JP3208143B2 - Input / output controller of power controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Object of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input / output controller for a digital power controller.

[0003]

2. Description of the Related Art As a plant interface of a power control device, there are an input signal from a sensor or the like and an output signal to an actuator or the like. These input / output controls are roughly classified into two types: an event type in which calculation and input / output are performed cyclically in response to a change in an input signal. This depends on the application of the device. For example, if the input / output cycle including calculations is sufficiently fast with respect to the response required for plant operation, a cyclic type is used because of the ease of program design. on the other hand,
If dynamic data processing is required in various ways, responsiveness is required, and instantaneous changes cannot be overlooked, it becomes an event type.

[0004] These two modes of operation are contradictory, but recently there has been an increasing need to use these two modes in combination. For example, it operates in the normal event mode, but scans input data faster than usual for analysis at the time of a plant accident (1 to 10 ms
c) storing data, especially digital inputs, and retrieving the data when necessary. In this case, it is essential to add time to the data. If the time is not attached, it is not possible to know the data at the time when the data is taken out.

[0005]

In the prior art, it is difficult to meet such needs with one device, and an event recorder having a function of inputting and storing plant information is installed separately from a control device. When necessary, the data of the event recorder is taken out using a communication means or the like in the control device. In this method, a dedicated device is separately provided, and cable work is involved, so that the cost is increased.

Therefore, conventionally, for example, as shown in FIG. 5, there has been known a power control device in which a high-speed scanner function for input is incorporated in a central processing unit of the control device.

In this conventional power control device, a central processing unit 10 and a plurality of input / output units 11 are provided.
The units are connected by an internal bus 12. The central processing unit 16 is connected to the input / output unit 1 via a control module (a functional module such as an extended memory or communication control) 18 using a bus or a bus buffer 19.
1 to control the digital output 15 and the analog input 14,
Data exchange and calculation. The scanner 17 is
The bus release request a is output to the central processing unit 16 at every predetermined scan time, and the digital input 13 is accessed via the bus buffer 19 after receiving the Ack signal b.

In this conventional method, two different operation modes are supported in one device, but the central processing unit 16
In, the release time of the bus becomes very long as the bus is released within an extremely short time, and the number of access points increases, the data exchange with other modules is awaited, and the scan data processing is also required. There was a problem in the point.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. The object of the present invention is to support different operation modes of cyclic input and event for access to digital input, to detect a state change, and to add time data. Another object of the present invention is to provide an input / output controller of a power control device having an inexpensive input / output control method and means capable of performing input / output services other than digital input, and which does not load the central processing unit.

[0010]

Configuration of the Invention

[0011]

An input / output controller of a power control apparatus according to the present invention is connected to a central processing unit for controlling power of a plant via an internal bus, and controls an input / output module. I / O controller that performs
The central operation through the internal bus
Communication with the unit, from the central processing unit
A main that inputs and processes signals related to the status of the plant
A sub-operation unit, wherein the sub-operation unit includes:
From the central processing unit through the internal bus
Digital about the state of the plant at regular intervals
Input data and detect significant changes in the input data
If the time is added to the input data,
Having a function of performing digital input processing for transferring to the
The main processing unit is configured to output the interface from the central processing unit.
Analog bus to the plant
And a function for inputting and processing the
Receive the transferred data, edit it and
Communication with the central processing unit via a bus.
It has at least .

[0012]

FIG. 1 shows an example of the configuration of a power control device, which comprises a central processing unit 10 and a plurality of input / output units 11, and each unit is connected by an internal bus 12. As shown in FIG. 2, the input / output unit 11 has an internal bus interface 5 and is mounted with an input / output controller 1 for controlling various input / output modules 13, 14, 15. FIG. 2 is an internal block diagram of the input / output controller 1. The input / output controller 1 includes an internal bus interface 5, a main processing unit (microprocessor and memory) 2 for performing management, control and services other than digital input of the entire module, and a sub processing unit for executing digital input dedicated processing. 3, a shared memory 4 for data communication between the arithmetic units 2, 3, an input / output module interface unit 8 for controlling an input / output module via a PIO bus, and access from the arithmetic units 2, 3. And a changeover switch circuit section 7.

