JP2985274B2 - Sequencer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a sequencer system used in the field of factory automation and the like, and more specifically, an access method between an upper main processor and a lower I / O module. Is to improve.

<Prior Art> An example of a sequencer system is a system as shown in a block diagram of FIG.

In this example, a system is provided with a main processor 10 at an upper level and an intelligent I / O module 20 at a lower level.The main processor 10 has a basic program processing unit 11 for executing a basic program, and a A ladder program processing unit 12 for executing a ladder program is provided, and a basic program or a ladder program is selectively used depending on a control purpose.

The following method is used to access the I / O module 20 from the main processor 10.

Basic program processing unit 11 to I / O module 2
To access 0, the processing unit 11 issues an access request to the standard driver 13, and the standard I / O service unit 131 in the standard driver 13 sends the standard interface / The processing request is written into the memory 21. On the other hand, the module processor 22 in the I / O module 20 uses the standard interface memory
The flag in the memory 21 is checked, and when a processing request is detected, the operation is performed in accordance with the contents of the standard interface memory 21.

In order to access the I / O module 20 from the ladder program processing unit 12, the contents of the refresh memory of the main processor 10 are written into the standard interface memory 21 at the timing of the I / O scan.

<Problem to be Solved by the Invention> According to the conventional access method as described above, the lower I / O
The O module 20 cannot operate unless a basic program or a ladder program is interposed on the main processor 10 side.
Since it is not possible to issue a processing request to the processor 10, the program load, start, stop, save, and I / O from the I / O module 20 to the main processor 10
O Reading / writing etc. could not be performed.

An object of the present invention is to solve the above-described problems, and to obtain information of a higher-level main processor from a lower-level I / O module without passing through a higher-level basic program or a ladder program. The purpose is to do.

<Means for Solving the Problems> The present invention that has solved the above problems controls a processing unit that executes a basic program, a processing unit that executes a ladder program, and an I / O module that is connected to a lower level. A main processor having a standard driver that performs processing, a processing request from the standard driver or the ladder
A sequencer system comprising: a standard interface memory accessed at a timing of an I / O scan of a program; and an I / O module having a module processor for controlling the module. The driver includes a standard I / O service unit for issuing an operation request to the I / O module, a link information service unit for processing an operation request from the I / O module side, and activation and termination interrupt processing for these processes. And a link interface memory for storing information from the link information service unit or various service information from the ladder program in the I / O module.・ It is a system.

<Operation> The operation of the sequencer system of the present invention is as follows.

Access from the upper main processor to the lower I / O modules remains the same as in the conventional method, and the module processor in the I / O module communicates with the basic program on the main processor via the link interface memory. , Ladder program information, internal data, I / O information, and upload / load / download programs.

<Embodiment> An embodiment of the sequencer system of the present invention will be described below with reference to the block diagram of FIG.

In FIG. 1, components having the same reference numerals as those of the conventional system in FIG. 2 have the same functions, and a high-level computer link module is assumed as the I / O module 20.

The feature of the present invention is that a link information service unit 143 is added to the standard driver 14 installed in the main processor 10 in addition to the standard I / O service unit 141 and the interrupt processing routine 142 as in the related art. The point is that a link interface memory 23 is provided inside the module 20. In addition, I / O
The communication processing unit 24 provided inside the module 20 performs external communication (RS
232C, RS422, etc.).

To explain the standard driver 14 in detail, the standard I / O
The service unit 141 is the basic program processing unit 11 to I
Used when accessing the / O module 20, the interrupt processing routine 142 determines whether the interrupt from the I / O module 20 is for the standard I / O service unit 141 or the link information service unit 142, and In response to a request from the I / O module 20, the service unit 143 instructs the basic program processing unit 11 or the ladder program 12 to perform service processing such as stopping and starting a program, and reading / writing basic common variables.

