CN103546460A - Security features for an integral plc modem - Google Patents
Security features for an integral plc modem Download PDFInfo
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- CN103546460A CN103546460A CN201310451778.XA CN201310451778A CN103546460A CN 103546460 A CN103546460 A CN 103546460A CN 201310451778 A CN201310451778 A CN 201310451778A CN 103546460 A CN103546460 A CN 103546460A
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- demodulator
- modulator
- programmable logic
- logic controller
- message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/083—Network architectures or network communication protocols for network security for authentication of entities using passwords
Abstract
At least one exemplary embodiment of the present invention includes a method comprising receiving a connection request at a modem integral to a programmable logic controller, and allowing access to the programmable logic controller via the modem. At least one exemplary embodiment of the present invention includes a method comprising establishing a connection between a calling device and a modem integral to a programmable logic controller, and allowing the calling device access to the programmable logic controller via the modem. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. This abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).
Description
The application be that December 4, application number in 2002 are 02828053.9 the applying date, international application no is dividing an application of PCT/US02/38621, the denomination of invention patent application that is " a kind of security performance of integral PLC modem ".
The related application of cross reference
The application's requirement has priority to application on record below, and at this, it is all incorporated herein by reference:
The series of submitting to December 18 calendar year 2001, No.60/341,384, (agent's document No.2001P24074);
Accompanying drawing summary
By the detailed description to some exemplary embodiment below, will understand to some extent the present invention and various possible embodiment thereof, its relevant subsidiary sketch is:
Fig. 1 is the block diagram of an exemplary embodiment of system 1000 of the present invention;
Fig. 2 is the block diagram of an exemplary embodiment of massaging device 2000 of the present invention;
Fig. 3 is the flow chart of an exemplary embodiment of the inventive method 3000;
Fig. 4 is the flow chart of an exemplary embodiment of the inventive method 4000;
Fig. 5 is the flow chart of an exemplary embodiment of the inventive method 5000;
Fig. 6 is the flow chart of an exemplary embodiment of the inventive method 6000;
Fig. 7 is the flow chart of an exemplary embodiment of the inventive method 7000;
Fig. 8 is the top view of a demonstration EM241 modem module 8000 of the present invention;
Fig. 9 is the screen shot of an exemplary graphics user interface 9000 of the present invention;
Figure 10 is the screen shot of an exemplary graphics user interface 1000 of the present invention; And
Figure 11 is the screen shot of an exemplary graphics user interface 11000 of the present invention.
Describe in detail
The present invention has at least an exemplary embodiment to comprise a kind of system, this system comprises through adaptation can become whole a kind of modulator-demodulator with a kind of programmable logic controller, and adaptive this modulator-demodulator, make it be convenient to communicate by the primary processor of communication medium and this programmable logic controller.The present invention has at least an exemplary embodiment to comprise a kind of method, and the method comprises the message receiving from a kind of programmable logic controller primary processor, in this this message of programmable logic controller internal modulation, and transmits this message by communication network.The present invention has at least an exemplary embodiment to comprise a kind of method, the method is included in a kind of programmable logic controller place and receives the message from communication network, this message of demodulation in this programmable logic controller, and this message is passed to the primary processor of this programmable logic controller.
The present invention has at least an exemplary embodiment to comprise a kind of system, this system comprises with the first programmable logic controller becomes the first whole modulator-demodulator, and become whole second modem with the second programmable logic controller, and adaptive the first modulator-demodulator communicates by communication network and second modem.The present invention has at least an exemplary embodiment to comprise a kind of method, the method comprises makes the first modulator-demodulator and second modem coupling, wherein the first modulator-demodulator and the first programmable logic controller are become integral body, second modem is connected with the second programmable logic controller, and data shift between the first modulator-demodulator and second modem.
The present invention has at least an exemplary embodiment to comprise a kind of method, the method comprises is becoming whole the first modulator-demodulator place format by message with the first programmable logic controller, and by communication network, this formatted message is sent out from the first modulator-demodulator.The present invention has at least an exemplary embodiment to comprise a kind of system, this system comprises for message is being become to the device that whole modulator-demodulator place formats with programmable logic controller, and the device this formatting messages being sent out from modulator-demodulator by communication network.
The present invention has at least an exemplary embodiment to comprise a kind of method, and the method is included in programmable logic controller becomes whole modulator-demodulator place reception connection request, and allows by modulator-demodulator, programmable logic controller to be conducted interviews.The present invention has at least an exemplary embodiment to comprise a kind of method, the method be included in calling device and and programmable logic controller become between whole modulator-demodulator and connect, and allow this calling device by modulator-demodulator, programmable logic controller to be conducted interviews.
Fig. 1 is the block diagram of an exemplary embodiment of system 1000 of the present invention.System 1000 can comprise the first programmable logic controller (" PLC ") 1100, and this PLC comprises the primary processor 1120 with modulator-demodulator 1140 couplings by connector 1130.In certain embodiments, modulator-demodulator 1140 can with connector 1300, for example system backplane and/or expansion input/output bus, be connected, thereby a port of processor 1200 freed out.
Modulator-demodulator 1140 can be become integral body with PLC1100.That is,, once install, modulator-demodulator 1140 is exactly parts of PLC1100, rather than freestanding.Modulator-demodulator 1140 can comprise that one for example has, the communication processor 1150 of the data storage device 1160 of two-port RAM, and communication interface 1170, telephone line interface for example, radio network interface, cellular network interface, LAN interface, broadband cable interface, etc.Modulator-demodulator 1140 can form connection, and/or can be to can comprise that the message of data receives, reads, processes, formats, configures, modulation, rectification, transmission and/or transmit.Modulator-demodulator 1140 can modularization in design, has the frame of self, can draw the energy from connector 1130 and/or PLC1100.
Modulator-demodulator 1140 can be connected to communication network 1200, Public Switched Telephone Network (PSTN) for example, and wireless network, cellular network, local area network (LAN), the Internet, etc.That be connected with network 1200 can also be the 2nd PLC1300, and this PLC also can have a whole modulator-demodulator 1320 being coupled by connector 1330 and primary processor 1340.
What be connected with network 1200 can also be first information device 1400, routine call for example, and telephone device, cell phone, mobile terminal, blue-tooth device, communicator, beep-pager, facsimile machine, terminal, personal computer, etc.In addition, a kind of the second massaging device 1500 also can be connected with network 1200, and this second massaging device 1500 can by or network 1200, or second network 1520 and the 3rd massaging device 1600 communicate.
Fig. 2 is the block diagram of an exemplary embodiment of massaging device 2000 of the present invention.Massaging device 2000 can representative graph any massaging device 1400,1500 or 1600 of 1 li.Massaging device 2000 can comprise some parts as you know, one or more network interfaces 2100 for example, one or more processors 2200, the memory 2300 of one or more include instructions 2400, and/or one or more I/O (I/O) install 2500, etc.
In one embodiment, network interface 2100 can be phone, cell phone, cellular modem, phone data modulator-demodulator, fax modem, wireless set, Ethernet card, cable modem, digital subscriber line interface, bridge, hub, router, or other similar device.
