WO2011051007A1

WO2011051007A1 - Display unit and method for initially operating the display unit

Info

Publication number: WO2011051007A1
Application number: PCT/EP2010/061951
Authority: WO
Inventors: Thomas Jögel; Bernd Briechle; Martina Voglmeier; Robert Wotsch
Original assignee: Endress+Hauser Wetzer Gmbh+Co. Kg
Priority date: 2009-10-29
Filing date: 2010-08-17
Publication date: 2011-05-05
Also published as: DE102009046167A1

Abstract

The invention relates to a method for initially operating a display unit (AE). Said display unit (AE) is provided with factory settings, comprising the following steps: - Connecting the display unit (AE) to a digital field bus system (FB), via which a plurality of field bus users (G1, G2, G3) transmit data in the form of telegrams, - listening to data traffic via the digital field bus system (FB) by the display unit (AE) while the display unit (A) is initialized and/or integrated into the digital field bus system (FB); and - playing back at least a portion of the data transmitted by a field bus user (G1, G2, G3) of the field bus system (FB) on a display element of the display unit (AE) on the basis of the data traffic that was listened to, either directly after initialization of the display unit (AE) and/or integration of the display unit into the field bus system, or directly after a start sequence of the display unit (AE), without the user changing settings on the display unit (AE).

Description

Display unit and method for putting the display unit into operation

The invention relates to a display unit and a method for commissioning the same.

Fieldbus systems are widely used in process automation technology. These particular digital fieldbus systems allow communication between multiple fieldbus subscribers. The central

Process control is usually carried out by a process control system that is connected to the field devices. The field devices either provide information about the process flow or control it.

The field devices are usually either sensors e.g. for temperature, pressure, flow or level or actuators such as e.g. Valves. The sensors record the process variables and convert the analog measuring signals into digital measured values that are sent to the process control system via the fieldbus system, for example. The process control system in turn evaluates the digital measured values and controls the actuators by means of digital control commands, which are also sent via the fieldbus.

Often, it is necessary to visually match the current reading taken by a sensor, e.g. for the operator on site play. Most sensors therefore have a display element for directly displaying the measured value. However, if the sensor is placed inconveniently or does not have a display element, it has become known from the prior art to use a display unit that can be connected to the fieldbus system at any point. Such a display unit has become known, for example, from European Patent EP 1079291 B1.

A display unit without its own fieldbus address can not be detected in the fieldbus system, although the display unit their energy from the

Fieldbus system refers. This has the consequence that a display unit without its own fieldbus address not from a control room but only on site can be configured. It is therefore not possible from a standpoint to determine how many such display units are present in a fieldbus system.

When connecting a fieldbus participant to eg. A Profibus

The fieldbus system must ensure that the lines of the fieldbus system are not interchanged. Interchanging the lines can result in a Profibus slave no longer being accessible via the fieldbus system, while other fieldbus users remain accessible. If the swap happens when looping through the fieldbus lines in the connector, even all subsequent subscribers can no longer be addressed.

The invention is therefore based on the object to inform a user about the functionality of the display unit immediately after connecting the display unit to the fieldbus system.

The object is achieved by a display unit and a

Procedure for commissioning the display unit solved.

With regard to the method, the object is achieved in that the

Display unit with factory settings and that the procedure comprises the following steps:

Connecting the display unit to a digital fieldbus system, via which several fieldbus participants send data in the form of telegrams;

Listening to data traffic over the digital fieldbus system by the display unit while the display unit is being initialized and / or integrated into the digital fieldbus system; and

Reproducing at least part of the data transmitted by a field bus user of the fieldbus system on a display element of the display unit based on the intercepted data traffic either unmittplhar nanh Hpr Initialisiprunn Hpr Ari7Pinppinhpit i inH / nHpr Integration of the display unit in the fieldbus system or immediately after a start sequence of the display unit, without

Settings on the display unit can be made by a user.

The display unit may, for example, ex factory, i. provided by the manufacturer or due to a reset by a user with factory settings. Since the specific addressing of a system in which the display unit is to be used, but not known from the factory, is the

Pre-programming a display unit with one or more concrete fieldbus addresses ex factory not possible, i. the factory settings do not contain any specific fieldbus addresses.

The data traffic via the fieldbus system can take the form of telegrams. The telegrams can, for example. Send and / or

Receiver address, status displays, measured values and / or other

contain process-relevant information. The telegrams can be transmitted via the fieldbus system using a protocol such as the Foundation Fieldbus or Profibus DP / PA protocol. Furthermore, the display unit can be used exclusively for the reproduction of measured values and / or status indications of those connected to the fieldbus system

Fieldbus participants serve.