The sub-operation unit 3 previously receives parameters such as original data of time, presence / absence of digital input, mounting data when there is a digital input, scan time, etc. from the main operation unit 2 via the shared memory 4 at the time of initialization. And it operates according to this parameter. When the digital input 13 is present, a predetermined scan time is counted, and at this time, a PIO bus release request is output to the main processing unit 2, and after waiting for a response, the I / O module interface unit 8 is accessed. . The input data is compared with the stored previous value, and if there is a change, the main arithmetic unit 2 is notified. It also has a function of updating the time, and notifies the main arithmetic unit 2 of the time added as saved data.

While the sub-operation unit 3 is executing the processing of the digital input 13, the main operation unit 2 performs data communication with the central processing unit 10 in parallel with other data processing such as filtering of analog signals and other operations. I do. If there is a data transfer request from the sub-processing unit 3, it is received, edited, and transferred to the central processing unit 10.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows an example of a program configuration of the input / output controller according to one embodiment of the present invention.

The program of the input / output controller 1 includes an initialization routine 20 for initializing and diagnosing the program, a scheduler 21 for controlling the operation of each task, and a constant period controlled by the scheduler 21 for controlling the execution of the program. A periodic task 22 for performing diagnosis and periodic input / output processing; a data editing task 23 for receiving input / output commands from the central processing unit 10 and performing data communication with the central processing unit 10 when a state change is detected; 3, a data editing task 24 that receives and edits data when a state change is detected, and interrupts such as a data reception interrupt from the sub-operation unit 3, a data reception interrupt from the central processing unit 10, and a timer interrupt. Interrupt processing routine 2 for performing interrupt processing
5 and a sub-operation unit internal program 26 for performing a digital input and detecting a state change.

Next, the operation of this embodiment will be described.

FIG. 4 is a series of flowcharts of the digital input 13 in the above embodiment. The overall input / output processing is as follows.

The initialization routine 20 is a routine for initializing this program. After the memory is cleared to "0" and a write / read check of the memory is performed as an initial diagnosis, a mounting board for constituting the input / output unit 11 is executed. Information, parameters, and the like are received from the central processing unit 10 via the internal bus 12, and tables and the like for data editing are created. In addition, the information is transmitted via the memory 4 which shares parameters such as the presence or absence of the digital input 13, information on the mounting board, and feeling of scanning.

When the initialization is completed, the scheduler 21 is started. The scheduler 21 includes a periodic task 22, a data transmission task 23, and a data editing task 2.
4. The start conditions are determined, and each of them is started when the start condition is satisfied.

The fixed-period task 22 is started at a fixed period, and performs input / output processing other than the digital input 13 and execution of a fixed-period diagnosis. When the PIO bus is switched to the sub-operation unit 3, processing such as data editing other than input / output processing is performed.

The data transmission task 23 processes input / output commands from the central processing unit 10 to the main processing unit 2 and transmits execution results and end status of input / output commands from the main processing unit 2 to the central processing unit 10. Execute
Further, it notifies the central processing unit 10 of the state change data detected by the sub-processing unit 2 spontaneously.

The data editing task 24 performs an editing process of dividing input data into a designated bit length and adding a serial number added from the beginning when data is transferred from the sub-processing unit 3 to the central processing unit 10. Transmission task 23
Is notified to the scheduler 21 and requests the central processing unit 10 to transfer data.

The interrupt processing routine 25 includes a fixed-period timer interrupt (although not shown, an interrupt controller is incorporated in the main processing unit 2 to determine an interrupt factor), and an internal bus. The main processing unit 2 is activated by a data reception interrupt from the central processing unit 10 and an interrupt from the sub-processing unit 3, and interrupts the process currently being executed by the main processing unit 2 to perform an interrupt process.

The fixed-period timer interrupt processing is performed by the internal timer No. 1 (although not shown, the main arithmetic unit 2 has a built-in timer, one of which is referred to as an internal timer No. 1). The start of the periodic task 22 is notified to the scheduler 21.

