CN101854112A - Interface circuit - Google Patents
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- CN101854112A CN101854112A CN 201010144272 CN201010144272A CN101854112A CN 101854112 A CN101854112 A CN 101854112A CN 201010144272 CN201010144272 CN 201010144272 CN 201010144272 A CN201010144272 A CN 201010144272A CN 101854112 A CN101854112 A CN 101854112A
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Abstract
Output interface circuit comprises: the terminal that is connected with external equipment, the source type usefulness level shifting circuit that is connected with terminal, leakage type level shifting circuit, dual-in-line switch and the control device that is connected with terminal.The operator operates the dual-in-line switch and when selecting source type output associative mode, and the source type converts behind the high level output signal level of control device towards outside equipment output to level shifting circuit.The operator operates the dual-in-line switch and when selecting leakage type output associative mode, and the leakage type converts behind the high level output signal level of control device towards outside equipment output to level shifting circuit.Input interface circuit comprises: the terminal that is connected with external equipment, dual-in-line switch, the leakage type usefulness level shifting circuit that is connected with terminal, source type level shifting circuit and the control device that is connected with terminal.The operator operates the dual-in-line switch and when selecting leakage type input associative mode, and the leakage type will be input control device after the low level from the level conversion of the input signal of terminal with level shifting circuit.The operator operates the dual-in-line switch and when selecting source type input associative mode, and the source type will be converted to input control device after the low level from the incoming signal level of terminal with level shifting circuit.
Description
Technical field
The present invention relates to a kind of towards outside equipment output source type (positive-negative-positive) signal or leakage type (NPN type) signal interface circuit and from the interface circuit of external equipment input source type signal or leakage type signal.
Background technology
The numerical control device of lathe comprises towards the interface circuit of the signal of the interface circuit of outside apparatus output signal and input external equipment.When the input/output signal of external equipment was source type signal, numerical control device used source type interface circuit.When the input/output signal of external equipment was leakage type signal, numerical control device used leakage type interface circuit.When the type of the type of the interface circuit of numerical control device and the input/output signal of external equipment did not match, the operator need change the interface circuit of numerical control device.
The control basal plate (numerical control device) of No. 3700315 record of Japanese patent gazette patent comprises fixing base and mounting or dismounting substrate.Fixing base comprises control part.The mounting or dismounting substrate can be installed and removed with respect to fixing base.The mounting or dismounting substrate comprises the imput output circuit portion (interface circuit) of terminal board and leakage type or source type.The shared above-mentioned control part of the imput output circuit portion of leakage type and source type.Control basal plate comprises the mounting or dismounting substrate of leakage type imput output circuit portion by replacing and comprises the mounting or dismounting substrate of source type imput output circuit portion, can tackle the input/output signal of external equipment.
In order to change the mounting or dismounting substrate, the operator has to prepare in advance two kinds of mounting or dismounting substrates.Therefore, be difficult to cut down the manufacturing expense of control basal plate.In the time of will installing and removing substrate and switch to leakage type or source type, the operator need carry out exchanging operation.Switch to leakage type or source type and be not easy.
Summary of the invention
The object of the present invention is to provide and a kind ofly can easily switch to leakage type or source type and can cut down the interface circuit of manufacturing expense.
The interface circuit of technical scheme 1 can switch between second output state of first output state of output source type signal and output leakage type signal, comprise: be used for the first terminal and second terminal that are connected with external equipment, first change-over circuit that is connected with above-mentioned the first terminal, second change-over circuit that is connected with above-mentioned second terminal, select the selector switch of above-mentioned first output state or second output state, and the control device of controlling the action of above-mentioned first change-over circuit and second change-over circuit according to the selection of this selector switch, when stating first output state in the choice, above-mentioned first change-over circuit is changed the source type output signal level of above-mentioned control device, when stating second output state in the choice, above-mentioned second change-over circuit is changed the leakage type output signal level of above-mentioned control device.
In the interface circuit of the present invention, select first output state and second output state with selector switch, control device is controlled the action of first change-over circuit and second change-over circuit according to the selection of selector switch.When selecting first output state, first change-over circuit is exported the output signal level conversion back of control device towards the first terminal.When selecting second output state, second change-over circuit is exported the output signal level conversion back of control device towards second terminal.The operator can easily switch to interface circuit leakage type or source type by operating selection switch.
In the interface circuit of technical scheme 2, above-mentioned selector switch can be selected the 3rd output state of output source type signal and leakage type signal, when stating the 3rd output state in the choice, above-mentioned first change-over circuit and second change-over circuit are changed the source type output signal and the leakage type output signal level of above-mentioned control device.
In the interface circuit of technical scheme 3, above-mentioned first change-over circuit comprises: be located at first switch element between the high power supply of the above-mentioned output signal level of above-mentioned the first terminal and level ratio and move and control the first transistor of the action of above-mentioned first switch element according to above-mentioned output signal, above-mentioned second change-over circuit comprises: the transistor seconds of being located at the second switch element between above-mentioned second terminal and the ground connection and moving and control the action of above-mentioned second switch element according to above-mentioned output signal.
In the interface circuit of technical scheme 4, when selecting above-mentioned first output state with above-mentioned selector switch, above-mentioned control device is controlled to above-mentioned second switch element all the time and connects, when selecting above-mentioned second output state with above-mentioned selector switch, above-mentioned control device is controlled to above-mentioned first switch element all the time and connects.
In the interface circuit of technical scheme 5, above-mentioned first switch element and second switch element are FET (field-effect transistors).
