JPH03225544A - Switching device - Google Patents

Abstract

PURPOSE:To obtain the switching device capable of altering and extending a system by enabling the switching device to discriminate which connection plug an input/output device to be connected is connected to and connect a controller to the corresponding input/output device. CONSTITUTION:The controller 21 varies the INIT signal of a switching control signal 25a to L, H, and L in order. The complement of 15 corresponding to the kinds of I/O devices set in counter circuits 33a - 33d are loaded. Then the controller 21 varies the SLCT signal of the signal 25a to L, H, L, H, L, H, and L in order to generate counting signals as many as the kinds of the I/O devices which are selected. Consequently, the circuits 33a - 33d count up by the input count signals and the output of the circuit 33a in a low-order side switching device 22b which reaches 15 becomes L. The outputs of the circuits 33a - 33d and the NEXT signal of the switching control signal 29b are inputted to an encoder circuit 34, so that a port address 3 and a switching permitting signal are sent to a switching circuit 26a in a host switching device 22a.

Description

[Detailed Description of the Invention] "Summary" This invention relates to a switching device that selects one of a plurality of input/output devices and connects it to the control device according to instructions from the control device, and allows input/output devices to be connected to the control device without changing the control program of the control device. The purpose is to easily change the output device type to a different type or change the connection order, and there are multiple connection plugs for connecting the human output mW or input/output device and the subsequent switching device. Type of input/output device connected to each connection valve j = On the means for setting such information, the switching control signal given in series from the control device and the type of input/output device set by the above means. Based on such information, a means for connecting the control device and the corresponding input/output device or subsequent switching device is provided.

[Field of Industrial Application] The present invention relates to a switching device that is located between a control device and a plurality of input/output devices (hereinafter also referred to as I10 device) and controls the connection between the control device and the input/output devices, and particularly relates to , relates to a switching device that can arbitrarily connect input/output devices of different types to a connection plug (hereinafter also referred to as a connection port).

[Prior art] Figure 8 shows a conventional switching device, control device, and ■/'0
It is a diagram showing the relationship between devices, and shows a configuration in which four 110 devices are switched and connected to a control device.

In the figure, 51 is a control device that controls the switching device and the I10 device, 52 is a switching device that switches the connection of the I10 device under control from the control device 51, and 53
-1 to 53-4 are each system? 110 device controlled by B device 5; 54 is I10 device 53 controlled by control device 51;
55 is a switching control signal for controlling switching of the switching device 52 from the control device 51; 56 is a control signal for controlling the switching device 52 from the control device 51 to I10;
A switching circuit for switching control signals 54 between devices 53-1 to 53-4 is shown.

When selecting one of the I10 devices 53-1 to 53-4, the control device 51 inputs the connection port address (letter A, in the figure) of the switching device 52 to which the selected I10 device is connected. B.

(shown as C, D) are instructed by the switching control signal 55.

[Problems to be Solved by the Invention] In the conventional switching device as described above, there were problems as described below.

■ 'tr'i? With the increase in the number of I10 devices,! If you don't increase the number of ports to connect 1000 units, it will be 12:0). For this reason, if the same type of switching device is used in systems with different numbers of ■/○ devices, I 1
012 systems), the connection ports are not stationed.On the other hand, if each system had an optimal number of connection ports, the number of types of switching devices would increase.

- If the number of I10 devices to be controlled increases, the number of switching control signals must also increase. This change has a large influence on the control device, and the number of I10 devices that can be connected is also limited due to the limit on the number of switching control signals on the control device.

(2) The control device needs to be aware of which port of the switching device the I10 device to be controlled is connected to. Therefore, when the connection order of the I10 devices is changed or when different I10 devices are connected, the control program of the control device must also be changed. Furthermore, if the control program of the control device is not changed, the position of the port of the I10 device to be connected and the type of I10 device to be connected will be limited.

In order to solve the above-mentioned problems, the present invention makes it possible to increase the number of I10 devices to be controlled without increasing the number of switching control signals, and allows the control device or control program to control the switching device of the I10 devices. It is an object of the present invention to provide a switching device that can perform switching control without being aware of the connection state of the terminals.

[Means for Solving the Problems] According to the present invention, the above objects are achieved by the means described in the claims.

That is, the invention of claim 1 is a device located between one control device and a plurality of input/output devices to control the connection between the control device and the input/output devices, and which connects the input/output devices. means for setting information regarding the type of input/output device connected to each connection valve, a switching control signal given in series from a control device, and input/output set by the above means. A switching device is provided with means for connecting a control device and a corresponding input/output device based on information regarding the type of the device, and the invention of claim 2 also provides:
A device that is located between a control device and a plurality of input/output devices, and controls connections between the control device and the input/output devices, and includes a plurality of connection plugs for connecting the input/output devices, and a plurality of connection plugs for connecting the input/output devices, and at least one connection plug for connecting a rear switching device; means for setting information related to the type of input/output device connected to each connection plug or the rear switching device;
means for transferring a switching control signal given serially from the control device to a subsequent switching device; a switching control signal given serially from the control device directly or via a higher-order switching device; and setting by the means. This switching device is provided with a means for connecting a control device and a corresponding input/output device based on the type of the input/output device or information regarding a subsequent switching device.

[Function] In the switching device of the present invention, each of the plurality of connection plugs to which the input/output device is connected may be of any type (for example, if the input/output device is an image league, A4.
You may also connect other input/output devices (for example, 3).

The type of input/output device to be connected to which connection plug is set by the means 2 for setting 1-information related to the type of input/output device corresponding to those connection plugs.

This can be set using, for example, a "toggle switch", a 60-tall switch, a U-link, or the like.

On the other hand, the control device does not need to be aware of what type of input/output device is connected to which connection plug.

Then, information regarding the type of input/output device to be accessed is provided to the switching device as serial data.

When the switching device receives this information, it identifies which connection plug the input/output device to be connected is connected to from this information and the information set for each connection plug, and controls it.
In the invention of claim 2, characterized in that a device and a corresponding input/output device are provided, at least one of the connection valves is provided with another switching device f! In addition to making the (lower-level switching device) connectable, we also provide a means to transfer the switching control signal from the control device to the lower-level switching device, which allows multiple switching devices to be connected in cascade. It becomes possible to connect more types of different input/output devices.

Hereinafter, the present invention will be explained in more detail based on Examples.

[Embodiment] FIG. 1 is a diagram showing a first embodiment of the present invention, and is a diagram showing a system configuration when the switching device of the invention according to claim 1 is used.

In the figure, 1 is a control device, 2 is a switching device, and 3-
1 to 3-n are I/○ devices, 4 is a control signal for the control device to control the I10 device, 5 is a switching control signal for the control all device 1 to control the switching operation of the switching device 2, and 6 is a control signal for controlling the switching operation of the switching device 2. A switching circuit for switching the control signal 4 between the control device 1 and the I10 device; 7 a setting switch for setting the type of I10 device connected to each port of the switching device 2; 8 a switching circuit from the control device 1; A selection circuit for generating a switching signal for the switching circuit 6 from the control signal 5 and the setting switch 7 is shown.

FIG. 2 shows an example of the setting switch 7 and selection circuit 8 when switching between four I10 devices in the above embodiment. In the figure, 9a to 9d are switches, and 10a to 10c are NOT circuits (for example, 7414 type N
OT port), lla to lid are counter circuits (e.g. 7
4193 type counter circuit), 12 is an encoder circuit (
For example, a 74148 type encoder circuit) is shown.

The switches 9a to 9d correspond to each port of the switching device, and a value corresponding to the type of the machine/○ device connected to each port is set. For example, if the type of I10 device is "2J", the contact at position 21 is closed and the contacts at position 23, 22, and 2° are opened.At this time, the output value of setting switch 7 is "2".
The complement number "13" of "15" is transmitted to the selection circuit 8.

NOT circuits 10a to IOC transmit the I N IT signal and 5LCT signal, which are switching control signals 5, to counter circuits 11a to lid, respectively.

The counter circuits 11a to 11d are loaded with the output value of the setting switch 7 when the output of the NOT circuit 10a is "L",
When the output of the NOT circuit 10c changes from "L" to "H", the count value is incremented by "+1". Further, each output is transmitted to the encoder circuit 12, and the count value is the maximum value "15" and the output of the NOT circuit IQc is "L".
It becomes "L" at the time of .

The encoder circuit 12 generates switching signals to the switching circuit 6 as shown in Table 1 in accordance with the outputs of the counter circuits 11a to 11d. Here, A.D.
The R1 signal and the ADRO signal specify the connection port address of the selected ■/○ device, and the ENBL signal specifies switching permission. Note that "X" in Table 1 indicates don't care.

Next, the detailed operation of the selection circuit 8 will be explained using FIG. For convenience of explanation, the port address of the switching device is "0".
type “3” for port address “1” and type “2” for port address “1”
10 devices are connected and the I10 device of type V3 is selected. The type of I/O device connected to the other port addresses is arbitrary, but its operation is the same as described below.

First, the control device 1 changes the INIT signal of the switching control signal 5 from L"-"H" to "L" (■ in the figure)
. At this time, each of the counter circuits 11a-lid is loaded with a complement value of "15" corresponding to the type of I10 device set in the switches 98-9d.

Next, the control device 1 outputs the 5LCT signal of the switching control signal 5 from “L” → “H” → “L” → “H” → “L” → “H”.
- "L" and generate a number of counting signals corresponding to the type of T10 device to be selected (■ in the figure). As a result, each of the counter circuits 11a to 11d counts up by the input count signal, and the output of the counter circuit 11a whose count value is "15" goes "L".
becomes. At this time, each counter circuit 10a to li
The output of d is input to the encoder circuit 12, and as a result, the port address "0" and the switching permission signal are transmitted to the switching circuit 6.

The switching operation is completed as described above, and then the control device 1 performs a control operation on the selected I10 device (■ in the figure). Furthermore, if it is desired to perform a control operation on another I/O device, the above switching operation is repeated (■ in the figure).

Incidentally, in the case of ■ in the figure, the port address "l" is selected once, but there is no problem as long as the control device 1 does not perform a control operation on the ■/○ devices.

FIG. 4 is a diagram showing a second embodiment of the present invention, and is a diagram showing a system configuration when a switching device according to the invention of claim 2 is used.

In the figure, 21 is a control device, 23-1 a to 23-
1n, 23-2a to 23-2m are I10 devices, 24a and 24b are control signals, 22a is an upper side switching device, 22b is a lower side switching device, 25a is a switching device 22a from an upper side device, Further, 25b is a switching control signal for controlling the switching of the lower switching device 22b, 29a and 29b are switching control signals for controlling switching of the switching devices 22a and 22b from the lower device, and 26a and 26b are a switching circuit for switching the control signals 24a, 24b from the upper device to the I10 device or the lower device; 27a;
27b is a setting switch for setting the type of I10 device connected to each port of the switching devices 22a and 22b, and 28a and 2gb are switching control signals 25a and 25b from the upper device and switching from the lower device. Control signals 29a, 29b and setting switch 27a
.

27b shows a selection circuit for generating switching signals for switching circuits 26a and 26b.

FIG. 5 shows an example of the setting switch 27a and selection circuit 28a when switching between four I/O devices according to the present invention. In the same figure, 31 a to 31
d is a switch, and 32a to 32e are N.

1 circuit (7414 type), 33a to 33d are counter circuits (74193 type), and 34 is an encoder circuit (74148 type).
type).

The switches 318 to 31d correspond to each port of the switching device, and set a value corresponding to the type of I10 device connected to each port. For example, if the type of the I10 device is "2", the contacts at the 21st position are closed, and the contacts at the 23rd, 22nd, and 2° positions are opened. At this time, the output value of the setting switch 27a is "
``13'', which is the complement of ``15'' of ``2'', is transmitted to the selection circuit.

The NOT circuits 32a to 32e receive an INIT signal, which is a switching control signal 25a, and a 5LCT signal from a higher-level device.
Each of the signals is transmitted to counter circuits 33a to 33d and lower-order devices.

The counter circuits 33a to 33d are loaded with the output value of the setting switch 27a when the output of the NOT circuit 32a is "L", and the count value becomes "+1" when the output of the NOT circuit 32C changes from "L" to "L". be done. Further, each output is transmitted to the encoder circuit 34, and the count value is the maximum value "15" and the output of the NOT circuit 32c is "
It becomes "L" when it is "L".

The encoder circuit 34 generates a switching signal to the switching circuit 26a as shown in Table 2 in response to the respective outputs of the counter circuits 33a to 33d and the NEXT signal which is the switching control signal 29b from the lower-order device. Accordingly, the switching circuit 26a selects the corresponding port. Here, the ADR1 and ADRO signals specify the connection port address of the selected I10 device, and the ENBL
The signal specifies switching permission. In addition, 1×” in Table 2
is Don't care.

Next, the detailed operation of the selection circuit will be explained using FIGS. 6 and 7.

Now, as shown in FIG.
2a and 22d, I10R units 23-1 to 23-7 are connected, and the type of I10 device shown in the figure is set to each port of the switching devices 22a and 22b. The process of selecting the I10 device will be explained.

Although the type of the port address "3" of the upper switching device 22a in which the switching devices are cascade-connected can be set arbitrarily, the type is set to "15" here.

First, the control device 21 inputs the switching control signal 25a.
Change the IT signal from “L” → “H” → “L” (7th
■) in the figure. At this time, each counter circuit 33a~
33d is the I/O set to switches 312 to 31d.
○The complement of "15" corresponding to the type of device is loaded.

Next, the control device 21 sends the switching control signal 25a to S.
LCT signal “L” - “H” - “L” → “H” → “L”
→ “H” → “L”, and generate a number of counting signals corresponding to the type of I10 device to be selected (■
). As a result, each of the counter circuits 33a to 33
d is the switching device 22 on the lower side that counts up by the amount of the manually input counting signal and the count value becomes "15".
The output of the counter circuit 33a in b becomes "L". The output of each of the counter circuits 33a to 33 (i and the NEXT signal of the switching control signal 29b is output from the encoder circuit 3
4, and as a result, the switching device 2 on the upper side
Port address -3 to switching circuit 26a in 2d
and a switching permission signal are transmitted, and the port address "02" and a switching permission signal are also transmitted to the switching circuit 26b in the lower switching device 22b.

The switching operation is completed by the above, and then the control device 21
Control operation is performed on the I/○ device selected by
■) in Figure 7). If the control operation is performed on another 110 device), the above switching operation is repeated (■ in FIG. 7). In addition, in the middle of selecting the I10 device of type "3", at ■ in FIG. 7, the lower switching device 2 is selected.
The port address "2" of the I10 device 2b in FIG. If not, there is no problem.

The operation of the embodiment according to the present invention has been described above, but the control device 21 and the switching device 22 in FIGS.
The connection of the switching control signal 29a between
This enables the side to determine whether the I10 device is connected directly or via the switching device 22a, and is not particularly necessary in normal operation. In addition, switching control signals 25a, 25b and 29a, 29
b does not need to be wired individually between each device, and can be wired within the same cable as the control signals 24a and 24b.

[Effects of the Invention] As described above, according to the present invention, even when the number of I10 devices to be controlled increases, there is no need to increase the number of ■/○ device connection ports of the switching device and the number of switching control signals. The switching operation procedure from 1 to 3 is not affected by the number of connection ports of the switching device and the connection state of the I10 device. Therefore, it is possible to create a small switching device that is optimized for the system, independent of the control program of the control device, and it is also possible to realize a highly flexible switching device that can accommodate system changes and expansions. It is.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, and FIG. 2 is a diagram showing a first embodiment of the present invention.
A diagram showing an example of the setting switch and selection circuit of the embodiment,
FIG. 3 is a diagram explaining the operation of the selection circuit of the first embodiment;
FIG. 4 is a diagram showing a second embodiment of the present invention, and FIG. 5 is a diagram showing a second embodiment of the present invention.
A diagram showing an example of the setting switch and selection circuit of the embodiment,
6 and 7 are diagrams explaining the operation of the selection circuit of the second embodiment, and FIG. 8 is a diagram showing the relationship between the conventional switching device and other devices. 1.21...Control device, 2.22a, 22b.
...Switching device, 3-1 to 3-n, 23-1a
~23-1 n. 23-2 a~23-2m, 23-1~23-7・
...I10 device, 4, 24 a, 24 b
...-control signal, 5.25a25b, 29a, 2
9b...Switching control signal, 626a,
26 b-==-switching circuit, 7.27a, 27b
...Setting switch, 8.28a, 28b...
...Selection circuit, 9a to 9d, 31a to 31
d...-, switch, 10a to 10c, 32a
~32e・=-NOT circuit, 11a~11cl, 33a
~33d...Counter, 12.34...
・Encoder circuit

Claims (1)

[Claims] 1. A device located between one control device and a plurality of input/output devices to control the connection between the control device and the input/output devices, the device for connecting the input/output devices. a plurality of connection valves, means for setting information regarding the type of input/output device connected to each connection valve, a switching control signal given in series from the control device, and the input/output device set by the above means. A switching device comprising means for connecting a control device and a corresponding input/output device based on information regarding the type of the switching device. 2. A device located between one control device and a plurality of input/output devices to control the connection between the control device and the input/output devices, comprising a plurality of connection plugs for connecting the input/output devices, and an input/output device. at least one connection plug for connecting an output device or a downstream switching device; means for setting information regarding the type of input/output device connected to each connection tap or the downstream switching device; means for transmitting a switching control signal given by the control device to a subsequent switching device; and a switching control signal given in series from the control device directly or via a higher-order switching device, and an input/output set by the means. A switching device comprising means for connecting a control device and a corresponding input/output device based on the type of device or information regarding a subsequent switching device.