etc.
Compared to the prior art, of the present invention have following obvious advantage:
Two independent PLC of the prior art can not realize hot backup redundancy, can only manually switch, and need derivation and the importing of carrying out data in switching, process is long, present invention achieves the automatic hot backup redundancy of two independent PLC control system;
In prior art, PLC redundancy has the redundancy two kinds of hard-wired redundancy and software simulating, is CPU redundancy, and does not accomplish the redundancy of I/O module.Hard-wired redundancy communication adopts special communication interface, and adopts application specific hardware modules to connect, and software simulating redundancy also requires higher to CPU module.Less demanding to PLC of the present invention, as long as there is communication port, just can realize.Do not need to increase hardware, cost is low, realizes easily.
Redundancy of the prior art is that real-time data field upgrades, take resource and the time more; The present invention only upgrades useful data, and only just upgrades the data of PLC for subsequent use when data change, and saves call duration time and database resource.
Accompanying drawing explanation
Fig. 1 is two-node cluster hot backup scheme schematic diagram of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.
The present invention adopts upper monitoring computing machine as " coordinated scheduling " center, realizes redundancy.
Fig. 1 is two-node cluster hot backup scheme of the present invention, as shown in the figure, a PLC and supervisory control comuter that the present invention adopts two platform independent to run, namely, active and standby two PLC carry out data syn-chronization respectively by multipoint interface MPI communication modes and upper station of WinCC software, but only have a PLC to have output.
WinCC to check every 10 seconds once with the state of two PLC communications, connections in, its " permission outputs signal " is set to 1 by the PLC of WINCC, and PLC for subsequent use " output disable signal " is set to 0.Also this action is triggered when WINCC runs and activates picture.When a PLC causes CPU out of service because of any fault, WinCC scans this stop signal, starts the output of another PLC at once.
After Wincc runs and activates, login user, Wincc, by the related data (license number, route gating signal, teleseme mode control word, goat mode control word) in main PLC, passes in PLC for subsequent use.
The concrete steps of two platform independent PLC system redundancy switching methods of the present invention:
1, the communication connection of two PLC is first completed by MPI mode.
2, two PLC produce " heartbeat " signal separately, by communication, understand the other side's operation conditions, PLC first time powers on, first this PLC " is allowed output signal " to be set to " 0 ", can't detect the other side's " heartbeat " signal if be in operation, just the machine is put " allowing output signal " and be set to " 1 ".
If 3 two PLC are in operation, upper location supervisory (WINCC) and two PLC all communicate normally, WINCC " permission outputs signal " be the PLC of " 1 " as main PLC, another is PLC for subsequent use; WINCC upgrades data in PLC for subsequent use according to the related data change of main PLC, and related data comprises: teleseme mode control word, goat mode control word, license number, route gating signal.
If 4, PLC one runs stoppings, all data that will transmit, by judging whether the PLC of stopping powers on action, once PLC power on signal be detected, are all sent to this PLC from the PLC of operation by WINCC.
Communication mode detects the method for PLC " heartbeat ": adopt the position that two of fixed cycle change contrary, represent the existence of " heartbeat ", the other side does not have " heartbeat ", after time delay, putting the machine " permission output signal " is " 1 ", and the automatic heating realizing two independent PLC control system exports for Redundant Control.
Adopt the data mode of WINCC to realize the redundancy of data, complete the data syn-chronization of two PLC system.Less demanding to PLC of the method, as long as there is communication port, just can realize.Do not need to increase hardware, cost is low, realizes easily.
Adopt the mode that WINCC event triggers, data transmission is carried out in dispersion.Only just upgrade when data change, save call duration time.
The communication of system of the present invention can be adopted in various manners, as: PROFIBUS, PROFINET, MODBUS, CANBUS etc.
