JPS6315929Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a connection terminal structure for connecting an I/O unit using a photocoupler to a control device such as a sequencer.
The present invention relates to a connection terminal structure suitable for a case where the number of O units and the number of output I/O units vary.

In a control device such as a sequencer to which a large number of external input/output devices are connected, the number of input I/O units and the number of output I/O units used will naturally vary depending on the system to which it is applied. For this reason, in the past, when a sequencer was installed, the number of input I/O units required for the system was determined.
In the conventional method, a single I/O unit and an output I/O unit are prepared separately, and if there is a change in the number of I/O units during the process, a new I/O unit is prepared at that point.

However, if the types of I/O units are classified into input and output, users will be able to keep separate and extra copies of each I/O unit in order to cope with system changes that may occur in the future. In addition, it becomes necessary to produce separate I/O units for each at the production stage, which makes handling inconvenient and increases the total cost per I/O unit. Ta.

The purpose of this invention is to provide a connection terminal structure that allows an I/O unit to be used for both input and output with simple operation.

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the connection state between a sequencer and an I/O unit. Further, FIGS. 2A and 2B are diagrams showing terminal connection states when used as an input I/O unit and when used as an output I/O unit, respectively.

In FIG. 1, a sequencer 1 has a plurality of input/output terminals a, b...n, and each terminal has a connector 2,
I/O units 3, 3 via 2a, 2b...
a, 3b... are connected. Also, connector 2
The I/O unit terminal receiving section has external connection terminal sections 4, 4 having a power terminal, an input/output terminal, and a common terminal.
a, 4b, .

Each I/O unit 3 has four terminals arranged in a row A1 to A4 and terminals B1 to B4 arranged in parallel with these terminals.
It has four terminals arranged in a row. A1~A
Terminal No. 4 and terminals B1 to B4 are line symmetrical. Each I/O unit has a photocoupler consisting of a light emitting part and a light receiving part, and the light emitting part includes an LED light emitting element D1,
Confirmation LED connected in series to this light emitting element D1
It consists of a lamp D2 and a resistor R1 connected between terminals A1 and A2, and the light receiving section includes a light receiving transistor TR1, a light receiving output transistor TR2,
Protection diode D3, resistor R2 connected between terminals B3 and B4, and terminal B3 and transistor
It consists of a resistor R3 connected between TR1.

The output terminal of the light receiving section, that is, the transistor
The collector terminal of TR2 is connected to the terminal A4, and the transistor TR that drives the transistor TR2 is connected to the terminal A4.
1 is connected to terminal B3 via resistor R3. Further, the signal input terminal of the light receiving section, that is, the cathode of the diode D2 is connected to the terminal B1, and the anode of the light emitting element D1 is connected to the terminal A1 via the resistor R1.

On the other hand, the terminal receiving part provided in the connector 2 is composed of terminal receiving parts P1 to P4 and Q1 to Q4, which have the same pitch as each of the above-mentioned terminals A1 to A4 and B1 to B4, and the terminal P1 is the input/output part of the sequencer 1. terminal, terminal P2 to ground, terminal Q2 to power supply
VCC, and terminals P4 and Q3 are connected to the positive and negative poles of the power supply via external connection terminals 4, respectively. Further, the terminal Q4 is connected to an input switch or a load as an external input/output terminal on the sequencer side.
The I/O input/output terminal on the sequencer side is connected to the 3-state input/output element 1a, and the input/output mode is determined by the control signal C applied to the 3-state input/output element.

In the above configuration, as shown in FIG. 2A,
Terminal A4, which is the light receiving output terminal, and sequencer side I/
If the I/O unit 3 is connected so that the terminal receiving part P1, which is the O input/output terminal, corresponds to the terminal receiving part Q4, which is the external input/output terminal on the sequencer side, becomes the external input/output terminal, and the terminal receiving part P1 becomes the It becomes an I/O input terminal. Therefore, when the I/O unit is connected in this way, the terminals X1 and X of the external connection terminal section 4
A power supply E is connected between terminals X2 and X3, and an input switch section S is connected between terminals X2 and X3. In this case, when the input switch section S (actually consists of an electronic switch that turns on and off in response to a sensor, etc.) is turned on, the light emitting element D1 and the lamp D2 light up.
Turn on the light receiving transistors TR1 and TR2 and set the sequencer's I/O input terminal to low level (input available)
Make it. On the other hand, when the input switch section is off, the light emitting element D1 is not driven and therefore the transistors TR1 and TR2 are not turned on, so the above I/O
Set the input terminal to high level (no input). In this way, if the I/O unit 3 is connected so that the terminal A4, which is the light receiving output terminal, corresponds to the terminal receiving part P1, which is the I/O input/output terminal on the sequencer side, the I/O unit 3 can be connected to the input terminal. It will function as a private I/O unit.

