DE2152915A1 - PROCEDURE AND EQUIPMENT FOR SECURE REMOTE DATA TRANSFER IN EQUIPMENT FOR MONITORING PRODUCTION PLANTS WITH THE HELP OF DATA PROCESSING SYSTEMS - Google Patents

Description

Method and device for secure remote data transmission in Devices for monitoring production plants with the aid of data processing systems.

The invention relates to a method for secure remote data transmission in facilities for monitoring production systems with a central, one Computer containing data processing system, which by means of a signal word status data individual units of a manufacturing plant via this assigned control devices from asks and to these commands for direct or indirect intervention in the manufacturing process outputs this status data with previous and / or stored target data compares and based on the result of this comparison a signal for Influencing of the individual units of the manufacturing facilities; also refers to Invention to a device for carrying out the method.

For monitoring production or work processes on production systems is it e.g. known from DOS 1 909 455, on each individual unit of the production systems Provide control devices that are constantly connected to the central data processing system These provide information about the process running on this production unit are stored in the central data processing system with a previously saved Compared program that defines the target sequence of the manufacturing process; Right the information sent out by the control devices no longer corresponds to the in the data processing system programmed matches, it then sends this to the production unit a signal e.g.

leads to the shutdown of the production unit or an operator Provides information about necessary interventions in the manufacturing process.

It is also known from DOS 1 901 905 after the comparison that sent by the control devices to the central data processing system Information with the information stored there if they do not match This two pieces of information send a correction command directly to the production unit to send. In this way the manufacturing process is further automated the installation sites of such manufacturing plants are often extreme environmental conditions prevail, for example high or extremely fluctuating temperatures and aggressive atmosphere or electrical tmd magnetic interference fields through which the mostly clock-controlled and digitally working data processing systems the often very long data transmission lines very easily miss pulses fed it is particularly important to take suitable measures for secure remote data transmission to take in order to achieve a possible economic use of the production facilities and to achieve a high level of operational reliability.

The known method for monitoring production systems is However, it is difficult, for example, on the transmission path between the data processing system and the control devices or in them themselves, e.g.

by the above conditions; to quickly localize the error caused, or determine whether this error - caused by the extreme environmental conditions - is only a short-term disruption. In case this misinformation is not detected the further course of the manufacturing process is based, this will be this way disturbed that the production facilities due to the resulting downtime not used optimally. Likewise, due to the lack of transmission security often errors that actually exist in the production process do not exist either recognized quickly enough.

This is where the invention comes into play, the object of which is to provide a method for secure data transmission in facilities for monitoring production plants to create any errors in the transmission path or in the Control devices quickly localized thanks to a new type of data transmission and can be eliminated with little effort.

This task is for a method for secure remote data transmission in facilities for monitoring production plants with at least one central, a computer containing data processing system, which by means of a signal word Status data of individual units of the finished plant via assigned control devices queries and to these commands for direct or indirect intervention in the manufacturing process outputs this status data with previous and / or compares stored target data and based on the result of this comparison derives a signal to influence the individual units of the production systems, solved in that, in addition, the signal word sent to the control device after being taken over by the control facilities, at least partially to the central data processing system sent back and here with the sent is compared.

Should, for example, after one such, preferably several times The comparison carried out shows that on the data path between the central Data processing system and one of the control devices has an error is, it is possible to use the control device and, if necessary, the electrical Exchange connections from this to the data processing system without the data traffic to interrupt between the data processing system and the other control devices. But even short-term disruptions are caused by the repeated query of the first Signals recognized quickly; so are sent out by the control devices and Information incorrectly received by the data processing system due to a fault not processed further and can therefore not have an uneconomical effect of the manufacturing process.

A device for carrying out the procedure with a central Data processing system that has a clock-controlled sequence control, several one each Control device assigned information sender and information receiver and a device for comparing the transmitted and received information has, the control devices provided on individual units of the production systems each connected to an information sender and receiver are and after addressing by the central data processing system by means of a Signal word information about the actual status of the individual units to the data processing system and provide information about a direct or indirect intervention in the manufacturing process obtained is characterized in that the control devices each have a register to take over the signal word, its content at least partially after Transfer to this register by the information recipients of the central data processing system Is communicable.

According to the invention, the control devices do not only transmit the information about the states of the production units to the central data processing system, but also the signal word that triggers this information; this signal word is thus used at the same time to check what is present in the control devices electronic components used, so that a fault in this or in the transmission path is detected directly from the central data processing system and leads to the transmission of an error signal, e.g. a warning signal.

