Control device for production process control loop

FIELD: information technology.

SUBSTANCE: control device for a process control loop has a housing (50) which can be clamped during the production process. The circuit (62) of the loop interface is connected to the process control loop (18) and receives data from the process control loop (18). Memory (64) stores data received by the circuit (62) of the loop interface from the process control loop (18).

EFFECT: simple process of controlling production processes.

25 cl, 4 dwg

 

The LEVEL of TECHNOLOGY

This invention relates to control systems (technological) processes of the type used to control production processes and/or management. More specifically, this invention relates to the control data on the contours of the management processes used in such systems.

Field devices (such as controllers, control devices and transmitters processes are used in industry industrial process control remote control, or read process variable. For example, such a process variable, such as temperature, pressure, etc. may be transmitted to the control transmitter process variable. Read the process variable can be used for process control or can provide information about the process for the operator. For example, information about the pressure of the fluid process may be transferred to the control room and used for process control, for example, through a control valve at the oil factory.

Communication with field devices can be accomplished in several ways. One way is to use a loop process control. Such control loops processes have two wires that are used on the I data transfer. In some designs, these two wires are also used to power devices in the production environment. One Protocol signaling loop process control is a 4-20 mA signal, which is used to represent the process variable. Another method of signal transmission is a communication Protocol HART®, which puts the digital information on top of the 4-20 mA signal. Another way is usually called the Fieldbus communication Protocol, in which the level of the analog current loop is not used to transmit information, and all data is transferred in digital form.

Because of the complexity of communication protocols has increased the complexity of network device configuration for a production environment has also increased. In the design of complex network topology, can be particularly difficult to diagnose and to identify faults related to network connection.

The INVENTION

The control device of the control loop process includes a diagram of the interface circuit, configured to connect with loop process control and receive data from the control loop process. The memory stores data received by the circuit interface circuit from the control circuit process. In one configuration, the control device circuit is implemented in the host, which also uses the light is utilised to perform the configuration of other devices in the control loop process.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 is a simplified diagram of the process control system including the control device of the control loop process.

Figure 2 is a block diagram of the control device of the control loop process shown in figure 1.

Figure 3 is a simplified block diagram illustrating the stage of recording data in accordance with this invention.

Figure 4 is a simplified block diagram showing steps related to the recovery of stored data.

DETAILED DESCRIPTION

As discussed in the section "prior art", the network device configuration process can be complex and, therefore, difficult to diagnose problems. For example, the construction of the measuring devices Fieldbus may require a complex network topology. This complexity can lead to problems in networking, as well as to difficulties in diagnosing such problems. This can lead to additional service calls to diagnose problems associated with networking. Such issues can be particularly difficult when the production process is located in a remote area, or when the staff is inexperienced in diagnosing problems associated with networking. This invention provides the control device of the control loop process is m, made with the possibility of attachment conditions (operating conditions) of the production process and collect data from the two-wire circuit. These data are stored in memory and available for subsequent use by the technician to identify faults in the network path management process.

Figure 1 is a diagram of a system 10 process control or control, which includes control unit 8 of the control loop process. The control device 8 of the circuit is mounted in the conditions of the manufacturing process on the base part 6. The system 10 process control also includes a transmitter 12 and the positioner valve 22 connected to the pipe 16 process. The sensor 21 is shown in General in figure 1 and connected to the transmitter 12. Figure 1 also shows the positioner valve 22, is connected to the control element 24, which may contain, for example, a valve.

One typical way to transmit information in the system process control and control system includes a control amount of current flowing through the control loop process. Current is supplied from current source in the control room and transmitter process variable controls the current based on the read process variable. For example, the signal current of 4 mA can be used to indicate zero on the account, and an output of 20 mA can be used to specify read full scale. Similarly, the level of current that is managed in the control room, can be used to control valve positioners, etc. recently, the transmitters used digital circuits that communicate with the control room using a digital signal, which is superimposed on the analog signal current, the current through the control loop process. One example of such method is a communication Protocol HART®.

