Method for transmitting data of measurements between two measuring transformers

FIELD: automation of processes.

SUBSTANCE: method is claimed for transmitting measurement data between two measuring transformers, made with possible transmission of digital data according to "master - slave" principle through two communication connections in control system which is used as master device, and analog signals. Digital signals are also transmitted between both measuring transformers through additional communication connection, received digital signals are researched at least based on one characteristic value of measurements, required for processing in measuring transformer-receiver.

EFFECT: simplification and increased profitability of data transmission.

17 cl, 1 dwg

 

The invention relates to a method of data transfer between the two transducers according to the restrictive part of paragraph 1 of the claims.

In automation engineering processes are transducers that serve for registering and/or impact on the process variables. Examples of such transducers are sensors, flow meters, gauges and thermometers, instruments for measuring pH-value and redox potential instruments for measuring conductivity, etc. that as sensors, register the corresponding process variables level, pressure, temperature, pH-value and the conductivity.

Many such transducers are manufactured and distributed by the firm Endress + Hauser.

Often transducers via a communication connection associated with the parent unit, for example a system or control unit. An example of such a communication link is the HART Protocol. Using this standard transducers can transmit the control system data in both digital and analog form. In addition, transducers using the appropriate Executive unit is very easy to parameterize and to bring into operation. Data of measurements and the second transfer control system in analog form by known 4-20 mA technique. Because the HART communication works on the principle of "master - slave"mode, the transmitters can send data management system by request only host.

Partially desirable to transfer data between multiple transducers using the control system. This exchange of data is possible, for example, in multi-channel mode HART. The disadvantage is however, that each of the measuring transducer, connected to a multichannel network HART and having a non-zero address, must have a permanent current consumption 4 mA. Analog transmission of signals to the system control in multichannel mode HART impossible.

In some applications, it is necessary to identify and to process the measured values derived from the measurement data of different transducers. One possibility for this is that measurement data transfer control system, where processing is provided by the corresponding machining program. This method, however, has various disadvantages. First, reprogramming of the control systems is very complex. Further processing programs typically focus on the user and require know-how which is available only from the manufacturer transducers and reluctantly passed them. To the ome, management system designed for managing tasks, and not on specialized processing of the measurement data. For manufacturers of control systems, this would mean significant costs to integrate in their systems, these specialized functionality.

Another possibility of determining and processing the measured values derived from the measurements of different transducers, is that the measurement data are transmitted to the computer of consumption (for example, RMS621 firm E+H Wetzer and processes. With computer consumption of processed data is then passed to the control system. Decisive disadvantages consist in the fact that in the chain of processing required additional block, and that the measurement data is usually passed through analog interfaces, which can lead to loss of precision.

The objective of the invention is therefore to provide a method for data transfer between the two transducers, which would not have these drawbacks and could be implemented simply and cost-effectively.

This problem is solved by a method described in paragraph 1 of the claims.

Preferred refinements of the invention are characterized in dependent clauses.

The basic idea of the invention consists in that the two measuring the transformation is of Atala, transmitting the control system as a leading digital signals via two communication connections on the principle of "master - slave" and analog signals, to provide additional communication connection to transfer digital signals between the two communication connections, and the transmitter-receiver examines the received signals, at least one characteristic value measuring transducer-transmitter for detecting only the necessary measured values.

In one improvement of the invention the connection between the transducers and the control system is standard HART. Thus, the transmitters can communicate with the control system both in analogue and in digital form and additionally to exchange digital data between themselves in accordance with standard HART.

The characteristic value may be a parameter block that is installed in the standard HART. Each parameter block describes one measured value in one specific unit (e.g., pressure, temperature etc).

In order for the transmitter-transmitter transmit their measured data in equal intervals of time the transmitter-receiver is, measuring transducer-transmitter transfer in burst mode HART. In this mode, one measuring transducer as the slave device may send their measurement data regardless of the request from the master.

In one alternative embodiment, receiving the measuring transducer is operated in the master mode device periodically reads the measurement data of the measuring transducer-transmitter.

To determine the indicated measured value in receiving the measuring transducer is installed computing unit with the manufacturing software program.

In one particular embodiment of the invention the receiving measuring transducer is a Vortex measuring device, a measuring transducer-transmitter - gauge, and operate a program for velocity and pressure as indicated measured value specifies, for example, the mass value, a standard volume or heat flow.

The invention is explained in more detail on the example of implementation shown in the drawing, in which

- schematic representation of the two transducer associated with the control system.

The drawing shows schematically how the two transducer M1, M2 equipment machine is implementing a process associated with the L control via two communication connections KOM1, KOM2. Supply voltage to both measuring transducers occurs through two sources MUS1, MUS2 power that are embedded in the communication connection KOM1, KOM2. A communication connection COM, KOM2 is a two-wire connection with the respective measuring transducer M1, M2. In the communication connection KOM1, KOM2 provided a communication connection COM, through which both the communication connection KOM1, KOM2 may share digital signals. For reasons of explosion protection in the communication connection COM there are two HART Communicator K1, K2, causing galvanic isolation communication connection COM. The dashed line shows the communication path for data transfer between the two transducers M1, M2. Data transfer occurs directly via the communication connection COM, and not through the system L management.

System L control is used mainly to perform control tasks. The relationship between the L control and measuring transducer M1 occurs either via the current loop 4-20 mA or digital HART signals. Measuring transducer M1 represents, for example, measuring the pressure transducer. Measuring transducer M2 is, for example, measuring Vortex Prowirl 73 of the firm Endress + Hauser.