Each processor 2200 can be general purpose microprocessor, for example, by California, and the Pentium III series microprocessor that the Intel Company of SantaClara manufactures.In another embodiment, processor can be application-specific IC (ASIC), or field programmable gate array (FPGA), according to one embodiment of the invention, at least, in one Part Methods, planned it in its hardware and/or firmware, to be achieved.
Instruction 2400 available software are implemented, and this software can be taked any in numerous forms that this area known.
It can be a kind of audio devices and/or video-unit that any I/O (I/O) installs 2500, comprises, for example, monitor, display, keyboard, keypad, touch keyboard, indicator device, microphone, loud speaker, video camera, camera, scanner, and/or printer, they all comprise the port that a kind of/O device can articulate with it or connect.
Fig. 3 is the flow chart of an exemplary embodiment of the inventive method 3000.Activating at 3100 o'clock, the whole modulator-demodulator of PLC receives the message from PLC primary processor.Activating at 3200 o'clock, this message is processed by modulator-demodulator.Activating at 3300 o'clock, the message of processing is modulated, and activating at 3400 o'clock, by the message of this modulation, by communication network, for example telephone network, transmits.This modulated message can be observed numerous configurations, agreement, and/or any in standard.For example, modulated message can be a kind of 10, V.34, and ASCII, TAP message.
Fig. 4 is the flow chart of an exemplary embodiment of the inventive method 4000.Activating at 4100 o'clock, the whole modulator-demodulator of PLC is by network receipt message.Activating at 4200 o'clock, this message is demodulated.Activating at 4300 o'clock, modulator-demodulator is processed demodulated message.Activating at 3400 o'clock, the message of processing is being passed to the primary processor of PLC.
Fig. 5 is the flow chart of an exemplary embodiment of the inventive method 5000.Activating at 5100 o'clock, becoming whole modulator-demodulator with a PLC can be coupled with the modulator-demodulator of the 2nd PLC.The modulator-demodulator of the 2nd PLC can be become integral body with the 2nd PLC, also can separate with the 2nd PLC.Activating at 5200 o'clock, the modulator-demodulator of a PLC can modulating data, and is activating at 5300 o'clock, the data of modulation is sent to the modulator-demodulator of the 2nd PLC.Once the modulator-demodulator of the 2nd PLC receives this modulating data, just these data are carried out to demodulation, thereby and responded, for example data are processed and/or data are given to the processor of the 2nd PLC, or answer the modulator-demodulator of a PLC.Activating at 5500 o'clock, the modulator-demodulator of a PLC can be removed coupling with the modulator-demodulator of the 2nd PLC.
Fig. 6 is the flow chart of an exemplary embodiment of the inventive method 6000.Activating at 6100 o'clock, becoming whole modulator-demodulator with PLC and receive the message explanation from PLC processor.In some exemplary embodiment, message can be beep-page message explanation.Activating at 6200 o'clock, modulator-demodulator reads this beep-page message explanation.Activating at 6300 o'clock, modulator-demodulator by, for example dial the telephone number that message explanation comprises, determine the device that will access.Activating at 6400 o'clock, modulator-demodulator is identified the one or more data variables in message explanation.Activating at 6500 o'clock, modulator-demodulator obtains and the illustrated corresponding data value of data variable, and their are formatd and they are inserted in message.Activating at 6600 o'clock, modulator-demodulator can be by definition and/or other configuration definition device of message explanation, DIP switch for example, and the definition of firmware etc., uses one or more message arrangement to message.For example, modulator-demodulator can by numerous pre--select form, modem standard, and/or any in agreement is applied to this message.Activating at 6700 o'clock, modulator-demodulator may according to message explanation and/or message arrangement by message by communication network be sent to a kind of can paging equipment, and/or a kind of communicator, phone for example, cell phone, " intelligence " phone (for example HandspringTreo-class device), beep-pager, paging service, message sends service (for example Blackberry), terminal, personal computer, individual organizes assistant's (for example Palm-class device), wireless device, mobile terminal, etc.
Fig. 7 is the flow chart of an exemplary embodiment of the inventive method 7000.Activating at 7100 o'clock, becoming whole modulator-demodulator with PLC and receive the connection request from calling device.Activating at 7200 o'clock, modulator-demodulator requires user name and/or password to calling device.Activating at 7300 o'clock, modulator-demodulator receives user name and/or password.Activating at 7400 o'clock, modulator-demodulator is verified the user name receiving and/or password, if verify that correctly modulator-demodulator is admitted this result.
Activating at 7500 o'clock, modulator-demodulator is from calling device and/or storage device, and for example memory or database, obtain call-back telephone number.Activating at 7600 o'clock, modulator-demodulator may compare the call-back telephone number obtaining from calling device and the call-back telephone number obtaining from storage device, verifies call-back telephone number.Activating at 7700 o'clock, modulator-demodulator utilization connects, and inserts connection request, and/or calls pre--programming ans back this connection is approved.Activating at 7800 o'clock, modulator-demodulator allows this calling device to conduct interviews to PLC.
Some exemplary embodiment of the present invention comprises a kind of modem module that can allow PLC directly be connected with analog of telephone line.Some exemplary embodiment of this modem module is sometimes known as EM241 modem module here, and some exemplary embodiment of PLC is sometimes known as S7-200 here.
Some exemplary embodiment of the present invention can be supported in the communication between PLC and PLC programming aid, and an exemplary embodiment of this PLC programming aid is sometimes known as STEP7-Micro/WIN here.Some exemplary embodiment of the present invention comprises the modem module of the controlled person's rtu protocol of a kind of Modbus of support.In the communication between EM241 modem module and PLC, can in the expansion I/O bus at PLC, carry out.
PLC programming aid can provide a kind of software wizard program, and this program can contribute to the installation of remote modem or modem module, for connecting local PLC and remote-control device.
The performance of EM241 modem module
Fig. 8 is the top view of the EM241 modem module 8000 of a demonstration, and this module comprises frame 8100, a series of indicator lights 8200 for display module 8000 states; For link block and PLC interface, as I/O expansion bus, connector 8300; For module 8000 being configured to one or more country code change over switches 8400 of a concrete country; And/or communications network interface 8500, as RJ11 socket.One or more country code change over switches 8400 can be used manual manipulation, and can be coupled with firmware, and this firmware is read a country code from least one change over switch 8400, and setup of modulator-demodulator 8000 is for specifying the operation of country.
Description is below applicable to some embodiment of EM241 modem module 8000, but should not regard as the restriction to it.
EM241 modem module can be by the Function Extension of S7-200Micro PLC to telecommunication.This module is supported four kinds of patterns:
(a) pattern 1 is for Micro/WIN programming and debugging.In certain embodiments, do not require installation.As long as plug and play.
(b) pattern 2 is for Modbus master control person/controlled person's communication.
(c) mode 3 sends and digital paging for alphabet-numeric playing message.
(d) pattern 4 for example, for arrive-CPU of CPU-communication, the communication between each S7-200Micro PLC.