Fieldbus is a communication Protocol developed by the Fieldbus Foundation and aimed at determining the level or communication Protocol to transmit information to the control loop process. In the Fieldbus Protocol, the current through the circuit is not used for transmission of the analog signal. Instead, all information is transmitted in digital form. In addition, the standard Fieldbus and standard, known as Profibus, allow the configuration of transmitters in multidrop configuration of the communication line, in which two or more transmitters are connected to the same control loop process. Other communication protocols include MODBUS® or standard Ethernet. In some configurations, two, three, four or any number of wires can be used to connect to the device process, including non-physical connection, such as RF(radio frequency) connection.

The control device 8 of the control loop process, the transmitter 12 and the positioner 22 is connected with the circuit 18 process control, which operates in accordance with standard Fieldbus, Profibus, or HART®. However, the invention is not limited to these standards, or two-wire configuration. The circuit 18 process control extends between locations in terms of production and dispatch 20. In some embodiment, in which the circuit 18 operates in accordance with the HART®loop 18 can carry a current I, which corresponds to the read process variable. In addition, the HART® gives you the ability to overlay digital signal on the current through the circuit 18 so that the digital information can be sent to the transmitter 12 or accepted from him. When working in accordance with standard Fieldbus circuit 18 carries digital signals and can be connected to multiple field devices, such as other transmitters. Any number of circuits 18 process control can be used and connected to the devices mounted in a production environment, as appropriate. The configuration shown here are only for example.

As discussed above, figure 1 is a diagram showing an example of the system 10 process control, which includes the line 6 process which transfers the fluid process, and the circuit 18 process control, carrying current I of the circuit. The transmitter 12, the controller 22 (which is connected with the final control element in the circuit, such as the actuator, valve, pump, motor or solenoid), a communication tool 26 and dispatch 20 are part of the circuit 18 process control. It is clear that the circuit 18 is shown in one configuration, and that can be used by any suitable control loop process, such as loop 4-20mA, 2, 3 or 4-wire circuit, the circuit multidrop communication line and a circuit operating in accordance with the HART®, Fieldbus or other digital or analog communication Protocol. In addition, such a control loop process may use different wireless technologies.

In operation, the transmitter 12 reads such a process variable, as a stream, using the sensor 21, and transmits the read variable process circuit 18. This variable can be accepted by the controller/actuator valve 22 and/or equipment 20 control room. The controller 22 is shown connected to the valve 24 and is able to manage the process through the control valve 24, thereby changing the flow in the pipe 16. The controller 22 receives the input control circuit 18, for example, from the control room 20 or transmitter 12 and as the reaction regulates the valve 24. In another embodiment, the controller 22 internally generates the control signal based on the signals of the process adopted by the circuit 18. Devices include, for example, the transmitter 12 (such as a pressure transmitter 3051 S, available from the Corporation Rosemount), the controller 22, the control device 8 of the control loop process control 20 shown in figure 1. Another type of device process is a PC, a block of programmable logic (PLC) or another computer connected to the circuit using the respective schemes, I/o for the control, management and/or transfer to the path.

Figure 2 shows a simplified diagram of the control device 8 of the control loop process. The control device 8 circuit includes a housing 50 made with the possibility of connection with the supporting part 6. In the configuration shown in figure 2, the control device 8 of the control loop process is designed with the ability to have a similar form factor to that of a typical transmitter control process. However, you may have any suitable design. In addition, the bracket 52 that is used to connect the control device 8 of the control loop process with the supporting part 6, can be performed in accordance with standard designs, therefore, is that it can be used with existing fasteners of this type for mounting transmitters process.