The data reception interrupt processing from the central processing unit 10 via the internal bus 12 prepares the transfer of the received data to the data transmission task 23, and then activates the data transmission task 23 to the scheduler 21. Notice. Also, at the time of data reception interrupt from the central processing unit 10 via the internal bus 12, the internal timer No. is hardened. 2 (not shown, the main arithmetic unit 2 has a built-in timer,
One of the internal timer Nos. 2) is started,
If the received data is time data, the internal timer No. is used when setting the time. 2 is read, and the delay of the receiving process is corrected to eliminate the error between the time of the central processing unit 10 and the time of the main processing unit 2.

The interrupt processing from the sub-operation unit 3 includes a request for switching the right to use the PIO bus to the sub-operation unit 3 and an input processing end notification. At the time of the PIO bus usage right switching request, the main processing unit 2 is notified that the PIO bus is to be switched to the sub-processing unit 3, and the PIO bus is switched to the sub-processing unit 3. At the time of the input processing end interrupt of the sub-operation unit 3,
When the right to use the PIO bus is switched to the main operation unit 2 side and a state change is detected by the internal program 26 of the sub operation unit 3, the detected state change data is received via the shared memory 4 and the received data is edited. After preparation for transfer to the task 24, the start of the data editing task 24 is notified to the scheduler 21.

The internal program 26 of the sub-operation unit 3 sets the P based on the designated input scan time (1 to 10 msec).
A request for switching to the sub-operation unit 3 of the IO bus is made, an input process specified by a parameter is performed, the end of the input process is notified to the main operation unit 2, and if there is a state change compared with the previous value, Is notified to the main processing unit 2 via the shared memory 4. At this time, the axis at the time of detecting the state change is added to the state change detection data.

As described above, according to the present embodiment, the sub-operation unit 3 operates regardless of the operation state of the main operation unit 2.
The input processing can be performed in a fixed period at an accurate time, and the main processing unit 2 can perform other processing even while the sub processing unit 3 is performing the input processing.

Further, since data editing processing is also performed in the input / output controller 1, the load on the central processing unit 10 can be reduced.

[0032]

As described above , according to the present invention , the input data
Data cyclic input processing and event type processing.
This is performed by the sub-operation unit of the output controller,
Input processing other than digital input processing by the
Input data editing and analog signal input processing
By using the main processing unit of the Troller,
Reduce the load on the central processing unit that has performed the above processing
Can improve power control performance
be able to.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a power control device of the present invention.

FIG. 2 is an internal block diagram of an input / output controller according to one embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of a program configuration of an input / output controller according to an embodiment of the present invention.

FIG. 4 is a flowchart in one embodiment of the present invention.

FIG. 5 is a diagram illustrating a configuration example of a conventional power control device.

[Explanation of symbols]

 1 Input / output controller 2 Main operation unit 3 Sub operation unit 4 Shared memory 5 Internal bus interface 6 Time data correction unit 7 Access switch Circuit section 8: Input / output module interface section 9: Power control device 10: Central processing unit 11: Input / output unit 12: Inconal bus 13: Digital input 14: Analog Input 15 Digital output 16 Central processing unit 17 Scanner 18 Control module 19 Bus buffer 20 Initialization routine 21 Scheduler 22 Periodic task 23 ... Data transmission task 24 Data editing task 25 Interrupt processing routine 26 Sub-function Arithmetic unit internal program a: release request signal b: Ack signal

Continuation of the front page (56) References JP-A-62-298805 (JP, A) JP-A-2-79102 (JP, A) JP-A-2-226092 (JP, A) JP-A-2-212911 (JP) , A) JP-A-2-64720 (JP, A) JP-A-1-211159 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G05B 15/00-15/02

Claims (1)

(57) [Claims] An input / output module connected to a central processing unit for controlling power of a plant via an internal bus.
An input / output controller for controlling a module , wherein the input / output controller communicates with the central processing unit through the internal bus.
Communication is possible, and the plan is
Main processing unit that inputs and processes signals related to
And a sub-operation unit, wherein the sub-operation unit receives the input from the central processing unit.
The status of the plant at a fixed cycle through the external bus
Digital data relating to the
If an appropriate change is detected, the time is added to the input data.
Digital input processing to be transferred to the main
The main processing unit has a function of transmitting the input data from the central processing unit.
Information on the status of the plant via an internal bus
A function for inputting and processing a analog signal;
Receives and edits the transferred data from the
Function to communicate with the central processing unit through a null bus
An input / output controller for a power control device, comprising at least: