JPH04325809A - Interface unit - Google Patents

Abstract

PURPOSE:To provide an interface unit which can be fixed easily in a board. CONSTITUTION:A case 1 for containing a circuit board mounting an interface circuit is provided. The case 1 is dimensioned so that it can be installed in a board 5. The case 1 is provided with fixing holes 3 on the both sides thereof. A pair of fixing screws 4 are inserted into the fixing holes 3 from the front of the board 5. The fixing screws 4 are driven into threaded holes made on the inside of the board 5 thus securing the case 1 to the board 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interface unit that enables data transmission with a computer outside the system in a remote monitoring and control system.

0002

2. Description of the Related Art Conventionally, a remote monitoring and control system having a configuration as shown in FIG. 6 has been provided. In this remote monitoring and control system, a monitoring terminal 32, a control terminal 33, each having address data set individually,
Various terminal devices such as a terminal device 34 for wireless relay, a terminal device 35 for external interface, and a terminal device 36 for pattern setting are connected to the main control device 31 via a transmission line Ls consisting of a pair of lines. ing. In addition, the main controller 3
Each of the terminals 32 to 36 is controlled by transmitting a transmission signal Vs in the format shown in FIG. That is, the transmission signal Vs includes a start pulse ST indicating the start of signal transmission, mode data MD indicating the mode of the signal, address data AD for calling the terminals 32 to 36, and a load L1.
~L4, checksum data CS for detecting transmission errors, and a signal return period WT for setting the return period from the terminals 32 to 36.
4V) time division multiplexed signal (see FIG. 7(b)),
Data is transmitted by pulse width modulation. Each terminal 3
2 to 36, when the address data AD of the transmission signal Vs received via the transmission line Ls matches the preset address data, the transmission signal Vs
At the same time as taking in the control data CD of the transmission signal Vs, the monitoring data signal is converted into a current mode signal (a signal sent by short-circuiting the lines of the transmission line Ls via an appropriate low impedance) in synchronization with the signal return period WT of the transmission signal Vs. send it back as

The main controller 31 is provided with dummy signal transmitting means and interrupt processing means. The dummy signal transmitting means always sends out a transmission signal Vs with the mode data MD in a dummy mode. Further, the interrupt processing means may be configured to operate on any terminal device 32, 34, except for the control terminal device 33.
35 and 36 to the interrupt signal Vi as shown in FIG. 7(c).
is returned, the terminal device 32, 34, 35, 36 that generated the interrupt signal Vi is detected, and the terminal device 32
, 34, 35, and 36 to return the monitoring data signal. For example, in the monitoring terminal device 32, when the switches S1 to S4 are operated, an interrupt signal Vi is generated. Further, in the main control device 31, based on the monitoring data signals returned from the terminal devices 32, 34, 35, and 36 as described above, the control terminal device 33 is sent to the control terminal device 33 whose correspondence is set by the address data. Connected load L
By creating control data CD for controlling L1 to L4 and time-division multiplexing transmission of a transmission signal including the created control data CD to the corresponding control terminal device 33 via the transmission line Ls, each load L1 to L4 is controlled. Control L4 individually. For example, in the monitoring terminal 32, switches S1 to S
4, the main control device 31 sends out an interrupt signal Vi, and upon receiving the interrupt signal Vi, sends out a transmission signal Vs, and receives a monitoring data signal during the signal return period. In the main control device 31, loads L1 to L to be controlled in response to monitoring data signals from the terminals 32, 34, 35, and 36
4 is set, and the loads L1 to L4 connected to the control terminal 33 are controlled according to this correspondence. Here, each of the terminal devices 32 to 36 obtains power for parts other than the load by rectifying and smoothing the transmission signal Vs that is constantly transmitted to the transmission line Ls.

[0004] A wireless receiver X is connected to the wireless relay terminal 34 via a wireless transmission line Lw. The wireless receiver The wireless relay terminal 34 transfers this data to the main control device 31.

The terminal device 35 for external interface is a terminal device for transmitting data with an external control device 37 such as a computer outside the system, and the terminal device 36 for pattern setting is a terminal device for transmitting data to and from an external control device 37 such as a computer outside the system. This is a terminal device that transfers pattern control data to the main control device 31. Here, an interface unit such as the terminal device 35 for an external interface is provided with a case shaped to be attached to a rack called a JIS rack. The monitoring terminal 32 and the control terminal 33 disposed in the distribution board 41 or the relay control panel 42 are formed to meet the agreed dimensions of the distribution board, and their control outputs A remote control relay 43 (a latching relay that can also be turned on and off using a hand switch) for controlling the load is controlled.

[0006]

[Problems to be Solved by the Invention] By the way, since the remote monitoring and control system is equipped with panels such as a distribution panel 41 and a relay control panel 42, a terminal device (interface unit) 35 for an external interface is provided. In some cases, it may be required to provide the inside of the board. However, as described above, the conventional interface unit is equipped with a case for mounting on a JIS rack, and therefore has a problem in that it is too large to be placed inside a panel.

The present invention aims to solve the above-mentioned problems and provides an interface unit that can be placed inside a panel and can be easily installed inside the panel.

[0008]

[Means for Solving the Problem] The invention according to claim 1 has a case for storing a circuit board on which an interface circuit is mounted, and the case is formed to a size that can be placed in a panel such as a distribution board. A pair of mounting holes are provided on both sides of the board, respectively, through which mounting screws that are screwed into the board are inserted from the front side of the board.

In the second aspect of the invention, a protruding piece protruding from the case is provided on the periphery of the distal end side of the mounting screw on the circuit board, and the protruding piece is a card edge connector having a plurality of conductive patterns along the protruding direction. It forms.