As shown in figure 2, the control device 8 of the control loop process includes a microcontroller 60, scheme 62 I/o and memory 64. During operation, the circuit 62 I/o connected to the circuit 18 process control and control of data traffic carried on the circuit 18. In some configurations, the circuit 62 I/o also include the output energy, which provides energy for the circuits within the control device 8, which is generated from the current I carried by the circuit 18. In some configurations, the circuit 62 I/o contain only the circuit input and the circuit is configured to only accept data input from circuit 18 process control. The microcontroller 60 may be relatively simple scheme, which is configured to store some or all of the data received from circuit 18, in the memory 64. Record the data collected from loop 18 may be based on the start, for example, a particular type of data or events that are taken from the circuit 18 is run periodically or triggered in some time. For example, clock 66 associated with the microcontroller 60 may be used to provide the microcontroller with the time information. This time information can be used in some configurations to control the writing of data in the memory 64. In addition, if recorded the data marked with the time and a real time clock, these data can subsequently be compared with other operations in the loop process control during this time to identify some problem in the circuit 18.

Memory 64 may be any appropriate type of memory. Preferably, the memory 64 is a nonvolatile memory that the control device 8 may be disconnected from the energy source without losing data stored in memory 64.

Figure 3 is a block diagram 80 illustrating an exemplary operation of the control device 8 of the process of this invention. Originally, provides additional unit 82 starts. Additional block 82 start-up can be used to trigger data capture. For example, the data capture can be initiated at some time, periodically or based on some other event. In block 84 accepted data path 18 process control. Another additional unit 86 run can be used to determine whether to record the collected data. For example, the received data can be initiated to determine whether they have the type required for recording, for example, from device-specific process or a specific data type. Additional block 86, if the run is not enabled, then control may be transferred back to block 84 (or additional block 82). With the another hand, if start is activated, control is passed to the secondary filter 86 data. Additional filter 86 data can be used to selectively filter the type of data that will be recorded. For example, extraneous data received from the control loop process, such as additional headers, etc. can be removed from the data if you want to save space in memory 64. Additional timestamp may be provided in block 90. The timestamp can be generated from clock 66, shown in figure 2, and can be real-time data, or may be some type of relative time. In block 92 the data stored in memory 64, and the control proceeds to optional block 94. If the additional unit 94 does not exist, then control may return to block 84 (or additional block 82). Additional block 94 determines whether to continue recording data. This determination may be based on any appropriate criteria, such as time, number of recorded data points, the amount of space remaining in the memory 64, etc. If the recording should be continued, then control passes back to block 84 (or additional block 82). On the other hand, if the write data has to be stopped, then control passes to block 96.

Some configuration is the Nations record data can be controlled, for example, by sending commands to the control device 8 contour contour 18 of the management process. In one embodiment, aspects of the flowchart shown in figure 3, can be configured. For example, the runs of 82 and 86 can be customized, as well as the filter 88 data and the timestamp 90. Can be custom value of recorded data, the recording rate (for example, a record of each of the n-th messages received by the circuit 18)whether to clear the memory, etc. Another example of the custom setting is whether the memory is cyclic, so old entries over time are overwritten with new data.

Once the desired amount of data has been stored in the memory 64, or some other period, these data are collected by service personnel for evaluation. Data collection can be carried out in any appropriate manner. Data can be downloaded from the circuit 18 process control or via an additional connection 70 of the I/o data shown in figure 2. For example, the connection 70 of the I/o data can be a connector in accordance with a known standard, such as RS232, USB, etc. In another example, the connection 70 of the I/o data can be used to access the microcontroller 60 and its programming, for example, to control how data is written, the parameters associated with such account. In another example, the input/output uses a method of wireless communication, such as using radio frequency (RF), inductive coupling, sound communication, optical communication, etc. the Control device 8 of the process optionally may be removed from the production conditions and returned to service location for evaluation. In another example, the memory 64 is carried in a removable module so that it can be removed from the control device 8 of the process. For example, end cap, shown in figure 2, may be removed from the housing 50 to enable access memory 64. The memory may contain a standardized removable module, such as a compact flash memory, secure digital card, etc.

Figure 4 is a block diagram 100 showing steps associated with the restoration of stored data. In block 102, the data stored in the memory 64 are retrieved by any appropriate method. Then in block 104, the stored data are investigated. For example, data may be compared with other data, to be compared with the known valid data, etc. On the basis of this study, in block 106, the system is diagnosed, for example, to identify network errors or other problems in the control loop process.

