JPH0631521Y2 - Data link device for programmable controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a programmable controller data link device for allocating input / output points to a master station and a slave station in order to perform a data link.

[Prior Art] Programmable controllers that can easily change the sequence control program in order to accurately control or monitor the production equipment in which various automatic processing lines, parts assembly lines, and many other machines are combined are used in a wide range of industries. It is used in the field, and the relay sequence circuit is made non-contact to efficiently perform complicated and sophisticated sequence control.

In the programmable controller, a data link device that transmits / receives data for sequence control between a master station (master station) and a slave station (remote station) is used, which allows centralized control of various devices and control targets. Remote control is being performed.

In such a data link device, input / output points are allocated between a master station and a slave station for transmitting / receiving data for control, which is as shown in FIG. 5, for example.

FIG. 5 shows allocation of input / output numbers of input / output points in the conventional data link device, and shows an example in which 64-point input / output cards are attached to four slave stations. 64
A point input / output card is a unit that is installed in a slave station and is used to perform input / output. 0 to 31 points are input points (X), 32 to 63 points are output points (Y), and total. It is composed of 64 input / output points.

As described above, the input / output number means a number assigned to each input / output point, that is, an address at which input / output data is transmitted / received. Then, the actual input / output numbers (actual I / O numbers) of the slave stations are allocated in correspondence with the four 64-point input / output cards actually mounted. That is, the input / output number of 0 to 1F hex (hexadecimal number) is input to 32 input points and the input of 20 to 3F hex is input to 32 output points on the 1st 64-point input / output card. Output numbers are assigned, and a total of 64 input / output numbers are assigned. Similarly, for the 2nd 64 point I / O card, 4
I / O number for 0-5F hex, I / O number for 60-7F hex, 80-9F for 64 point I / O card "3"
Hexa I / O number, A0-BF Hexa I / O number,
And the 64-point input / output card "4" is C0-DF
Hexa I / O number, E0-FF Hexa I / O number,
Therefore, a total of 256 actual input / output numbers are allocated to the slave stations. Here, the actual input / output number is the input / output number assigned to the input / output point at which the input / output data calculated by the slave station is transmitted / received via the actually installed input / output card. It refers to the output number.

By assigning in this way, the input / output number of the master station and the actual input / output number of the slave station are overlapped with the input / output number of the input (X) and the output (Y) via the 64-point input / output card. Therefore, the master station and the slave stations are associated with each other with the same input / output number on a one-to-one basis, and data is transmitted and received between the master station and the slave stations.

[Problems to be Solved by the Invention] However, since the input / output number of the input (X) and the input / output number of the output (Y) are conventionally assigned so as not to overlap, according to the example of FIG. Although each of the input points and the output points has only 128 control targets, 256 input / output numbers are required for each. In particular, when a large number of slave stations are provided to enhance the control function, there is a problem that the number of allocation points of the master station becomes enormous.

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a data link device for a programmable controller capable of efficiently allocating input / output numbers and increasing the number of control points. It is in.

[Means for Solving Problems] In order to achieve the above object, the programmable controller data link device according to the present invention is set so that the input point and the output point in the master station are assigned to the same input / output number. At the same time, the slave station is provided with a sorting means.

This distribution means distributes the input / output number of the master station to the actual input / output point allocation number of the slave station corresponding to the input / output point.

[Operation] According to the above configuration, when data is input / output between the slave station and the master station, the distribution means of the slave station causes the actual input / output number of the slave station to correspond to the input / output number of the master station. It is distributed. Therefore, even if the input point and output point at the master station are assigned to the same number, when performing data link with the slave station, the input point and output point set at the slave station will have different numbers. It will be distributed.

Thereby, when transmitting / receiving data between the master station and the slave station, the correspondence relationship between the input / output points of both stations can be established.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a simple configuration of a data link device for a programmable controller. (1) is a master station (master station) installed in the programmable controller main body, (2) is various devices or is remotely operated. The slave station (remote station) installed in the vicinity of the controlled object (3) is a distribution means which is a characteristic constituent feature of the present invention.

The characteristic feature of the present invention is that the input point and the output point in the master station are assigned the same number, and when the data is transmitted and received from the master station to the slave station or from the slave station to the master station, the distribution means is used. The correspondence between the input and output points of both stations is taken, and FIG. 2 shows the numbering of the input and output points in the present invention.

As shown in Fig. 4, when four 64-point I / O cards are installed in the slave station, the actual I / O number is 0 for 256 points, as in the past.
Although it is a FF hex, the input / output number for the input (X) and the input / output number for the output (Y) in the master station can use the overlapping numbers.
The input / output numbers for 8 points may be assigned to the same number. As a result, 128 points of input / output numbers are reduced in the master station as compared with the conventional one.

Then, the input / output number of the master station and the actual input / output number of the slave station are associated with each other by the allocating means, and the allocating means is composed of a microcomputer or the like. The operation of this distribution means is shown in FIG. 4, which will be described in comparison with the conventional input / output operation of FIG.

First, in FIG. 3, the output data shown in FIG. 3A is transmitted from the master station to the slave station by the input / output number of the allocated output (Y), and the input / output number is directly output to the slave station (Y ) Is the actual input / output number. Also for the input shown in FIG. 6B, the actual input / output number of the input (X) of the slave station is transmitted as it is as the input / output number of the input (X) of the master station.

In contrast to such conventional transmission / reception, in the distribution means of the present invention shown in FIG. 4, first, the input / output number of the output (Y) assigned to the master station shown in FIG. Then, the output of the slave station corresponding to the input / output number of the master station (Y)
Assigned to the actual input / output numbers. Also, regarding the input / output numbers shown in FIG. 6B, the actual input / output number of the input (X) distributed in the slave station is converted into the corresponding input / output number of the input (X) of the master station. It will be transmitted to the master station.

In this way, the data link between the master station and the slave station is performed, and thus it becomes possible to control input / output of a large amount of data.

[Effects of the Invention] As described above, according to the present invention, the input point and the output point in the master station are assigned to the same input / output number and set, and the slave station is provided with the distribution means. It is possible to significantly reduce the I / O number at the station, which makes it possible to greatly increase the number of slave stations connected to the master station, and also to greatly increase the number of I / O points of the master station itself. Will also be possible.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the structure of a data link device for a programmable controller according to the present invention, and FIG. 2 is an explanatory view showing the allocation of the master station input / output numbers and the slave station actual input / output numbers of the present invention. FIG. 3 is an explanatory diagram showing a transmission / reception state of input / output data in the conventional data link device, FIG. 4 is an explanatory diagram showing the operation of the distributing means of the present invention, and FIG. 5 is a master station input in the conventional data link device. It is explanatory drawing which shows the allocation of the output number and the actual input / output number of a slave station. In the figure, (1) is a master station, (2) is a remote station, and (3) is a distribution means.

Claims (1)

[Scope of utility model registration request] 1. A programmable controller data link device for performing data link between a master station and a slave station according to an input / output number to which a predetermined number of input / output points are assigned by an input / output card. To the same input / output number, and the slave station is provided with means for allocating the input / output number of the master station to the actual input / output number of the slave station corresponding to the input / output point of the master station. Data link device.