In addition, EM241 modem module also can possess following performance:
(e) it can directly be connected with the expansion I/O bus of S7-200, no longer needs to take the communication port of CPU.
(f) S7-200PLC can be directly connected to analog of telephone line.
(g) baud rate can regulate voluntarily according to the quality of line between 300 bauds and 33.6k baud (V.34bis).
(h) provide overseas call line interface.
(i) utilize hardware rotation change over switch can support a plurality of national standards.All other settings can be stored in PLC
Variable store in.
(j) can support pulse dialing or dual-tone dialing.
K) there is the modem interface to STEP7-Micro/WIN, (long-range for programming and trouble hunting
Service).
(l) support Mobus rtu protocol.
(m) arrive-CPU of CPU-or arrive-Modbus data of CPU-shift.
(n) support numeral and text paging.
(o) support SMS message to send.
(p) support callback feature and/or password protection
The configuration of EM241 modem module can be stored in CPU.Can apply STEP7-Micro/WIN modulator-demodulator expansion wizard program configure EM241 modem module.
Overseas call line interface
EM241 modem module can be V.34(33.6k baud of a kind of standard), 10-position modulator-demodulator, and can be compatible with most of built-in and external pc modems.
EM241 modem module can with there is the module of being arranged on before the telephone wire of 6-position 4-line RJ11 connector be connected, as shown in Figure 8.When seeing above, the configuration of RJ11 connector is, pin 3 is ring, and pin 4 is contact.Connect and also allow conversely.
In some cases, in order to be connected to the standard phone line terminal of various countries, can adopt a kind of adapter to change RJ11 connector.
Modulator-demodulator and telephone line interface can utilize external 24V DC power supply.This power supply can be connected with CPU probe power, or is connected with a kind of external power supply.The grounding terminals of EM241 modem module is connected with the ground of system.
After module for power supply, EM241 modem module is configuring telephone interface automatically, is used to specify the operation of country origin.Two rotary switches on module front panel are selected country code.In some embodiment, can be before giving the power supply of EM241 modem module, change over switch is set to the country that will select, as shown in table 1.
Table 1
STEP7-Micro/WIN interface
EM241 modem module can allow by telephone wire, to communicate (remote service) with STEP7-Micro/WIN.When application STEP7-Micro/WIN, do not need S7-200CPU to be configured or programming, just can be EM241 modem module as remote modem.
When employing has the EM241 modem module of STEP7-Micro/WIN, can follow following steps:
(q) disconnect S7-200CPU power supply, and EM241 modem module is articulated on I/O expansion bus.?
Under the state that S7-200CPU switches on power, do not articulate any I/O module.
(r) telephone wire is connected to EM241 modem module.
(s) 24V DC power supply is connected to EM241 modem module wiring terminal unit.
(t) ground of EM241 modem module wiring terminal unit is connected with the ground of system.
(u) country code change over switch is set.
(v) give S7-200CPU and the power supply of EM241 modem module.
(w) configuration STEP7-Micro/WIN and 10-position modem communication.
Modbus rtu protocol
EM241 modem module can be configured to such an extent that as the controlled person of Modbus RTU, respond.In this case, EM241 modem module receives Modbus by modem interface and asks, and translates these requests, and data are transferred in CPU or from CPU and shifted away.Then EM241 modem module produces Modbus response, and by modem interface, it is sent out.
In certain embodiments, if when EM241 modem module configures to such an extent that respond as the controlled person of Modbus RTU, STEP7-Micro/WIN can not communicate by letter with EM241 modem module by telephone wire.
The Modbus function of EM241 modem module support is shown in table 2:
Table 2
In a request, Modbus function 4 and 16 can be carried out read and write to 125 occupy-place registers (250 bytes of V memory) at most.Function 5 and 15 can write the output image register of CPU.These values can be rewritten by user program.
5 or 6 character values that contain data type and bias can be write as in Modbus address.In this case, previous or two characters can specified data type, and then suitable value can be selected in four characters within data type.Modbus master control set can be correct Modbus function by address mapping.
Table 3 provides the Modbus address that EM241 modem module is supported, and Modbus address mapping the address to S7-200CPU.
Table 3
Can expand wizard program with modulator-demodulator and in EM241 modem module, create configuration block to support Modbus rtu protocol.Before application Modbus agreement, EM241 modem module configuration block can be downloaded in cpu data piece.
Paging and SMS message send
EM241 modem module is supported digital paging message and text paging message, and SMS(Short Message Service) message sends to (being supported by cellular provider) cell phone.This message and telephone number can be stored in EM241 modem module configuration block, and this configuration block can be downloaded in the data block of S7-200CPU.
Can application of modulation demodulator expansion wizard program be that EM241 modem module configuration block creates message and telephone number.Can also application of modulation demodulator expansion wizard program creation procedure code to allow the transmission of program initiation message.
Digital paging
Digital paging can utilize the dual-audio of button dual tone phone to send digital value to beep-pager.EM241 modem module can be dialled desired paging service, waits voice message and completes, and dual-audio corresponding with numeral in beep-page message is sent.In beep-page message, can allow numeral 0 to 9, asterisk (*), A, B, C and D.Beep-pager is used for showing asterisk and A, B, and the actual characters of C and D can be determined by beep-pager and paging service provider.
Text paging
Text paging can send to ，Bing Conggai provider of Yi Ge paging service provider to send to beep-pager alphanumeric message.Generally text paging provider has the modem line that receives text paging.EM241 modem module can adopt phone locator alphanumeric agreement (TAP) to send text message to service provider.Many text pagings provider adopts this agreement receipt message.
Short Message Service (SMS)
Some cell phone service, comprises the service of those GSM compatibilities, supports the message of Short Message Service (SMS) to send.SMS allows EM241 modem module to send message by analog telephone alignment SMS provider.Then SMS provider sends cell phone to message, and message can appear in the text display of phone.EM241 modem module can adopt phone locator alphanumeric agreement (TAP) and/or Universal Computer Protocol (UCP) XiangSMS provider to send message.
In text and SMS message, embed variable
EM241 modem module can be embedded into the data value from CPU in text message, and makes data value format according to the explanation in message.User can specify the digital number on the decimal point left side and the right, no matter and decimal point be a fullstop or a comma.When user program order EM241 modem module transmits text message, EM241 modem module can be retrieved this message from CPU, determine and in message, need what CPU value, and from CPU, retrieve those values, and/or before message is sent to service provider, these values are formatd and inserted in text message.
Can from CPU, read the telephone number that message sends provider by CPU scan cycle repeatedly, message, and the variable that embeds message.The variable that embeds message can be constantly updated in sending message process.If message comprises a plurality of variablees, these variablees can read by the Multiple-Scan circulation of CPU.
Data shift
EM241 modem module allows user program that data are transferred to another one CPU or Modbus device by telephone wire.Can utilize modulator-demodulator expansion wizard program configuration data to shift and telephone number, and they are stored in EM241 modem module configuration block.This configuration block can be downloaded in the data block of S7-200CPU.Modulator-demodulator expansion wizard program can also creation procedure code, to allow user program log-on data shift.
