WO2018028978A1

WO2018028978A1 - System and method for activating a radio interface of a field device for process automation

Info

Publication number: WO2018028978A1
Application number: PCT/EP2017/068705
Authority: WO
Inventors: Ralf Schmidt; Björn HAASE; Markus Kilian; Helmut Kalteis
Original assignee: Endress+Hauser Gmbh+Co. Kg
Priority date: 2016-08-12
Filing date: 2017-07-25
Publication date: 2018-02-15
Also published as: DE102016115005A1

Abstract

The invention relates to a system and a method for activating a radio interface (FS) of a field device (F) for process automation, comprising: - a release unit (FE); and - the field device (F) which comprises a detection unit (DE) for detecting the release unit (FE) and the radio interface (FS), wherein the release unit (FE) is arranged on the field device (F), and wherein the radio interface (FS) is activated after the detection unit (DE) has successfully detected the release unit (FE).

Description

System and method for activating a radio interface of a field device of process automation

The invention relates to a system for activating a radio interface of a

Field device of process automation. Furthermore, the invention relates to a

Method for activating a radio interface of a field device of

Process automation.

Field devices are already known from the prior art, which are used in industrial plants. Field devices are often used in process automation technology as well as in factory automation technology. In principle, field devices are all devices that are used close to the process and that provide or process process-relevant information. For example, field devices are used to detect and / or influence process variables. Measuring devices or sensors are used to record process variables. These are used, for example, for measuring pressure and temperature.

Conductivity measurement, flow measurement, pH measurement, level measurement, etc. used and recorded the corresponding process variables pressure, temperature, conductivity, pH, level, flow, etc. Actuators are used to influence process variables. These are, for example, pumps or valves that can influence the flow of a liquid in a pipe or the level in a container. In addition to the measuring devices and actuators mentioned above, field devices are also understood as remote I / Os, radio adapters or general devices which are arranged at the field level.

A large number of such field devices are produced and sold by the Endress + Hauser Group.

The operation of the field devices is usually via controls such as buttons or buttons, which are arranged on the housing of the respective field devices. Out

For reasons of cost, a portion of the field devices which should not be underestimated does not have any control elements arranged on the housing. Even in certain process conditions (Ex environment, hygienic applications) is to protect the system and / or the Field devices often dispensed with arranged on the housing controls.

The operation and / or parameterization of the field devices is often done in this case via a wireless radio link. For this purpose, the field devices have a radio interface. The operation, or parameterization then takes place, for example, by means of a mobile operating unit, for example by means of the "Field Xpert", the of the

Endress + Hauser Group is produced and distributed by means of a laptop or by means of a mobile device such as a smartphone or a tablet.

Common wireless standards are Wifi, Bluetooth, ZigBee, WirelessHART, etc.

The disadvantage here is that the radio interface is often permanently activated and the field device is thus not protected against access by unauthorized persons. Field devices, which are operated and / or parameterized by means of controls located on the housing, already have a protection by itself, as that the plant area is inaccessible to unauthorized persons. Service technicians need to enter the facility

for example, by means of a smart card or a PIN authenticate. On field devices described above, which operated by means of a radio link, or

can be parameterized, depending on the range of the used

Radio connection, but also be accessed from outside the plant.

Based on this problem, the invention has for its object to provide a system and a method which allows a radio interface of a field device of the process automation in a simple manner, if necessary, to activate locally.

The object is achieved by a system for activating a radio interface of a field device of process automation, comprising:

a disconnection unit; and

the field device, which has a detection unit for detecting the

Includes isolation unit and the radio interface,

wherein the enabling unit is arranged on the field device, and wherein after successful detection of the enabling unit by means of the detection unit, the radio interface is activated. The idea underlying the invention is to activate a radio interface by arranging, equivalent to attaching, the enabling unit on the housing of the field device, thereby enabling parameterization and / or operation of the field device by means of a radio link. The on-site presence of a

Service technician is thereby proved. The radio interface is thus activated only if it is really needed.

The operation or parameterization is then carried out via an operator panel, such as

For example, a handheld device, a laptop or a mobile device such as a smartphone or a tablet. After arranging the activation unit, a service technician is enabled to operate the two-handed operation of the operating unit.

Furthermore, the selection of a field device is simplified. Only the radio interface of that field device, on the housing of which the activation unit is located, is activated. A confusion of the field devices during operation and / or parameterization by means of radio communication is thus excluded.

Field devices which are described in connection with the invention have already been mentioned by way of example in the introductory part of the description.

According to a first variant of the system according to the invention, it is provided that the disconnecting unit is a magnet which is attached to the housing of the field device. The housing consists in this case essentially of a metallic material.