The display unit can be powered by the digital fieldbus system. Alternatively, it is also possible to connect the display unit separately to a power source, so that the display unit is supplied with energy independently of the fieldbus system.

After the display unit has been connected to the fieldbus system, the display unit can be initialized in the event that it is supplied with energy via the fieldbus system. Under Initialize, the internal

Run up the display unit to be understood. It can

7wpnkrlipnlir: h spin untprsnhiprllinhp Knmnnpntpn Hpr Ari7Pinppinhpit to initialize successively or simultaneously. For example. can the

Display element before, during or after a communication module of the display unit, which serves for data transmission via the fieldbus system, to be initialized. In one embodiment of the method, therefore, before the complete initialization of the display unit, the first

Initialized communication module, so that the data traffic via the fieldbus system can be heard already from the initialization of the communication module. After the display element has also been initialized or a start sequence of the display unit has expired, at least part of the data sent by a field bus subscriber can be reproduced on the display element of the display unit on the basis of the intercepted data traffic immediately thereafter.

Alternatively, the traffic can be intercepted while the

Display unit is integrated into the fieldbus system. From the prior art it has become known that during the initialization of

Discard display unit or the data transmitted during the integration of the display unit in the fieldbus system via the fieldbus system data, and only the display unit related parameter telegrams in the

To process the display unit. All other telegrams are rejected or not processed (see, for example, Profibus-DP Getting Started, Chapter 7.2.2 "Power_On", as well as Chapter 7.2.3 "Wait_Prm", PNO-Best.-Nr.:4.071).

According to the invention, however, at least part of the transmitted data is reproduced on a display element of the display unit. The data can be sent by a fieldbus user of the fieldbus system and, based on the intercepted data traffic, either immediately after

Initialization of the display unit and / or immediately after integration of the display unit in the fieldbus system or immediately after a start sequence of the display unit are played back. The expiration or termination of the start sequence can be communicated to a user, for example, by fading in a star screen on the display element. This sinnalisiprt pinpm rpnut pr place hate hip Ari7Pinppinhpit hptriphshprpit is Following the start sequence, a part of the data determined on the basis of the intercepted data traffic can then be reproduced. For example, the home screen may contain information about the model of the display unit and the manufacturer.

Of course, the data traffic can also be listened to after the initialization of the display unit or the respective components or after integrating the display unit into the fieldbus system, so that the data displayed on the display element can be updated.

Thus, an automatic display of the data transmitted via the fieldbus system without configuration, i. Intervention of a user, done. This automatic reproduction can serve as information about the functioning of the display unit, in particular if the

Mounting the display unit by an unqualified user

is carried out. The display unit can after integration into the

Fieldbus can still be configured, for example, from the control room to further values. This has the advantage that in the event that the display unit has a field bus address, a fitter can install the display unit and immediately receives feedback on the state and the functionality of the display unit. A parameterization can therefore be made at a later time by a specialist who has the appropriate facilities and protocol knowledge, for example. From a control room.

The display element of the display unit may, for example, be a liquid crystal display LCD. Furthermore, the display unit can be integrated in a housing. Furthermore, electrical and / or electronic

Circuits may be included in the housing of the display unit for operating and performing the functions of the display unit.

In one embodiment of the method is in the

Fieldbus subscriber whose transmitted data at least in part

wipHprnpnphpn wprdpn to pin FpIHnprät wplnhps Mpsswprtp inshpsnndprp cyclically, via the fieldbus system transmits, and wherein at least one measured value of a measured size of the field bus subscriber is reproduced on the basis of the intercepted data traffic. Usually measured values of the field devices are cyclically exchanged in the common protocols. However, field devices nowadays have a large number of tasks, so that a single measuring device also has different measured variables or from them

sends derived quantities in the form of measured values via the fieldbus system, in particular can be measured by a field device, i. Fieldbus participant, with a fieldbus address measured values of different measurands are sent.

In a further embodiment of the method, the display unit becomes a field bus address during integration into the fieldbus system

assigned. The integration of a field device can be understood as the assignment of a fieldbus address to a measuring device. During the

Integration, i. until the time when the display unit a

Field bus address assigned, the data traffic via the field bus system can already be listened to and at least partially reproduced by means of the display unit. Accordingly, data of a field device or a field bus subscriber can be reproduced before the integration of the display unit in the fieldbus system.

In a further embodiment of the method, the intercepted contains

Traffic the fieldbus addresses at least part of the

Fieldbus subscriber, and based on a stored in the display unit instruction, in particular an algorithm, the field bus address of a field bus station is selected, and at least a portion of the data sent from the selected field bus subscriber data are displayed by the display unit. Since the data traffic consists of telegrams which have an addressing in the form of field bus addresses, the intercepted data traffic can also be used to determine specific information about the fieldbus addresses and thus about the corresponding field devices. Since the display unit from the factory no concrete

FpIHhusaHmssp vnrnpnphpn wprdpn can hsnw pinp Anwpisunn in Hpr Display unit selected from the determined fieldbus addresses according to the instructions a certain. This selection can be realized on the basis of a program stored in the display unit, which reproduces an algorithm.

In a further refinement of the method, the measured value of the field bus subscriber which has the lowest field bus address is reproduced. Often the participant of a fieldbus system, so the

Fieldbus participant with the lowest address, the participant entrusted with the primary measurement task. Therefore, by displaying these measurements, a user can already be aware of the condition of the plant or process.

In a further embodiment of the method, the data traffic is monitored by means of a communication interface of the display unit. The

As already mentioned, the display unit can have a communication module or a communication interface which serves for communication via the fieldbus system. The communication interface or the module can also serve to listen to the data traffic via the fieldbus system.

In a further embodiment of the method, the data traffic is monitored via the fieldbus system until the display unit is included in the list of active users of the fieldbus system. On the basis of the hitherto intercepted data traffic, a field bus address can then be determined in accordance with the instructions stored in the display unit.

In a further embodiment of the method, the intercepted

Data traffic stored in a memory unit of the display unit. The intercepted data traffic may in particular be stored in a specific order in the memory unit, e.g. ordered according to the fieldbus addresses of

Telegrams that were intercepted, be stored.

In a further embodiment of the method is based on the natpnx / prkphrs heard pin 7ustanrl Hpr Ari7Pinppinhpit pin status HPS Fieldbusteilnehnners, a status of a transmitted measured value and / or a status of the fieldbus system determined and / or reproduced. In the

Digrams of the intercepted data traffic may furthermore contain various information concerning the status of a field bus subscriber or the status of a transmitted measured value. At the status of the

Feldbusteilnehmers may, for example, to an error status, which was triggered due to a defect of the field bus participant act. The corresponding measured value transmitted by the field bus subscriber is then also identified with a corresponding error status, for example in the form of a corresponding bit. In the case that the

Fieldbus participant is a valve, it may be the status but also the information that indicates, for example, whether the valve is closed or open.

In a further refinement of the method, the display unit is connected to the digital fieldbus system by a user without prior configuration and at least part of the data transmitted by the field bus subscriber is reproduced.

In a further embodiment of the method, the display unit is configured after commissioning. After startup, i. After the display unit has been integrated into the fieldbus system, the display unit can be configured so that, for example, the display of a measured value of a fieldbus user selected by a user takes place.

In a further embodiment of the method, the display unit after integration into the fieldbus system at least by the selection of a field bus subscriber of the digital fieldbus system and / or by selecting a particular format in which of the selected

Fieldbus subscriber data transmitted, configured. The format may, for example, be a plain text display.

Regarding the display unit, the task is performed by a display unit for pin Hinitalps FpIHhussvstpm 71 ir ni imhführunn HPS vnrnpstplltpn Vprfahrpns solved. The display unit can for this purpose have a separate memory area in which the intercepted data traffic is stored.

On the other hand, field devices today often have memory modules. These can then be used during commissioning to save the intercepted data traffic. As already mentioned, the display unit must also have a communication module which serves for communication via the fieldbus system. During commissioning, the communication module can then be used to listen to data traffic.

In this case, it may be necessary in particular to store the entire data traffic during which the communication on the fieldbus system is intercepted, since this makes it possible to determine the addresses of the field bus subscribers present in the fieldbus system. From these addresses can then be selected on the basis of the stored in the display unit instruction (s) whose transmitted data then at least partially visible on the display element in particular for a user

be reproduced.

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

Fig. 1 a), b), c): a schematic representation of the commissioning of a display unit.

FIG. 1 shows a fieldbus system FB to which one has been configured

Process control system PLS and multiple field devices G1, G2, G3 are connected. The field devices G1, G2, G3 are measuring devices. The fieldbus system FB cyclically transmits a different number of measured values of the respective measuring devices G1, G2, G3 via the fieldbus system FB. The (fieldbus) addresses of the gauges G1, G2, G3, the same time

Fieldbus participants are assigned by the process control system PLS. Thus, the first measuring device G1, the field bus address "20", the second

Meter G2 the field bus address "21" and the third meter the

As already mentioned, field devices which output several measured values of different physical quantities are commonplace today.The first measuring device G1 reproduces the values "1, 2, 3" in the illustrated exemplary embodiment, while the second measuring device G2 displays the values " 4, 5 ". The third measuring device G3 merely represents a value" 6 ". A value corresponds to a measured value which is output by the respective measuring device G1, G2, G3.

In Figure 1 a), the display unit AE is not yet connected to the fieldbus FB.

After connecting an unconfigured display unit AE

(Delivery state with factory settings), shown in Figure 1 b), the display unit AE displays automatically (ie without further configuration) the first value of the field bus subscriber with the lowest address. In the exemplary embodiment shown, this is the value "1" of the first measuring device G1.

Since the fitter who installs the display unit does not know the division of the values on the fieldbus system FB, further values of the identical address can be selected via "next value." This is shown in FIG. LIST OF REFERENCE NUMBERS

AE display unit

FB fieldbus system

PLS process control system

G1 First measuring device

G2 second measuring device

G3 Third measuring device

Claims

claims

1 . Method for starting up a display unit (AE),

which display unit (AE) is provided with factory settings, comprising the following steps:

Connecting the display unit (AE) to a digital fieldbus system (FB), via which several fieldbus participants (G1, G2, G3) send data in the form of telegrams,

Interception of data traffic via the digital fieldbus system (FB) by the display unit (AE) while the display unit (A) is initialized and / or integrated into the digital fieldbus system (FB); and

Reproduction of at least part of the data sent by a field bus subscriber (G1, G2, G3) of the fieldbus system (FB) on a display element of the display unit (AE) on the basis of the intercepted data traffic either immediately after the initialization of the display unit (AE) and / or integration of the display unit in the fieldbus system or immediately after a start sequence of the display unit (AE), without settings on the display unit (AE) are made by a user.

2. The method according to claim 1,

wherein the field bus subscriber (G1, G2, G3) whose transmitted data is at least partially reproduced is a field device (G1, G2, G3) which transmits measured values, in particular cyclically, via the fieldbus system (FB), and

wherein at least one measured value of a variable measured by the field bus subscriber (G1, G2, G3) on the basis of the intercepted data traffic

is reproduced.

3. The method according to any one of the preceding claims,

wherein the display unit (AE) during integration into the digital FpIHhusspstip (FR ^ pinp FpIHhusaHrpssp i inpwipspn

4. Method according to one of the preceding claims,

characterized,

the intercepted data traffic contains the field bus addresses of at least part of the field bus subscribers (G1, G2, G3),

and that based on a stored in the display unit (AE) instruction, in particular an algorithm, the fieldbus address of a

Fieldbus participant (G1, G2, G3) is selected,

and that at least part of the data sent by the selected field bus subscriber (G1, G2, G3) is reproduced by means of the display unit.

5. Method according to one of the preceding claims,

characterized,

that the measured value of the field bus subscriber (G1, G2, G3) is reproduced, which has the lowest field bus address.

6. The method according to any one of the preceding claims,

characterized,

that the data traffic by means of a communication interface of

Display unit (AE) is being monitored.

7. The method according to any one of the preceding claims,

characterized,

that the data traffic via the digital fieldbus system (FB) is intercepted until the display unit (AE) in the list of active participants of the

Fieldbus system (FB) is recorded.

8. The method according to any one of the preceding claims,

characterized,

the intercepted data traffic is stored in a memory unit of the display unit (AE).

9. Method according to one of the preceding claims,

characterized,

a state of the display unit (AE), a status of the field bus subscriber (G1, G2, G3), a status of a transmitted measured value and / or a status of the digital fieldbus system (FB) are determined and / or reproduced on the basis of the intercepted data traffic.

10. The method according to any one of the preceding claims,

characterized,

the display unit (AE) is connected to the digital fieldbus system (FB) by a user without prior configuration and reproduces at least part of the data sent by the field bus subscriber (G1, G2, G3).

1 1 .Method according to one of the preceding claims,

characterized,

the display unit (AE) is configured after commissioning.

12. The method according to any one of the preceding claims,

wherein the display unit (AE) after integration into the digital

Fieldbus system (FB) at least by the selection of a field bus subscriber (G1, G2, G3) of the digital fieldbus system (FB) and / or by selecting a particular format in which the selected

Fieldbus participants (G1, G2, G3) transmitted data is configured.

13. Display unit for a digital fieldbus system (FB) for carrying out the method according to one of the preceding claims.