The interface circuit of technical scheme 6 can and be used at first input state that is used to import type signal leakage switching between second input state of input source type signal, comprise: the first terminal that is connected with external equipment and second terminal, select the selector switch of above-mentioned first input state or second input state, be located at first resistance between above-mentioned the first terminal and the power supply, first bypass circuit that between above-mentioned the first terminal and above-mentioned power supply, is arranged in parallel with above-mentioned first resistance, be located at second resistance between above-mentioned second terminal and the ground connection, second bypass circuit that between above-mentioned second terminal and above-mentioned ground connection, is arranged in parallel with above-mentioned second resistance, and control being connected and the control device that be connected of above-mentioned second terminal of above-mentioned the first terminal and above-mentioned power supply with above-mentioned ground connection according to the selection of doing with above-mentioned selector switch, when selecting above-mentioned first input state, above-mentioned control device connects above-mentioned the first terminal and above-mentioned power supply by above-mentioned first resistance, and connect above-mentioned second terminal and above-mentioned ground connection by above-mentioned second bypass circuit, when selecting above-mentioned second input state, above-mentioned control device connects above-mentioned the first terminal and above-mentioned power supply by above-mentioned first bypass circuit, and connects above-mentioned second terminal and above-mentioned ground connection by above-mentioned second resistance.
In the interface circuit of the present invention, the operator selects first input state or second input state with selector switch.During first input state, control device makes first bypass circuit invalid, connects the first terminal and power supply by first resistance.During second input state, control device makes second bypass circuit effective, directly connects second terminal and ground connection.
In the interface circuit of technical scheme 7, above-mentioned selector switch can select to be used for importing from external equipment the 3rd input state of leakage type signal and source type signal, when selecting above-mentioned the 3rd input state, above-mentioned control device connects above-mentioned the first terminal and above-mentioned power supply by above-mentioned first resistance, and connects above-mentioned second terminal and above-mentioned ground connection by above-mentioned second resistance.
In the interface circuit of technical scheme 8, above-mentioned first bypass circuit comprises first switch element, above-mentioned second bypass circuit comprises the second switch element, when selecting above-mentioned first input state, above-mentioned control device disconnects above-mentioned first switch element and connects above-mentioned second switch element, when selecting above-mentioned second input state, above-mentioned control device is connected above-mentioned first switch element and is disconnected above-mentioned second switch element.
In the interface circuit of technical scheme 9, above-mentioned first switch element and second switch element are FET.
In the interface circuit of technical scheme 10, comprising: conversion is from first change-over circuit of the level of the leakage type input signal of above-mentioned the first terminal and conversion second change-over circuit from the level of the source type input signal of above-mentioned second terminal.
In the interface circuit of technical scheme 11, above-mentioned first change-over circuit comprises: the first transistor that moves according to the input signal from above-mentioned the first terminal and first pull-up resistor that is connected with the collector electrode of this first transistor, above-mentioned second change-over circuit comprises: transistor seconds that moves according to the input signal from above-mentioned second terminal and second pull-up resistor that is connected with the collector electrode of this transistor seconds.
According to the invention of technical scheme 1, when selecting first output state with selector switch, first change-over circuit is exported the output signal level conversion back of control device towards the first terminal.When selecting second output state with selector switch, second change-over circuit is exported the output signal level conversion back of control device towards second terminal.Operator's operating selection switch can easily switch to leakage type or source type.The operator needn't be in order to switch to leakage type or source type and is prepared multiple substrate.Interface circuit can be cut down manufacturing expense.
According to the invention of technical scheme 2, selector switch can be selected the 3rd output state of external portion equipment output source type signal and leakage type signal.Operator's operating selection switch and when selecting the 3rd output state, the operator can be connected external equipment under the external equipment of leakage type and source type and the state of depositing with interface circuit.
According to the invention of technical scheme 3, first change-over circuit comprises first switch element and the first transistor.First switch element is connected with above-mentioned the first terminal and power supply.The above-mentioned output signal level height of the level ratio of this power supply.The first transistor moves according to above-mentioned output signal, and the action of above-mentioned first switch element is controlled.The 2nd change-over circuit comprises second switch element and transistor seconds.The second switch element is connected with above-mentioned second terminal and ground connection.Transistor seconds moves according to above-mentioned output signal, and the action of above-mentioned second switch element is controlled.It is simple that the structure of interface circuit becomes.
According to the invention of technical scheme 4, when selecting first output state with selector switch, control device is controlled to the second switch element all the time and connects.When selecting second output state with selector switch, control device is controlled to first switch element all the time and connects.When the operator switched to leakage type or source type with interface circuit, the circuit structure of control device was constant.The operator can promptly switch to control device leakage type or source type.
According to the invention of technical scheme 5, first switch element and second switch element are made of FET.FET is more small-sized than optical coupler.It is small-sized when the interface circuit ratio uses optical coupler.Interface circuit can be cut down manufacturing expense.
According to the invention of technical scheme 6, the operator selects first input state or second input state with selector switch.During first input state, control device makes first bypass circuit invalid, connects the first terminal and power supply by first resistance.During second input state, control device makes second bypass circuit effective, directly connects second terminal and ground connection.
The operator selects first input state or second input state according to the type of the output signal of external equipment with selector switch.The operator can easily switch to interface circuit leakage type or source type.The operator needn't be in order to switch to leakage type or source type and is prepared multiple substrate, and interface circuit can be cut down manufacturing expense.First resistance is located between the first terminal and the power supply.Second resistance is located between second terminal and the ground connection.When external equipment was connected with the first terminal or second terminal, interface circuit prevented that reliably overcurrent from flowing through external equipment.
According to the invention of technical scheme 7, selector switch can be selected from the 3rd input state of external equipment input leakage type input signal and source type input signal.Operator's operating selection switch and when selecting the 3rd input state, control device connects the first terminal and power supply by first resistance, and connects second terminal and above-mentioned ground connection by second resistance.The external equipment of leakage type and source type and when depositing, the operator can easily be connected external equipment on the first terminal and second terminal.
According to the invention of technical scheme 8, first bypass circuit comprises first switch element, and second bypass circuit comprises the second switch element.When the operator selected first input state, control device disconnected first switch element, connected the second switch element.When the operator selected second input state, control device was connected above-mentioned first switch element, disconnected the second switch element.When switching to first input state and second input state, the polarity of the first terminal and second terminal does not change.When the operator had selected first input state and second input state mistakenly, interface circuit can not apply back voltage to external equipment.
