CN111487895A - Communication system of displacement sensor and controller - Google Patents
Communication system of displacement sensor and controller Download PDFInfo
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- CN111487895A CN111487895A CN201910085123.2A CN201910085123A CN111487895A CN 111487895 A CN111487895 A CN 111487895A CN 201910085123 A CN201910085123 A CN 201910085123A CN 111487895 A CN111487895 A CN 111487895A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1136—Canbus
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21014—Interface, module with relays
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21063—Bus, I-O connected to a bus
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25032—CAN, canbus, controller area network bus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a communication system of a displacement sensor and a controller, which solves the problem that the conventional CANbus module cannot drag a plurality of displacement sensors and has the technical scheme that a magnetic scale conversion card is arranged between the controller and the displacement sensor, and a first CANbus port is in communication connection with a second CANbus port; the magnetic scale conversion card can measure real-time displacement data of a plurality of displacement sensors and pack the data to form a data packet; the controller actively reads a data packet through a CANbus and decompresses the data packet to acquire measurement data of each displacement sensor.
Description
Technical Field
The invention relates to a control system of an injection molding machine, in particular to a communication system of a displacement sensor and a controller.
Background
The electronic ruler (also called linear displacement sensor and resistance ruler) is suitable for the occasions needing accurate displacement measurement, such as injection molding machines, woodworking machines, printing machines, spraying machines, robots, engineering monitoring computer control sports apparatuses and the like.
In the existing injection molding machine equipment, the solution of electronic ruler position feedback is greatly limited, and often has a lot of complex electromagnetic interference from high frequency and low frequency, and the absolute voltage signal inevitably causes serious interference, so that the measurement accuracy of the electronic ruler is difficult to ensure; when the injection molding machine is provided with a plurality of electronic rulers, the probability of interference of the electronic rulers is greatly increased; on the other hand, the resolution of the long-stroke electronic ruler is very low, which greatly affects the precision and stability.
In order to solve the problems, a digital displacement sensor (also called a digital ruler) exists in the market at present, the accuracy is high, the anti-interference capability is strong, but the cost is high, and besides the price of the digital ruler, a CANbus module for communicating the digital ruler with a controller is also needed to be configured; at present, the module can only carry 2 digital rulers at most, but a plurality of digital rulers are usually required to be installed in an injection molding machine, so a plurality of CANbus modules are required to be configured, and the installation cost is greatly increased.
Disclosure of Invention
The invention aims to provide a communication system of a displacement sensor and a controller, which can realize that a single CANbus module drags a plurality of displacement sensors so as to reduce the installation cost of the sensors.
The technical purpose of the invention is realized by the following technical scheme:
a communication system of a displacement sensor and a controller comprises the controller and a plurality of displacement sensors, wherein a magnetic scale conversion card is arranged between the controller and the displacement sensors, the magnetic scale conversion card comprises a plurality of input channels and a first CANbus port, the controller comprises a second CANbus port, the plurality of input channels are used for the sequential coupling of the plurality of displacement sensors, and the first CANbus port is in communication connection with the second CANbus port; the magnetic scale conversion card can measure real-time displacement data of a plurality of displacement sensors and pack the data to form a data packet; the controller actively reads the data packet through the CANbus and decompresses the data packet to acquire the measurement data of each displacement sensor.
Preferably, the displacement sensor is a start/stop digital ruler.
Preferably, the controller completes the PDO protocol and the STO protocol corresponding to the magnetic scale conversion card through control program configuration, and writes a gradient value corresponding to the displacement sensor; after the data packet information in the magnetic scale conversion card is transmitted to the controller, the controller program performs corresponding operation according to the PDO protocol and the STO protocol to calculate the actual measurement data of each displacement sensor.
Preferably, the output end of the controller is further coupled with a display module, and the controller transmits the calculated measurement data to the display module for display.
In conclusion, the invention has the following beneficial effects:
1. the plurality of displacement sensors on the injection molding machine are respectively connected to the plurality of input channels of the magnetic scale conversion card, and the magnetic scale conversion card is connected to a CANbus port of the controller through a CANbus port, so that the controller can realize communication with the plurality of displacement sensors through a single CANbus port, and the cost for configuring the CANbus module is reduced;
2. the start/stop digital ruler is the most economic digital signal output magnetostrictive digital ruler which can achieve high noise immunity at present;
3. the display module can show the measured data calculated by the controller, and is more humanized.
