JPH0792783B2 - IO module control system - Google Patents

Description

The present invention relates to an IO module control system, and more particularly to an IO module control system capable of being connected to processors having different word configurations.

[Conventional technology]

PMC (Programmable Machine Controller)
The IO module is used for exchanging signals with the outside. IO module has input circuit and output circuit, these are PMC
It is configured according to the word configuration of the processor (programmable machine controller).

[Problems to be solved by the invention]

However, there are two types of word configurations for commonly used microprocessors. This word structure is shown in FIGS. 3 (a) and 3 (b). In the word configuration of the processor shown in FIG. 3A, the address n has a lower byte and the address (n + 1) has a higher byte. Third
In the word configuration of the processor shown in FIG.
At the address (n + 1) and the lower byte at address (n + 1).

Therefore, if you combine an IO module configured for one processor with the system of the other processor,
A problem occurs in data transfer. Also, for each processor
Creating an IO module has a problem in that there are two types of IO modules.

An object of the present invention is to solve the above problems and provide an IO module control system that can be connected to processors having different word configurations.

[Means for solving problems]

In the present invention, in order to solve the above problems, in an IO module control method for controlling data transfer of an IO module used in a PMC (Programmable Machine Controller), an allocation table for determining the unit and order of the data transfer. An IO module control system is provided, in which the allocation table is provided with information for exchanging the upper byte and the lower byte, and the word configuration is converted at the time of data transfer.

[Action]

Even if the system processor to which the data of the IO module is transferred is different, the data is converted by the information for replacing the upper byte and the lower byte in the allocation table that determines the unit and order of data transfer. Even IO modules that match the word configuration of the processor can be directly connected to the system configured with other processors.

〔Example〕

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

FIG. 1 shows a block diagram of an embodiment of the present invention. In the figure, 1 is a processor that controls the whole, and 2 is a bus control circuit that arbitrates the use of the bus and performs DMA control. Three
Is a ROM in which the management program 3a and the sequence program 3b are written. Reference numeral 4 denotes a RAM, which stores input data and various data to be arithmetically processed.
This RAM can also be shared with the connected CNC.

Reference numeral 5 is an IO unit, which is an allocation table 5a and conversion means 5b.
Have. Although 6 and 7 are IO modules, a large number of IO modules are connected in an actual system, but here, for simplification, only two IO modules will be described. The IO unit 5 transfers and manages data to the IO modules 6 and 7. The allocation table 5a has data such as the arrangement of the IO modules 6 and 7 and the type of module. This allocation data is written in the management program 3a or the sequence program 3b, transferred to the IO unit 5 when the power is turned on, and stored in the allocation table 5a. Further, the allocation table 5a has information as to whether or not the word configurations of the IO modules 6 and 7 are the same as those of the processor 1, and when they are different, the data conversion is performed by the conversion means 5b. Here, the word configurations of the IO modules 6 and 7 and the processor 1 are different.

FIG. 2 shows a conceptual diagram of an example of this conversion. In the figure,
5 is an IO unit, and 6 and 7 are IO modules. 5c, 5d, 6a and 7a indicate data to be transferred. Here, it is assumed that each of the IO modules 6 and 7 has 2-byte data, and transfers this to the RAM 4 or the like via the IO unit 5. The numerical values of the data 5c, 5d, 6a, and 7a indicate 1-byte data. Reference numeral 8 is allocation data in the allocation table 5a. Here, the data of the IO modules 6 and 7 are allocated so that the upper byte and the lower byte are exchanged as shown in the figure.

The data of the IO modules 6 and 7 is directly transferred to the RAM 4 by the bus control circuit 2 and arithmetic processing is performed in the RAM 4, and the result is further output via the IO unit 5 for output IO (not shown). It is output to the module.

Therefore, even if the word configurations of the IO modules 6 and 7 and the processor 1 are different, the data is converted into the word configuration of the processor 1 and transferred in the IO unit 5, so that if there is one type of IO module, another word is used. It can also be connected to a system of configured processors.

〔The invention's effect〕

As described above, according to the present invention, the allocation table that determines the unit and level of data transfer is configured to convert data according to the information for exchanging the upper byte and the lower byte. Even in the configured system, the same IO module can be used, the product series can be unified, and management is easy.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a conceptual diagram of word configuration conversion, and FIGS. 3 (a) and 3 (b) are diagrams showing word configurations of two types of processors. 1 ... Processor 2 ... Bus control circuit 3 ... ROM 4 ... RAM 5 ... IO unit 5a ... Allocation table 5b ... Conversion means 6 ... IO module 7 ... IO module 8 ... Allocation data

Claims (1)

[Claims] 1. An IO module control method for controlling data transfer of an IO module used in a PMC (Programmable Machine Controller), wherein an allocation table for determining a unit and order of the data transfer is provided, and an upper table is provided in the allocation table. An IO module control method characterized in that it is configured to convert the word configuration during data transfer, including the information that swaps bytes and lower bytes.