According to the invention of technical scheme 9, first switch element and second switch element are made of FET.When existing optical coupler replaced with FET, the number of spare parts of interface circuit did not increase the producer with switch element.FET is more small-sized than optical coupler.Interface circuit can be cut down manufacturing expense.
According to the invention of technical scheme 10, operator's operating selection switch and when selecting first input state, first change-over circuit will be exported towards control device after will being converted to low level from the input signal of the first terminal for example.When the operator selected second input state with selector switch, second change-over circuit was exported towards control device after will being converted to low level from the input signal of second terminal.Input interface circuit is installed on first change-over circuit and second change-over circuit on the substrate.Input interface circuit can switch between leakage type and source type with a substrate.
According to the invention of technical scheme 11, first change-over circuit comprises the first transistor and first pull-up resistor.The first transistor moves according to the input signal from the first terminal.First pull-up resistor is connected with the collector electrode of the first transistor.Above-mentioned second change-over circuit comprises the transistor seconds and second pull-up resistor.Transistor seconds moves according to the input signal from second terminal.Second pull-up resistor is connected with the collector electrode of transistor seconds.First change-over circuit and second change-over circuit use the transistor more small-sized than optical coupler, can realize the miniaturization of substrate.Input interface circuit can be cut down manufacturing expense.
Description of drawings
Fig. 1 is the figure of substrate that expression is equipped with the output interface circuit of execution mode 1.
Fig. 2 is the block diagram of output interface circuit.
Fig. 3 (a) is the figure of the source type input part of expression external equipment, and Fig. 3 (b) is the figure of the leakage type input part of expression external equipment.
Fig. 4 is the figure of the state of dual-in-line switch in each pattern of expression.
Fig. 5 is the key diagram of the state of terminal in each pattern of expression.
Fig. 6 is the figure of substrate that expression is equipped with the input interface circuit of execution mode 2.
Fig. 7 is the block diagram of input interface circuit.
Fig. 8 (a) is the figure of the leakage type switch element of expression external equipment, and Fig. 8 (b) is the figure of the source type switch element of expression external equipment.
Fig. 9 is the figure of the state of dual-in-line switch in each pattern of expression.
Figure 10 is the key diagram of the state of terminal in each pattern of expression.
Figure 11 is the figure of substrate that expression is equipped with the input/output interface circuit of execution mode 3.
Embodiment
Accompanying drawing below with reference to the desirable execution mode 1 of expression describes the present invention in detail.
Dual-in- line switch 8,9 can be selected source type output associative mode (first output state), leakage type output associative mode (second output state) or leakage type/source type and deposit output associative mode (the 3rd output state).Source type output associative mode is meant the state of output interface circuit 1 towards outside equipment 50 output source type signals.Leakage type output associative mode is meant the state of output interface circuit 1 towards outside equipment 50 output leakage type signals.Leakage type/source type and deposit output associative mode be meant towards the state of outside equipment 50 output source type signals and leakage type signal.
As shown in Figure 4, the operator is set at dual-in-line switch 8 and connects and dual-in-line switch 9 is set at when disconnecting, and output interface circuit 1 becomes source type output associative mode.Dual-in-line switch 8 is set at disconnects and dual-in-line switch 9 is set at when connecting, output interface circuit 1 becomes leakage type output associative mode.Dual-in-line switch 8 is set at connects and dual-in-line switch 9 is set at when connecting, output interface circuit 1 becomes leakage type/source type and deposits the output associative mode.
Below output circuit portion 20 is described.32 output circuit portions 20 all have identical structure.
As shown in Figure 1 and Figure 2, output circuit portion 20 has: terminal A (the first terminal), terminal B (second terminal), FET drive circuit 21, source type level shifting circuit (first change-over circuit) 24 and leakage type level shifting circuit (second change-over circuit) 25.Terminal A, B are disposed at the port of terminal board 10.Terminal A, B are connected with external equipment 50.
Shown in Fig. 3 (a), when the operator connected the external equipment 50 of source type on output interface circuit 1, the operator was connected terminal A with the terminal C of source type input part 51.The operator is connected terminal B with the GND terminal D that is located at external equipment 50.
Source type input part 51 comprises: imported switch element 52 in the source of external equipment 50 (below be called switch element 52) and resistance 53,54.Shown in Fig. 3 (a), resistance 53 is connected between the base stage of terminal C and switch element 52.The base stage of switch element 52 is connected with emitter by resistance 54.The emitter of switch element 52 is connected with GND terminal D.
When connecting the external equipment 50 of leakage type on output interface circuit 1, shown in Fig. 3 (b), the operator is connected terminal A with the power supply terminal E of external equipment 50.The operator is connected terminal B with the terminal F of leakage type input part 55.Leakage type input part 55 comprises: leak imported switch element 56 (below be called switch element 56) and resistance 57,58.
Shown in Fig. 3 (b), the base stage of terminal F and switch element 56 is connected by resistance 57.The base stage of switch element 56 is connected with emitter by resistance 58.The emitter of switch element 56 is connected with power supply terminal E.
As shown in Figure 2, the source type is that to convert 24V to be output signal level to output signal level with level shifting circuit 24 with 3.3V.It is that the signal of level is exported towards terminal A that the source type will convert 24V to level shifting circuit 24.Control device 3 utilizes the signal of 3.3V system to move.External equipment 50 utilizes the signal of 24V system to move.
The source type has with level shifting circuit 24: as the NPN transistor 32 of the first transistor (below be called transistor 32) and as the PMOS-FET35 of first switch element (below be called FET35).
