JPH077287B2 - Programmable sequence controller - Google Patents

Description

The present invention relates to a programmable sequence controller (hereinafter simply referred to as PCS, which is a programmable sequence controller) used for controlling a large number of devices according to predetermined conditions. (Abbreviation of controller system), and more particularly to a PCS having a plurality of indicator lights for displaying signal states of a plurality of input / output terminals.

[Conventional technology]

The conventional PCS generally has a display function of an input / output signal in order to help the correction of the user program and the investigation of the cause of the malfunction of the control system.

And in this case, in many PCS, as shown in FIG. 5, this indicator lamp has a signal input terminal and an output terminal,
In a so-called I / O module case, it is common to arrange these I / O terminals side by side. In FIG. 5, 51 is an input / output module, 53 is a terminal cover,
Further, 45 represents an indicator light.

Separately from this, as shown in FIG. 6, there has been proposed one in which the indicator lamp 45 is arranged above the terminal cover 53 of the input / output module 51. In addition, such PCS
For example, see JP-A-58-78207 and JP-A-5-78207.
It is disclosed in Japanese Patent Laid-Open No. 8-94011 and Japanese Patent Laid-Open No. 58-132809.

[Problems to be solved by the invention]

By the way, in many cases, this indicator lamp is generally provided in the same number as the number of input / output signals. Therefore, the number is usually considerable, and many of them are provided on the surface panel of the input / output module. It occupies a portion, which is a big obstacle to downsizing of the entire PCS device.

In other words, in the above-mentioned conventional technology, no consideration is given to the fact that the front panel area of the PCS is increased due to the mounting area of the operation indicator light, and there is a problem that it is difficult to downsize the PCS. It was

It is an object of the present invention to provide a PCS that addresses the above-mentioned problems of the prior art and is sufficiently miniaturized.

[Means for solving problems]

According to the present invention, the above object is to attach an indicator lamp to a cover of a terminal block of an input / output module, and to connect the terminal block and the cover with a detachable electric coupling means, whereby the terminal block is connected. This is achieved by arranging the indicator lamp and the indicator lamp so as to overlap each other in the depth direction of the module.

[Work]

A cover is provided on the surface of the terminal block of the input / output module of the PCS for the purpose of safety maintenance such as electric shock prevention.

Therefore, if an indicator lamp is arranged on this cover and the signal status of the input / output terminals is transmitted to each indicator lamp through a detachable connecting means such as a connector, the operation indicator is displayed on the cover on the surface of the terminal block. Therefore, according to the present invention, the area due to the indicator lamp that occupies a part of the front panel of the input / output module in the conventional example becomes unnecessary and the size can be reduced.

〔Example〕

Hereinafter, the PCS according to the present invention will be described in detail with reference to the illustrated embodiments.

First, the internal structure of the embodiment of the present invention will be described with reference to FIG.

In FIG. 4, the arithmetic unit 1 is connected to the input module 2 and the output module 3 via the parallel I / O bus 6, while the blocks 4 and 5 to which the indicator lights 28 and 38 are attached are: It is adapted to be connected to the input module 2 and the output module 3 via the connectors 27 and 38. Here, these blocks 4 and 5 are attached to the terminal covers provided to the external input terminals 29 and the external output terminals 39 provided in the modules 2 and 3, respectively, which will be described later.

The signal input from the external input terminal 29 is
After the voltage level and current are adjusted at 24, they are transmitted to the buffer 22 via the insulating portion 23. The signal input, which is the output of the buffer 22, is supplied by the calculating means 11 when the calculating means 11 makes a request by the gate 21 which controls conduction and non-conduction of the signal at the timing required by the calculating means 11. Read.

In parallel with this, the output of the buffer 22 is transmitted to the driver 25 that drives the operation indicator light 28, and its output is the connector.
It is supplied to the indicator light 28 via 27 and makes it blink. Therefore, this causes the status of the signal input to be displayed.

On the other hand, the calculation means 11 performs the signal input calculation based on the user program stored in the user program storage means 12 under the jurisdiction of the system program stored in the system program storage means 13, and outputs the result as The latch 32 is written via the parallel I / O bus 6 and the gate 31.

Then, the calculation result written in the latch 32 passes through the output buffer 33 and the insulating section 34 as a signal output, and is adjusted by the voltage conversion section 39 to a desired voltage and current as an external signal, and then externally. Output to the output terminal 39.

In parallel with this, the output of the latch 32 is transmitted to the driver 36 that drives the operation indicator lamp 38, the output of the driver 36 is given to the indicator lamp 38 via the connector 37, and blinks the signal to output the signal. Display the status.

Next, one embodiment of the input module 2 and the output module 3 in the present invention will be described with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, 41 is an input / output module, which is a common representation of each of the input module 2 and the output module 3 in FIG. 4, and 42 is a terminal block,
42a is an insulating wall on the side of the terminal block 42, 43 is a terminal cover, 44 is an input / output terminal corresponding to the external input terminal 29 or the external output terminal 39 in FIG. 4, and 45 is an indicator light composed of a light emitting diode. Corresponds to the indicator light 28 or 29 in FIG.

The terminal block 42 is attached to the front of the input / output module 41, and the insulating wall 42a of the terminal block 42 is formed thick, and a plurality of female connectors 47 are provided in this portion.