On the other hand, as shown in Fig. 2B, the I/O unit 3 should be connected so that the terminal B1, which is the signal input terminal, corresponds to the terminal receiving part P1, which is the I/O input/output terminal on the sequencer side. That is, the second
If the I/O unit itself is removed from the connection state shown in Figure A, rotated 180 degrees, and reconnected, the light receiving output terminal A4 and signal input terminal B1 are located symmetrically, so the external input on the sequencer side The terminal receiving part Q4, which is an output terminal, serves as an external output terminal, and the terminal receiving part P1, which is a sequencer side I/O input/output terminal, serves as an I/O output terminal. When the I/O unit is connected in this way, the terminal
A load L (such as a relay) is connected between terminals X1 and X2, and a power source E is connected between terminals X1 and X3. The operation in this case is that when the output of the 3-state input/output terminal 1a of the sequencer is at a low level (output on), the light emitting element D
1. Lamp D2 lights up and light receiving transistor TR
1. Turn on TR2 and connect the terminal receiving part Q4, which will become the external output terminal, to the negative pole of the power supply E. On the other hand, above 3
When the output of the state input/output element 1a is at a high level (output off), the transistors TR1 and TR2 are also turned off in order to turn off the light emitting element D1, and the conduction between the terminal receiving part Q4 and the negative electrode of the power source E is cut off. Therefore, the load L is driven when the 3-state input/output element 1a outputs a low level output. In this way, terminal B which is the signal input terminal
If the I/O unit 3 is connected so that 1 corresponds to the terminal receiving part P1 which is the sequencer side I/O input/output terminal, that I/O unit will function as an output I/O unit. .

Note that the lamp D2 is used to indicate that the I/O unit 3 is operating.

FIG. 3 shows an external view of the I/O unit 3. As shown in FIG. In the figure, the I/O unit 3 is detachable from the sequencer main body, and the sequencer main body is provided with terminal receiving portions for terminals A1 to A4 and B1 to B4. The I/O unit is mounted by fitting each terminal into these terminal receiving portions. Also,
A label 11 is attached to the upper surface of the cover 10 to indicate whether the I/O unit is used for input or output. Fix the cover 12 on top of the display section "OUT",
When used as an output I/O unit, the blind cover 12 is fixed above the display section "IN". In addition, the above lamp D2 is placed in the center of the label.
are placed to make it easier to check operation from the outside.

In the above embodiment, the total number of terminals of the I/O unit is eight, and they are arranged symmetrically, four on each side, but the number is not limited to eight, and the number of terminals may be greater than that.

As described above, according to this invention, the terminals of the I/O unit are formed in line-symmetrical positions, and
The light receiving output terminal and signal input terminal of the I/O unit are arranged symmetrically, and the terminal receiving part on the control device side (sequencer side) to which these terminals are connected is connected to the external input/output terminal and the I/O input/output terminal. Since I made it a terminal,
By simply changing the connection direction of the I/O unit by 180 degrees, it can be used as an input I/O unit and as an output I/O unit.
Can be used as a unit. Therefore, it is only necessary to prepare one type of I/O unit, which makes handling convenient, and simplifies production management.
There is an advantage that the cost per piece is reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the connection state between a sequencer and an I/O unit. Further, FIGS. 2A and 2B are diagrams showing terminal connection states when used as an input I/O unit and when used as an output I/O unit, respectively. FIG. 3 is an external view of the I/O unit. 1a-3...State input/output element (bidirectional input/output element, 3, 3a, 3b...I/O unit, A1-A4, B1-B4...I/O unit terminal, P1-P4, Q1 ~Q4...Terminal receiving part.

Claims (1)

[Scope of utility model registration request] In the connection terminal structure of an I/O unit that is detachably connected to a control device having bidirectional input/output terminals and has a photocoupler for signal transmission, the terminals of the I/O unit are formed at positions that are line symmetrical. At the same time, the light receiving output terminal and the signal input terminal of the I/O unit are arranged point-symmetrically, and the terminal receiving portions of these terminals on the control device side are used as external input/output terminals and I/O input/output terminals. characterized by
Connection terminal structure of I/O unit.