Process of field instrument control (variants)

FIELD: physics.

SUBSTANCE: field instrument is connected to a control unit via a data bus, the control unit requests personal identifier of the field instrument periodically, and compares it to the stored identifier, and if the identifier differs an alarm or warning message is issued, and the requested identifier is saved to the databank with a timing mark.

EFFECT: eliminates unauthorised manipulation of field instruments.

11 cl, 1 dwg

 

The invention relates to a method of controlling the field device (options).

In automation engineering processes use a variety of field devices, which are used for measuring and/or impact on the variables of the process. Examples of such field devices are devices for measuring the filling level, instruments for measuring mass flow, pressure and temperature, devices for the measurement of pH reduction and oxidation, instruments for measuring bandwidth, etc. that as sensors measure the relevant variables of the process, such as filling level, flow, pressure, temperature, pH or the conductivity value.

Along with such measuring devices are also known systems, which along with the dimension of the measured values also perform other tasks, it is necessary to call the cleaning system of electrodes, system calibration, and samplers.

To influence the process parameters are the so-called actuators, such as valves that control the passage of fluid in a section of piping, or pumps, which affect the level of the tank.

Many of these field devices manufactures and sells the firm Endress + Hauser®.

Often the field devices in modern production at the installations are connected through the system field bus (Profibus® , Foundation® Fieldbus, HART® etc) with the upstream blocks, for example with process control systems or control units. These higher-level blocks are used for process control, visual process, control process, as well as for maintenance and control of field devices.

From the above blocks is also possible communication connections with other networks of the company.

For servicing field devices requires appropriate maintenance program (maintenance tools) in the control system, respectively, in a control block. These maintenance programs can be run independently or can be integrated into the application software of the control system.

The sensors supply the values of the dimension that correspond to the measured process parameters. These measurement values are transmitted to the control unit, for example, (SPS control with programmable memory).

Generally, the process control is carried out by means of the control unit, where the measured values of the measurement of various field devices and based on the evaluation of generated control signals to the respective actuators. Along with the transmission of the measurement values of the field devices can transmit additional information (diagnostics, status, and so on). PA is Ameritania and configuration of field devices is also carried out through the system field bus.

System field bus is also called the system control process.

Safety requirements for systems and control processes are becoming more stringent. Therefore, in many companies the system monitoring process is strictly separated from the networks of firms (SAP, Business). Due to this, should be excluded unauthorized access to field devices. Currently focusing efforts on security in systems and control processes at the level of networks.

To prevent unauthorized interference with other companies use the so-called firewalls. However, along with the intervention of other companies are also dangerous unauthorized intervention within the firm. Interference within the firm can be, for example, changed the parameters of the field devices or change the entire strategy of control. This can lead to undesirable changes in the production process.

The control strategy can be created, for example, using FieldCare system® firm Endress + Hauser and download in the field devices.

Programs that provide parameterization, configuration and change control strategy (SCADA systems or Configurations Tools), usually provided with protection in the form of a password. This is also necessary to authorize personnel to perform like the of changes.

For example, in the system control process Centum CS 1000 company Yokogawa critical functional blocks that are executed, for example, field devices, can be changed only when you enter the two passwords are different persons.

The firm Endress + Hauser has provides security protection against unauthorized changes of parameters of field devices using a lock. A person who wishes to perform the change must be entered in field device code to the possible changes in the field device.

Field devices used in the systems of monitoring process are usually microprocessors with related peripheral modules.

Therefore, it is possible that hardware or software or other part in a field device can be abusive replaced, changed accordingly. Such manipulation cannot be detected in the process control system. However, they imply a significant intervention in the course of the process, respectively, the control strategy.

In particular, also for legal reasons, the regulations for the owner of the equipment, it is important to ensure the progress of the process without the danger of manipulation.

Therefore, the objective of the invention is to provide a method of controlling the field devices, which is prevents unauthorized manipulation of the field instruments.

This problem is solved by the characteristics specified in paragraph 1 of the claims. Preferred modifications of the invention are specified in dependent claims.

The essential idea of the invention is that the control block via the Fieldbus is connected with the field device, with time intervals requests a unique ID field of the device and compares it with stored in a control block identifier. Due to this request immediately found the replacement hardware, respectively, of the software or parts thereof. In particular, the method according to the invention is essential for the recognition of the validity of the installation.