On the other hand, corresponding to this, a plurality of male connectors 46 are also provided on the back surface of the terminal cover 43.
The terminal block 42 and the terminal cover 43 are detachably configured by fitting and detaching the 46 and the female connector 47 of the terminal block 42, and electrical connection between them can be obtained. ing. Therefore, the combination of these male connector 46 and female connector 47 is the connector 2 in FIG.
It supports 7, 37.

FIG. 2 is a cross-sectional view of the input / output module 41 and the terminal cover 43 taken along a horizontal plane. In this figure, a printed wiring board 48 is provided inside the terminal cover 43, and signals from the male connector 46 are received. It has a structure for transmitting to the indicator light 455. Also, the female connector 47 has its leads extended,
The input / output module 41 is soldered to a printed wiring board 49, and the lead of the terminal 44 is also connected to the printed wiring board 49 by soldering.

As described above, the terminal cover 43 has its male connector 46
Is a female connector 47 provided on the insulating wall 42a of the terminal block 42.
When it is inserted into the terminal block 42, the terminal block 42 is detachably held. Then, when connecting or disconnecting the external signal line to or from each terminal 44, remove the cover 43 from the terminal block 42, and otherwise mount it on the terminal block 42 with the male connector 46 and the female connector 47. if,
The cover 43 sufficiently independently functions as both a function as a cover for ensuring safety and a function as a block for holding the indicator lamp.

Therefore, according to this embodiment, despite having a large number of indicator lamps 45 to provide a sufficient operation display function,
The space required for the front panel of the I / O module 41 is
Only the terminal block 43 is required for installation, and as shown in FIG. 3, the front panel area of the entire PCS can be reduced and the size can be sufficiently reduced.

That is, according to this embodiment, as shown in FIG.
Since the operation display of the input / output module 41 is provided by the indicator lamp 45 provided on the surface of the terminal cover 43, it is necessary to leave a space for providing the indicator lamp 45 on the front panel of the input / output module 41. The width W of the entire PCS can be greatly reduced as compared with the case of the conventional example shown in FIG. 5, and sufficient miniaturization can be obtained.

Further, according to this embodiment, the height h of the entire PCS is greatly reduced as compared with the case of the conventional example shown in FIG. 6, and miniaturization can be sufficiently achieved, and the position of each indicator light and each terminal are Since the positions substantially correspond to each other, it is possible to maintain a sufficient display function without causing a fear that the correspondence between the indicator lamp and the terminal becomes difficult to understand as in the conventional example of FIG. .

Further, according to this embodiment, the female connector 47 is connected to the terminal block.
It is provided on the insulating wall 42a on the side of 42, and as a result, the number of connecting circuits of this female connector 47 can be considerably increased.

Therefore, according to this embodiment, so-called parallel connection is possible, in which a plurality of indicator lights are connected independently of each other, so that serial transmission means and the like are not required and the configuration can be simplified.

It is also possible to attach a simulated signal input device as shown in Japanese Utility Model Laid-Open No. 55-22904 to the terminal cover.

〔The invention's effect〕

As described above, according to the present invention, it is not necessary to provide an independent space for installing an indicator light on the front panel of the input / output module, and therefore, the problems of the conventional technology can be sufficiently dealt with, and the size can be significantly reduced. It is possible to easily provide a personalized PCS.

[Brief description of drawings]

1 is a perspective view of an input / output module according to an embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a front view showing an embodiment of a programmable sequence controller according to the present invention. FIG. 5 is a block diagram showing the internal structure of an embodiment of the present invention, and FIGS. 5 and 6 are front views of a conventional example. 41 …… Input / output module, 42 …… Terminal block, 42a …… Insulating wall, 43 …… Terminal cover, 44 …… Terminal, 45 …… Indicator, 46
…… Male connector, 47 …… Female connector, 48,49 …… Printed wiring board.

Claims (4)

[Claims] 1. A signal input state to a plurality of input terminals is used as a variable, a calculation is performed in accordance with a preset predetermined procedure, and a signal according to the calculation result is output to a plurality of output terminals to control an external device. In a programmable sequence controller equipped with a plurality of indicators for displaying the signal states of at least a part of these plurality of input terminals and output terminals, a terminal block attached to the front of the case of the input / output module, and A cover of the terminal block to which an indicator light is attached and a detachable coupling means for coupling the cover and the terminal block are provided, and the indicator means allows the indicator lamp to move in the depth direction of the input / output module. The cover is attached to the terminal block in a state of being stacked on the Programmable, characterized in that electrical connection that is configured to be supplied
Sequence controller. 2. The connection member according to claim 1, wherein one of the connecting members of the connecting means is provided on an insulating wall formed on one side of the terminal accommodating portion of the terminal block. Features programmable sequence controller. 3. The display device according to claim 1, wherein each of the plurality of indicator lights is arranged on the display of the cover while maintaining a positional relationship corresponding to each of the terminals accommodated in the terminal block. Programmable sequence controller. 4. The display lamp according to claim 1, wherein the plurality of indicator lights are connected to the plurality of input terminals and the output terminals respectively through independent connection paths and buffer circuits. A programmable sequence controller characterized in that