Relay module with portable PNP and NPN mode switching function

Abstract

The utility model provides a portable relay module with a PNP and NPN mode switching function, a state switching assembly and a load control assembly, the state switching assembly comprises a dial switch, the dial switch comprises a movable contact C and at least two fixed contacts, the first fixed contact is connected with power supply voltage, and the second fixed contact N is grounded. The load control assembly comprises a plurality of relays and control signal input ports in one-to-one correspondence with the relays, the first end of a coil of each relay is connected with a movable contact C of the dial switch, and the second end of the coil of each relay is connected with the control signal input ports. In an NPN mode, the dial switch is toggled until the movable contact is connected with the first fixed contact; and in the PNP mode, the dial switch is dialed until the movable contact is connected with the second fixed contact. The switching between the NPN mode and the PNP mode of the relay module is realized through the dial switch, which is very convenient and does not need to remove wires.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, and in particular to a convenient relay module with a PNP and NPN mode switching function. Background Art

[0002] In the field of industrial automation and electrical control, relay modules are a common control element and are widely used in the external control of various devices. According to different equipment requirements and control system designs, the connection method between relay modules and external devices is also different. Among them, NPN control mode and PNP control mode are two common external control modes.

[0003] NPN control mode usually means that the control signal is effective at low level, that is, when the control signal is at low level, the relay module is activated. PNP control mode means that the control signal is effective at high level, that is, when the control signal is at high level, the relay module is activated.

[0004] However, when switching between NPN and PNP control modes, existing relay modules usually require manual replacement of connection lines, which not only increases the difficulty and complexity of operation, but also reduces work efficiency. In addition, when the relay module is not in use, in order to avoid energy consumption and potential safety risks, it is necessary to manually disconnect the power supply or remove the wires, which undoubtedly increases the workload of maintenance and management. Utility Model Content

[0005] In order to solve the above problems, the purpose of the utility model is to provide a convenient relay module with PNP and NPN mode switching function, which can conveniently switch between NPN and PNP modes through a three-state dip switch. When neither working state is needed, the dip switch can be turned to a completely disconnected state, eliminating the steps of shutting off the power supply or removing the wires.

[0006] The utility model is realized by the following technical solutions:

[0007] A convenient relay module with PNP and NPN mode switching function, comprising:

[0008] A state switching component, the state switching component includes a dip switch, the dip switch includes at least two fixed contacts, a first fixed contact is connected to a power supply voltage, and a second fixed contact is grounded;

[0009] A load control component, the load control component includes a plurality of relays and control signal input ports corresponding to the relays one by one, the first end of the coil of each relay is connected to the movable contact of the dip switch, and the second end is connected to the control signal input port.

[0010] Furthermore, the DIP switch further includes a third fixed contact, and the third fixed contact is suspended.

[0011] Furthermore, the state switching component also includes a first state indicator, and two ends of the first state indicator are respectively connected to the first fixed contact and the movable contact.

[0012] Further, the first state indicator comprises a first light emitting diode, and an anode of the first light emitting diode is connected to the first fixed contact.

[0013] Furthermore, the state switching component also includes a second state indicator, and two ends of the second state indicator are respectively connected to the second fixed contact and the movable contact.

[0014] Furthermore, the second state indicator comprises a second light emitting diode, and an anode of the second light emitting diode is connected to the movable contact.

[0015] Furthermore, the load control component also includes a working indicator, and the working indicator is connected in series between the second end of the coil of the relay and the control signal input port.

[0016] Furthermore, the work indicator comprises two light emitting diodes connected in parallel, and the two light emitting diodes are arranged in opposite directions.

[0017] Furthermore, a protective resistor is connected in series between the work indicator and the second end of the coil.

[0018] Compared with the prior art, the technical solution of the utility model and its beneficial effects are as follows:

[0019] (1) When the relay module of the utility model needs to be adjusted to low-level control, the circuit can be turned on by turning the dip switch to connect the movable contact with the first fixed contact. When the relay module needs to be adjusted to high-level control, the dip switch can be turned to connect the movable contact with the second fixed contact. The dip switch can be used to switch the relay module between NPN mode and PNP mode, which is very convenient and does not require disconnection.

