Pulse wheel unit system based on EtherCAT bus communication

Abstract

The invention discloses a pulse wheel unit system based on EtherCAT bus communication. The pulse wheel unit system comprises a signal conversion box and an aviation plug type pulse wheel unit. The signal conversion box comprises a shell, a main control board is arranged in the shell, the back face of the main control board is connected with an input and output expansion board through a row pin in an inserted mode, the main control board and the input and output expansion board form a whole, the front face of the shell is provided with an aviation socket, the top of the shell is provided with a power socket, an EtherCAT interface, a pulse unit interface and an IO expansion port, and the EtherCAT interface is externally connected to an EtherCAT master station on the controller to achieve bus communication. The pulse unit interface is connected to the pulse wheel unit. Compared with the traditional scheme, the EtherCAT bus control system has the advantages of abundant interfaces, powerful control function, low cost and the like, is high in integration level, and is an EtherCAT bus control product with the most complete modular functions at present.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control, and in particular to a pulse wheel unit system based on EtherCAT bus communication. Background Art

[0002] The pulse wheel unit is mainly used to accurately control the position and speed of equipment, such as CNC machine tools, robots and automated production lines. It is a human-machine interactive device that sends instructions by turning the hand wheel to control the movement of the equipment.

[0003] The principle of the pulse wheel unit is mainly based on the working principle of the knob switch and encoder. The knob switch is a common electronic component that changes the switch position by rotating or sliding the contact, thereby changing the open and closed state of the switch in the circuit. At different switch positions, the equivalent is converted into different control axis and magnification signals and transmitted to the control system.

[0004] An encoder is a device that can convert rotational or linear displacement into a pulse level signal. The encoder usually contains a photoelectric conversion element and a dial. When the handwheel rotates, the encoder will generate corresponding high and low level signals according to the movement of the dial. These signals can be converted into numerical signals by the encoder module and accurately recognized by the control system and converted into displacement or speed instructions for the device.

[0005] After receiving the digital signal or pulse value signal sent by the pulse wheel unit, the control system will perform corresponding processing, such as calculating the displacement, judging the rotation direction, etc., and control the movement of the equipment according to these calculation results. Through the pulse wheel unit, the operator can intuitively control the movement of the equipment and achieve precise positioning and speed adjustment.

[0006] For CNC systems based on soft PLC, such as Beckhoff's TWINCAT and 3S's CODESYS platform, the passive switch on / off signals generated by the pulse wheel unit and the high and low level pulse signals of the encoder cannot be read by the ETHERCAT bus. A digital quantity module (such as Beckhoff's EL1809 and EL2809 modules) is required to convert the axis selection and ratio switch on / off into binary 0 and 1 quantity signals. The encoder's high and low level pulse signals are converted into numerical value changes through an encoder module (such as Beckhoff's EL5101 module) and transmitted to the CNC system.

[0007] The final result is that the commonly used pulse wheel unit needs to be equipped with a corresponding remote IO module to transmit the signal of the pulse wheel unit to the CNC system, which leads to troublesome wiring and high costs. Summary of the invention

[0008] The object of the present invention is to provide a pulse wheel unit system based on EtherCAT bus communication in view of the defects and shortcomings of the prior art.

[0009] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a pulse wheel unit system based on EtherCAT bus communication, the innovation of which is: comprising a signal conversion box and an aviation plug type pulse wheel unit; the signal conversion box comprises a shell, the shell has a built-in main control board, the back of the main control board is connected to the input and output expansion board through a row of pins, and the two are integrated, the front of the shell is provided with an aviation socket, the top of the shell is respectively provided with a power socket, an EtherCAT interface, a pulse unit interface and an IO expansion port, the EtherCAT interface is externally connected to the EtherCAT on the controller The bus communication is realized on the T master station, and the pulse unit interface is connected to the pulse wheel unit; the pulse wheel unit includes an upper shell and a lower shell, and the front of the upper shell is respectively provided with an axis selection switch, a feed button and a pulse wheel, an emergency stop switch is arranged on the top of the upper shell, and an enable button is arranged on the side thereof, and a signal line is arranged through the bottom of the lower shell, one end of the signal line is connected with the pulse unit interface, and the other end thereof passes through the wire hole of the lower shell and is welded to the emergency stop switch and the enable button, and then is inserted into the PH2.0 terminal socket of the internal circuit board, so as to connect all signals in the pulse wheel unit to the signal line.