The base stage of transistor 32 is connected with FET drive circuit 21 by resistance 31.Pass through resistance 30 ground connection between FET drive circuit 21 and the resistance 31.The collector electrode of transistor 32 is connected with the grid of FET35 by resistance 34.The grounded emitter of transistor 32.The base stage of transistor 32 is by resistance 33 ground connection.The grid of FET35 is connected with the power supply 36 of 24V by resistance 37.The source electrode of FET35 is connected with the power supply of 24V 36.The drain electrode of FET35 is connected with terminal A.
As shown in Figure 2, leakage type is that to convert 24V to be output signal level to output signal level with level shifting circuit 25 with 3.3V.It is that the signal of level is exported towards terminal B that the leakage type will convert 24V to level shifting circuit 25.The leakage type has with level shifting circuit 25: as the NPN transistor 42 of transistor seconds (below be called transistor 42) and as the NMOS-FET45 of second switch element (below be called FET45).Transistor 42 moves according to the output signal of FET drive circuit 21.FET45 drives according to the action of transistor 42.
The base stage of transistor 42 is connected with FET drive circuit 21 by resistance 41.Pass through resistance 40 ground connection between FET drive circuit 21 and the resistance 41.The collector electrode of transistor 42 is connected with the grid of FET45.The grounded emitter of transistor 42.The base stage of transistor 42 is by resistance 43 ground connection.The grid of FET45 is connected with the power supply 46 of 24V by resistance 47.The drain electrode of FET45 is connected with terminal B.The source ground of FET45.The grid of FET45 is by resistance 44 ground connection.Diode 48 is connected between terminal A and the terminal B.Diode 48 absorbs overcurrent (surge current).Diode 48 can omit.
Action to output interface circuit 1 describes below.
Shown in Fig. 2, Fig. 3 (a), when the operator was connected with terminal A the external equipment 50 of source type with terminal B, the operator operated dual-in- line switch 8,9, selected source type output associative mode.Transistor 42 disconnects all the time according to the driving of FET drive circuit 21.
FET45 connects because of transistor 42 disconnects all the time all the time.The source electrode of FET45 and drain electrode conducting.Therefore, terminal B ground connection.As shown in Figure 5, terminal B works as the terminal of supplying with GND (0V).
FET35 carries out on/off according to the output signal of control device 3.Terminal A works as source type output terminal.
When control device 3 received the output signal of " L " level, transistor 32 disconnected the base stage of transistor 32 by FET drive circuit 21.When transistor 32 disconnected, FET35 disconnected.Therefore, the current potential of terminal A becomes high impedance status.When control device 3 received the output signal of " H " level, connected by transistor 32 by FET drive circuit 21 for the base stage of transistor 32.When transistor 32 was connected, FET35 connected, the source electrode of FET35 and drain electrode conducting.Therefore, the potential change of terminal A is 24V.
Shown in Fig. 2, Fig. 3 (b), with terminal A, when B is connected, the operator operates dual-in- line switch 8,9 to the operator with the external equipment 50 of leakage type, selects leakage type output associative mode.Transistor 32 is connected all the time according to the driving of FET drive circuit 21.
When transistor 32 was connected, FET35 connected all the time, the source electrode of FET35 and drain electrode conducting.Therefore, terminal A is connected with the power supply 36 of 24V.As shown in Figure 5, terminal A works as the terminal of supplying with the 24V power supply.
FET45 carries out on/off according to the output signal of control device 3.Terminal B works as leaking type output terminal.
When control device 3 received the output signal of " H " level, connected by transistor 42 by FET drive circuit 21 for the base stage of transistor 42.When transistor 42 was connected, FET45 disconnected.Therefore, the current potential of terminal B becomes high impedance status.When control device 3 received the output signal of " L " level, transistor 42 disconnected the base stage of transistor 42 by FET drive circuit 21.When transistor 42 disconnected, FET45 connected, and the source electrode of FET45 and drain electrode are connected.Therefore, the potential change of terminal B is GND (0V).
With the terminal A of 32 output circuit portions 20, when B is connected, the operator operates dual-in- line switch 8,9 to the operator, selects leakage type/source type also to deposit the output associative mode with the external equipment 50 of the external equipment 50 of source type and leakage type.FET35 carries out on/off according to the output signal of control device 3.Terminal A works as source type output terminal.FET45 carries out on/off according to the output signal of control device 3.Terminal B works as leaking type output terminal.Action afterwards is the same during with above-mentioned situation.
Effect, effect to output interface circuit 1 describes below.
When having selected source type output associative mode with dual-in- line switch 8,9, the source type is exported the output signal level conversion back of control device 3 with level shifting circuit 24 towards terminal A.When having selected leakage type output associative mode with dual-in- line switch 8,9, the leakage type is exported the output signal level conversion back of control device 3 with level shifting circuit 25 towards terminal B.The operator operates dual-in- line switch 8,9, can easily switch to leakage type or source type.The operator needn't be in order to switch to leakage type or source type and is prepared multiple substrate.Output interface circuit 1 can be cut down manufacturing expense.
Dual-in- line switch 8,9 can be selected the leakage type/source type of external portion equipment 50 output source type signals and leakage type signal and deposit the output associative mode.The operator operates dual-in- line switch 8,9 and when selecting leakage type/source type and depositing the output associative mode, and the operator can be connected external equipment 50 under the external equipment 50 of leakage type and source type and the state of depositing with output interface circuit 1.
The source type comprises FET35 and transistor 32 with level shifting circuit 24.FET35 is connected with terminal A and power supply 36.The above-mentioned output signal level height of the level ratio of power supply 36.Transistor 32 moves according to above-mentioned output signal, and the action of FET35 is controlled.The leakage type comprises FET45 and transistor 42 with level shifting circuit 25.FET45 is connected with terminal B and ground connection.Transistor 42 moves according to above-mentioned output signal, and the action of FET45 is controlled.It is simple that the structure of output interface circuit 1 becomes.
When having selected source type output associative mode with dual-in- line switch 8,9, control device 3 is controlled to FET45 all the time and connects.When having selected leakage type output associative mode with dual-in- line switch 8,9, control device 3 is controlled to FET35 all the time and connects.When switching to leakage type or source type, the circuit structure of control device 3 is constant.The operator can promptly switch to control device 3 leakage type or source type.