Although this invention has been described with reference to preferred the option exercise, specialists in the art it will be clear that there may be changes in form and detail, without going beyond the nature and scope of the invention. In one particular embodiment, the control device does not contain any element of the interface process, such as a sensor or control. The control device of the circuit can be implemented in the host device of the type used to configure other devices on the loop control process. The host device may be implemented in PCs, handheld devices and other devices. In this configuration, the device 8 includes a host device and circuit 62 I/o (see figure 2) is used to send commands to the configuration to the devices on the loop 18.

1. The control device of the control loop process, containing:
the casing is fixed in the field, configured to mount in the actions pane control system or control the production process, the case contains:
diagram of the interface circuit process control in fixed field housing, configured to connect with loop process control and receive data from the control loop process; and
memory in fixed field housing, configured the th writable data the adopted scheme of the interface from the control loop process, and the recorded data are for later retrieval for use in diagnosing; and
data connection configured to provide the recorded data to an external device for use in diagnosing, in accordance with the data recorded in the field device and then provide an external diagnostic device.

2. The device according to claim 1, in which the circuit of the interface circuit control process configured to connect with a two-wire loop process control.

3. The device according to claim 1, in which the control device of the control loop process is supplied with energy, adopted from a path control process.

4. The device according to claim 1, in which the control loop process transfers data in accordance with the Fieldbus communication standard.

5. The device according to claim 1, wherein the connection data includes a wireless connection.

6. The device according to claim 1, which includes watches in fixed field case.

7. The device according to claim 6, in which the data is stored in memory that is marked with time information from the clock.

8. The device according to claim 6, in which the watch contains a real time clock.

9. The device according to claim 1, in which fixed in polivy the conditions of the housing configured to mount to the standard connections in control systems or process control.

10. The device according to claim 1, comprising a microcontroller in fixed field housing, configured to write data into memory.

11. The device according to claim 10, in which the microcontroller includes a trigger configured to start recording data.

12. The device according to claim 10, in which the microcontroller is configured to filter the data received from the control loop process, before storing the data in memory.

13. The device according to claim 1, in which the older data stored in the memory, replaced by newer data.

14. The device according to claim 1, including a connection with a fixed field housing, configured to retrieve data from memory.

15. The device according to claim 1, including a connection with a fixed field housing, configured to control parameters of the data record.

16. A method for diagnosing operation of the control loop process that is used in the control system or control process, containing:
(a) connecting diagram of the interface circuit in the fixed field control device circuit to the control loop process in a field location;
(b) receiving data in the fixed field control device circuit from pin the RA process control;
(c) recording the received data in the memory in the fixed field control device loop;
(d) repeating steps (b) and (C); and
(e) retrieving the recorded data from the fixed field of the control device circuit external device;
(f) diagnosing the operations of the control loop process based on the recorded data to an external device, the data recorded in the field device and then provide an external diagnostic device.

17. The method according to clause 16, which includes diagnosis of control loop process based on the extracted data recorded.

18. The method according to clause 16, in which the control loop process includes a two-wire loop process control.

19. The method according to clause 16, in which the control loop process transfers data in accordance with the Fieldbus communication standard.

20. The method according to clause 16, which includes removing a memory of the control device circuit mounted in the field.

21. The method according to clause 16, which includes the implementation of time stamping of recorded data.

22. The method according to clause 16, which includes attaching the control circuit device mounted in the field, to the standardized connection in control systems and process control.

23. The method according to clause 16, which includes the write data as the PE the work to start.

24. The method according to clause 16, which includes filtering the data received from the control loop process to write data into memory.

25. The control device of the control loop process, fixed field containing:
diagram of the interface circuit of the control process in the fixed field of the control device of the control loop process that is configured to connect to the control loop process in a field location and receive data from the control loop process;
memory in fixed field control device of the control loop process, configured to write data received by the interface circuit from the control circuit process, the recorded data are used for further extraction for use in the implementation of the diagnosis; and
in which the interface circuit loop process control is additionally configured to send configuration commands to other field devices connected to the control loop process, in order thereby to configure other field devices.



 

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