It is particularly favorable if this automatic sequence of multiple checking of the data path not by the central data processing system itself, but carried out automatically in their periphery with the aid of a comparator will. During the review, the data processing system is available to others Work available.

An embodiment in which the transmitted signal words are completely are sent back to the data processing system, is characterized by that the control device has an information register with its parallel outputs has associated shift register, the parallel inputs of which with a state the manufacturing unit containing Memory and its series output is connected to the information receiver of the data processing system.

Another embodiment of the invention that is exclusively clock-controlled works and in which only part of the first information is sent to the data processing system is returned, is characterized in that the control device a running synchronously with a counter provided in the data processing system Counter and an information register for taking over the respective counter reading its coincidence with the signal word provided in the data processing system has, and that the output of the information register with devices for influencing of the production systems and at the same time as that provided in the data processing system Information receiver is electrically connected, The invention is in two embodiments explained in more detail with reference to the drawing. In detail: FIG. 1 shows a block diagram a device for monitoring production plants according to the invention in one first embodiment; Figure 2 is a block diagram of a second embodiment game of invention.

A computer lol is in a central data processing system 1 with a program memory for a manufacturing process or for greater operational reliability two computers are provided in a coincidence circuit so that if one computer fails the other takes over his work. An address register is connected to the computer lol 102 as well as a transmission periphery 1o5 with a sequence control and a Verglclehl; .circuit10) 1. Address register 102 and transfer peripherals 1o5 are at the same time, each time with a beat> .sender lo, information channels 105 and information receivers 106 connected.

The outputs of each clock transmitter 104, information transmitter 105 and information receiver 1o6 are in a corresponding assignment in three pairs of wires 107, 108 and lo9, which in are combined in a cable, each connected to a control device 2, which is set up at the location of a manufacturing unit 3 of a manufacturing plant. the individual clock transmitter, information transmitter and information receiver shown in the figure 1 are each combined in a single block are stored in the address register 102 controlled via an address decoder and switch the Ubertragungsperi pherie 103 of the many, star-shaped with the central data processing system 1 over cables indicated by the arrows at 105, 1o6 and 107, connected control devices only one addressed control device 2 in each case.

In the control device 2 is a cable receiver 201 or 202 with the wire pair originating from the clock and information transmitter 104 or 105 107 or 108 connected. The cable receivers 201 and 202 are control electronics 20) are connected downstream, which in turn have a shift register 204 and a parallel-connected Information register 205 controls. The output of the shift register 204 is with a cable transmitter 206 connected, which in turn via the third pair of wires 109 with the information receiver 106 in the central data processing system 1 is connected is. Furthermore, a display board 207 is provided on the control device 2, on that of an operator of the production system 3 from the central data processing system 1 sent out information from the information register 205, e.g.

electrical, acoustic signals or optical signals can be identified made will. Of course, this information can be transmitted with the signal word also serve directly to intervene in the manufacturing process of the manufacturing unit. above a cable 51 are still the respective states of the manufacturing plant 3 in a Memory 208 of the control device 2 entered, in which the operator Store further states manually, for example using keys on the display panel 207 can.

The device works as follows: After addressing a control device 2 through the address register 102 of the central data processing system 1 the sequence of the data traffic is controlled by the sequence control in the transmission peripherals 103 controlled in three phases by means of four time-shifted clock pulses. The first Clock T1 identifies the rest position and is only used for definition, clock T2 is sent via the clock transmitter 104 to the control device, the clock is 5 a transmission shift clock in the transmission peripherals of the central data processing system 1 and the clock T4 a receive shift clock in the transmission periphery loS.

In the first phase, the computer uses a command word in the Sequence control of the transmission peripherals 103 the mode output "marked and a Start command given.