[0020] (2) The DIP switch of the utility model is a three-state DIP switch, which can switch between NPN mode and PNP mode. There is also a third state in which the active contact is suspended so that the circuit is completely disconnected, thereby stopping the relay from working, thereby improving the previous cumbersome steps of turning off the power supply or removing the wires.

[0021] (3) The state switching assembly of the present invention is also provided with a first state indicator and a second state indicator, which intuitively indicate the current working mode of the relay module and have a simple structure.

[0022] (4) The utility model provides a working indicator on each relay circuit, so that the user can clearly see which relays are in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a circuit schematic diagram of a convenient relay module with PNP and NPN mode switching function provided by an embodiment of the utility model;

[0024] Figure 2 This is a current flow state diagram in the NPN mode provided by an embodiment of the utility model;

[0025] Figure 3 It is a current flow state diagram in the PNP mode provided by an embodiment of the utility model;

[0026] Figure 4 This is a state diagram of the DIP switch provided by the embodiment of the utility model being in the third state and the circuit being disconnected.

[0027] Illustration Description:

[0028] State switching component-100; DIP switch-110; first state indicator-120; second state indicator-130;

[0029] Load control component-200; relay-210; control signal input port-220, working indicator-230. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] See also Figure 1A convenient relay module with PNP and NPN mode switching function includes a state switching component 100 and a load control component 200. The state switching component 100 includes a dip switch 110. The dip switch 110 includes a movable contact C and at least two fixed contacts. The first fixed contact P is connected to a 24V power supply voltage, and the second fixed contact N is grounded. That is, when the movable contact C is connected to the first fixed contact P, the movable contact C is at a high potential, and when the movable contact C is connected to the second fixed contact N, the movable contact C is at a low potential. The load control component 200 includes a plurality of relays 210 and control signal input ports 220 corresponding to the relays 210. The first end of the coil of each relay 210 is connected to the movable contact C of the dip switch 110, and the second end is connected to the control signal input port 220.

[0032] See also Figure 2 When the control signal input port 220 is a low level control to open the relay, that is, in NPN mode, the dip switch 110 is turned to connect the active contact C to the first fixed contact N, and the current is conducted from the 24V power supply voltage to the first end of the relay (see mark A in the figure) through the NC connection. The current flows from the first end of the high potential relay 210 coil to the low potential control signal input port 220, forming a loop. The current flows through the relay coil, generating a magnetic field to attract the armature of the execution part to close or open, and then the controller relay is turned on or off.

[0033] See also Figure 3 When the control signal input port 220 is at a high level to control the relay to be turned on, that is, in PNP mode, the dip switch 110 is turned to connect the active contact C to the second fixed contact P. The current flows from the high-potential control signal input port 220 through the relay coil to the state switching component 100, and is conducted to the ground through PC to form a loop. The current flows through the relay coil, generating a magnetic field to attract the armature of the execution part to close or open, thereby controlling the opening or closing of the controller relay.

[0034] The relay module can be switched between NPN mode and PNP mode by using the DIP switch, which is very convenient and does not require disconnection. Figure 4 In this embodiment, the dip switch 110 also includes a third fixed contact, and the third fixed contact is suspended. When the dip switch 110 is moved to the point where the active contact is connected to the third fixed contact, the circuit is disconnected, so that no current flows through the relay coil, and the relay module does not work. That is, when the relay module does not need any working state, the circuit can be completely disconnected by simply turning the dip switch 110 to the third fixed contact, which improves the previous cumbersome steps of turning off the power supply or removing the wires. It can be understood that the third fixed contact can be a real contact or a virtual contact, referring to the third state of the dip switch that is different from the PC or NC connection.