Data shift can or a request from remote-control device reading out data, an or request that data is write to remote-control device.The data that read or write shift can be between 1 and 100 data words.It can be that data mobile is moved out in the V memory of the CPU articulating or therefrom that data shift.
Modulator-demodulator expansion wizard program can allow user to create the data transfer to remote-control device, comprises from remote-control device list and reading, and writes, or both from remote-control device, read also and write to remote-control device to remote-control device list.
Data shift the configuration protocol that can adopt EM241 modem module.PPI agreement (it is corresponding with STEP7-Micro/WIN) is supported in vacation as configured EM241 modulator-demodulator mould here, and EM241 modem module can adopt PPI agreement transferring data.Modbus rtu protocol is supported in vacation as configured EM241 modem module, and data shift and can adopt Modbus rtu protocol to transmit.
Can from CPU, read by CPU scan cycle repeatedly telephone number, data transfer request and the data that shifting of remote-control device.Generally, when sending message, user program is not modified to telephone number or message, or when sending message, the data that shifting is modified.
If remote-control device is another modem module, can key in the password of this remote modem module in telephone number configuration, utilize password function to carry out data transfer.
Password protection
The password security of EM241 modem module can be optional, and can utilize modulator-demodulator expansion wizard program to realize.In certain embodiments, the password that EM241 modem module adopts is different with the password of CPU.But the password of EM241 modem module can be independent, contain, 8-character for example, password, caller, before being allowed to the CPU that access articulates, can provide this password to EM241 modem module.This password can be used as a part for EM241 modem module configuration block, is stored in the V memory of CPU.EM241 modem module configuration block can be downloaded in the data block of the CPU articulating.
If the password security that CPU has realizes in system data piece, caller can provide CPU password to obtain access password defencive function.
Callback security
The callback feature of EM241 modem module can be optional, and can utilize modulator-demodulator expansion wizard program to be configured.Callback feature can only allow predetermined telephone number access CPU, to additional fail safe is provided to the CPU articulating.In the time can realizing callback feature, EM241 modem module can be answered any one calling, and then authenticating caller disconnects line.If caller is authorized, EM241 modem module can be dialled the predetermined telephone number to this caller, and allows access CPU.
[61] EM241 modem module is supported three kinds of callback mode:
(a) the single predetermined telephone number of callback
(b) a plurality of predetermined telephone numbers of callback
(c) any one telephone number of callback.
Utilize choosing to hook the suitable option in modulator-demodulator expansion wizard program, then define call-back telephone number, can select callback mode.Call-back telephone number can be stored in the configuration block of EM241 modem module, and this configuration block is stored in the data block of the CPU articulating.
The simplest callback form is to single predetermined telephone number callback.If only stored an ans back in the configuration block of EM241 modem module, when when no matter EM241 modem module answer a calling, can notification call person can carry out callback, disconnect with caller, and by the ans back dialing of appointment in configuration block.
EM241 modem module also can be supported a plurality of predetermined telephone numbers of callback.In this pattern, can inquire telephone number to caller.If the number that the numbers conform providing defines in advance in EM241 modem module configuration block, EM241 modem module can disconnect and being connected of caller, and utilizes the telephone number conforming in configuration block to carry out callback.User can configure at most 250 ans backs.
When having a plurality of predetermined ans back, likely provide many schemes.In certain embodiments, when being connected to EM241 modem module, the number in the ans back providing and EM241 modem module configuration block is strict conformance except the first two numeral.For example, if because needs are dialled outside line (9) and long-distance (1), the callback of configuration is 91(123) 4569999, the ans back providing can be any one in the middle of below:
（a）91(123)4569999
（b）1(123)4569999
（c）(123)45699999
Can think that above-mentioned all telephone numbers are all the ans backs matching.EM241 modem module, when carrying out callback, can adopt this call-back telephone number from its configuration block, is 91 (123) 4569999 in this example.In certain embodiments, when comparing ans back, only adopt the numerical character in telephone number.When comparing ans back, some character, as comma or bracket, can be left in the basket.
Any one telephone number of callback can be expanded in wizard program at modulator-demodulator, utilize to select " can any telephone number of callback " option, in callback layoutprocedure, arranges.If selected this option, EM241 modem module can be answered calling, and asks call-back telephone number.When caller provides after telephone number, EM241 modem module can disconnect, and dials that telephone number.This callback mode provides a kind of permission that phone fee bill is drawn up to the mode connecting to EM241 modem module phone, and does not need S7-200CPU that fail safe is provided.If adopted this callback mode, for safety can be applied EM241 modem module password.
EM241 modem module password and callback feature can work simultaneously.EM241 modem module can require caller that correct password is provided before processing callback.
The configuration form of EM241 modem module
All text messages, telephone number, data transinformation, ans back and other option can be stored in modem module configuration form, and this form can be written in the V memory of S7-200CPU.Modulator-demodulator expansion wizard program instructs user by creating modem module configuration form.Then STEP7-Micro/WIN can insert EM241 modem module configuration form in data block, and this data block can be downloaded in S7-200CPU.
EM241 modem module can be when starting, CPU any, once stop-arrive-move 5 seconds of changing within, from CPU, read this configuration form.As long as EM241 modem module and STEP7-Micro/WIN are online, EM241 modem module just need to not read new configuration form from CPU.If when EM241 modem module is online, downloaded a new configuration form, while finishing during online, EM241 modem module can be read this new configuration form.
If EM241 modem module detects a mistake in configuration form, good (MG) LED of the module on module front panel will glittering and flash.User can check the PLC information screen in STEP7-Micro/WIN, or reads SMW220(module slot 0) in the numerical value of relevant configuration error information.EM241 modem module configuration error is listed in table 4.If user adopts modulator-demodulator expansion, wizard program creates EM241 modem module configuration form, and STEP7-Micro/WIN can check data before creating configuration form.
Table 4
The state LEDs of EM241 modem module
EM241 modem module can have 8 state LEDs on front panel.Table 5 has illustrated these states LEDs.
Table 5
Utilize modulator-demodulator expansion wizard program configuration EM241 modem module
User can start modulator-demodulator expansion wizard program from STEP7-Micro/WIN tools menu or from the tools section of navigation bar.
For utilizing this wizard program, conventionally to edit user's scheme, and be set to symbolic address pattern.On the first screen of modulator-demodulator expansion wizard program, user can select
join puteM241 modem module, and press and hit
next step>.
Modulator-demodulator expansion wizard program can be obtained the position of the relative S7-200CPU of EM241 modem module to produce correct program code.User can press and hit read through model button and automatically read the position that is articulated in the intelligent object on CPU.Expansion module can be since 0 serial number.User can double-click
eM241 modem moduleto module position field configuration is arrived, or be arranged into the position of EM241 modem module.