Drawings
Fig. 1 is a system architecture diagram of the present embodiment.
In the figure: 1. a controller; 2. a displacement sensor; 3. magnetic scale conversion card.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The communication system of the displacement sensor and the controller disclosed in this embodiment includes, as shown in fig. 1, a controller 1 and a plurality of displacement sensors 2, where the controller 1 is a chip with data processing capability, including but not limited to a single chip microcomputer, a P L C, a CPU, an MCU, an ARM, etc., the displacement sensor 2 is a start/stop digital ruler, a magnetic ruler conversion card 3 is disposed between the controller 1 and the displacement sensor 2, the magnetic ruler conversion card 3 includes a plurality of input channels and a first CANbus port, the plurality of input channels are sequentially coupled to the plurality of displacement sensors 2, and the number of the input channels is preferably eight, so that a single magnetic ruler conversion card 3 can be connected to eight displacement sensors 2 at most, that is, each displacement sensor 2 corresponds to one input channel, the controller 1 includes a second nbcau bus port, and the first CANbus port is in communication connection with the second CANbus port, so that the controller 1 can realize communication with the eight displacement sensors 2 through the single canus bus port.
In this embodiment, the magnetic scale conversion card 3 can measure real-time displacement data of the plurality of displacement sensors 2 and package the data to form a data packet; the controller 1 actively reads the data packet via the CANbus and decompresses the data packet to obtain the measurement data of each displacement sensor 2. More specifically, a control chip and a memory are integrated in the magnetic scale conversion card 3, a plurality of input channels are coupled to an input end of the control chip, and the memory is coupled between an output end of the control chip and the first CANbus port. The control chip comprises but is not limited to a singlechip, a CPU, an MCU, an ARM and the like; memory includes, but is not limited to, RAM, FIFO, etc. The displacement sensors 2 send the measured displacement data to the control chip in a signal form, and the control chip performs operation processing and packaging on the collected displacement data of the plurality of displacement sensors 2 and then caches the data in the memory. When the injection molding machine controller 1 applies for inquiring the position information of each position on the injection molding machine, the memory CAN provide a data packet to the controller 1 through the CAN protocol to feed back the position information measured by each displacement sensor 2.
More specifically, a start/stop digital ruler, also called a magnetostrictive displacement sensor, is made using the magnetostrictive property of an inductive element (waveguide). The magnetostrictive displacement sensor accurately detects the absolute position of the movable magnetic ring through the internal non-contact measurement and control technology to measure the actual displacement value of the detected product; the high accuracy and reliability of the sensor has been widely used in thousands of practical cases. Because the movable magnetic ring used for determining the position is not in direct contact with the sensitive element, the sensor can be applied to extremely severe industrial environment and is not easily affected by oil stains, solutions, dust or other pollution. In addition, the sensor uses high-tech materials and advanced electronic processing technology, so that it can be applied in high-temperature, high-pressure and high-oscillation environments. The output signal of the sensor is an absolute displacement value, so that data cannot be lost even if the power supply is interrupted and reconnected, and the data does not need to be re-zeroed. Because the sensitive element is non-contact, even if the detection is repeated, the sensor is not abraded, and the reliability of the detection can be greatly improved and the service life can be greatly prolonged.
The specific working principle is as follows:
the magnetostrictive displacement sensor accurately measures the position by utilizing the magnetostrictive principle and generating a strain pulse signal through the intersection of two different magnetic fields. The measuring element is a waveguide tube, and a sensitive element in the waveguide tube is made of special magnetostrictive materials. The measurement process is the generation of a current pulse within the electronic chamber of the sensor, which for convenience of description is defined as a "START pulse". The current pulse is transmitted in the wave guide tube, so that a circumferential magnetic field is generated outside the wave guide tube, when the magnetic field is intersected with a magnetic field generated by a movable magnetic ring sleeved on the wave guide tube and used as a position change, a strain mechanical wave pulse signal is generated in the wave guide tube under the action of magnetostriction, the strain mechanical wave pulse signal is transmitted at a fixed sound speed and is detected by an electronic chamber quickly, and for the convenience of expression, the detected strain mechanical wave pulse signal is defined as a STOP (STOP) pulse.
Since the transmission time of the strain mechanical wave pulse signal in the waveguide tube is proportional to the distance between the movable magnetic ring and the electronic chamber, the distance can be determined with high accuracy by measuring the time. Since the output signal is a true absolute value, rather than a scaled or amplified signal, there is no signal drift or value change, and no need for periodic re-scaling.