In an advantageous embodiment of the first variant of the system according to the invention, it is provided that the detection unit comprises a Hall sensor. The Hall sensor measures a magnetic field, wherein by arranging the enabling unit on the field device, a magnetic field change, and thus the presence of the

Unlock unit, is detected

According to a second variant of the system according to the invention, it is provided that the unlocking unit is a substantially cylindrical object, in particular is a screwdriver or a pin, which is inserted into a recess of the housing of the field device. The object is placed in the recess so that it is fixed in the recess, whereby the service technician has both hands free. Another advantage is that the cylindrical object is an object that the service technician usually carries with him anyway.

In an advantageous embodiment of the second variant of the system according to the invention it is provided that the detection unit comprises a coil which is located in the recess of the housing of the field device or which radially surrounds the recess of the housing of the field device. The coil measures an inductance, wherein a change in the inductance, and thus the presence of the enable unit, is detected by arranging the enable unit on the field device. In a further advantageous embodiment of the second variant of

According to the invention, it is provided that the detection unit is at least two electrodes. These measure a capacitance, wherein a change in the capacitance, and thus the presence of the disconnecting unit, is detected by arranging the disconnecting unit on the field device.

A preferred development of the system according to the invention provides that the housing of the field device is a keyless housing. In particular, it is a housing which is suitable for use in an Ex environment or in a hygienic environment.

Furthermore, the object is achieved by a method for activating a

Radio interface of a field device of process automation solved, comprising:

Arranging a disconnection unit on the field device;

- Detecting the unlock unit;

- Activate the radio interface, in case the unlock unit

was successfully detected. In a preferred development of the method according to the invention, it is provided that the radio interface is deactivated when the disconnection unit is removed from the field device. As a result, a manual deactivation of the radio interface is not required. It can also be provided to leave the radio interface after removal of the activation unit for a certain time in the activated mode before the radio interface is deactivated.

According to a particularly advantageous embodiment of the system according to the invention, it is provided that the radio interface is deactivated after a defined time interval, even if the activation unit is further arranged on the field device. In this way it is prevented that the radio interface is permanently activated, which becomes critical, for example, when the service technician forgets to remove the enabling unit from the field device. In order to reactivate the radio interface, the enabler unit must be removed from the field device and re-arranged. It can also be provided to leave the radio interface after removing the activation unit for a certain time in the activated mode, so that there is no interruption of the radio connection when removing and re-arranging the activation unit. It may be provided to inform the service technician in time if an automatic deactivation of the radio interface is imminent. This can

for example, via an acoustic or optical signal. For this purpose, the field device may have a loudspeaker and / or a lighting unit. According to a first variant of the method according to the invention, it is provided that the disconnection unit is detected by means of a Hall sensor, wherein the Hall sensor measures a magnetic field, and wherein a magnetic field change is detected by arranging the disconnection unit on the field device. According to a second variant of the method according to the invention, it is provided that the disconnection unit is detected by means of a coil, wherein the coil measures an inductance, and wherein by arranging the disconnection unit on the field device a change in the inductance is detected.

According to a third variant of the method according to the invention, it is provided that the disconnection unit is detected by means of at least two electrodes, the electrodes having a capacitance, and wherein a change in the capacitance is detected by arranging the disconnection unit on the field device.

A preferred development of the method according to the invention provides that the field device is operated and / or parameterized via the radio interface when the radio interface is activated. For this purpose, the field device is connected by means of the radio link to a mobile operating unit such as a laptop or a mobile terminal such as a smartphone or a tablet.

The invention will be explained in more detail with reference to the following figures. It shows

1 shows a first variant of an embodiment of the system according to the invention for activating a radio interface of a field device of process automation; and

2 shows a second variant of an embodiment of the system according to the invention for activating a radio interface of a field device of process automation.

1 shows a first variant of an embodiment of the system according to the invention for activating a radio interface FS of a field device F of FIG

Process automation. A field device F is integrated in an application in a system of process automation. About a not shown

Communication link communicates the field device F with a higher-level unit, not shown, and sends in particular raised process values to the parent unit.

The field device F is in a critical process environment, in particular an explosion or a hygienic process environment. The housing of the field device F is therefore designed buttonless, to prevent moisture or aggressive Vapors enter the interior of the field device F through a gap between the keys and the housing and can damage the electronic components contained in the field device. Alternatively, the system according to the invention of course also for a field device with a housing with control buttons can be adapted.

For operation and / or parameterization, the field device F has a radio interface FS. This can, in principle, be used for every common radio protocol, in particular Wifi,

Bluetooth, ZigBee, but also for wireless fieldbus protocols such as WirelessHART or similar. be designed. To protect the field device F from unauthorized access is the

Radio interface FS deactivated in normal operating mode. To activate the

Interface is a release unit FE stapled in the form of a magnet to the metallic housing of the field device F.