FET35 and FET45 are more small-sized than optical coupler.It is small-sized when output interface circuit 1 ratio uses optical coupler.
Because the source type uses transistor array with level shifting circuit 24 and leakage type with level shifting circuit 25, so circuit scale diminishes.Substrate 2 can not maximize.
Below to partial alteration the variation of execution mode 1 describe.
1) number of output circuit portion 20 can change according to the input subnumber of external equipment 50.The number of output circuit portion 20 also can not be 32.The port of terminal board 10 also can be selected source type output associative mode, leakage type output associative mode, leakage type/source type and deposit the output associative mode by per 8 ports.The port of terminal board 10 also can be selected source type output associative mode, leakage type output associative mode, leakage type/source type and deposit the output associative mode by per 1 port.
2) output interface circuit 1 also can omit leakage type/source type and deposit the input associative mode.In this case, the dual-in-line switch also can be one.
3) the source type with level shifting circuit 24 and leakage type with level shifting circuit 25 with 3.3V be output signal level to be converted to 24V be output signal level, but also can be with the level conversion of the signal of control device 3 structure for the level corresponding with the signal of external equipment.For example, the source type can be the level that output signal level is converted to same degree with 3.3V with level shifting circuit 24 and leakage type also with level shifting circuit 25.The source type also can be that output signal level is converted to the level lower than 3.3V with level shifting circuit 24 and leakage type with 3.3V with level shifting circuit 25.
Accompanying drawing below with reference to the desirable execution mode 2 of expression describes the present invention in detail.
The structure of input interface circuit 11 is described according to Fig. 6.
Dual-in- line switch 18,19 can be selected leakage type input associative mode (first input state), source type input associative mode (second input state) or leakage type/source type and deposit input associative mode (the 3rd input state).Leakage type input associative mode is meant from the state of external equipment 150 input leakage type signals.Source type input associative mode is meant from the state of external equipment 150 input source type signals.Leakage type/source type is also deposited the input associative mode and is meant from the state of external equipment 150 input leakage type signals and source type signal.
As shown in Figure 9, the operator is set at dual-in-line switch 18 and connects and dual-in-line switch 19 is set at when disconnecting, and input interface circuit 11 becomes source type input associative mode.Dual-in-line switch 18 is set at disconnects and dual-in-line switch 19 is set at when connecting, input interface circuit 11 becomes leakage type input associative mode.Dual-in-line switch 18 is set at connects and dual-in-line switch 19 is set at when connecting, input interface circuit 11 becomes leakage type/source type and deposits the input associative mode.
Below input circuit portion 200 is described.32 input circuit portions 200 all have identical structure.
As Fig. 6, shown in Figure 7, input circuit portion 200 has: terminal J (the first terminal), terminal K (second terminal), FET drive circuit 210, VCC bypass circuit (first bypass circuit) 220, GND bypass circuit (second bypass circuit) 230, leakage type level shifting circuit (first change-over circuit) 240, source type level shifting circuit (second change-over circuit) 250.Terminal J, K are disposed at the port of terminal board 60.
With terminal J, when K is connected, the operator operates dual-in- line switch 18,19 to the operator with the external equipment 150 of leakage type, selects leakage type input associative mode.With terminal J, when K is connected, the operator operates dual-in- line switch 18,19 to the operator with the external equipment 150 of source type, selects source type input associative mode.The operator is with the terminal J of the external equipment 150 of leakage type and each port and not shown shared GND terminal is connected and when the terminal K of the external equipment 150 of source type and each port and not shown shared 24V terminal be connected, the operator operates dual-in- line switch 18,19, selects leakage type/source type and deposits the input associative mode.
As shown in Figure 7, VCC bypass circuit 220 comprises: as PMOS-FET130 of first switch element (below be called FET130) and diode 131.The grid of FET130 is connected with FET drive circuit 210.The drain electrode of FET130 is connected with terminal J and Zener diode 134 by diode 131.The source electrode of FET130 is connected with the power supply of 24V 132.Power supply 132 is connected by resistance 133 (first resistance) with terminal J.Resistance 133 is in parallel with VCC bypass circuit 220.The overcurrent that prevents resistance 133 flows through external equipment 150.
A plurality of input circuit portion 200 is arranged, and when 200 in a plurality of input circuit portion being connected a shared FET140, diode 131,141 prevents spreading of electric current.When input circuit portion 200 was one, input interface circuit 11 can omit diode 131,141.Control device 13 is exported control signals by FET drive circuit 210 towards FET130,140.Control device 13 utilizes above-mentioned control signal that FET130,140 action are controlled.VCC bypass circuit 220 and GND bypass circuit 230 are by FET130,140 be switched on or switched off and become effective or invalid (conducting or cut-out).
Below the leakage type is described with level shifting circuit 250 with level shifting circuit 240 and source type.
The leakage type has with level shifting circuit 240: NPN transistor (the first transistor) 137 and pull-up resistor (first pull-up resistor) 139.
The base stage of NPN transistor 137 is connected with terminal J by Zener diode 134 and resistance 135.The collector electrode of NPN transistor 137 is connected with the input/output interface 17 of control device 13.The grounded emitter of NPN transistor 137.The base stage of NPN transistor 137 is connected with the emitter of NPN transistor 137 by resistance 136.
3.3V power supply 138 and the collector electrode of NPN transistor 137 be connected by pull-up resistor 139.NPN transistor 137 is moved according to the input signal from terminal J.
The leakage type will be converted to 3.3V from 24V from the level of the input signal of terminal J with level shifting circuit 240.The leakage type is exported the switched input signal of level by input/output interface 17 with level shifting circuit 240 towards control device 13.External equipment 150 moves with 24V.Control device 13 moves with 3.3V.
