JPH113142A - Hot-line inserting/ejecting structure for module at programmable controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hot-like inserting/ejecting structure for module with which the exchange work of module is enabled while keeping an electrifying state as it is without using any expensive detecting means. SOLUTION: A module 2 is supported on the mount base 1 through a hook part 7 provided on a mount base 1 so as to be freely turned, terminal parts to be connected to a power supply line 5 and a communication bus line 6a at connectors 3 and 4 provided on the respective mount base 1 and module 2 are successively arranged toward the side of top end away from the turn supporting point of module 2 and when mounting the module 2 on the mount base 1, the power supply line 5 and the communication bus line 6a are connected in this order but when ejecting the module 2 from the mount base 1, the communication bus line 6a and the power supply line 5 are released in this order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-plug structure of a module in a rack-mount type programmable controller (hereinafter abbreviated as PC) for mounting a module on a mount base.

[0002]

2. Description of the Related Art In a rack mount type PC,
By mounting detachably multiple modules corresponding to various functions on the mount base of the rack and connecting them to the lead wires wired to the mount base in the mounted state via connectors, failures or control contents can be Modules can be replaced at any time in response to changes. In general,
As a module of this type, a module that is detachably mounted in a pendulum type via a fulcrum is known in order to improve the mountability by eliminating inconvenience due to erroneous mounting at the time of insertion or twisting of a terminal. When the module is mounted, the connection is made in order from the fulcrum in accordance with the arrangement of the pin terminals of the connector, and when the module is extracted, the connection is made in order from the side far from the fulcrum. Therefore, when a module is inserted or removed while the system is powered on, the terminals of the connector that are inserted and removed at the time of insertion and removal are sequentially connected (at the time of insertion) or disconnected (at the time of extraction), so that the power supply line, The connection of the bus lines becomes temporarily non-uniform, causing phenomena such as a short circuit of a signal and an abnormal signal level. Therefore, when performing this type of module replacement, it is necessary to temporarily turn off the power of the entire system and then replace the module, and if the system cannot be stopped, the replacement may not be possible.

Therefore, in the hot-swap method disclosed in, for example, Japanese Patent Application Laid-Open No. 5-81968, a module is provided with a photo interrupter to detect a connection state, and the connection of the bus line is confirmed by a detection signal of the photo interrupter. Thus, a method of turning on the power of the module is shown.

[0004]

However, in this method, the provision of the photointerrupter in the module has a disadvantage that the unit price of the module is high. In addition, in order to surely detect the connection of the terminal pin group, the method is required. Precision was required for optical arrangement, and processing was troublesome. In such a situation, the present applicant connects power supply to the internal circuit of the module and then connects to the bus line. Alternatively, attention has been paid to the fact that malfunction due to uneven connection can be prevented. The present invention has been made based on the above viewpoints, and an object of the present invention is to provide a module for a PC in which a module can be replaced while power is on without using expensive detection means such as a photo interrupter. The present invention provides a hot-swap structure.

[0005]

According to a first aspect of the present invention, there is provided a programmable controller in which a module is detachably mounted on a mount base on which a communication bus line is installed. A locking means for rotatably supporting the module is provided on the base, and an interconnecting portion of a power supply line and a communication bus line wired to each of the mount base and the module is connected to the module with respect to the locking means. The modules are sequentially arranged toward the distal end side from the fulcrum, and are connected in the order of a power supply line and a bus line when the module is mounted on the mount base, and are connected in the order of a bus line and a power supply line when the module is separated from the mount base. It is characterized by being released. .

According to a second aspect of the present invention, the module includes a filter unit for preventing a supply voltage from dropping due to a load change, and a reset circuit for initializing a circuit unit in the module. The reset circuit cancels a reset signal by power supply and connection of a bus line to initialize the circuit section.

When the module is attached or detached, the power supply line and the communication bus line are connected in this order in accordance with the rotation operation when the module is connected, and the communication bus line and the power supply line are disconnected in the order of disconnection when the connection is released. It is possible to prevent a power-off state from occurring even though the bus line is connected, and thus to prevent the above-described problem. Alternatively, the load fluctuation of the power supply due to the insertion / removal of the module is suppressed by the filter unit, and the internal circuit of the module is initialized by the supply of the power and the connection of the bus line, thereby enabling normal data transmission / reception.

[0008]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an explanatory view showing a mounted state of a module according to the present invention on a mount base, and FIG. 2 is a block diagram showing an internal circuit of the module. In FIG. 1, the hot-swap structure of a module in a PC includes a rack mount base 1 on which a communication bus line is installed and a module 2 detachably mounted on the mount base 1. The module 2 is shown as a casing of the module 2.