[0010] Furthermore, the main control board is mainly composed of power input EMC and protection circuit, EtherCAT bus circuit, MCU logic processing circuit and IO input and output circuit, and the components involved are completed by wave soldering and patch technology.

[0011] Furthermore, the IO expansion port is connected to the emergency stop switch and the enable button on the pulse wheel unit, and is externally connected to the remote module through hard wiring.

[0012] Furthermore, the aviation socket is externally connected to a pulse wheel unit with a 35P aviation interface and converts the switch signal and pulse signal on the pulse wheel unit into digital quantity and pulse value and transmits them to the PLC program of the controller through the EtherCAT bus for use.

[0013] Furthermore, the feed button is attached to the circuit board using a mask and is attached to the upper shell using double-sided tape.

[0014] After adopting the above structure, the beneficial effects of the present invention are:

[0015] Compared with the traditional scheme, the present invention has the advantages of rich interfaces, powerful control functions, low cost, etc. In addition, the present invention has high integration and is the EtherCAT bus control product with the most complete modular functions. The present invention integrates the required remote IO module into the aviation plug or pulse unit interface of the pulse wheel unit through the bus control board; converts the original signal of the standard pulse wheel unit into a signal that can be read by the soft PLC platform, and the wiring is convenient, practical and flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the signal conversion box in the present invention;

[0017] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0018] Figure 3 A top view of the signal conversion box of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the main control board in the present invention;

[0020] Figure 5 It is a front view of the pulse wheel unit in the present invention;

[0021] Figure 6 It is a flow chart of the program of the present invention.

[0022] Description of reference numerals:

[0023] 1 signal conversion box, 11 shell, 12 main control board, 121 power input EMC and protection circuit, 122-EtherCAT bus circuit, 123-MCU logic processing circuit, 124-IO input and output circuit, 13 input and output expansion board, 14 aviation socket, 15 power socket, 16-EtherCAT interface, 17 pulse unit interface, 18-IO expansion port, 2 signal transfer box, 21 upper shell, 22 lower shell, 23

[0024] Axis selection switch, 24 feed button, 25 pulse wheel, 26 emergency stop switch, 27 enable button, 28 signal line, 29 mask. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] See also Figure 1-6A pulse wheel unit system based on EtherCAT bus communication includes a signal conversion box 1 and an aviation plug type pulse wheel unit 2; the signal conversion box 1 includes a shell 11, the shell 11 has a built-in main control board 12, the back of the main control board 12 is connected to the input and output expansion board 13 through a row of pins, and the two are integrated, the front of the shell 11 is provided with an aviation socket 14, the top of the shell 11 is respectively provided with a power socket 15, an EtherCAT interface 16, a pulse unit interface 17 and an IO expansion port 18, the EtherCAT interface 16 is externally connected to the EtherCAT master station on the controller to realize bus communication, and the pulse unit The interface 17 is connected to the pulse wheel unit; the pulse wheel unit 2 includes an upper shell 21 and a lower shell 22, and an axis selection switch 23, a feed button 24 and a pulse wheel 25 are respectively arranged on the front of the upper shell 21, an emergency stop switch 26 is arranged on the top of the upper shell 21, and an enable button 27 is arranged on the side thereof, and a signal line 28 is arranged through the bottom of the lower shell 22, one end of the signal line 28 is connected to the pulse unit interface 17, and the other end thereof passes through the wire hole of the lower shell and is welded to the emergency stop switch 26 and the enable button 27, and then is inserted into the PH2.0 terminal socket of the internal circuit board to connect all signals in the pulse wheel unit to the signal line.Specifically, the main control board 12 is the core control component of this product. The main control board mainly uses LAN9253-SVB QFN64 as the EtherCAT slave protocol chip and MCU STM32H750VBT6 as the embedded logic control chip. It can control the signal feedback cycle within 1ms under the condition that all IO points are started. It is based on MCU The design is based on STM32H750VBT6, and C language is used as the basic language of embedded programs; LAN9253-SVBQFN64 is the EtherCAT slave protocol chip; EtherCAT signal conversion box, with EtherCAT main control board 12 as the core component, EtherCAT main control board 12 and input and output expansion board 13 are combined through pins and fixed in the shell 11 with 4 screws; EtherCAT interface 16 is exposed on the shell, this interface can be connected to the EtherCAT master station on the controller to realize bus communication; DB26 pulse wheel unit interface 17, this interface can connect the pulse wheel unit of DB26 interface and convert the switch signal and pulse signal on the pulse wheel unit into digital quantity and pulse value and transmit it to the controller's PLC program through EtherCAT bus; IO expansion port 18, this interface is connected to the emergency stop switch and enable button on the pulse wheel unit, and is connected to the remote module through hard wiring; Empty socket 14, this interface can connect the pulse wheel unit of 35P aviation interface and convert the switch signal and pulse signal on the pulse wheel unit into digital quantity and pulse value and transmit it to the PLC program of the controller through EtherCAT bus for use; the pulse wheel unit 2 is matched with the EtherCAT signal conversion box 1, and general users need to use it as a set. The assembly process of this pulse wheel unit is as follows: stick the mask 29 with the feed button 24 on the circuit board and stick it on the upper shell 21 with double-sided tape; then install the axis selection switch 23; also install the pulse wheel 25 on the upper shell; pass the signal line 28 through the wire hole of the lower shell and weld the signal line to the emergency stop switch and the enable button, and then insert it into the PH2.0 seat of the internal circuit board; so as to connect all the signals in the pulse wheel unit to the signal line; the pulse wheel unit contains the XML configuration file of EtherCAT and the embedded program of MCU; the embedded program is burned into the chip during production, and the XML file is provided to the customer for PLC configuration.