The source type has with level shifting circuit 250: NPN transistor (transistor seconds) 147 and pull-up resistor (second pull-up resistor) 149.
The base stage of NPN transistor 147 is connected with terminal K by Zener diode 144 and resistance 145.The collector electrode of NPN transistor 147 is connected with the input/output interface 17 of control device 13.The grounded emitter of NPN transistor 147.The base stage of NPN transistor 147 is connected with emitter by resistance 146.3.3V power supply 148 and the collector electrode of NPN transistor 147 be connected by pull-up resistor 149.NPN transistor 147 is moved according to the input signal from terminal K.
The source type will be converted to 3.3V from 24V from the level of the input signal of terminal K with level shifting circuit 250.The source type is exported the switched input signal of level by input/output interface 17 with level shifting circuit 250 towards control device 13.
Zener diode 134,144, resistance 135,136,145,146, NPN transistor 137,147 become monolithic (transistor array).
Action to input interface circuit 11 describes below.
With terminal J, when K is connected, the operator operates dual-in- line switch 18,19 to the operator with the external equipment 150 of leakage type, selects leakage type input associative mode.FET drive circuit 210 disconnects the FET130 of VCC bypass circuit 220.When FET130 was disconnected, terminal J was connected with the power supply 132 of 24V by resistance 133.Simultaneously, FET drive circuit 210 is connected the FET140 of 6ND bypass circuit 230.When FET140 is connected, terminal K ground connection.
As shown in figure 10, terminal J as on leakage type input terminal after drawing work.Terminal K works as the terminal of supplying with GND.When the output of external equipment 150 disconnected, the current potential of terminal J kept 24V by resistance 133.The current potential of terminal K keeps GND (0V).With the current potential of terminal J are " L " level towards the output of control device 13 accordingly.With the current potential of terminal K are " H " level towards the output of control device 13 accordingly.
When the output of external equipment 150 is connected, terminal J, K short circuit.Electric current flows to GND from the power supply 132 of 24V by terminal J, K and FET140.The current potential of terminal J is changed to GND (0V) from 24V.Therefore, transistor 137 disconnects.Be changed to " H " level towards the output of control device 13 from " L " level accordingly with the current potential of terminal J.Terminal K keeps GND (0V).With the current potential of terminal K are " H " level towards the output of control device 13 accordingly.
With terminal J, when K is connected, the operator operates dual-in- line switch 18,19 to the operator with the external equipment 150 of source type, selects source type input associative mode.FET drive circuit 210 is connected the FET130 of VCC bypass circuit 220.When FET130 connected, terminal J was connected with the power supply of 24V.Simultaneously, FET drive circuit 210 disconnects the FET140 of GND bypass circuit 230.When FET140 disconnected, terminal K was by resistance 143 ground connection.
As shown in figure 10, terminal J works as the terminal of supplying with 24V power supply 132.Terminal K works as the source type input terminal after drop-down.When the output of external equipment 150 disconnected, the current potential of terminal J kept 24V.The current potential of terminal K keeps GND (0V) by resistance 143.With the current potential of terminal J are " L " level towards the output of control device 13 accordingly.With the current potential of terminal K are " H " level towards the output of control device 13 accordingly.
When the output of external equipment 150 is connected, terminal J, K short circuit.Electric current flows to terminal K from the power supply 132 of 24V by terminal J.The current potential of terminal K is changed to 24V from GND (0V).Therefore, transistor 147 is connected.When transistor 147 is connected, be changed to " L " level towards the output of control device 13 from " H " level accordingly with the current potential of terminal K.The current potential of terminal J keeps 24V.With the current potential of terminal J are " L " level towards the output of control device 13 accordingly.
With the terminal J of a plurality of input circuit portion 200, when H is connected, the operator operates dual-in- line switch 18,19 to the operator, selects leakage type/source type also to deposit the input associative mode with the external equipment 150 of the external equipment 150 of leakage type and source type.FET drive circuit 210 disconnects the FET130 of VCC bypass circuit 220.When FET130 disconnected, terminal J was connected with the power supply 132 of 24V by resistance 133.
Simultaneously, FET drive circuit 210 disconnects the FET140 of GND bypass circuit 230.When FET140 disconnected, terminal K was by resistance 143 ground connection.As shown in figure 10, terminal J as on leakage type input terminal after drawing work.Terminal K works as the source type input terminal after drop-down.Power by not shown 24V terminal and GND (0V) terminal.Action afterwards is the same during with above-mentioned situation.
Effect, effect to input interface circuit 11 described above describes below.
The operator operates dual-in- line switch 18,19, selects leakage type input associative mode or source type input associative mode.For leakage type input associative mode the time, control device 13 makes VCC bypass circuit 220 invalid, comes splicing ear J and power supply 132 by resistance 133.For leakage type input associative mode the time, control device 13 makes GND bypass circuit 230 effective, and terminal K is connected with ground connection.
The operator selects leakage type input associative mode or source type input associative mode according to the output signal type of external equipment 150 with dual-in-line switch 18,19.The operator can easily switch to input interface circuit 11 leakage type or source type.The operator needn't be in order to switch to leakage type or source type and is prepared multiple substrate.Therefore, input interface circuit 11 can be cut down manufacturing expense.Resistance 133 is located between terminal J and the power supply 132.Resistance 143 is located between terminal K and the ground connection.When external equipment 150 was connected with terminal J or terminal K, input interface circuit 11 prevented that reliably overcurrent from flowing through external equipment 150.
Dual-in- line switch 18,19 can be selected from the leakage type/source type of external equipment 150 input leakage type input signals and source type input signal and deposit the input associative mode.The operator operates dual-in- line switch 18,19 and when selecting leakage type/source type and depositing the input associative mode, control device 13 connects power supply 132 and terminal J by resistance 133, and by resistance 143 splicing ear K and ground connection.The external equipment 150 of leakage type and source type and when depositing, the operator can easily be connected external equipment 150 on terminal J and terminal K.
Switch element is replaced with FET130, at 140 o'clock from existing optical coupler, and the number of spare parts of input interface circuit 11 does not increase.FET130,140 more small-sized than optical coupler.Input interface circuit 11 can be cut down manufacturing expense.
The leakage type uses transistor array with level shifting circuit 240 and source type with level shifting circuit 250.Therefore, leakage type is littler than the circuit that uses optical coupler with level shifting circuit 250 with level shifting circuit 240 and source type.Input interface circuit 11 can not maximize.
When the operator selected leakage type input associative mode with dual-in- line switch 18,19, the leakage type was exported towards control device 13 after will being converted to low level from the input signal of terminal J with level shifting circuit 240.When the operator selected source type input associative mode with dual-in- line switch 18,19, the source type was exported towards control device 13 after will being converted to low level from the input signal of terminal K with level shifting circuit 250.Input interface circuit 11 is installed on a substrate 12 with level shifting circuit 240 and source type with level shifting circuit 250 with the leakage type.Input interface circuit 11 can switch between leakage type and source type with a substrate 12.
The leakage type comprises NPN transistor 137 and pull-up resistor 139 with level shifting circuit 240.NPN transistor 137 is moved according to the input signal from terminal J.Pull-up resistor 139 is connected between the collector electrode and power supply 138 of NPN transistor 137.Above-mentioned source type comprises NPN transistor 147 and pull-up resistor 149 with level shifting circuit 250.NPN transistor 147 is moved according to the input signal from terminal K.Pull-up resistor 149 is connected between the collector electrode and power supply 148 of NPN transistor 147.The leakage type uses the transistor more small-sized than optical coupler with level shifting circuit 240 and source type with level shifting circuit 250.The substrate 12 that input interface circuit 11 the is installed miniaturization that becomes.Input interface circuit 11 can be cut down manufacturing expense.
Below to partial alteration the variation of execution mode 2 describe.
1) number of input circuit portion 200 can change according to the output subnumber of external equipment 150.The number of input circuit portion 200 also can not be 32.The port of terminal board 60 also can be selected source type output associative mode, leakage type output associative mode, leakage type/source type and deposit the output associative mode by per 8 ports.The port of terminal board 60 also can be selected source type output associative mode, leakage type output associative mode, leakage type/source type and deposit the output associative mode by per 1 port.
2) input interface circuit 11 also can omit leakage type/source type and deposit the input associative mode.In this case, the dual-in-line switch also can be one.
3) leakage type is that the level conversion of input signal be 3.3V be the level of input signal with level shifting circuit 250 with 24V with level shifting circuit 240 and source type, but also can be with the level conversion of the signal of the external equipment structure for the level corresponding with the signal of control device 3.For example, leakage type also can be that the level conversion of input signal is the level of same degree with level shifting circuit 240 and source type with 3.3V with level shifting circuit 250.The leakage type also can be converted to 3.3V with the input signal of the level lower than 3.3V with level shifting circuit 240 and source type with level shifting circuit 250.
Accompanying drawing below with reference to the desirable execution mode 3 of expression describes the present invention in detail.
The structure of input/output interface circuit 300 is described according to Figure 11.
The input/output interface circuit 300 of being located at lathe numerical control device comprises output interface circuit 1 and input interface circuit 11.
The operator is set at dual-in-line switch 8 and connects and dual-in-line switch 9 is set at when disconnecting, and output interface circuit 1 becomes source type output associative mode.Dual-in-line switch 8 is set at disconnects and dual-in-line switch 9 is set at when connecting, output interface circuit 1 becomes leakage type output associative mode.Dual-in-line switch 8 is set at connects and dual-in-line switch 9 is set at when connecting, output interface circuit 1 becomes leakage type/source type and deposits the output associative mode.
The operator is set at dual-in-line switch 18 and connects and dual-in-line switch 19 is set at when disconnecting, and input interface circuit 11 becomes source type input associative mode.Dual-in-line switch 18 is set at disconnects and dual-in-line switch 19 is set at when connecting, input interface circuit 11 becomes leakage type input associative mode.Dual-in-line switch 18 is set at connects and dual-in-line switch 19 is set at when connecting, input interface circuit 11 becomes leakage type/source type and deposits the input associative mode.
The operator operates dual-in- line switch 8,9,18,19, the input and output type of signal easily can be switched to leakage type or source type.
The structure of output interface circuit 1 and input interface circuit 11 is the same with execution mode 1 and 2, omits its detailed description.
Claims (11)
1. interface circuit can switch between second output state of first output state of output source type signal and output leakage type signal, it is characterized in that, comprising:
The first terminal and second terminal, this first terminal is used for being connected with external equipment with second terminal;
First change-over circuit, this first change-over circuit is connected with described the first terminal;
Second change-over circuit, this second change-over circuit is connected with described second terminal;
Selector switch, this selector switch are selected described first output state or second output state; And
Control device, this control device is controlled the action of described first change-over circuit and second change-over circuit according to the selection of doing with described selector switch,
When selecting described first output state, described first change-over circuit is changed the source type output signal level of described control device,
When selecting described second output state, described second change-over circuit is changed the leakage type output signal level of described control device.
2. interface circuit as claimed in claim 1 is characterized in that,
Described selector switch can be selected the 3rd output state of output source type signal and leakage type signal,
When selecting described the 3rd output state, described first change-over circuit and second change-over circuit are changed the source type output signal and the leakage type output signal level of described control device.
3. interface circuit as claimed in claim 1 or 2 is characterized in that,
Described first change-over circuit comprises:
First switch element, this first switch element are located between the high power supply of described the first terminal and the described output signal level of level ratio; And
The first transistor, this first transistor moves according to described output signal, and controls the action of described first switch element,
Described second change-over circuit comprises:
Second switch element, this second switch element are located between described second terminal and the ground connection; And
Transistor seconds, this transistor seconds moves according to described output signal, and controls the action of described second switch element.