[0035] Continue reading Figure 1 The state switching component further includes a first state indicator 120, the two ends of which are respectively connected to the first fixed contact N and the movable contact C, for indicating that the relay module is currently in the PNP mode. The state switching component further includes a second state indicator 130, the two ends of which are respectively connected to the second fixed contact and the movable contact, for indicating that the relay module is currently in the NPN mode.

[0036] In NPN mode, the current flows from the 24V power supply voltage through the NC conduction to the second state indicator 130, and then returns to the ground to form a loop. The current flows through the second state indicator 130, thereby activating the second state indicator 130, while the first state indicator 120 is short-circuited due to the NC conduction, and is in an unactivated state. Figure 3 .

[0037] In the PNP mode, the current flows from the 24V power supply voltage through the first state indicator 120, and then returns to the ground from the PC to form a loop. The current flows through the first state indicator 120, thereby activating the first state indicator 120, while the second state indicator 130 is short-circuited because the PC is turned on, and is in an unactivated state. Figure 2 .

[0038] Specifically, the first state indicator 120 includes a first light emitting diode D1, and the anode of the first light emitting diode D1 is connected to the first fixed contact N. The second state indicator 130 includes a second light emitting diode D2, and the anode of the second light emitting diode D2 is connected to the movable contact C. In this embodiment, the first state indicator also includes a resistor R1 connected in series with the first light emitting diode, and the second state indicator also includes a resistor R2 connected in series with the second light emitting diode, so as to perform current limiting protection on the light emitting diode.

[0039] Continue reading Figure 1 The load control assembly 200 further includes a working indicator 230, which is connected in series between the second end of the coil of the relay 210 and the control signal input port 220. Specifically, the working indicator includes two light-emitting diodes connected in parallel, and the two light-emitting diodes are set in reverse, so that no matter in the PNP mode or the NPN mode, one light-emitting diode will be turned on, thereby indicating that the relay is in a working state. In this embodiment, a protective resistor is also connected in series between the working indicator 230 and the second end of the coil, and the working indicator 230 and the protective resistor correspond to the relay 210 one by one.

[0040] The above description shows and describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept of this article through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A convenient relay module with PNP and NPN mode switching function, characterized in that: include: A state switching component, the state switching component comprises a dip switch, the dip switch comprises at least two fixed contacts, a first fixed contact is connected to a power supply voltage, and a second fixed contact is grounded; A load control component, the load control component includes a plurality of relays and control signal input ports corresponding to the relays one by one, the first end of the coil of each relay is connected to the movable contact of the dip switch, and the second end is connected to the control signal input port.

2. A portable relay module with PNP and NPN mode switching function according to claim 1, characterized in that: The dip switch further includes a third fixed contact, and the third fixed contact is suspended.

3. A portable relay module with PNP and NPN mode switching function according to claim 1, characterized in that: The state switching component also includes a first state indicator, and two ends of the first state indicator are respectively connected to the first fixed contact and the movable contact.

4. A portable relay module with PNP and NPN mode switching function according to claim 3, characterized in that: The first state indicator comprises a first light emitting diode, an anode of which is connected to the first fixed contact.

5. A portable relay module with PNP and NPN mode switching function according to claim 1, characterized in that: The state switching component also includes a second state indicator, and two ends of the second state indicator are respectively connected to the second fixed contact and the movable contact.

6. A portable relay module with PNP and NPN mode switching function according to claim 5, characterized in that: The second state indicator comprises a second light emitting diode, and an anode of the second light emitting diode is connected to the movable contact.

7. A portable relay module with PNP and NPN mode switching function according to claim 1, characterized in that: The load control assembly further comprises a working indicator, and the working indicator is connected in series between the second end of the coil of the relay and the control signal input port.

8. A portable relay module with PNP and NPN mode switching function according to claim 7, characterized in that: The work indicator comprises two light emitting diodes connected in parallel, and the two light emitting diodes are arranged in opposite directions.

9. A portable relay module with PNP and NPN mode switching function according to claim 7, characterized in that: A protective resistor is also connected in series between the work indicator and the second end of the coil.

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