JPH01134504A - Transmission/reception system for programmable controller - Google Patents

Abstract

PURPOSE:To ensure the effective application of a programmable controller PC link area by dividing the link area of a large-scale PC based on the size of a small-scale PC with correspondence secured among those divided link areas. CONSTITUTION:A large-scale PC 11 is connected to small-scale PC 13, 15, 17, and 19 respectively and data are transferred among these PCs. A large-scale PC link area 12 is divided into blocks is response to the sizes of the small-scale PC link areas 14, 16 and 18 respectively. Then the codes are given to these divided blocks. Then the transfer of data is carried out with the corresponding small-scale PC based on the block codes. Thus it is possible to avoid such a case where the link area of the PC 11 is limited by the link area of the small- scale PC.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a transmission/reception system for programmable controllers (hereinafter referred to as PCs) that enable mutual data transmission and reception, and particularly to a PC link area of a large-scale PC.

(Conventional technology) FIG. 5 is a diagram showing a conventional PC network.

In the figure, (41) is a large-scale PC, (43).

(45) and (47) are small-scale PCs, which are connected to each other and configured to be able to send and receive data. (42), (44), (4B),
(48) each indicates the PC link area of the PC.

Since large-scale PC (41) uses large-scale Ilo and data, the word structure of the user program is also large, and naturally the large-scale P C that can be handled with that word structure is
It has a C link area (42).

On the other hand, small-scale PCs (43), (45), and (47) handle small-scale Ilo and data, and the word structure of the user program is also small from a cost-oriented perspective.
The PC link area (44), (46), (
4g) cannot handle large-scale PC link areas.

Such large-scale PC link areas (42) and small-scale PC link areas (44), (4B), (48
), the small PC link areas (44), (4G), (4g) are connected to each PC (
41), (43), (45).

Control area (41a) corresponding to (47),
(43a).

It has (45a) and (47a).

Generally, the control area is programmable and
By arbitrarily dividing the PC link area, each PC controls the 0N10FF control area according to the user program, and transmits it to the link area of other PCs, so that the PC link area can be divided into all PCs.
It is used as a data area common to C.

However, as mentioned above, in a link between a large-scale PC with a large-scale PC link area and a small-scale PC with a small-scale PC link area, the small-scale PC may receive data outside the scope of the CIJ sink clearer. Since it is not possible to send and receive data, a large-scale PC that sends and receives data to a small-scale PC (
The actual link area S of the PC link area (41) (42) was limited to the size of a small PC link area, and the PC link area (42) could not be used effectively.

The present invention was made to solve these problems, and aims to provide a PC data transmission/reception system that enables effective use of a large PC link area.

(Means and effects for solving the problem) The data transmission/reception method for a PC according to the present invention provides a PC link for a large-scale PC,
The query area is divided according to the size of the PC link area of the small PC, and each divided area and the P of the small PC are
The C link area is associated with the C link area, and data is exchanged between the two.

(Example) FIG. 1 is a diagram showing an embodiment of the present invention.

In the figure, (11) is a large-scale PC, (13), (1
5).

(17) and (19) are each small-scale PCs, and these PCs are interconnected to exchange data. (12) is the PC link area of large-scale PC (11).

(14), (1B), (18), and (20) are small-scale PCs (13), (15).

This is the link area of (17) and (19). The large-scale PC link area (12) is divided into blocks according to the size of the small-scale PC link areas (14), (16), and (1g), and a block code is assigned to each block.

PC link area A is for each PC (11), (1(),
(19) Control area (lla,
(13a) and (19a) as before. The same process can be performed for PC link areas B, C, and D, but is omitted in this embodiment.

FIG. 2 is a block diagram showing the hardware configuration of the large-scale PC (11). In the figure, (20) is a CPU.

(21) is a ROM in which a program defining the arithmetic operation of the CP IJ (20) is stored, and (22) is a RAM in which various data are stored. (24) is the I10 table where input data and output data are temporarily stored, and (25
) is an I10 port through which input data and output data are exchanged with external devices.