During this first output, the receive shift clock T4 is in the Transfer peripherals blocked. At the same time the sequence control is reset, which is then provided by the computer lol, e.g. information as defined above for the operator containing n-bit wide signal word takes over. The signal word In addition to the electrical, optical ones appearing on the display panel 207 or acoustic signals or word selection commands to query the state of the Manufacturing unit 5 descriptive information. During the first series of impulses T1 to T4 becomes the Control device 2 reset and open Reception switched. In the course of the next n series of pulses, the entire from Computer lol output signal word from the information transmitter 105 into the shift register 204 of the control device 2 transferred. The one in the control device 2 in the shift register Information written in 204 is entered into the information register via the n parallel outputs 205 taken over; at the same time the control electronics 20) are reset. After the end During the first phase, the "Input I" mode is automatically switched in the sequence control and a new start command is triggered. In the now beginning second phase of the Data traffic is the send shift clock T5 in the transmission peripherals 103 and thus the output of the information transmitter 105 is blocked. During the first series of impulses T1 to T4 the control device is switched to "send" by the clock pulse T2, and by a further n clock pulses T2 the entire information content of the shift register 204 of the control device, that is, the signal word sent out first, via the transmitter 206 and the pair of wires 109 to the information receiver 1o6 in the central data processing system 1 sent back and there in the comparator circuit 103 with the receive shift clock T4 and compared with the signal word provided in the first phase. If there is no coincidence an error interrupt is given to the computer lol.

That stored in the information register 205 of the control device 2 On the one hand, the signal word is used to control the signals on the display board 207, on the other hand to a decoder 209, which stores the data in the memory 208 attached information about the states of the production plant 5 for takeover into the shift register 204 via which enables the parallel inputs. Also will if the control electronics 2o5 are reset.

However, if the comparator 104 does not match between the transmitted and received signal word, the control device 2 from the central data processing system 1 a second and possibly one addressed third time. If no match is found afterwards, so the data connection to the respective control device 2 is reported as defective.

The cable consisting of the three wire pairs 107 to 1o9 and if necessary the corresponding control device 2 can then be exchanged 0 This can communicate with other control devices without interrupting the rest of the data traffic thanks to the star-shaped cabling of the control devices with the data processing system 2 just happened. In the case of only brief disturbances, a repeated Checking the received and sent signal word after comparing it several times turn out positive again and a replacement of the cable and the control device make superfluous. This way there is an optimal efficiency of the manufacturing process to reach.

The electronic effort for the control device 2 is low. If an 8-bit-wide signal is used as a basis, then there is only an 8-bit-wide shift register 204 and on off depending on the amount of information you want on the billboard 207 and the number of word choices, information registers containing multiple flip-flops 205, as well as a decoder 209 built up from individual NAND stages for the word atlswatll necessary. The decoder can also, especially if a larger number of states the individual production units should be queried in integrated circuit technology be constructed. It is also possible to cite control direction 2 without change in the transfer periphery 103 cells, e.g. through additionally built-in ; £ Love and information registers lin (l associated decoders.

In a second embodiment of the invention cf.

FIG. 2 are the same for the same components from FIG. 1 Reference numbers are used. The central data processing system 1 consists of one Computer lol or two computers connected in coincidence, an address register 102 and a transmission periphery 105 with the associated sequence control.

The central data processing system 1 is three in one cable combined wire pairs 107, 1o8 and 1o9 connected to the control device 2, which monitors the operating state of the manufacturing unit 3 and, if necessary, independently or can be regulated by informing an operator.

In contrast to the control device of the first embodiment this monitoring system works purely clock-controlled.

A clock generator 111 is provided in the transmission peripherals 105, which supplies four time-shifted clock pulses T1 to T4. The clock pulse T1 is used while the definition of the rest position, with the clock pulse T2 the control device 2 controlled. The central data processing system sends at the clock pulse T3 a signal word to the control device 2 and with the clock pulse T4 are the Information supplied by the control device 2 to an information receiver 106 transferred to a receive shift register 112 of the transmission peripherals.

The data traffic between the central data processing system 1 and the control device 2 takes place in this embodiment in one phase. For the sake of clarity, however, the data traffic should be divided into two sections - File input or data output at the control device - are described, which, however, are actually nested within one another in time are.

A counter 113 is provided in the transmission peripherals 105, which e.g. designed as a 4-bit counter. The counter 115 cycles through all sixteen Combinations; Such a counter 2041 is for him in the control device 2 assigned with a downstream 16-bit multiplexer 2042.

The clock pulse T2 in the transmission peripherals to the counter 115 and via a clock transmitter 104 the wire pair 1o7 and the cable receiver 201 to the counter 2041 in the control device 2 supplied. This counter controls the 1O-bit multiplexer via its 4 binary outputs 2042. The counter 2041 and the multiplexer 2042 correspond in this exemplary embodiment the shift register 204 of the first embodiment. When the clock generator 111 in the transmission peripherals 103 sixteen times the series of pulses given above T1 to T4 passes through, those present at the 16 inputs of the multiplexer 2042 will be Signals interrogated one after the other and via a transmitter 206 and the pair of wires 109 to Information receiver 106 is transmitted, from where it is transferred to the receive shift register with the clock pulse T4 112 of the transmission peripherals 105 are taken over. At the end of the 16 series of impulses the sequence control stops and sends a ready signal to the computer.

For the data output it is assumed that the one supplied by the computer lol Signal word is e.g. 8-bit wide. In the control device 2 is an information register 205 provided, which consists of four register flip-flops. The signal word contains iii bits 1 to 4, the information that is stored in the first and second register flip-flops, in bits 5 to 8 the one Information included in the third and fourth register flip-flop is to be enrolled. If the counter 113 runs through its Sixteen possible combinations, so each combination is in a comparator 114 compared with the first or second four bits of the signal word. Is one true this counter combinations with the specified partial information about a so is with the clock pulse T5 via a transmitter 105 via the wire pair 108 and the Cable receiver 202 controls the control electronics 203 of the control device 2. The counter 2041, which runs synchronously with the counter 115, thus becomes its first two bits are transferred to the information register 205. To control the transmitter 105 and for the selection in which part of the information register 205 this partial information is stored out, the third or fourth bit of this piece of information is used in each case. To ensure the synchronous operation of the counters 115 and 2041, as well as the cable connection between the central data processing system 1 and the control device 2 and the function to check the control device 2, the four outputs of the four register flip-flops fed back to the last four inputs of the multiplexer 2042 and, as above described, sent back to the calculator lol for review.

The remaining inputs of the multiplexer are partly connected to the ready-made system 3 via a cable 31 or with a state of the finishing unit 7 also representing, Connect buttons to be operated by the operator on a display panel 20 { luld are also constantly queried by the data processing system and sent back to them.

It goes without saying that by expanding the multiplexer and the Counters 113 and 2041 possible to process more complex information or, as in first embodiment described by adding a decoder allch Select several five criteria about the state of the manufacturing locations.

In contrast to the first embodiment, is described in the monitoring system not the entire signal word, in this case 8 bits wide, but rather only the four-digit output signal present at the information register 205 sent back to the central data processing system. This returned information is therefore only a so-called partial echo of the first signal word in contrast to the Full echo of the first embodiment.

Patent claims:

Claims (4)

Patent claims oil method for secure remote data transmission in facilities for monitoring production systems with a central, one Computer 'containing data processing system, which by means of a signal word status data individual units of the production plant via assigned control devices from asks and to these commands for direct or indirect intervention in the manufacturing process outputs this status data with previous and / or stored target information compares and based on the result of this comparison a signal for influencing derives from the individual units of the production facilities, thus g e n n e c e i c h n e t that, in addition, the signal word sent to the control devices (2) after being taken over by the control devices (2), at least partially sent back to the central data processing system (1) and here with the sent will be compared 2. Device for secure remote data transmission in facilities for monitoring production systems for carrying out the method according to claim 1, with a central data processing system that has a clock-controlled sequence control, several information transmitters and information receivers each assigned to a control device and means for comparing the transmitted and received information having, with those at the individual units of the manufacturing facilities provided control facilities, each with an information sender and receiver are connected and after addressing by the central, a computer having Data processing system by means of a signal word information about the current state of the individual units provides and information about an indirect or immediate Intervention in the manufacturing process received, thereby g e k e n n -z e i c h n e t that the control devices (2) each have a register (204,205; 2041,2042,205) for acceptance of the signal word, the content of which is at least partially after acceptance in this register the information receivers (106) of the central data processing system (1) can be transmitted. 5. Device according to claim 2, characterized in that g e k e n n -z e i c h n e t that the control device (2) has an information register with its parallel outputs (205) has associated shift register (204), the parallel inputs of which with a the state of the production systems (3) containing memory (208, 209) and its Series output with the information receiver (1o6) of the data processing system (1) connected is. 4. Device according to claim 2, characterized in that g e k e n n -z e i c il n e t> that the control device (2) one with one in the data processing system (1) provided counter (113) synchronously running counter (2041) and ehl information register (205) to take over the respective LFeri counter reading when it coincides with the in the data processing system (1) has provided first information, and that the output of the information register (205) with means for influencing of the production systems (207) and simultaneously with that in the data processing system (1) provided information receiver (106) is electrically connected.