Password protection screen allows user to implement password protection to EM241 modem module, and/or for 1-8 character of this module appointment be password.This password can be separate with the password of S7-200CPU.When module is subject to password-protection, any one wants the people who is connected with S7-200CPU by EM241 modem module to be all required the password that provides correct.If requirement, user can select password protection, and keys in password.
EM241 modem module is supported two communication protocols: PPI agreement (for communicating by letter with STEP7-Micro/WIN), and ModbusRTU agreement.Agreement is selected to depend on and is being applied, as the type of device of telecommunication object.At EM241 modem module, respond a calling, also have when EM241 modem module starts cpu data transfer, this set can be controlled the communication protocol adopting.
User can be configured to send digital massage and text message to beep-pager to module, or to the cell phone service of sending SMS message (SMS) message.User can select hook can send message test frame, and presses and hit configuration messages transmission ... button, to define message and recipient's telephone number.
When the message that will send to beep-pager or cell phone is set, user can define message and telephone number.User can select configuration messages to send the message marking on screen, and presses and hit new message button.Then user can key in the text of message and specify any one the cpu data value that will insert message.For cpu data value being inserted to message, user can arrive Data Position cursor movement, and presses and hit data inserting ... button.User can specify the address (being VW100) of cpu data value, the numeral of display format (having the positive and negative integer dividing) and decimal point left and right.It is fullstop or comma that user can also specify decimal point.
Digital paging message can be restricted to digital 0-9, alphabetical A, B, C and D, and asterisk (*).The maximum of digital paging message allows length to be changed by service provider.The length of text message can be until 119 characters can comprise any alphanumeric character.Text message can comprise the embedding variable of arbitrary number.
Embedding variable can be from the V in the CPU articulating, M, SM, I, Q, S, T, C or AI memory.Hexadecimal data can show with guiding ' 16# '.Number of characters in numerical value is determined according to the size of variable.For example, VW100 is shown as 16#0123.If data value is integer or the floating-point numerical value that has sign, decimal point left-hand digit number can, enough greatly to show the expected range of numerical value, comprise negative sign.If data format is integer, and on the right of decimal point, the number of numeral is not 0, and integer value can be shown as the integer of scale.For example, if VW100=1234, and have 2 numerals on the right of decimal point, data are shown as ' 12.34 '.If data value is greater than the size showing in description field, EM241 modem module can be placed # character in all character positions of data value.
Can send on screen and select telephone number mark to be configured telephone number at configuration messages.For increasing new telephone number, user can press and hit new phone number ... button.Once telephone number configures, just it can be added in scheme.User can be able in the telephone number row for application highlight this telephone number, and presses and hit right arrow box this telephone number is added in current scheme.Once user adds this telephone number in current scheme to, user can select this telephone number, and increases a symbolic name can to this number, for user program, applies.Telephone number can be comprised of several fields, and the message delivery type that they can be selected according to user changes.
Message sends agreement and selects to tell what agreement EM241 modem module ，Xiang messenger service provider will adopt while sending message.Alphanumeric pager is only supported digital protocol.Text paging service requires TAP(phone locator alphanumeric agreement conventionally).SMS message sends provider or is supported by TAP, or by UCP(Universal Computer Protocol) support.Conventionally there are three kinds of different UCP services to send for SMS message.Most of providers support order 1 or 51.User can HeSMS provider consult agreement and the order of determining that this provider requires.
Description field can allow user to add textual description to telephone number.Phone number field can be the telephone number that message sends service provider.For text message, this can be the telephone number that service provider is used for receiving the modem line of text message.For digital paging, this can be the telephone number of beep-pager self.EM241 modem module allows phone number field at most to 40 characters.Be the character allowing in telephone number below, EM241 modem module can utilize them outwards to dial:
0-9 allows to use keyboard of telephone set
A, B, C, D, *, # DTMF numeral (only dual-tone dialing)
, suspend dialing 2 seconds
! Generation circuit switching flashes
@waits quietly 5 seconds
W waited dialing tone before continuing
() ignores (can be used for the format of telephone number)
Specifying Pager ID or cellular telephone number code field is the place that user can key in pager number or the cell phone number of message recipient.The character comprising can arrive 20.For TAP message, password field can be optional.Some provider requires password, but this field can be left blank conventionally.The password that EM241 modem module allows can be until 15 characters.
The phone number field that starts allows in SMS message, EM241 modem module to be differentiated.Some adopts the service provider of UCP to require this field.Some service provider requires this field to comprise minimum number of characters.EM241 modem module allows to 15 characters at most.
In the situation that EM241 modem module and service provider modem can not be reached an agreement with regard to modem standard, can application of modulation demodulator criteria field.Damaged is baud V.34(33.6k).
When transmitting message to service provider, data format field allows user to regulate the applied data bit of modem module and parity check.General TAP adopts 7 data bit and even parity check, but some service provider can adopt 8 data bit, there is no parity check.UCP can adopt 8 data bit, there is no parity check.User can discuss to determine what setting of employing with service provider.
User can configure EM241 modem module, and data are transferred to (if selection is PPI agreement) in another S7-200CPU, or data are transferred to Modbus device (if selection is Modbus agreement).User can select hook can shift cpu data check box, and presses and hit configuration CPU – and arrive ... button, to define the telephone number of data transfer and remote-control device.
When the data that arrange shift, be CPU – Dao – CPU or CPU – during Dao – Modbus, user can define the telephone number of the data that will shift and remote-control device.Accomplish these, user can shift and on screen, select data metastatic marker at configuration data, and presses and hit new transfer button.Data shift and can comprise from remote-control device reading out data, data are write to remote-control device, or both from remote-control device reading out data, also data were write to remote-control device.If selected both to read also and write, first read, and then write.
Read or write shifted word at every turn and mostly be most 100.Can to or from the V memory of local CPU, carry out data transfer.Wizard program can be described the position of memory in remote-control device, just look like remote-control device be that S7-200CPU is the same.When if remote-control device is Modbus device, can to or occupy-place register from Modbus device (address 04xxxx) carry out data transfer.The Modbus address (xxxx) being equal to can determine as follows:
Modbus address=1+(V storage address/2)
V storage address=(Modbus address-1) * 2
The telephone number mark shifting on screen at configuration cpu data allows user to define data transferred directory number between arrive-CPU of CPU – or arrive-Modbus of CPU –.User can press and hit new phone number ... button, to increase new telephone number.Once configure telephone number, just it can be added in scheme.User can be able in the telephone number row for application highlight this telephone number, and presses and hit right arrow box this telephone number is added in current scheme.Once user adds this telephone number in current scheme to, user just can select this telephone number, and increases a symbolic name can to this telephone number, for user program, applies.
Explanation is identical with the explanation previously message being sent with phone number field.If remote-control device is modem module, and has password protection, can require password field.Password field in can local modem module is set to the password of remote modem module.When remote modem module requires password, local modem module can provide this password.
Callback can make the automatic disconnection after receiving from the calling of long-range STEP7-Micro/WIN of EM241 modem module connect, and dials predetermined telephone number.User can select can callback check box, and presses and hit configuration callback ... button, to configure call-back telephone number.
Configuration callback ... screen allows user to key in the telephone number using when EM241 modem module is replied calling.If want to pre-determine ans back, the optional hook of user ' only can callback assigned telephone number '.If EM241 modem module is intended the ans back (for Opposite direction connection charge) that any one origin words people of approval provides, the optional hook of user ' can any one telephone number of callback ' is selected.
If only allow the call-back telephone number of appointment, user can press and hit new phone number button to add call-back telephone number.Callback attribute screen allows user to key in predetermined call-back telephone number and the explanation to this ans back.The ans back of keying in here can be EM241 modem module the adopted telephone number that dials when carrying out callback.Telephone number can comprise connection outside line, and the time-out while waiting outside line connects long-distance etc. desired whole numerals.
After keying in a new call-back telephone number, this number can be added in scheme.User can be able in the call-back telephone number row for application highlight this telephone number, and presses and hit right arrow box this telephone number is added in current scheme.
When sending message or in data transfer process, the number that user can intend to dial to EM241 modem module arranges.In certain embodiments, only have and all do not have when successful when all dialing and the trial that sends message, EM241 modem module just can be to user program reporting errors.
Some telephone wire does not have dialing tone when receiver lifts.When order EM241 modem module sends message or carries out callback, if there is not dialing tone, EM241 modem module can be to user program reporting errors.In order to dial number on the line of dialing tone not having, user can select the check box of hook to be, can dial no dial tone and select.
Modulator-demodulator expansion wizard program can be that EM241 modem module creates configuration block, and requires ，Gai address, address that user keys in start memory for storing the configuration data of EM241 modem module.EM241 modem module configuration block can be stored in the V memory of CPU.STEP7-Micro/WIN can be in this configuration block writing scheme data block.The large I of configuration block changes according to the quantity of message and the telephone number that configures.User can select the address for the V memory of stored configuration piece, or, if user wants the suggestion of this wizard program to have correct size and the address of the V memory do not used, can press and hit suggestion address button.
Last step of configuration EM241 modem module is the address for the Q memory of EM241 modem module specified command byte.The output byte utilizing by calculating any one module with discontinuous output, user can determine Q storage address, these modules are arranged on above the S7-200 before EM241 modem module.
Modulator-demodulator expansion wizard program can produce its scheme part for the configuration (program block and data block) that user selects, and can make these codes can be for user program.Final wizard program screen can demonstrate the part that user asks allocation plan.User can download to EM241 modem module configuration block (data block) and program block in S7-200CPU.
Modulator-demodulator instruction and restriction
Modulator-demodulator expansion wizard program is according to module position and the config option selected by user, and by creating unique instruction subprogram, it is comparatively easy to make the control of EM241 modem module.Each instruction " MODx_ " prefix in addition, wherein x is module position.
The application of EM241 modem module instruction
When your application of modulation demodulator module instruction, please consider following these guilding principles:
(a) instruction of EM241 modem module can be applied three subprograms.
(b) instruction of EM241 modem module can increase the storage total amount of user program requirement, until 370 bytes.
If user has deleted an instruction subprogram of not used, as long as need, user can be reruned modulatedemodulate
Adjust device expansion wizard program to create this instruction.
(c) common, each instruction of only stress living.
(d) common, in interruption routine, application instruction not.
(e) when EM241 modem module is connected with the mains for the first time, and stopping-arriving-move conversion after, this module
Can read configuration form information.In certain embodiments, pattern change or lower secondary source circulation before,
Module be can't see any change that user program is made configuration form.
The application of EM241 modem module instruction
User can add in user's S7-200 program that following steps utilize the instruction of EM241 modem module:
A. utilize modulator-demodulator expansion wizard program to create EM241 modem module configuration form.
B. in program, insert MODx_CNTL instruction, and utilize SM0.0 contact when each scanning, to carry out this instruction.
The message that c. need to send to each is inserted MODx_MSG instruction.
Shift d. to each data and insert MODx_XFR instruction.
The instruction of EM241 modem module
MODx_CNTL instruction
MODx_CNTL(control) instruction can be used for making EM241 modem module can work and initialization.This instruction all can be called when each scanning, in certain embodiments, in scheme, uses once.Fig. 9 is the screen shot that graphical user interface 9000 shows some MODx_CNTL instruction.
MODx_XFR instruction
The transfer of MODx_XFR(data) instruction is used for ordering EM241 modem module reading out data, and data is write to another one S7-200CPU or Modbus device.In certain embodiments, from triggering
startbe input to
completeposition appearance, this instruction will be used 20-30 second.Figure 10 is the screen shot that graphical user interface 10000 shows some MODx_XFR instruction.
eNposition can be in on-state, to say the word to module, and its on-state can remain to always, and expression process completes
completetill position occurs.When
startinput is connected, and module is current is not in a hurry, and when each scanning, an XFR order can be sent to EM241 modem module.
startinput can be by only allowing the rim detection element of an order of transmission by pulse-on.
phonecan be that data shift a number in telephone number.When this number is that while expanding wizard program definition with modulator-demodulator, user can adopt and give the symbolic name that each data shifts telephone number.
datait can be the number during defined data shift.When data transfer request is that while expanding wizard program definition with modulator-demodulator, user can adopt and give the symbolic name that these data shift.
completeto complete when EM241 modem module the position occurring after data shift.
mistakecan be to comprise the byte that data shift result.Table 6 is listed and is carried out the issuable some error situations of this instruction.
Table 6
MODx_MSG instruction
MODx_MSG(sends message) instruction is for sending beep-page message or SMS message from modem module.In certain embodiments, from triggering
startinput time starts, and arrives
completeposition appearance, this instruction will be used 20-30 second.Figure 11 is the screen shot that graphical user interface 11000 shows some MODx_MSG instruction.Table 7 provides the various parameters of MODx_MSG instruction.
Table 7
eNposition can be in on-state, to say the word to module, and its on-state can remain to always, and expression process completes
completetill position occurs.When
startinput is connected, and module is current is not in a hurry, and when each scanning, a MSG order can be sent to EM241 modem module.
startinput can be by only allowing the rim detection element of an order of transmission by pulse-on.
phoneit can be a number in message telephone number.When this number is that while expanding wizard program definition with modulator-demodulator, user can adopt the symbolic name of giving each message telephone number.
messageit can be a number of defined message.When this message is that while expanding wizard program definition with modulator-demodulator, user can adopt the symbolic name of giving this message.
completeto complete when EM241 modem module the position occurring after service provider sends message.
mistakecan be a byte, wherein comprise result from this request to module that send.Table 8 provides the definition of carrying out the issuable some error situations of this instruction.
Table 8
The sample program of EM241 modem module
Table 9 provides a sample program for EM241 modem module.
Table 9
Support each S7-200CPU of intelligent object
EM241 modem module can be a kind of cooperative intelligent expansion module with S7-200CPU that is designed to, as shown in table 10.