In this embodiment, the input channel includes a differential driving interface (START pin) and a signal receiver (STOP pin) integrated in the magnetic scale conversion card 3, the differential driving interface sends a "START (START) pulse" to START the position measurement of the displacement sensor 2, the signal receiver converts the feedback strain mechanical wave pulse signal into an electrical signal (i.e., "STOP (STOP) pulse"), and the control chip in the magnetic scale conversion card 3 can calculate the actual displacement data of the corresponding displacement sensor 2 according to the interval time between the "START-STOP (START-STOP) pulses" in the same displacement sensor 2, and then pack the displacement data measured by all the displacement sensors 2 in the same manner, and buffer the data into the memory, so that the injection molding machine controller 1 can read the displacement data through the CANbus. Since the transmission of the pulse signal takes a certain time, a new "START" pulse trigger needs to wait for the reception of a "STOP" pulse of the previous cycle before triggering.
In a hardware connection manner, the START pin and the STOP pin of the displacement sensor 2, i.e., the magnetostrictive displacement sensor, are respectively connected to the START pin and the STOP pin of the input channel, so that the input channel can send a "START (START) pulse" to the corresponding displacement sensor 2 and receive a "STOP (STOP) pulse" fed back.
The method comprises the steps that data capture of a Start/Stop ruler sends an INIT application to a Start/Stop digital ruler once every 2ms, return signals of the Start/Stop digital ruler are waited, the position of a movable magnetic ring of the digital ruler is calculated by measuring the time difference of the two signals, the INIT signals are simultaneously initiated outwards by a CPU, eight channels capture Stop signals simultaneously, feedback signals of each channel are recorded by measurement, the feedback signals are packaged and stored together, and when an injection molding machine controller 1 applies for inquiring position information, the position information is fed back to the controller 1 through a CANbus. The 2ms pulse sending interval can improve the collection efficiency of the injection molding machine controller 1 on the displacement data of the displacement sensor 2.
Furthermore, the controller 1 firstly completes the PDO protocol and the STO protocol corresponding to the magnetic scale conversion card 3 through the configuration of a control program, and writes a gradient value corresponding to the displacement sensor 2; after the data packet information in the magnetic scale conversion card 3 is transmitted to the controller 1, the controller program performs corresponding operation according to the PDO protocol and the STO protocol to calculate the actual measurement data of each displacement sensor 2. A display module is further coupled to an output end of the controller 1, and the display module is a device with an image display function, including but not limited to a liquid crystal display, a touch screen, and the like. The controller 1 transmits the calculated measurement data to the display module for display, and is more humanized. The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (4)
1. A communication system of a displacement sensor and a controller is characterized in that: the device comprises a controller (1) and a plurality of displacement sensors (2), wherein a magnetic scale conversion card (3) is arranged between the controller (1) and the displacement sensors (2), the magnetic scale conversion card (3) comprises a plurality of input channels and a first CANbus bus port, the controller (1) comprises a second CANbus port, the plurality of input channels are used for the plurality of displacement sensors (2) to be sequentially coupled, and the first CANbus port is in communication connection with the second CANbus port; the magnetic scale conversion card (3) can measure real-time displacement data of a plurality of displacement sensors (2) and pack the data to form a data packet; the controller (1) actively reads the data packet through a CANbus, and decompresses the data packet to acquire the measurement data of each displacement sensor (2).
2. A displacement sensor and controller communication system according to claim 1, wherein: the displacement sensor (2) is a start/stop digital ruler.
3. A displacement sensor and controller communication system according to claim 1 or 2, wherein: the controller (1) completes a PDO protocol and an STO protocol corresponding to the magnetic scale conversion card (3) through control program configuration, and writes gradient values corresponding to the displacement sensor (2); after the data packet information in the magnetic scale conversion card (3) is transmitted to the controller (1), the controller program performs corresponding operation according to the PDO protocol and the STO protocol to calculate the actual measurement data of each displacement sensor (2).
4. A displacement sensor and controller communication system according to claim 3, wherein: the output end of the controller (1) is also coupled with a display module, and the controller (1) transmits the calculated measurement data to the display module for display.
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| CN201910085123.2A CN111487895B (en) | 2019-01-29 | 2019-01-29 | Communication system of displacement sensor and controller |
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