4. interface circuit as claimed in claim 3 is characterized in that,
When selecting described first output state with described selector switch, described control device is controlled to described second switch element all the time and connects,
When selecting described second output state with described selector switch, described control device is controlled to described first switch element all the time and connects.
5. interface circuit as claimed in claim 3 is characterized in that, described first switch element and second switch element are field-effect transistors.
6. interface circuit can and be used at first input state that is used to import type signal leakage switching between second input state of input source type signal, it is characterized in that, comprising:
The first terminal and second terminal, this first terminal is connected with external equipment with second terminal;
Selector switch, this selector switch are selected described first input state or second input state;
First resistance, this first resistance is located between described the first terminal and the power supply;
First bypass circuit, this first bypass circuit are arranged in parallel with described first resistance between described the first terminal and described power supply;
Second resistance, this second resistance are located between described second terminal and the ground connection;
Second bypass circuit, this second bypass circuit are arranged in parallel with described second resistance between described second terminal and described ground connection; And
Control device, this control device is controlled being connected of described the first terminal and described power supply and being connected of described second terminal and described ground connection according to the selection of doing with described selector switch,
When selecting described first input state, described control device connects described the first terminal and described power supply by described first resistance, and connects described second terminal and described ground connection by described second bypass circuit,
When selecting described second input state, described control device connects described the first terminal and described power supply by described first bypass circuit, and connects described second terminal and described ground connection by described second resistance.
7. interface circuit as claimed in claim 6 is characterized in that,
Described selector switch can be selected the 3rd input state, and the 3rd input state is used for from external equipment input leakage type signal and source type signal,
When selecting described the 3rd input state, described control device connects described the first terminal and described power supply by described first resistance, and connects described second terminal and described ground connection by described second resistance.
8. as claim 6 or 7 described interface circuits, it is characterized in that,
Described first bypass circuit comprises first switch element,
Described second bypass circuit comprises the second switch element,
When selecting described first input state, described control device disconnects described first switch element and connects described second switch element,
When selecting described second input state, described control device is connected described first switch element and is disconnected described second switch element.
9. interface circuit as claimed in claim 8 is characterized in that, described first switch element and second switch element are field-effect transistors.
10. as claim 6 or 7 described interface circuits, it is characterized in that, comprising:
First change-over circuit, this first change-over circuit conversion is from the level of the leakage type input signal of described the first terminal; And
Second change-over circuit, this second change-over circuit conversion is from the level of the source type input signal of described second terminal.
11. interface circuit as claimed in claim 10 is characterized in that,
Described first change-over circuit comprises:
The first transistor, this first transistor moves according to the input signal from described the first terminal; And
First pull-up resistor, this first pull-up resistor is connected with the collector electrode of described the first transistor,
Described second change-over circuit comprises:
Transistor seconds, this transistor seconds moves according to the input signal from described second terminal; And
Second pull-up resistor, this second pull-up resistor is connected with the collector electrode of described transistor seconds.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-082222 | 2009-03-30 | ||
| JP2009082221A JP4862912B2 (en) | 2009-03-30 | 2009-03-30 | Output interface circuit |
| JP2009-082221 | 2009-03-30 | ||
| JP2009082222A JP4807431B2 (en) | 2009-03-30 | 2009-03-30 | Input interface circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101854112A true CN101854112A (en) | 2010-10-06 |
| CN101854112B CN101854112B (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010144272 Active CN101854112B (en) | 2009-03-30 | 2010-03-15 | Interface circuit |
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| CN (1) | CN101854112B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896775A (en) * | 2015-12-21 | 2017-06-27 | 施耐德电气工业公司 | For the output circuit of programmable logic controller (PLC) |
| CN109445424A (en) * | 2018-12-25 | 2019-03-08 | 珠海格力电器股份有限公司 | Detection circuit and detection device |
| CN112596462A (en) * | 2020-12-22 | 2021-04-02 | 深圳市英威腾电气股份有限公司 | Output method, device and system based on signal type |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06119280A (en) * | 1992-10-06 | 1994-04-28 | Nec Eng Ltd | Data processor |
| JP2004072434A (en) * | 2002-08-06 | 2004-03-04 | Sony Corp | Data output circuit and integrated circuit having the same |
| JP2005051317A (en) * | 2003-07-29 | 2005-02-24 | Sunx Ltd | Signal output circuit, detection switch, and multiple optical axis photoelectric switch |
| JP3700315B2 (en) * | 1997-03-11 | 2005-09-28 | 三菱電機株式会社 | Control board |
-
2010
- 2010-03-15 CN CN 201010144272 patent/CN101854112B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06119280A (en) * | 1992-10-06 | 1994-04-28 | Nec Eng Ltd | Data processor |
| JP3700315B2 (en) * | 1997-03-11 | 2005-09-28 | 三菱電機株式会社 | Control board |
| JP2004072434A (en) * | 2002-08-06 | 2004-03-04 | Sony Corp | Data output circuit and integrated circuit having the same |
| JP2005051317A (en) * | 2003-07-29 | 2005-02-24 | Sunx Ltd | Signal output circuit, detection switch, and multiple optical axis photoelectric switch |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896775A (en) * | 2015-12-21 | 2017-06-27 | 施耐德电气工业公司 | For the output circuit of programmable logic controller (PLC) |
| CN109445424A (en) * | 2018-12-25 | 2019-03-08 | 珠海格力电器股份有限公司 | Detection circuit and detection device |
| CN109445424B (en) * | 2018-12-25 | 2024-06-11 | 珠海格力电器股份有限公司 | Detection circuit and detection device |
| CN112596462A (en) * | 2020-12-22 | 2021-04-02 | 深圳市英威腾电气股份有限公司 | Output method, device and system based on signal type |
| CN112596462B (en) * | 2020-12-22 | 2022-04-22 | 深圳市英威腾电气股份有限公司 | Output method, device and system based on signal type |
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| CN101854112B (en) | 2013-01-30 |
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