[0028] See also Figure 4 The main control board 12 is mainly composed of a power input EMC and protection circuit 121, an EtherCAT bus circuit 122, an MCU logic processing circuit 123 and an IO input and output circuit 124. The components involved are completed by wave soldering and patch processing.

[0029] In this embodiment, the IO expansion port 18 is connected to the emergency stop switch 26 and the enable button 27 on the pulse wheel unit 2, and is externally connected to the remote module through hard wiring, so that remote monitoring can be performed.

[0030] In this embodiment, the aviation socket 14 is connected to a pulse wheel unit with an external 35P aviation interface and converts the switch signal and pulse signal on the pulse wheel unit into digital quantity and pulse value and transmits them to the PLC program of the controller through the EtherCAT bus for use.

[0031] In this embodiment, the feed button 24 is attached to the circuit board using a mask 29 and is attached to the upper shell using double-sided tape, which is convenient and quick to install.

[0032] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A pulse wheel unit system based on EtherCAT bus communication, characterized in that: Including signal conversion box and aviation plug type pulse wheel unit; The signal conversion box includes a shell, the shell has a built-in main control board, the back of the main control board is connected to the input and output expansion board through a row of pins, and the two are integrated. An aviation socket is arranged on the front of the shell, and a power socket, an EtherCAT interface, a pulse unit interface and an IO expansion port are arranged on the top of the shell respectively. The EtherCAT interface is connected to the EtherCAT master station on the controller to realize bus communication, and the pulse unit interface is connected to the pulse wheel unit; the pulse wheel unit includes an upper shell and a lower shell, and an axis selection switch, a feed button and a pulse wheel are arranged on the front of the upper shell respectively, an emergency stop switch is arranged on the top of the upper shell, and an enable button is arranged on the side thereof, and a signal line is arranged through the bottom of the lower shell, one end of the signal line is connected to the pulse unit interface, and the other end thereof passes through the wire hole of the lower shell and is welded to the emergency stop switch and the enable button, and then is inserted into the PH2.0 wiring seat of the internal circuit board to achieve the connection of all signals in the pulse wheel unit to the signal line.

2. The pulse wheel unit system based on EtherCAT bus communication according to claim 1, characterized in that: The main control board is mainly composed of power input EMC and protection circuit, EtherCAT bus circuit, MCU logic processing circuit and IO input and output circuit, and the components involved are completed by wave soldering and patch technology.

3. The pulse wheel unit system based on EtherCAT bus communication according to claim 1, characterized in that: The IO expansion port is connected to the emergency stop switch and the enable button on the pulse wheel unit, and is externally connected to the remote module through hard wiring.

4. The pulse wheel unit system based on EtherCAT bus communication according to claim 1, characterized in that: The aviation socket is externally connected to a pulse wheel unit with a 35P aviation interface and converts the switch signal and the pulse signal on the pulse wheel unit into digital quantities and pulse values ​​and transmits them to the PLC program of the controller through the EtherCAT bus for use.

5. The pulse wheel unit system based on EtherCAT bus communication according to claim 1, characterized in that: The feed button is attached to the circuit board using a mask and is attached to the upper shell using a double-sided adhesive.

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