Table 10
The private memory location of EM241 modem module
Physical location according to each intelligent object in I/O expansion bus, can give each intelligent object by 50 byte allocation of private memory (SM).When error situation or state variation being detected, module can, corresponding to module position, more be newly arrived and point out this situation SM position.If this is the first module, can be on demand to SMB200 to SMB249 more newly arrive report condition and error message.If this is the second module, can to SMB299, upgrade SMB250, and so on, as shown in table 11.
Table 11
Table 12 is expressed as the private memory data area that EM241 modem module distributes.Can define this region, just look like this region be that to be arranged in the intelligent object of groove 0 of I/O system the same.
Table 12
Additional proposition
Understand configuration form
In order, according to the answer providing about system is produced to configuration form automatically, to expand wizard program to modulator-demodulator and to develop.Configuration form information Shi Wei advanced level user below provides, and these users want to create themselves modem module control routine and their message format.
Configuration form can be arranged in the V memory area of S7-200.As shown in table 13, in table, byte bias hurdle can be the byte bias of the indicated position of configuring area pointer in relative SM memory.Configuration form information can be divided into four parts.
(a) configuration block can comprise the information that configures this module.
(b) call-back telephone number piece can comprise the authorized predetermined telephone number of callback security.
(c) message directory number block can comprise, when dialling the telephone number utilizing when message sends service or cpu data transfer.
(d) message blocks can comprise and pre-determines the message that will send to message to send service.
Table 13
When these events generations below, EM241 modem module can be read configuration form again:
(a) at S7-200CPU, stop at every turn-arrive-move within 5 seconds that change and (remove dec non-modem DEC current online);
(b) every 5 seconds are until find legal configuration (removing dec non-modem DEC current online);
(c) modulator-demodulator is transformed into off-line state from presence at every turn.
Message sends phone number format
The structure of message transmission telephone number comprises EM241 modem module and will send the needed information of message.It can be an ascii string of following ascii character after preamble length byte that message sends telephone number.The maximum length that message sends telephone number is 120 bytes (comprising length byte).
Message sends telephone number can comprise at most 6 fields, mutually by front slash (/) character, is separated.Slash represents a blank (zero) field back-to-back.In EM241 modem module, can be set to damaged value by nil segment.
Form: < phone
Number >/<ID>/LEssT.LT ssT.LT password/< agreement >/< standard >/< form >
The telephone number of being dialled when phone number field can be EM241 modem module transmission message.If the message sending is text or SMS message, this can be service provider's telephone number.If message is digital paging, this field can be the telephone number of beep-pager.If message is cpu data, shift, this can be the telephone number of remote-control device.In this field, maximum number of characters can be 40.
ID can be pager number or cell phone number.This field can only be comprised of digital 0-9.If agreement is cpu data, shift, this field can be used for providing the address of remote-control device.In this field, allow at most 20 characters.
When service provider requires password, password when password field can be used for relying on TAP to send message.For the message that relies on UCP to send, this field can be used as originating address or telephone number.If message is the cpu data transfer to another modem module, this field can be used for providing the password of remote modem module.Password length can arrive at most 15 characters.
Protocol fields can be comprised of an ascii character, and this character explanation EM241 modem module is layout message format and transmit message how.Value is below permissible value:
(a) digital paging agreement (damaged)
（b）TAP
(c) UCP order 1
(d) UCP order 30
(e) UCP order 51
(f) cpu data shifts
Criteria field can force EM241 modem module to adopt the modem standard of appointment.This criteria field can be an ascii character.Value is below permissible value:
（a）Bell103
（b）Bell212
（c）V.21
（d）V.22
(e) V.22 position
（f）V.23c
（g）V.32
(h) V.32 position
(i) V.34(damaged)
Format fields can be 3 ascii characters, number and the parity check of the data bit that their explanations will adopt when transmitting message.If agreement is set to digital paging, can not need to apply this field.In certain embodiments, only allow two kinds of settings below:
(a) 8 data bit of 8N1 –, no parity, a position of rest (damaged)
(b) 7 data bit of 7E1 –, even parity check, a position of rest
Text message format
Text message format can define the form of text paging or SMS message.These type of messages can comprise the variable of text and embedding.Text message can be an ascii string of following ascii character after a preamble length byte.The maximum length of text message can be 120 bytes (comprising length byte).
(a) form: < text >< variable >< text >< variable >
The text field can be comprised of ascii character.
The embedding data value that variable field can read from local CPU EM241 modem module defines, formatting, and they are inserted in message.Beginning and the end of a variable field of available percentage (%) character marking.Address and left field can separate with a colon.The delimiter of left field and right field can be a fullstop, or a comma, and can be used as formaing the decimal point of variable.The grammer of variable field is:
(a) % address a: left side. right form %
Address field is location accountably, the size of data type and embedding data value (being VD100, VM50, MB20 or T10).Data type below allows: I, Q, M, S, SM, V, T, C and AI.Byte, the size of word and double word all allows.
Left field definable shows the number of decimal point left side numeral.This value can be enough large to can process, and during as needs, comprises the expectation scope of the embedding variable of negative sign.If the left side is 0, available leading 0 shows this value.The legal range on the left side is 0 – 10.
Right field definable shows the number of decimal point the right numeral.In certain embodiments, 0 of decimal point the right show always.If the right is 0, while showing this numeral, can not want decimal point.The legal range on the right is 0 – 10.
Format fields can illustrate the display format of embedding value.In format fields, allow following character:
(a) i – signed integer
(b) u – signed integer not
(c) h – hexadecimal
(d) f – floating-point/real number
Example: " temperature=%VW100:3.1i% pressure=%VD200:4.3f% "
Cpu data Transfer Message form
Cpu data shifts, and no matter is the data transfer of arrive-Modbus of arrive-CPU of CPU-or CPU-, can be explained with cpu data Transfer Message form.Cpu data Transfer Message can be an ascii string, and it can illustrate any number that data shift between device, and the number of explanation can arrive maximum message length at most, for example, and 120 bytes (119 characters add a length byte).An available ASCII space separates data transfer instruction, but and does not require.All data transfer instructions can be carried out within once connecting.Can perform a data-transfer operation according to defined order in message.If a mistake detected in data shift, can be terminated to the connection of remote-control device, processing in succession is also just no longer carried out.
It is to read that vacation operates as described, and the number of words of reading from remote-control device can be counted from long-range _ address, then, from locality _ address, they is write in the V memory of local CPU.
It is to write that vacation operates as described, and the number of words of reading from local CPU can be counted from locality _ address, then, from long-range _ address, they is write to remote-control device.
(a) form: < operation >=< calculates >, < locality _ address >, and < is long-range _ address >
Operation field can be comprised of an ascii character, and can define transfering type:
(a) R – is from remote-control device read data
(b) W – writes remote-control device by data
Calculated field can be specified the number of words that will shift.The legal range of calculated field is 1-100 word.
Locality _ address field can be specified the address (being VW100) of the V memory shifting for data in local CPU.