The link interface memory 23 of the I / O module 20 stores the link information service section of the main processor 10.
143 or bits from ladder program processing unit 12
It stores an interface for data read / write service.

The operation of the system of the present invention thus configured will be described below.

Normally, when the main processor 10 accesses the I / O module 20 and accesses it from the basic program processing unit 11, the main processor 10 transmits the I / O module 10 via the standard I / O service unit 141 in the standard driver 14. Of the standard interface memory 21 or an operation of performing a reading process.

On the other hand, the communication processing section 24 of the I / O module 20 includes a start, stop, upload / load, and basic program of an external basic program or ladder program.
Requests for reading / writing common variables, reading status / error information, reading / writing ladder variables, and the like are given.

When the module processor 22 receives the above request and determines that the reading / writing of the ladder variable to the ladder program processing unit 12 is to be performed, the module processor 22 uses the link interface memory 23 to execute the main processor 10. Issues a data update request to the main processor 10
Obtains necessary data from the link interface memory 23 in an I / O scan cycle.

For other requirements, see Module Processor 22
Sends a processing request to the link information service unit 143 in the standard driver 14 using the link interface memory 23.

This processing request is timed by an interrupt.
In addition to the above, for example, when notifying a processing end command in response to a processing request from the main processor 10 to the I / O module 20 side, the processing is performed at the interrupt timing. Is done.

The link information service unit 143 of the main processor 10 reads the link interface memory 23 when the interrupt is given, and responds to the request to read the basic interface memory 23.
Program processing unit 11 or ladder / program processing unit 12
To realize the above-mentioned request.

As the I / O module as described above, for example, a CRT interface module can be considered in addition to the above-described personal computer link module.

That is, the communication processing unit 24 corresponds to a controller for the CRT interface, and the I / O module 20 stores the data to be embedded in the displayed monitor screen or the like in the basic program processing unit 11 or the ladder program processing of the main processor 10. Link interface memory from part 12
23, and displays the data as it is on a part of the screen as it is, or performs processing such as graphing, plotting, etc., and displaying the processed data.

In other words, even if the basic program processing unit 11 or the ladder program processing unit 12 of the main processor 10 does not access the I / O module 20 (CRT interface module), The data in the main processor 10 can be obtained. That is, a basic or ladder CR
The system related to display-related processing can be upgraded without creating a display program.

<Effects of the Invention> According to the system of the present invention, the following effects are obtained.

Information in the basic program or ladder program can be obtained from the I / O module side via the link interface memory, and the program can be uploaded / downloaded, and the lower I / O
Information on the upper main processor can be obtained from the module.

Further, even if a basic or ladder program is not created for the I / O module, the operation of the I / O module is not affected. Furthermore, host computer link module, CRT
It can be used for various networks besides the interface module.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a sequencer system embodying the present invention, and FIG. 2 is a configuration blog diagram showing a conventional sequencer system. 10: Main processor, 11: Basic program processing unit, 12: Ladder program processing unit, 13 ...
Standard driver, 131: Standard I / O service unit, 132: Interrupt processing routine, 14: Standard driver, 141: Standard I / O service unit, 142: Interrupt processing routine, 143: Link information service unit , 20 ... I / O module, 21 ... Standard interface memory, 22 ... Module processor, 23 ... Link interface memory, 24 ... Communication processing unit.

Claims (1)

(57) [Claims] A main processor having a processing unit for executing a basic program, a processing unit for executing a ladder program, and a standard driver for controlling an I / O module connected to a lower level; A standard interface memory accessed at the timing of a processing request from the I / O scan of the ladder program, and an I / O module having a module processor for controlling the module, a sequencer system comprising: The standard driver in the main processor has
A standard I / O service unit for issuing an operation request to the I / O module, a link information service unit for processing the operation request from the I / O module, and an interrupt processing unit for starting and terminating these processes And a link interface memory for storing information from the link information service unit or various service information from the ladder program in the I / O module.