Below the method according to the invention is described in more detail. Via the communication connection COM digital signals can be transmitted from the measuring transducer M1 measuring transducer M2. This requires only minor reprogramming of the measuring transducer M2. For the measuring transducer M1 you can use any gauge with HART interface. Because the system L management is not involved in this exchange, in changing the programming of the control system is not necessary. This is very important.

For the detection and processing of relevant measured values measuring transducer-receiver M2 explores coming from the transducer-transmitter M1 signals, at least one characteristic value measuring transducer M1. Related to this characteristic value measured value process then in the measuring transducer M2. Required measured pressure value find via option module installed in the standard HART.

To measuring transducer M1 passed their measurement data measuring transducer M2, measuring transducer M1 is transferred via the control unit (for example, pocket PC) in burst mode HART. In the volume mode, the transmitter M1 transmits its measurement data regardless of the request through the system L management. Thus, in the possession of the measuring transducer M2 are constantly the actual measurement data of the measuring transducer M1, so as provided in the measuring transducer M2 computing unit can be obtained also relevant derived measured value.

In one alternative embodiment of the invention, the measuring transducer M2 with its actuation checks the communication link K2 to incoming batch of messages. If not, then measuring transducer M2 trying to bring the measuring transducer M1 in batch mode. If this fails, then the above method of data transfer can be performed.

In another alternative embodiment of the invention, the measuring transducer M2 operate in the master mode device. In this mode, the master device M2 periodically reads the measurement data of the measuring transducer M1. This mode allows, however, to use only one additional master device, such as a system L management. In this case, the parameterization of the measuring transducers M1, M2 can no longer be attached to either one of the control unit, since the latter must always function as a master device.

As one of the major advantages of the invention should provide that special measuring transducer M2 can be used with different transducers M1, which can be from different manufacturers, so that according to these measurements both transducers to calculate certain dependent measured value. Another aspect of the invention is that no changes to the system programming L management. Another aspect of the invention is that the measurement data are transmitted to the transmitter M1 in digital form, without loss of accuracy due to analog and subsequent analog-to-digital conversion. System L management, regardless of the communication connection COM communicated with transducers M1, M2. Minor changes to the software are only required for the measuring transducer M2.

Using the method according to the invention, the possible easy transfer of measurement data between the two transducers M1, M2.

1. The method of data transfer between the two transducers, are designed to transmit digital signals on the principle of "master - slave" through two communication connection management system is Oia, serving as a master device, and the analog signals, wherein the digital signals are passed between the two transducers via an additional communication connection and the transmitter-receiver configured to research the incoming digital signals, at least one characteristic value measuring transducer-transmitter for the detection of the measurement data required for processing in the measuring transducer to the target.

2. The method according to claim 1, characterized in that the connection between the transducers and the control system are carried out by the standard HART.

3. The method according to claim 2, characterized in that the transmitter-receiver processes related to the corresponding numerical value of the parameter block, which is installed in the standard HART.

4. The method according to claim 2, characterized in that the transmitter-the transmitter is switched to burst mode HART for transmission of measurement data with equal intervals of time.

5. The method according to claim 1, characterized in that the transmitter-receiver operate in the master mode device and reads the measurement data of the measuring transducer-transmitter.

6. The method according to claim 1, characterized in that h is on the transmitter-receiver and the transmitter-the transmitter register different measured values.

7. The method according to claim 6, characterized in that the measuring transducer-receiver set computing unit with the manufacturing software program that determines the measured value, derived from different measured values.

8. The method according to claim 7, characterized in that the transmitter-receiver is a Vortex measuring device, a measuring transducer-transmitter - gauge, which determine the rate of flow and pressure in the environment.

9. The method according to claim 8, characterized in that the measuring device Vortex has a flow computing unit, configured to determine the pressure and velocity environment derived measured values (for example, the value of the heat flux).

10. The method according to claim 9, characterized in that the measuring device Vortex contains additional built-in temperature sensor.

11. The method according to claim 10, characterized in that the measuring device Vortex has a flow computing unit, which is the rate of flow of the medium, temperature and pressure determines the output measured value (for example, the value of the heat flux or the value of the mass flow).

12. The method according to claim 7, characterized in that the transmitter-receiver is a Vortex measuring device with built-in temperature is th sensor, and measuring transducer-transmitter - thermometer.

13. The method according to item 12, characterized in that the measuring device Vortex has a flow computing unit, which is the speed of the current environment, the temperature value of the temperature sensor of the measuring device Vortex and the temperature of thermometer determines the output measured value (for example, the removal of energy).

14. The method according to claim 7, characterized in that the transmitter-receiver is a Vortex measuring device, and measuring transducer-transmitter - thermometer, which determine the velocity and temperature of the environment.

15. The method according to 14, characterized in that the measuring device Vortex has a flow computing unit, which is determined by the rate of flow of the medium and the temperature output measured value (for example, the value of the heat flux or the value of the mass flow of liquids or vapour).

16. The method according to claim 1, characterized in that the transmitter-receiver reads and processes the signals of more than one measuring transducer-transmitter.

17. The method according to claim 8, characterized in that the transmitter-receiver is Coriolis flow meter, ultrasonic flow meter or flow meter magnetic-inductive or thermal action is I.



 

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