In the simplest case, the unique ID may be a serial number field of the device.

In an alternative embodiment, a unique identifier may be a key brand in the software of the field device.

As an individual identifier can be stored in the field device checksum of the memory block.

To ensure reliable logging setup on every request the requested ID to save in the database with the corresponding timestamp.

Save the ID in the database is feasible, what about the only when set to modify the ID.

Because the manipulation with the field unit must immediately inform the service personnel, upon detection of the change of the identifier of the field device generates an alarm message or a warning message.

Because at the field device, you must also perform work-related change messages alarm or other actions are created only when they are outside of the specified time periods of maintenance.

Below is a detailed description of the invention with reference to the accompanying drawing, which shows an example of executing a network diagram technique the automation of processes.

Network diagram technique the automation of processes shown in detail. Bus D1 data connected to multiple control systems, respectively control units (workstations WS1, WS2), which are used for process visualization, monitoring and technical support. Bus D1 data transfer works in accordance, for example, with standard HSE (high speed Ethernet network) Foundation® Fieldbus. Via a gateway G1, which is also called a coupler, bus D1 data connected with segment SM1 Fieldbus. Segment SM1 Fieldbus consists of several field instruments Fl, F2, F3, F4, is the quiet via the Fieldbus FB are connected to each other. Field bus works, for example, in accordance with standard Foundation® Fieldbus.

Below is a detailed description of the method according to the invention.

The control unit WS1 queries with time intervals of the individual identifier of the field device, for example F1. Upon request, the field device F1 transmits its unique ID to the control unit WS1. In the control unit WS1, this unique identifier is compared to the stored in the control unit WS1 individual identifier. If the passed field device unique ID matches stored in a control block individual ID, it is established that in a field device is not performed unauthorized manipulation in relation to hardware, respectively software. Due to this possible verification process.

As an individual identifier, you can use the serial number of the field device F1, respectively, the key is in the software of the device. The control unit WS1 is connected with an external database, in which each request is logged with a timestamp. Due to this, it is possible to prove for a long period of time.

In an alternative embodiment, a saving in the Bank the data do then, when the control unit WS1 set identifier change.

As a rule, maintenance of automation equipment perform in exactly the specified time periods. To eliminate unnecessary messages alarm they are created only when they are outside of the specified time intervals maintenance.

An alarm message can be displayed in the control unit WS1 or passing on alternative ways, for example through e-mail, short message service and Fax, to the competent authorities.

In a very simple embodiment of the control unit only control whether the corresponding field device, such as F1, with field bus FB and able to perform its function.

For this purpose, the control unit WS1 sends to the field device F1 request that requires a response field device F1. If the field device does not respond, then the database stores information about the failure.

1. Method of controlling the field device to unauthorized manipulation of this device over the data bus is connected with the control unit, wherein the control unit with time intervals requests a unique ID field of the device and compares it with stored in a control block identifier d is I the establishment of unauthorized manipulation with the field device, and when you change the ID to create an alarm message or a warning message.

2. The method according to claim 1, characterized in that an alarm message or warning message only create when they are outside of the specified time periods of maintenance.

3. The method according to claim 2, characterized in that an alarm message or a warning message displays in the control block.

4. The method according to claim 3, characterized in that an alarm message or a warning message is passed electronically (e.g. e-mail, SMS or Fax).

5. The method according to claim 3, wherein the message is an alarm or alert message can be called from the control unit.

6. The method according to claim 4, wherein the message is an alarm or alert message may be called by the client (for example, Internet Explorer).

7. Method of controlling the field device to unauthorized manipulation of this device over the data bus is connected with the control unit, wherein the control unit with time intervals requests a unique ID field of the device and compares it with stored in a control block identifier to establish unauthorized manipulation with the field device, and the requested ID is notificator save in the database with a timestamp.

8. The method according to claim 7, characterized in that the saving in the data Bank are used only when installing the change of the identifier.

9. The method according to claim 1, wherein the unique identifier is a serial number field of the device.

10. The method according to claim 1, wherein the unique identifier is a key brand in the software of the field device.

11. The method according to claim 10, wherein the unique identifier is a checksum of the memory block in a field device.



 

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