JP2000010604A - Digital controller in plant control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fetch the event input function of an event recorder in the hierarchical structure of a CPU-I/O inside a process control computer by reading event data stored in a dedicated memory synchronously with the clock of a CPU module on the side of the process computer. SOLUTION: At an event input signal processing part 11, input signal processing is performed on various event data generated at a plant by the CPU module of a plant computer. Afterwards, these data are temporarily stored in a dedicated memory 10 after the time stamp of the generation time is affixed by a CPU 9 performing arithmetic processing at high speed inside a module 8. Then, a CPU module 4 of a process computer 2C is controlled not by a reference clock in the event module 8 but by the clock of the same cycle as the CPU module 4 of other process control computers 2A and 2B. Therefore, even the event input module 8 is accessed by the method and cycle similar to the process control and event data are read out of the dedicated memory 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital controller in a plant control system for performing process control while collecting high-speed data with time data, and more particularly to a means for collecting high-speed data with time data (event record) in plant control. The present invention relates to a digital control device in a plant control system configured to be easily incorporated in a process control device.

[0002]

2. Description of the Related Art FIG. 2 shows a system configuration of a digital control device in a conventional plant control system incorporating an event recorder (a device for collecting high-speed data with time data).

[0003] Reference numeral 1 denotes a unit computer that performs overall control and monitoring of the entire plant, and 2 denotes a process control computer that performs digital control of each process 20. The inside of the process control computer 2 is modularized for each function, and the I / O module 5 performs an input / output interface with the outside, that is, the process 20, and the C / C performs a control operation based on the input / output signals.
The PU module 4 includes a bus signal line 21 (data bus, address bus, control bus) connecting the two.

The data logger 6 stores and stores process data.
The management device performs data collection, printing of alarms and events, and the like. The above-described devices (units) are connected by a unit network 3 and transmit and receive data to and from each other.

[0005] The event recorder 7 incorporated in the present control device is a device for recording or storing the operation of various facilities and equipment during plant operation and the event (event data) at the time of occurrence abnormality together with the time of occurrence. The obtained data is used for analyzing the operation of the plant and analyzing the abnormality. Therefore, the CP of the digital controller in the system constituted by the unit computer 1 and the process control computer 2 is used.
The operation cycle of the U module is several tens to several hundreds of milliseconds, whereas the event recorder 7 requires a high time resolution, such as when different events occur consecutively. is necessary.

Therefore, in the prior art, a device dedicated to an event record for performing high-speed data collection processing is installed completely separately from the process control computer 2 whose operation cycle is slower than that of the event recorder 7, and a data logger 6 is provided. And a local bus 22 is configured between the two.

[0007]

However, providing a device dedicated to event records and constructing the local bus 22 with the data logger 6 completely separately from the process control computer 2 requires only equipment costs. In addition, new design elements such as communication with other devices have arisen, which has resulted in high costs.

In view of the problems of the prior art, the present invention incorporates the event input function of the event recorder into the hierarchical structure of the CPU-I / O in the process control computer. It is an object of the present invention to provide a digital control device in a plant control system that can eliminate factors that cause generation of a large design element and high cost.

[0009]

According to the first aspect of the present invention,
In a digital control device in a plant control system that performs process control while collecting high-speed data with time data (hereinafter referred to as event data), a high-speed operation processing unit that performs operation processing of the event data is a CP.
U, a dedicated memory and an input module, are modularized as an event module, and the module is configured in a hierarchical structure with the CPU module of one process computer, and event data on the process side is stored in the event module. After being fetched via the input processing unit and processed at high speed by the CPU in the module, the event data is temporarily stored in the dedicated memory, and the event data stored in the dedicated memory can be read out in synchronization with the clock of the CPU module on the process computer side. A plant control device for controlling the input of event data into a hierarchical structure of a CPU module and an I / O module in another process control computer for digitally controlling each process. A digital controller in the system is proposed.

According to this device, the high-speed operation processing unit (event recorder) for performing the operation processing of the event data is modularized as an event module including a CPU, a dedicated memory, and an input processing unit. It is fetched via the input processing unit of the event module, and several mse
High-speed c-cycle high-speed operation (high-speed processing) can be performed.

Also, since the event data is taken into the dedicated memory from the input processing unit of the event module and the event data stored in the dedicated memory is read out in synchronization with the clock of the CPU module on the process computer side. In addition, a hierarchical structure can be formed between the module and a CPU module of one process computer. As a result, the one process computer, the unit computer, and the other process control computers can perform arithmetic operations in the same cycle with each CPU module having an arithmetic cycle of several tens to several hundreds msec. They are connected via a unit network and can transmit and receive data to and from each other.

Therefore, according to the present invention, the function of the event input of the event recorder is provided by the CP in the process control computer.
It can be incorporated in the hierarchical structure of the UI / O, thereby eliminating the above-mentioned disadvantages of the prior art, that is, the generation of new design elements and the factor of increasing cost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, unless otherwise specified, dimensions, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the invention, but are merely illustrative examples.

FIG. 1 is a system configuration diagram of a digital control device in a plant control system according to an embodiment of the present invention. 1 is a unit computer for controlling and monitoring the entire plant, 2A and 2B are process control computers for digitally controlling each process 20, and 2C is a process computer incorporating an event input module. The data logger 6 is a device for storing and managing process data as described in the above-mentioned prior art, and performs data collection, alarm / event printing, and the like.

The process control computers 2A and 2B are internally modularized for each function, similarly to the above-mentioned prior art.
It comprises an I / O module 5 for performing an input / output interface with the outside, that is, the process 20, a CPU module 4 for performing a control operation based on the input / output signals, and a bus signal line 21 connecting the two.

The process computer 2 C incorporating the event recorder function comprises a CPU module 4 and one or more event input modules 8 controlled via the CPU module 4 and a bus signal line 21.

Therefore, in the present embodiment, the event recorder has a function of collecting high-speed event data, and is a process computer 2C as one event input module 8.
And placed in the same hierarchy as the other I / O modules 5. On the other hand, when viewed from the CPU module 4 of the process computer 2C, the event input module 8 is, like the I / O module 5 incorporated in the other process control computers 2A and 2B, all of the computers 2A to 2C. C
Control is performed based on the control clock of the PU module 4 and data access is performed in the same manner as the other I / O modules 5 and at the same control clock cycle.

Instead of the event recorder having a local bus configuration independent of the unit network 3 as in the prior art, other process control computers 2A and 2B including a process computer 2C incorporating an event input module 8 are provided. , The data logger 6, and the unit computer 1 are connected by a unit network 3, and are configured to transmit and receive data to and from each other.

The event input module 8 includes a CPU 9 for performing various controls such as input / output management of high-speed event data and time management, a dedicated memory 10 for temporarily storing event data together with event occurrence time data (time stamp), and the CPU 9. From the input signal processing unit 11.

In some cases, a plurality of event input modules 8 are provided according to the number of event data to be collected. In this case, in order to match the overall time, the time is periodically set based on a clock reference from itself or from outside. It is better to make adjustments. For example, in FIG. 1, the process computer 2C
The configuration is such that the time of each event input module 8 is periodically adjusted based on a reference clock CL attached to the CPU module 4.

Next, the operation of the above configuration will be described. Various event data generated in the plant A are input signal processed by the input signal processing unit 11 in the event input module 8 under the control of the CPU module of the plant computer.
After the time stamp of the occurrence time is given by the management of the PU 9, it is temporarily stored in its own dedicated memory 10.

CPU module 4 of process computer 2C
Is controlled not by the reference clock in the event input module 8 but by the clock of the same cycle as the CPU module 4 of the other process control computers 2A and 2B, so that the I / O module of the other control computers 2A and 2B 5, the event input module 8 is also accessed at the same period, and the event data with the time stamp is stored in the dedicated memory 1 in the event input module 8.
0 can be read.

As a result, the operation cycle is several tens to several hundreds msec.
Is handled in the same manner as input / output data of other I / O modules 5 by the CPU module 4 of the process computer 2C.
Event data that occurs at high speed can be collected and managed. The event data input module 8 is a general I
Since it is on the same level as the / O module 5, it can be easily expanded, and can flexibly cope with plants with different numbers of event inputs by increasing or decreasing the number of modules.

[0024]

As described above, according to the present invention, the function of the event input of the event recorder can be incorporated into the hierarchical structure of the CPU-I / O in the process control computer. That is, it is possible to eliminate factors that generate new design elements and increase costs.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a digital control device in a plant control system according to an embodiment of the present invention.

FIG. 2 shows a system configuration of a digital control device in a conventional plant control, and particularly shows a position of an event recorder therein.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unit computer 2A, 2B Process control computer 2C Process computer 6 Data logger 5 I / O module 4 CPU module 8 Event input module 21 Bus signal line

Claims (1)

[Claims] 1. A digital control device in a plant control system for performing a process control while collecting high-speed data with time data (hereinafter, referred to as event data), wherein a high-speed operation processing unit for performing an operation process of the event data includes a CPU and a dedicated memory. And an event module including an input processing unit, the module is configured as a hierarchical structure with the CPU module of one process computer, and the event data on the process side is transmitted to the input processing unit of the event module. Through the C in the module
After high-speed processing by the PU, the event data stored in the dedicated memory is temporarily stored in the dedicated memory, and the event data stored in the dedicated memory can be read out in synchronization with the clock of the CPU module on the process computer side. CP in another process control computer that performs digital control of the process
A digital control device in a plant control system, wherein the digital control device is configured to be incorporated in a hierarchical structure of a U module and an I / O module.