In the inside of the housing, preferably on the inner surface of the housing wall, there is a detection unit DE, which comprises a Hall sensor and is in communication with an electronic unit E. This measures a magnetic field permanently or at predetermined time intervals. If the activation unit FE is attached to the housing of the field device F, then the magnetic field measured by the detection unit DE changes drastically. The detection unit DE then sends to the

Electronics unit E a detection signal, whereupon the electronic unit E the

Radio interface FS activated.

A service technician can now record a radio connection with the field device F by means of a mobile unit ME and operate and / or parameterize this by means of the mobile unit ME.

After removal of the activation unit FE, the radio interface FS is deactivated again to again ensure protection against unauthorized persons. It may further be provided that the radio interface FS is deactivated after a defined time interval, even if the enable unit FS is still arranged on the field device F. In order to activate the radio interface again, analogously to the principle of a deadman key, the disconnection unit has to be removed from the field device and be arranged again.

It can also be provided, the radio interface after removing the

To leave release unit for a certain time in the activated mode, so that when removing and re-arranging the unlock unit no interruption of the radio connection.

FIG. 2 shows a second variant of an embodiment of the system according to the invention for activating a radio interface FS of a field device F of FIG

Process automation. In contrast to the detection unit DE shown in FIG. 1, which comprises a Hall sensor, the detection unit DE shown in FIG. 2 comprises a coil. This is located in a recess of the housing of the field device F. This measures permanently or at predetermined time intervals an inductance. To activate the radio interface FS, an elongate, in particular metallic, substantially cylindrical, object is introduced into the recess of the housing. As a result, the value of the inductance measured by the detection unit DE changes drastically. The detection unit DE then sends to the

Electronics unit E a detection signal, whereupon the electronic unit E the

Radio interface FS activated.

Alternatively, the detection unit DE may be two or more electrodes. These measure a capacity, wherein a change in the capacitance, and thus the presence of the enabling unit FE, is detected by arranging the enabling unit FE on the field device F.

It goes without saying that the inventive method and the

inventive system is applicable to any type and number of field devices F and are not limited to the embodiments shown in the figures Fig. 1 and Fig. 2. LIST OF REFERENCE NUMBERS

E electronic unit

F field device

DE detection unit

FE unlock unit

FS radio interface

ME Mobile control unit

Claims

claims

System for activating a radio interface (FS) of a field device (F) of process automation, comprising:

a disconnection unit (FE); and

- The field device (F), which comprises a detection unit (DE) for detecting the enabling unit (FE) and the radio interface (FS), wherein the enabling unit (FE) is arranged on the field device (F), and

wherein after successful detection of the enabling unit (FE) by means of the detection unit (DE), the radio interface (FS) is activated.

A system according to claim 1, wherein the enabling unit (FE) is a magnet which is attached to the housing of the field device (F).

The system of claim 2, wherein the detection unit (DE) comprises a Hall sensor.

System according to claim 1, wherein the unlocking unit (FE) is a substantially cylindrical object, in particular a

Screwdriver or is a pin, which is inserted into a recess of the housing of the field device.

System according to claim 4, wherein the detection unit (DE) comprises a coil which is located in the recess of the housing of the field device (F) or which radially surrounds the recess of the housing of the field device (F).

The system of claim 4, wherein the detection unit (DE) is at least two electrodes.

System according to at least one of the preceding claims, wherein the housing of the field device (F) is a keyless housing.

8. A method for activating a radio interface (FS) of a field device (F) of process automation, comprising:

Arranging an enabling unit (FE) on the field device (F);

- Detecting the enable unit (F);

- Activating the radio interface (FS), in case the enabling unit (FS) was successfully detected.

9. The method according to claim 8, wherein the radio interface (FS) is deactivated when the enabling unit (FS) is removed from the field device (F).

10. The method according to at least one of claims 8 or 9, wherein the

Radio interface (FS) is deactivated after a defined time interval, even if the enable unit (FS) is still arranged on the field device (F).

1 1.A method according to at least one of claims 8 to 10, wherein the

Unlocking unit (FE) is detected by means of a Hall sensor,

wherein the Hall sensor measures a magnetic field and

wherein a magnetic field change is detected by arranging the enabling unit (FE) on the field device (F).

12. The method according to at least one of claims 8 to 10, wherein the

Unlock unit (FE) is detected by means of a coil,

wherein the coil measures an inductance, and

wherein by arranging the enable unit (FS) on the field device (F) a change in the inductance is detected.

13. The method according to at least one of claims 8 to 10, wherein the

Unlock unit (FE) is detected by means of at least two electrodes, wherein the electrodes measure a capacitance, and

wherein a change in the capacitance is detected by arranging the enabling unit (FE) on the field device (F).

14. The method according to at least one of claims 8 to 13, wherein the field device (F) with activated radio interface (FS) via the radio interface (FS) is operated and / or parameterized.