Above-described specific embodiment; further detailed description has been carried out to object of the present invention, technical scheme and beneficial effect; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. two platform independent PLC system redundancy switching methods in a railway locomotive segment signal control, it is characterized in that, described redundancy switching method adopts active and standby two PLC and the Monitor Computer Control System WinCC as supervisory control comuter of independent operating, wherein, described WinCC carries out exchanges data with two PLC respectively by MPI bus communication mode;
After described Wincc runs and activates, login user, in main PLC, the related data comprising license number, route gating signal, teleseme mode control word and goat mode control word passes in PLC for subsequent use;
Described WinCC to check every 10 seconds once with the state of two PLC communications, connections in, its " permission outputs signal " is set to " 1 " by the main PLC of WINCC, and PLC for subsequent use " output disable signal " is set to " 0 ";
When main PLC causes CPU out of service because of any fault, WinCC scans this stop signal, starts the output of PLC for subsequent use at once.
2. two platform independent PLC system redundancy switching methods in railway locomotive segment signal control according to claim 1, it is characterized in that, the concrete steps of described redundancy switching method are:
1) communication connection of two PLC is first completed by MPI mode;
2) PLC first time powers on, and first this PLC " is allowed output signal " and is set to " 0 ";
PLC produces " heartbeat " signal after powering on and running automatically, and understands another PLC operation conditions by communication, if can't detect the other side's " heartbeat " signal, the machine " is allowed output signal " and is set to " 1 ";
3) if two PLC are in running status, WINCC and two PLC all communicate normally, and the PLC that WINCC is " 1 " " allowing output signal " is considered as main PLC, and another is considered as PLC for subsequent use; WINCC upgrades data in PLC for subsequent use according to the related data change of main PLC, and related data comprises: teleseme mode control word, goat mode control word, license number, route gating signal;
4) in two PLC, if a running status, a halted state, all data that will transmit, by judging whether the PLC stopped powers on action, once this PLC power on signal be detected, are all sent to this PLC from the PLC run by WINCC.
3. two platform independent PLC system redundancy switching methods in railway locomotive segment signal control according to claim 2, it is characterized in that, the method that described step 2 detects PLC " heartbeat " is specially: the existence adopting two contrary bit representations " heartbeat " of fixed cycle change, the other side does not have " heartbeat ", after time delay, putting the machine " permission output signal " is " 1 ", and the automatic heating realizing two independent PLC control system exports for Redundant Control.
4. two platform independent PLC system redundancy switching methods in railway locomotive segment signal control according to claim 3, it is characterized in that, described communication mode is the bus communication modes such as MPI, PROFIBUS, PROFINET, MODBUS or CANBUS.
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| CN107463148A (en) * | 2017-08-29 | 2017-12-12 | 山信软件股份有限公司 | A kind of method of PLC redundancies switching |
| CN107807629A (en) * | 2017-11-08 | 2018-03-16 | 江苏驷博电气有限公司 | The recognition methods of failure universal logic module in programmable control system |
| CN109991945A (en) * | 2019-04-04 | 2019-07-09 | 三一汽车制造有限公司 | Mixing plant and concrete pump combined control system |
| CN111371345A (en) * | 2019-10-08 | 2020-07-03 | 九江赛晶科技股份有限公司 | Current control method of thyristor rectifying device in special track motor |
| CN113495522A (en) * | 2020-03-19 | 2021-10-12 | 南京南瑞继保电气有限公司 | Method and device for determining on-duty state of PLC in environment and equipment monitoring system |
| CN114397852A (en) * | 2022-01-18 | 2022-04-26 | 中天钢铁集团(南通)有限公司 | Method for detecting downtime of PLC host |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109991945A (en) * | 2019-04-04 | 2019-07-09 | 三一汽车制造有限公司 | Mixing plant and concrete pump combined control system |
| CN111371345A (en) * | 2019-10-08 | 2020-07-03 | 九江赛晶科技股份有限公司 | Current control method of thyristor rectifying device in special track motor |
| CN113495522A (en) * | 2020-03-19 | 2021-10-12 | 南京南瑞继保电气有限公司 | Method and device for determining on-duty state of PLC in environment and equipment monitoring system |
| CN113495522B (en) * | 2020-03-19 | 2022-12-13 | 南京南瑞继保电气有限公司 | Method and device for determining on-duty state of PLC in environment and equipment monitoring system |
| CN114397852A (en) * | 2022-01-18 | 2022-04-26 | 中天钢铁集团(南通)有限公司 | Method for detecting downtime of PLC host |
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Application publication date: 20160217 |