(27) is a PC link module, (2g) is a serial input/output control device, and (29) is an interface.

The serial input/output control device (28) is connected to the interface (29
) to send and receive data serially to other PCs,
Data is exchanged in parallel with this scale PC (11). (12) is the large-scale PC link area shown in FIG. In addition, this large-scale PC link area (
12) is actually often provided as a part of the I10 table (20), but for convenience of explanation, it will be described here as having a different configuration.

In addition, small-scale PCs (13), (15), (17),
The hardware configuration of (19) is the same as the second one, except that the capacity is smaller and the configuration of the PC link module is slightly different.
It is basically the same as shown in the figure.

FIG. 3 shows the hardware configuration of a small-scale PC link module (27A). A switch (80) is connected to the interface (29), and a block code for identifying the PC itself is set by this switch (30). (14) is the small-scale PC link area shown in FIG. Other small PC
The hardware configurations of the PC link modules (15) and (17) are also the same as the configuration shown in FIG.

In the PC network configured as above,
The operation when transmitting data from the small-scale PC (13) to the large-scale PC (11) will be explained with reference to the flowchart shown in FIG.

Small-scale PC (IA) is a PC link module (2
7A) switch (30) open/close signal
The block code is read through the block code (29) and its own block code is specified. Here, let the block code be A (S
l). Next, the other party code set on the switch or RAM is read (S2). Next, the block code and the code of the other station are transmitted (S3, S4).

On the other hand, when the large-scale PC (11) receives the block code, it checks whether the code is within the PC link area (12) (323) and then checks the code sent as the code of the other station. It is checked whether the code matches the code of the own station (S24).

If they match, a confirmation signal is sent to the small-scale PC that is the transmitting station.
(13) (S25).

When the small-scale PC (13) receives the confirmation signal, (
S5), and transmits the address and data of the control area (13a) (S6). This control area (1
Address 3a) is assigned block code A. The large-scale PC (11) stores the transmitted data in the control area (13a) of block A of the PC link area (12).

When the reception of the data is completed, a confirmation signal is sent again to the small-scale PC (13), which is the transmitting station (S27). When the small-scale PC (13) receives the confirmation signal, it ends the transmission operation (S7).

Incidentally, if the confirmation signal is not received in the small-scale PC (13) (S5, S7), it is either retransmitted, or the process proceeds to the abnormality processing routine (S8).

Note that although the above embodiment is an example in which data is transmitted from a small-scale PC to a large-scale PC, the same operation is performed when data is transmitted in the opposite direction. However, since the large-scale PC at that time does not have a block code set, the block code is lent from the data address and the block code is transmitted. Furthermore, the small-scale PC deletes the block code from the received control area address and stores the data in the PC link area.

(Effect of the invention) As described above, according to this invention, large-scale PC and small-scale PC
When exchanging data with C, the PC of a large-scale PC
The link area is divided according to the size of the PC link area of the small PC, and each divided area and each small PC are
Since the PC link area of the PC and the PC link area of the PC are matched and signals are exchanged between the two, it is possible to effectively utilize the PC link area of the large-scale PC.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a PC network according to an embodiment of the present invention, FIG. 2 is a block diagram showing the hardware configuration of a large-scale PC, and FIG. 3 is a block diagram of a PC link module of a small-scale PC. FIG. 4 is a flowchart showing the data transmission/reception operation of the apparatus shown in FIG. FIG. 5 is an explanatory diagram showing a conventional PC network. In the figure, (12) is a large-scale PC link area, (
14), (1B), (1g), and (20) are small-scale PC link areas. Agent Patent Attorney Sou Sasaki Illustration 4

Claims (1)

[Claims] Among programmable controllers (hereinafter referred to as PCs) that can mutually send and receive data, large-scale PCs
The PC link area of the small PC is divided according to the size of the PC link area of the small PC, each of the divided areas is associated with the PC link area of the small PC, and data is exchanged between the two. Features a programmable controller transmission and reception method.