A bus connector 3 is mounted on the mount base 1.
Are vertically arranged, and a connector 4 having a large number of terminals connected to the bus connector 3 is disposed in a casing of the module 2 arranged to face the connector 3. 2 is connected to the power supply line 5 installed on the mount base 1 side.
And a communication bus line 6a of the CPU module 6 (see FIG. 2). On the upper part of the mount base 1, a mounting hook 7 serving as a locking means for rotatably supporting the module 2 is arranged. A fulcrum pin 8 serving as a rotation fulcrum is integrally formed with the fulcrum pin 8 and a mounting screw 9 is provided at an end of the module facing the fulcrum pin 8.

Therefore, when the module 2 having the above structure is mounted on the mount base 1, as shown in FIG. The module 2 is rotated clockwise from the fulcrum pin 8 as shown in FIG. As a result, the module 2 is sequentially inserted and fitted into the mount base 1 side connector 3 from the position where the connector 4 is close to the fulcrum pin 8, and the corresponding terminals are sequentially connected. When the module 2 is attached to the rear surface of the mount base 1 by the rotation operation, the mounting screw 9 is screwed into the boss cut into the mount base 1 so that the module 2 is completely fixed. Thus, the connection between the connectors 3 and 4 is completed.
When the module 2 is to be removed, the mounting screw 9 may be removed from the boss of the mount base 1 and then removed in the reverse procedure.

In the above configuration, the terminal arrangement of the connectors 3 and 4 is arranged in order from the base side, that is, from the side near the fulcrum pin 8, the power supply line 5 and the wiring constituting the communication bus line 6a on the CPU module 6 side. They are arranged in order. Therefore, when the module is mounted by the above operation, the power supply line 5 is connected to the communication bus line 6a in this order, and when the module is removed, the communication bus line 6a and the power supply line 5 are extracted in this order.

In addition to the above configuration, the module 2 includes
As shown in FIG. 2, the power supply line 5 is connected to a bus I / F (interface) unit 11 as an internal circuit and an external I / F.
An F (interface) circuit 12 is provided with a filter unit 13 interposed therebetween.
Is connected to the module 2 to prevent a power supply voltage drop when the internal circuit is started. In addition, a reset circuit 14 is provided in the module 2.
4 holds the bus I / F unit 11 and the external interface circuit 12 in a non-initialized state even when the power supply line 5 is connected and in an energized state in a non-detection state of a signal from the communication bus line 6a. Each of them is initialized by detecting a signal from the bus line 6a. Therefore,
The module 2 is completely attached to the mount base 1, that is, the power supply line 5 and the communication bus line 6
In a state in which all “a” are connected, each circuit section in the module 2 rises at the same time, and transmits and receives data to and from the CPU module 6. Further, at the time of removal, the connection is sequentially disconnected from the communication bus line 6a side, but at this moment all the circuit parts are reset, and are in the non-initialized state.

[0013]

As is apparent from the above description, in the hot-swap structure of a module in a PC according to the present invention, a power-off state occurs even though a bus line is connected at the time of insertion and removal. Since there is no power supply, it is possible to prevent problems caused by this, and to replace modules without turning off the power of the entire system. Therefore, the present invention is suitable for reducing the time required for module replacement.
Further, since a sensor for detecting the connection of the connector as in the conventional structure is not required, the structure can be simple and inexpensive. Furthermore, the load fluctuation of the power supply due to the insertion / removal of the module is suppressed by the filter unit, and the internal circuit of the module is initialized by the power supply and the connection of the bus line,
With the configuration that enables data transmission / reception, malfunction when mounting or removing the module can be completely suppressed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating mounting of a module on a mount base according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal circuit of the module.

[Explanation of symbols]

 Reference Signs List 1 rack mount base 2 module 3 bus connector 4 connector 5 power supply line 6 CPU module 6a communication bus line 7 hook 8 fulcrum pin 11 bus I / F 12 external I / F circuit 13 filter 14 reset circuit

Claims (2)

[Claims] 1. A programmable controller for detachably mounting a module on a mount base on which a communication bus line is installed, wherein said mount base is provided with locking means for rotatably supporting said module. Interconnecting portions of a power supply line and a communication bus line wired to each of the modules are sequentially arranged toward the distal end side from a fulcrum of rotation of the module with respect to the locking means, and when the module is mounted on the mount base, A hot-swap structure for a module in a programmable controller, wherein a power supply line and a bus line are connected in this order, and the module is released in the order of a bus line and a power supply line when the module is detached from the mount base. 2. A module, comprising: a filter unit for preventing a supply voltage from dropping due to a load change; and a reset circuit for initializing a circuit unit in the module. The reset circuit includes a power supply and a bus line. 2. A hot-swap structure for a module in a programmable controller according to claim 1, wherein a reset signal is released by said connection to initialize said circuit section.