CN102254122A - Programmable logic controller and management method of user programs thereof - Google Patents
Programmable logic controller and management method of user programs thereof Download PDFInfo
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- CN102254122A CN102254122A CN2010101800684A CN201010180068A CN102254122A CN 102254122 A CN102254122 A CN 102254122A CN 2010101800684 A CN2010101800684 A CN 2010101800684A CN 201010180068 A CN201010180068 A CN 201010180068A CN 102254122 A CN102254122 A CN 102254122A
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Abstract
The embodiment of the invention discloses a programmable logic controller, which comprises a data management module, wherein the data management module comprises a first extraction module for extracting first-class user programs in programmable logic controller (PLC) user programs, a program encryption module for encrypting the first-class user programs extracted from the first extraction module, a first storage module for storing the first-class user programs encrypted by the program encryption module to a storage of the PLC, a second extraction module for extracting second-class user programs in the PLC user programs and a second storage module for storing the second-class user programs extracted from the second extraction module to the storage of the PLC. Correspondingly, the embodiment of the invention also discloses a management method of the user programs of the programmable logic controller. By the programmable logic controller and the management method, the encryption can be performed aiming at part of user programs, so that the debugging and maintenance requirements of ordinary programs are retained, and the kernel user programs and data of the PLC are also better protected.
Description
Technical field
The present invention relates to electronic communication field, relate in particular to the management method of a kind of programmable logic controller (PLC) and user program thereof.
Background technology
Programmable logic controller (PLC) (PLC, Programmable Logic Controller) is a kind of specially for use the electronic installation of the digital operation operation that designs under industrial environment, and PLC has been widely used in the industrial automation field.The software systems of PLC mainly comprise system program and user program, and wherein, system program is used for the PLC system is carried out control and management, are provided by PLC manufacturer, can be by manufacturer's establishment or software marker's establishment.User program is the specific requirement according to production run control, the application program that the programming language that uses manufacturer to provide by the user is worked out voluntarily.
In the prior art; the external unit desk-top computer, notebook computer etc. of PLC configuration instrument (as be equipped with) can be directly uploaded to the user program among the PLC in the external unit in order to debugging or maintenance system; certain customers' program segment in these user programs and the data is the output that the program development personnel pay a lot of intellectual works; partial data relates to secret of the trade, should well be protected.Yet, the user can obtain and use these important user program and data easily by external unit at present, make the user program of part core and the safety of data can not get ensureing, cause damage for program developer or the user of system, how managing PLC user program and data better is problems that industry is studied always.
Summary of the invention
Embodiment of the invention technical matters to be solved is in the prior art that the user can obtain easily and uses the PLC user program, and the management method of a kind of programmable logic controller (PLC) and user program thereof is provided, and can protect PLC user program and data better.
In order to solve the problems of the technologies described above, a kind of programmable logic controller (PLC) that the embodiment of the invention proposes comprises data management module, and described data management module comprises:
First extraction module is used for extracting the first kind user program of PLC user program;
The program encryption module is used for the first kind user program that described first extraction module extracts is encrypted;
First memory module is used for the first kind user program after the described program encryption module encrypt is stored into the storer of PLC;
Second extraction module is used for extracting the second class user program of PLC user program;
Second memory module is used for the second class user program that described second extraction module extracts is stored into the storer of PLC.
Wherein, described data management module also comprises:
First logging modle is used to write down start address and the termination address that described first memory module stores described first kind user program into storer.
Wherein, described data management module also comprises:
Second logging modle is used to write down start address and the termination address that described second memory module stores the described second class user program into storer.
Wherein, described programmable logic controller (PLC) also comprises:
Program is transferred module, is used for transferring the described first kind user program and the second class user program according to the start address and the termination address of described first logging modle and described second logging modle record from storer;
The program deciphering module is used for that described program is transferred the first kind user program that module transfers and is decrypted;
The program execution module is used for carrying out the PLC user program according to the first kind user program after described second class user program and the deciphering of described program deciphering module.
Correspondingly, the embodiment of the invention discloses a kind of management method of programmable logic controller (PLC) user program, comprising:
Extract the first kind user program in the PLC user program;
Described first kind user program is encrypted;
First kind user program after encrypting is stored in the storer of PLC.
Wherein, the first kind user program after described will the encryption stores into after the step in the storer of PLC, also comprises:
The start address and the termination address of the described first kind user program of recording storage.
Wherein, the management method of described programmable logic controller (PLC) user program also comprises:
Extract the second class user program in the PLC user program;
The described second class user program is stored in the storer of PLC, and the start address and the termination address of the described second class user program of recording storage.
Wherein, after the start address of the start address of the described first kind user program of described recording storage and the step of termination address and the described second class user program of described recording storage and the step of termination address, also comprise:
Start address and termination address according to record are transferred the described first kind user program and the second class user program;
Described first kind user program is decrypted;
Carry out the PLC user program according to the first kind user program after described second class user program and the deciphering.
Implement the embodiment of the invention, have following beneficial effect:
Encrypt by the first kind user program that extracts in the PLC user program, realized demand according to the user, select targetedly certain customers' program (as a few sections kernel programs) is encrypted, satisfied the user and want the demand of encrypting separately at certain customers' program, other users can not use the encrypted core of this PLC user program after getting access to the PLC user program easily, simultaneously for unencrypted routine (common) user program part, the user can carry out conventional debugging, maintenance and configuration again.Other users will crack these core customer's programs; need find out encrypted certain customers' program; and be decrypted respectively and could use this PLC user program; increased the decoding number of times for other users; increased the decoding difficulty; solved that the user can obtain and use the PLC user program easily in the prior art, given the damnous problem of program developer, can protect PLC user program and data better.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of first embodiment of programmable logic controller (PLC) of the present invention;
Fig. 2 is the first example structure synoptic diagram of data management module of the present invention;
Fig. 3 is the second example structure synoptic diagram of data management module of the present invention;
Fig. 4 is the structural representation of storer of the present invention;
Fig. 5 is the structural representation of second embodiment of programmable logic controller (PLC) of the present invention;
Fig. 6 is the first embodiment process flow diagram of the management method of programmable logic controller (PLC) user program of the present invention;
Fig. 7 is the second embodiment process flow diagram of the management method of programmable logic controller (PLC) user program of the present invention;
Fig. 8 is the 3rd an embodiment process flow diagram of the management method of programmable logic controller (PLC) user program of the present invention;
Fig. 9 is the 4th an embodiment process flow diagram of the management method of programmable logic controller (PLC) user program of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The structural representation of first embodiment of programmable logic controller (PLC) of the present invention as shown in Figure 1, programmable logic controller (PLC) 1 comprises data management module 11, storer 12 and communication module 13, data management module 11 is connected with communication module 13 with storer 12 respectively, programmable logic controller (PLC) 1 is downloaded the PLC user program by communication module 13 from external unit, and by communication module 13 the PLC user program of local terminal is uploaded to external unit; Storer 12 can be non-volatile storer (as EEPROM or ferroelectric memory etc.), comprise user program piece, application data block and system data piece, be respectively applied for storage user program, application data and system data, the embodiment of the invention relates generally to the management to user program; Communication module 13 communicates by communication port and external unit, and transmission procedure and data have and download management function on the program; Data management module 11 comprises particularly: first extraction module 111, program encryption module 112, first memory module 113, second extraction module 115 and second memory module 116, wherein
Particularly, this first kind user program can be certain customers' program of selecting according to user self needs, selected a few sections user programs of thinking core as first kind user program as the user, or the user has selected the user program of a few sections expansions as first kind user program etc., first kind user program is the user program with higher commercial value in general, they or spent the bigger cost of development of program development merchant, or secret technology or data in the commercial production.First extraction module 111 extracts this first kind user program from the PLC user program that programmable logic controller (PLC) 1 is downloaded;
Particularly, program encryption module 112 can adopt DES (Data Encryption Standard) or RC4 scheduling algorithm that the first kind user program that first extraction module 111 extracts is encrypted;
Particularly, this second class user program can be certain customers' program of selecting according to user self needs, selected user program except that the user program of core as the second class user program as the user, or the user has selected user program except that the user program of expansion as the second class user program etc.In general, the second class user program is common user program paragraph, is the subroutine paragraph of developing maturation that the public can be public.Second extraction module 111 extracts the second class user program from the PLC user program that programmable logic controller (PLC) 1 is downloaded;
The first example structure synoptic diagram of data management module of the present invention as shown in Figure 2, data management module 11 comprises outside first extraction module 111, program encryption module 112, first memory module 113, second extraction module 115 and second memory module 116, also comprise: first logging modle 114 is used to write down start address and the termination address that first memory module 113 stores described first kind user program into storer 12.Particularly, each section user program takies start address and scope termination address between the decision of the storage space of storer 12 by the storage of this section user program, first logging modle 114 record, first memory module 113 stores the described first kind user program start address and the termination address of storer 12 into, so that follow-up calling and carrying out user program.
The second example structure synoptic diagram of data management module of the present invention as shown in Figure 3, data management module 11 comprises outside first extraction module 111, program encryption module 112, first memory module 113, first logging modle 114, second extraction module 115 and second memory module 116, also comprise: second logging modle 117, wherein
Need to prove, first kind user program can be N section user program, the second class user program can be M section user program, N and M are natural number, the value of N and M determines according to user's demand, whole user program generally is to adopt popular modular construction to write, and each section user program can be understood as the subroutine function of finishing some functions, and each section first kind user program is all encrypted respectively and stored; First extraction module 111 and second extraction module 112 can be same physical device, just extract each section user program according to different instruction; First memory module 113 and second memory module 116 can be same physical device, store each section user program into storer 12 respectively; First logging modle 114 and second logging modle 117 can be same physical device, write down start address and termination address that each section user program stores storer 12 into respectively.
Need to prove that also the user program (being first kind user program) that 12 pairs of segmentations of storer are encrypted carries out fragmented storage, in Fig. 4, the user program of encrypting is the M section, is stored in respectively in the M section storage space of storer 12; In addition, storer 12 also stores the common user program of N section (i.e. the second class user program), and PLC application data and system data.The start address of each section user program or storage space and termination address are recorded in respectively in corresponding first and second logging modles, so that extraction procedure section instruction accurately when calling.
The structural representation of second embodiment of programmable logic controller (PLC) of the present invention as shown in Figure 5, programmable logic controller (PLC) 1 comprises outside data management module 11, storer 12 and the communication module 13, also comprise: program is transferred module 14, program deciphering module 15 and program execution module 16, wherein
Program is transferred module 14, is used for transferring the described first kind user program and the second class user program according to the start address and the termination address of first logging modle 114 and second logging modle, 117 records from storer 12;
Particularly, when programmable logic controller (PLC) 1 needs execution PLC user program to control (when controlling) as the production scene being carried out robotization, program is transferred module 14 will transfer PLC user program in the storer 12, comprise the first kind user program and the second class user program.
Particularly, the first kind user program that 15 pairs of program deciphering modules are transferred is decrypted, and when having only decipherment algorithm and cryptographic algorithm coupling, the ability successful decryption obtains the first kind user program that can move.
Describe the structure of the programmable logic controller (PLC) 1 of the embodiment of the invention above in detail, below correspondingly, the management method of the programmable logic controller (PLC) user program of the accompanying drawings embodiment of the invention.
The first embodiment process flow diagram of the management method of programmable logic controller (PLC) user program of the present invention as shown in Figure 6 comprises:
Step S601: extract the first kind user program in the programmable logic controller (PLC) PLC user program;
Particularly, this first kind user program can be certain customers' program of selecting according to user self needs, selected a few sections user programs of thinking core as first kind user program as the user, or the user has selected the user program of a few sections expansions as first kind user program etc., the PLC user program downloads to behind the PLC or in process of downloading, therefrom extracts first kind user program;
Step S602: described first kind user program is encrypted;
Particularly, PLC encrypts this first kind user program and can adopt DES or RC4 scheduling algorithm;
Step S603: the first kind user program after will encrypting stores in the storer of PLC.
The second embodiment process flow diagram of the management method of programmable logic controller (PLC) user program of the present invention as shown in Figure 7 comprises:
Step S701: extract the first kind user program in the programmable logic controller (PLC) PLC user program;
Step S702: described first kind user program is encrypted;
Step S703: the first kind user program after will encrypting stores in the storer of PLC;
Step S704: the start address and the termination address of the described first kind user program of recording storage.
Particularly, each section user program takies start address and scope termination address between the decision of the storage space of storer by the storage of this section user program, after first kind user program after PLC will encrypt stores in the storer of PLC, record stores the described first kind user program start address and the termination address of storer into, so that follow-up calling and carrying out user program.
The 3rd embodiment process flow diagram of the management method of programmable logic controller (PLC) user program of the present invention as shown in Figure 8 comprises:
Step S801: extract the first kind user program in the programmable logic controller (PLC) PLC user program;
Step S802: described first kind user program is encrypted;
Step S803: the first kind user program after will encrypting stores in the storer of PLC;
Step S804: the start address and the termination address of the described first kind user program of recording storage.
Step S810: extract the second class user program in the PLC user program; Need to prove that step 810 can be carried out simultaneously with step S801, also can be between step S801-S804 any time carry out;
Particularly, this second class user program can be certain customers' program of selecting according to user self needs, selected user program except that the user program of core as the second class user program as the user, or the user has selected user program except that the user program of expansion as the second class user program etc., after PLC downloads to the PLC user program, therefrom extract the second class user program.
Step S811: the described second class user program is stored in the storer of PLC, and the start address and the termination address of the described second class user program of recording storage.
The 4th embodiment process flow diagram of the management method of programmable logic controller (PLC) user program of the present invention as shown in Figure 9 comprises:
Step S901: extract the first kind user program in the programmable logic controller (PLC) PLC user program;
Step S902: described first kind user program is encrypted;
Step S903: the first kind user program after will encrypting stores in the storer of PLC;
Step S904: the start address and the termination address of the described first kind user program of recording storage.
Step S910: extract the second class user program in the PLC user program; Need to prove that step 910 can be carried out simultaneously with step S901, also can be between step S901-S904 any time carry out;
Step S911: the described second class user program is stored in the storer of PLC, and the start address and the termination address of the described second class user program of recording storage;
Step S920: start address and termination address according to record are transferred the described first kind user program and the second class user program; Need to prove that step S920 just carries out after step S904 and step S911 are finished;
Particularly, (when the production scene being carried out robotization control) with the PLC user program of transferring in the storer, comprised the first kind user program and the second class user program when PLC need carry out the PLC user program and controls.
Step S921: described first kind user program is decrypted;
Particularly, PLC is decrypted the first kind user program of transferring, and when having only decipherment algorithm and cryptographic algorithm coupling, the ability successful decryption obtains the first kind user program that can move.
Step S922: carry out the PLC user program according to the first kind user program after described second class user program and the deciphering.
In sum, implement the embodiment of the invention, encrypt by the first kind user program that extracts in the PLC user program, realized demand according to the user, select targetedly certain customers' program (as a few sections kernel programs) is encrypted, satisfied the user and want the demand of encrypting separately at certain customers' program, other users can not use the encrypted core of this PLC user program after getting access to the PLC user program easily, simultaneously, for unencrypted routine (common) user program part, the user can carry out conventional debugging, safeguard and configuration again.Other users will crack these core customer's programs; need find out encrypted certain customers' program; and be decrypted respectively and could use this PLC user program; increased the decoding number of times for other users; increased the decoding difficulty; solved that the user can obtain and use PLC user program (comprising core customer's program) easily in the prior art, given the damnous problem of program developer, can protect PLC user program and data better.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Above disclosed only is preferred embodiment in the embodiment of the invention, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (9)
1. a programmable logic controller (PLC) comprises data management module, it is characterized in that, described data management module comprises:
First extraction module is used for extracting the first kind user program of programmable logic controller (PLC) PLC user program;
The program encryption module is used for the first kind user program that described first extraction module extracts is encrypted;
First memory module is used for the first kind user program after the described program encryption module encrypt is stored into the storer of PLC;
Second extraction module is used for extracting the second class user program of PLC user program;
Second memory module is used for the second class user program that described second extraction module extracts is stored into the storer of PLC.
2. programmable logic controller (PLC) as claimed in claim 1 is characterized in that, described data management module also comprises:
First logging modle is used to write down start address and the termination address that described first memory module stores described first kind user program into storer.
3. programmable logic controller (PLC) as claimed in claim 1 or 2 is characterized in that, described data management module also comprises:
Second logging modle is used to write down start address and the termination address that described second memory module stores the described second class user program into storer.
4. programmable logic controller (PLC) as claimed in claim 3 is characterized in that, described programmable logic controller (PLC) also comprises:
Program is transferred module, is used for rising according to described first logging modle and described second logging modle record
Beginning address and termination address are transferred the described first kind user program and the second class user program from storer;
The program deciphering module is used for that described program is transferred the first kind user program that module transfers and is decrypted;
The program execution module is used for according to described second class user program and the deciphering of described program deciphering module
After first kind user program carry out the PLC user program.
5. as the described programmable logic controller (PLC) of claim 1-4, it is characterized in that this first kind user program is core customer's program or as the data of secret of the trade, this second class user program is can be for debugging and the generic user program of safeguarding.
6. the management method of a programmable logic controller (PLC) user program is characterized in that, comprising:
Extract the first kind user program in the programmable logic controller (PLC) PLC user program;
Described first kind user program is encrypted;
First kind user program after encrypting is stored in the storer of PLC.
7. method as claimed in claim 6 is characterized in that, the first kind user program after described will the encryption stores into after the step in the storer of PLC, also comprises:
The start address and the termination address of the described first kind user program of recording storage.
8. method as claimed in claim 7 is characterized in that, also comprises:
Extract the second class user program in the PLC user program;
The described second class user program is stored in the storer of PLC, and the start address and the termination address of the described second class user program of recording storage.
9. method as claimed in claim 8, it is characterized in that, after the start address of the start address of the described first kind user program of described recording storage and the step of termination address and the described second class user program of described recording storage and the step of termination address, also comprise:
Start address and termination address according to record are transferred the described first kind user program and the second class user program;
Described first kind user program is decrypted;
Carry out the PLC user program according to the first kind user program after described second class user program and the deciphering.
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Application publication date: 20111123 |