The address (being VW500) that long-range _ address field shifts for data in can assigning remote device.Even to Modbus transferring data, also can specify this address is the address of V memory.If remote-control device is Modbus device, the conversion between V storage address and Modbus address is as follows:
(a) Modbus address=1+(V memory/2)
(b) V storage address=(Modbus address-1) * 2
Example: R=20, VW100, VW200W=50, VW500, VW1000R=100, VW1000, VW2000
Although what the description that the present invention is carried out was relevant is its some specific embodiments, is appreciated that a lot of changes, the embodiment of revising and separately adding is all fine, and accordingly, all these will be changed, revise, and embodiment is all regarded as within the spirit and scope of the present invention.For example, although a certain particular utilization is telephone network, utilize other communication network, such as the Internet, also within the spirit and scope of the present invention.Also have, as what fully announce here, some references of clearly specifying here and discuss are incorporated herein by reference.So, will think that accompanying drawing and description are here illustrative, and can not regard as restriction.
Claims (22)
1. a method, comprising:
Becoming whole modulator-demodulator place reception connection request with programmable logic controller, wherein said modulator-demodulator is connected with the primary processor of this programmable logic controller by expansion input/output bus, and this connection request comprises password;
Contrast the password list comprising in the memory of processor of this programmable logic controller and verify this password;
From the memory of the processor of this programmable logic controller, obtain a call-back telephone number;
Connect with this call-back telephone number; And
Allow by this programmable logic controller of described modem access.
2. a method, comprising:
Becoming whole modulator-demodulator place reception connection request with programmable logic controller, wherein said modulator-demodulator is connected with the primary processor of this programmable logic controller by expansion input/output bus, and this connection request comprises password;
Contrast the password list comprising in the memory of processor of this programmable logic controller and verify this password; And
Allow by this programmable logic controller of described modem access.
3. a method, comprising:
Becoming whole modulator-demodulator place reception connection request with programmable logic controller, wherein said modulator-demodulator is connected with the primary processor of this programmable logic controller by expansion input/output bus; And
Allow by this programmable logic controller of described modem access.
4. the method for claim 3, further comprises with a calling device and connecting.
5. the method for claim 3, further comprises by the Internet and a calling device and connecting.
6. the method for claim 3, further comprises request user name.
7. the method for claim 3, further comprises request password.
8. the method for claim 3, further comprises reception user name.
9. the method for claim 3, further comprises reception password.
10. the method for claim 3, further comprises that the password list of contrast storage is checked the password receiving.
The method of 11. claims 3, further comprises that the user name to receiving is verified with the password receiving.
The method of 12. claims 3, further comprises that the password to receiving is verified.
The method of 13. claims 3, further comprises that the password to having verified is approved.
The method of 14. claims 3, further comprises the ans back receiving from calling device.
The method of 15. claims 3, further comprises and from memory, obtains ans back.
The method of 16. claims 3, further comprises the ans back of the ans back receiving and storage is compared.
The method of 17. claims 3, further comprises a preprogram ans back is started and called out.
The method of 18. claims 3, further comprises an ans back receiving is started and called out.
19. 1 kinds of systems, comprising:
Becoming with programmable logic controller the device that whole modulator-demodulator place receives connection request, wherein said modulator-demodulator is connected with the primary processor of this programmable logic controller by expansion input/output bus; With
Allow by the device of described this programmable logic controller of modem access.
20. 1 kinds of methods, comprising:
Between calling device and modulator-demodulator, connect, this modulator-demodulator and programmable logic controller are become integral body, and wherein said modulator-demodulator is connected with the primary processor of this programmable logic controller by expansion input/output bus; With
Allow this calling device by first modem access the first programmable logic controller.
21. 1 kinds of methods, comprising:
By communication network, modulator-demodulator is connected, this modulator-demodulator and programmable logic controller are become integral body, and wherein said modulator-demodulator is connected with the primary processor of this programmable logic controller by expansion input/output bus; With
By this modem access programmable logic controller.
The method of 22. claims 21, further comprises to this modulator-demodulator password is provided.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34138401P | 2001-12-18 | 2001-12-18 | |
| US60/341384 | 2001-12-18 | ||
| US10/272,114 US7227939B2 (en) | 2001-12-18 | 2002-10-16 | Security features for an integral PLC modem |
| US10/272114 | 2002-10-16 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02828053 Division CN1620792A (en) | 2001-12-18 | 2002-12-04 | Security features for an integral PLC modem |
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| Publication Number | Publication Date |
|---|---|
| CN103546460A true CN103546460A (en) | 2014-01-29 |
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ID=26955306
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02828053 Pending CN1620792A (en) | 2001-12-18 | 2002-12-04 | Security features for an integral PLC modem |
| CN201310451778.XA Pending CN103546460A (en) | 2001-12-18 | 2002-12-04 | Security features for an integral plc modem |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02828053 Pending CN1620792A (en) | 2001-12-18 | 2002-12-04 | Security features for an integral PLC modem |
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| Country | Link |
|---|---|
| EP (1) | EP1457020A1 (en) |
| CN (2) | CN1620792A (en) |
| WO (1) | WO2003053025A1 (en) |
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| CN105740676A (en) * | 2016-02-03 | 2016-07-06 | 四川英杰电气股份有限公司 | Unlocking method and device based on PLC |
| US20180351952A1 (en) * | 2017-06-02 | 2018-12-06 | Schlumberger Technology Corporation | System and method for secure management of network devices |
| US11021944B2 (en) | 2017-06-13 | 2021-06-01 | Schlumberger Technology Corporation | Well construction communication and control |
| US11143010B2 (en) | 2017-06-13 | 2021-10-12 | Schlumberger Technology Corporation | Well construction communication and control |
| CN111277548A (en) * | 2018-12-05 | 2020-06-12 | 陕西思科锐迪网络安全技术有限责任公司 | Method for monitoring Siemens S7-PLC to set session password |
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| WO2000055697A1 (en) * | 1999-03-15 | 2000-09-21 | Siemens Energy & Automation, Inc. | Programmable logic controller with short duration pulses detection capability |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8905044D0 (en) * | 1989-03-06 | 1989-04-19 | Ellis Chris K | Security device to limit remote access to computer over a telecommunication network |
-
2002
- 2002-12-04 CN CN 02828053 patent/CN1620792A/en active Pending
- 2002-12-04 CN CN201310451778.XA patent/CN103546460A/en active Pending
- 2002-12-04 WO PCT/US2002/038621 patent/WO2003053025A1/en active Application Filing
- 2002-12-04 EP EP02797175A patent/EP1457020A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2168831A (en) * | 1984-11-13 | 1986-06-25 | Steebek Systems Ltd | Password-protected data link |
| WO2000055697A1 (en) * | 1999-03-15 | 2000-09-21 | Siemens Energy & Automation, Inc. | Programmable logic controller with short duration pulses detection capability |
| US20010037491A1 (en) * | 1999-03-30 | 2001-11-01 | Siemens Aktiengesellschaft | Programmable logic controller method, system and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1457020A1 (en) | 2004-09-15 |
| WO2003053025A1 (en) | 2003-06-26 |
| CN1620792A (en) | 2005-05-25 |
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Application publication date: 20140129 |