0010

[Operation] According to the structure of claim 1, the case is formed to a size that can be placed inside the panel, and the case has a pair of mounting holes through which the mounting screws that are screwed into the panel are inserted from the front side of the panel. Since they are installed through each side, it can be installed inside a panel such as a distribution board or relay control panel.Moreover, a pair of mounting screws can be inserted from the front side of the panel into the mounting holes of the case. By inserting it and screwing it into the board, the case can be fixed to the board, making it easier to attach the case to the board.

According to the structure of claim 2, since the card edge connector protruding from the case is formed on the circuit board, if a connector stand which is detachably connected to the card edge connector is provided in the panel, the mounting can be easily performed. Not only mechanical connection using screws but also electrical connection can be easily performed.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 3 and 4, an interface unit is formed by housing a circuit board 2 made of a printed circuit board on which an interface circuit is mounted in a case 1 formed in the shape of a rectangular parallelepiped. Case 1 is
When the width dimension is W, the depth dimension is D, and the thickness dimension is T,
It is formed into a thin box shape where W>D>T. The case 1 is formed by combining a case body 11 with an open side on one side perpendicular to the depth direction and a flat cover plate 12 that closes the opening of the case body 11. As shown in FIG. 5(c), the cover plate 12 is inserted into the cover plate 12 from the back side and is inserted into the case body 1.
It is fixed to the case body 11 by four fixing screws 13 that are screwed into a receiving tube (not shown) provided around the opening of the case body 11. Here, notch grooves 14 are formed on both end edges of the cover plate 12 that are perpendicular to the width direction of the case body 11, and the notch grooves 14 engage with a part of the protrusion 15 provided on the inner peripheral surface of the case body 11. By matching, the cover plate 12 is positioned relative to the case body 11. Each protrusion 15 is formed to run in the depth direction of the case body 11, and each protrusion 15 has a mounting hole 3 extending therethrough over its entire length. That is, case 1
A pair of attachment holes 3 penetrating along the depth direction are formed on both sides of the housing.

On the other hand, the circuit board 2 is formed in a rectangular shape with dimensions approximately equal to the width and depth dimensions of the case body 1, and a projecting piece 21 is provided protruding from one edge perpendicular to the depth direction. Ru. A plurality of parallel conductive patterns are formed on the protruding piece 21 along the protruding direction of the protruding piece 21, forming a so-called card edge connector 20 (see FIG. 5(b)). As shown in FIG. 5, the protruding piece 21 protrudes to the outside of the case 1 through the cover plate 12, and the protruding piece 21 is inserted into a connector stand (not shown) attached to a mounting plate of a panel or the like. By doing so, the interface circuit mounted on the circuit board 2 and the external circuit are connected via the card edge connector 20. Further, a display lamp 16 connected to the interface circuit and displaying the data transmission status is arranged on a closed surface of the case body 11 that is perpendicular to the depth direction. The circuit board 2 is held at both sides by guide grooves (not shown) formed in the inner circumferential surface of the case body 11, and its position is fixed by a holding screw 17 screwed into one end of the guide groove in the longitudinal direction. .

As shown in FIGS. 1 and 2, the interface unit formed as described above is arranged inside the panel 5 with the indicator lamp 16 facing the front side, and the interface unit is placed in the case 1. The depth dimension is formed to be smaller than that of the board 5. To attach the interface unit to the panel 5, after inserting the card edge connector 20 into the connector stand attached to the panel 5, as shown in FIG. , and the mounting screws 4 are screwed into the screw holes 6 formed inside the panel 5. In this way,
Since the case 1 is attached to the panel 5 using the two mounting screws 4, the work of attaching the case to the panel 5 becomes easy. Also,
Since the case 1 is configured to a size that allows it to be placed inside the panel 5, it can be placed in the panel 5 together with the main controller 31 and the like.

[0015]

As described above, in the invention of claim 1, the case is formed to a size that can be placed inside the panel, and the mounting screws that are screwed into the panel are provided with a pair of mounting screws that are inserted from the front side of the panel. Since the mounting holes are provided through each side of the case, it can be installed inside a panel such as a distribution board or relay control board.Moreover, it can be installed from the front side of the panel to the mounting holes of the case. The case can be fixed to the panel by inserting a pair of mounting screws and screwing them into the panel, which has the advantage of making it easy to attach the case to the panel.

[0016] In the invention of claim 2, since the card edge connector protruding from the case is formed on the circuit board,
If a connector stand that is detachably coupled to the card edge connector is provided in the panel, not only mechanical coupling using mounting screws but also electrical connection can be easily performed.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment.

FIG. 2 is a perspective view showing the usage state of the embodiment.

FIG. 3 is an exploded side view showing the embodiment.

FIG. 4 is an exploded plan view showing the embodiment.

FIG. 5 shows an embodiment, in which (a) is a front view, (b) is a side view, (c) is a rear view, and (d) is a plan view.

FIG. 6 is a schematic configuration diagram showing an example of a remote monitoring and control system using the present invention.

FIG. 7 is an explanatory diagram of the operation of a remote monitoring and control system using the present invention.

[Explanation of symbols]

1 case 2　Circuit board 3 Mounting hole 4 Mounting screw 5th board

Claims (2)

[Claims] Claim 1: A case that houses a circuit board on which an interface circuit is mounted, the case being formed in a size that can be placed in a panel such as a distribution board, and mounting screws that are screwed into the panel attached to each panel. 1. An interface unit comprising a pair of mounting holes on both sides, each of which is inserted from the front side of the interface unit. [Claim 2] A protruding piece protruding from the case is provided on the periphery of the distal end of the mounting screw on the circuit board, and the protruding piece forms a card edge connector having a plurality of conductive patterns along the protruding direction. An interface unit according to claim 1, characterized in that: