JP2830707B2 - Electronic unit with internal setting switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic unit for a control system and the like, and more particularly to improvement of usability and maintenance of an internal setting switch.

[0002]

2. Description of the Related Art An electronic unit used for industrial control equipment is provided with an internal setting switch on the side as disclosed in Japanese Utility Model Publication No. 61-20794. Such an electronic unit is disclosed in, for example, Japanese Utility Model Laid-Open No. 64-3.
As disclosed in Japanese Patent Application Laid-Open No. 0892, a structure in which a plurality of sets are attached to a housing called a nest is provided.

The function of the internal setting switch is, for example, address setting. Generally, in a process control device, a control unit, a monitoring unit, an operation unit, and the like are connected by a communication bus, and control is performed while exchanging data via the communication bus. For this data exchange, it is necessary for each unit to set a unique address.

[0004]

However, the location of the internal setting switch in each unit is located at a position where the internal setting switch is connected to the housing or on the front panel surface. In this case, if there is an internal setting switch at the back position, it is necessary to pull out each unit from the housing and perform setting work, and part of the control function will be stopped during maintenance work, so-called online maintenance There was a problem that work was not possible. Also, if there is an internal setting switch on the front panel surface, the internal setting switch can be operated even when the power is on, so online maintenance work is also possible, but if the switch is exposed on the surface, accidental self-setting There has been a problem that a change in the setting of the switch may cause an unintended accident to occur on the process side. An object of the present invention is to provide an electronic unit having an internal setting switch that can easily perform a setting operation, can perform an online maintenance operation, and does not have a possibility that a setting content is disturbed by an external influence. I do.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a printed circuit board (10) having means for electrically connecting to a housing, a method of fixing the printed circuit board to an end face of the printed circuit board, and An electronic unit having a front panel (20) attached to the opening of the housing and an internal setting switch (30) mounted on the printed circuit board has the following configuration.

That is, a switch opening (21) slightly larger than an operation surface of the internal setting switch provided on the front panel surface, and setting contents of the internal setting switch displayed near the switch opening. And a transparent cover (23) which is detachably attached so as to cover the switch opening, and that the operation surface of the internal setting switch is slightly away from the switch opening. The internal setting switch is mounted at a position of the printed circuit board in a recessed state.

[0007]

When the internal setting switch is operated, the transparent cover is removed to perform the setting operation. Since the printed circuit board may be in an energized state, an on-line maintenance operation can be performed, and the chance of erroneous setting is reduced by referring to the setting guide. In the normal operation state, the setting contents of the internal setting switch can be visually recognized with the transparent cover attached,
By referring to the setting guide section, the correct setting contents can be quickly grasped. In addition, since it is protected by the transparent cover, the setting contents of the internal setting switches are less likely to be out of order.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG.
FIG. 1 is a perspective view of a main part of an assembled state showing an embodiment of the present invention. In the figure, a printed circuit board 10 is provided with electronic components required for the function of the electronic unit, and an internal setting switch 30 is provided near an end face on the front panel 20 side.
Are mounted, and a mounting hole 11 is formed in a corner. Also, as shown in FIG.
A connector 12 is mounted on the end face at the back of 0, and engages with a connector on the housing case (not shown) to perform electrical connection. Note that a so-called card edge may be used instead of the connector 12.

The front panel 20 is attached to an opening of a housing (not shown), and the knob 24 allows the entire unit to be removed from the housing. The switch opening 21 is an opening formed on the surface of the front panel 20 and is formed at a position facing the internal setting switch 30, and has a size slightly larger than the operation surface of the internal setting switch 30. . The setting guide section 22 displays the setting contents of the internal setting switch 30 in the vicinity of the switch opening section 21. For example, in the case of setting an address with an 8-bit switch, discrimination between "0" and "1" of each bit is made. , LSB and MSB are displayed. Transparent cover 2
Reference numeral 3 denotes a switch facing portion 23a which is attached to the switch opening 21 and covers the operation surface of the internal setting switch 30.
And a locking claw 23b elastically engaged with the end of the switch opening 21. The switch facing portion 23a is transparent so that the setting state of the internal setting switch 30 can be visually recognized from the outside. The locking claws 23b are provided at both ends of the switch facing portion 23a in a C shape. The knob 24 is attached to the upper and lower sides of the front panel 20 and has a card removal mechanism (not shown).
The card holding plate 25 has screws to be screwed into the mounting holes 11 and is used to integrate the printed circuit board 10 and the front panel 20.

FIG. 2 is an explanatory diagram of the internal setting switch 30.
(A) is a sectional view of a main part showing a positional relationship with the front panel 20, and (B) is a plan view of an operation surface. The distance d between the front panel 20 and the internal setting switch 30 is equal to the transparent cover 2
3, the setting operation of the internal setting switch 30 can be easily performed from the switch opening 21 and the transparent cover 2 can be set.
3 is set to a value at which the setting contents can be visually recognized in a state where the device is mounted, for example, several mm. The internal setting switch 30 uses a general-purpose component, and uses an 8-bit on / off switch.

FIG. 3 is a structural perspective view of the entire electronic unit. A switch opening 21 is provided below the front panel 20, and the printed circuit board 10 is located on the back of the front panel 20, and is mounted on a housing (not shown).

FIG. 4 is an enlarged view of a main part of the front panel 20. Here, setting guides 22a and 22b are provided corresponding to the switch openings 22a and 22b, and a setting guide 22c is provided for common display. Setting guide section 22
In a, a parity bit, a domain number bit, and “0” are displayed for unused bits. The setting guide section 22b displays a parity bit and a bit for an address number. By displaying the LSB and the MSB, the weighting of each bit can be easily visually recognized. The setting guide section 22c displays the entire setting contents, and in this case, displays that it is the station address of the unit on a bus called a V net.

[0013]

As described above, according to the present invention, the internal setting switch 30 is provided at a position near the surface of the front panel 20 so that the setting contents can be easily understood by the setting display section 22 and the removable transparent cover 23 can be used. Since the cover is covered, online maintenance is possible even in the setting operation, and the setting contents of the internal setting switch 30 are easy to understand even in a normal operation state, and the setting is not feared because the cover is covered with the transparent cover 23. is there.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an assembled state showing one embodiment of the present invention.

2A and 2B are explanatory diagrams of an internal setting switch 30; FIG. 2A is a cross-sectional view of a main part showing a positional relationship with a front panel 20;
(B) is a plan view of the operation surface.

FIG. 3 is a configuration perspective view of the entire electronic unit.

FIG. 4 is an enlarged view of a main part of the front panel 20.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Printed circuit board 20 Front panel 21 Switch opening 22 Setting guide part 23 Transparent cover 30 Internal setting switch

Claims (1)

(57) [Claims] 1. A printed circuit board having means electrically connected to a housing, and a front panel fixed to an end surface of the printed circuit board and attached to an opening of the housing. And an electronic unit having an internal setting switch (30) mounted on the printed circuit board, wherein a switch opening (2) slightly larger than an operation surface of the internal setting switch provided on the front panel surface is provided.
1) and a setting guide section (2) for displaying the setting contents of the internal setting switch displayed near the switch opening.
2) and a transparent cover (23) which is detachably attached so as to cover the switch opening, and wherein the operation surface of the internal setting switch is slightly depressed from the switch opening. The internal setting switch is mounted at the position of the printed circuit board.When operating the internal setting switch, the transparent cover is removed, and the setting content of the internal setting switch is set in a normal operation state with the transparent cover attached. An electronic unit having an internal setting switch, wherein the electronic setting unit can visually recognize the user.