Abstract: This paper discusses the toothpaste capping machine control system in the human-machine interface and can be programmed sequence control device and servo systems of the relevant communication and data exchange issues, which make the response speed servo system with the mechanical torque limit match, in order to achieve the capper on toothpaste toothpaste packaging technology requirements. HMI Human Machine Interface planning shown in Figure 3.
Keywords: Servo System HMI PLC communication function of response speed torque limit
Abstract: The paper mainly discussed the related problems of communication and data exchange in control system for toothpaste close over machine among human machine interface, programmable controller and servo system. And it is able to make the good match between mechanism torque limitation and response speed of servo system so as to realize the demand of toothpaste close over technics for toothpaste close over machine.
Key words: Human machine interface Programmable controller Servo system Communication function Response speed Torque limitation
1 Introduction
Toothpaste capping machine is a mechanical and electrical integration of the product , its core is the control system. The control system scheme is based on DELTA (Delta) AE series of man-machine interface, SS series PLC, ASD-A servo system products of the organic mix, with its product data communications capabilities to construct a very flexible control program, which compared to conventional The D / A analog control has a higher reliability, control of the advantages of more accurate. The following focuses on how the system communication capabilities to achieve during the data exchange and how to make the servo system response speed and mechanical torque limiting matches to achieve the capping machine in toothpaste toothpaste packaging process requirements.
2 toothpaste capping machine process requirements and the mechanical structure
Toothpaste is toothpaste packaging capping machine production line of critical equipment, mainly used for toothpaste filling capping after the action, its technology requirements are as follows: (1) package to cope with front-end speed filling line feed rate and speed can be encapsulated regulation; (2) can be configured toothpaste capping torque and torque only in the package before it reaches the set value to packaging, to ensure quality packaging of toothpaste cap; (3) able to detect the parameters of incoming and automatic feeding. Toothpaste capping machine mechanical structure shown in Figure 1.
Figure 1 toothpaste capping machine diagram of the mechanical structure
3 control system hardware configuration and functional design
By the mechanical process characteristics and functional requirements analysis to determine the Programs in Control unit achieved using PLC, HMI human-machine interface as a monitoring unit, select SERVO????±???¨unit as the speed and torque control unit, in order to meet the mechanical electrical control of the hardware requirements, electrical system control architecture shown in Figure 2.
Control system hardware architecture >
Figure 2 Electrical control system hardware architecture
1) PLC program control unit
Process control unit is DELTA SS series of small PLC, its main features are:
(1) small size, lower cost;
(2) 14 points Host Design, 8 digital input and 6 output transistor;
(3) Built-in RS232 and RS485 Dual communication port, you can use communication methods to read HMI configuration data.
PLC I / O point plan as shown in Table 1, PLC and HMI associated with the definition of M auxiliary relay as shown in Table 2.
2) HMI monitoring unit
HMI Monitoring Unit The main tasks include:
(1) mode function selection (operating mode M3, monitor mode M2, parameter model M1);
(2) control functions (operation M4, stop M5);
(3) monitoring (PLC I / O status of the read servo I / O status of reading, number and other information processing);
(4) Parameter setting function (speed setting servo capping, capping torque servo settings).
HMI control unit with DELTA DOP-A 5.7 series of color man-machine interface to realize the control system operation, monitoring and parameter setting and other functions, has the following main features:
(1) 256 color display, 5.7 control interface;
(2) dual communication line features, can connect 2 different protocols of control , can help structure the online multi-machine network ;
(3) software built and Delta PLC and servo communications and internal protocols, easy programming , simplified design;
(4) can be set through multi-level password management features to achieve multi-user;
(5) built-in calendar function.
HMI supports dual communication line features, can connect 2 different protocols of control devices. Case using the HMI and PLC for the COM2 RS485 communication , to set the PLC program the buttons and other components, the operation can be PLC state feedback in the HMI, the HMI also use the COM1 and RS232 SERVO for communication to internal registers to exchange data with the servo, architecture, see Graphic 2.
The advantages of the program without any additional communication module , the control function is in the control unit s own hardware and software communications capabilities built on the basis of implementation, therebyIn order to lower the cost of the application more convenient, more stable performance.
Figure 3 Schematic diagram of human-machine interface planning
Table 3 and Table 4 shows the various elements of the respective instructions.
Table 3 Table 4
3) SERVO speed and torque control unit
SERVO unit main tasks include:
(1) of the blocks when the motor speed of adjustment;
(2) capping the maximum torque the motor output of the regulation and inspection.
SERVO unit is DELTA ASD-A Series 100W servo system to achieve the speed of the mechanical seal during control and maximum torque for capping limit. It has the following main features: In addition to the traditional position control , speed control and torque control , there are PR communication mode, the internal velocity and internal torque function; built RS232/RS485/RS 422 communication port, you can use communication means quick access data; with torque limit function, open the function, to limit the maximum motor output torque. Servo unit parameters set as shown in table 5.
Table 5 servo set the main parameters
Required at this point.
(1) The description of the internal speed mode
Servo speed mode is mainly used on the machine precision higher speed situations. Servo unit has two command input mode, that is, the external analog input (ie, S speed mode) and internal registers input (ie, internal SZ speed mode). When you select SZ mode, you can communication means to change the command registers 1-09 (address 0109H) of the content value, and also through the DI-SPD0 servo external input switching command, as shown in table 6, SZ mode timing diagram shown in Figure 4. Can see from the above, the internal speed mode, as long as 1-09 to change the contents of internal registers servo value, you can change the speed of servo motor implementation of the blocks.
Table 6 command to switch
Figure 4 SZ mode timing chart
(2) on the maximum torque limit function description
Servo torque limiting function by external DI2 TRQLM opens servo motor to set the value of the maximum output torque = motor rated output torque 97P1-12 settings%, unit NM. 100W rated torque of the servo system 0.318NM, when the P1-12 set to 10, the motor maximum output torque = 0.3189710% = 0.0318NM. When the servo torque limit function is turned on, by the communication means to change the command registers 1-12 (address 010CH) the contents of the value of DI can be input by the external servo torque command to switch the source. When the motor output torque reaches the set maximum output torque of the motor, the power will stop running, and to maintain a form of reaction, while the DO output TQL servo unit will be changed from the OFF ON, torque limiting function of timing diagram Figure 5.
Can see from the above discussion, as long as the torque limit function in the open under the premise of changing the internal registers 1-12 servo property values, you can limit the size of the servo motor output torque.
Figure 5 Timing diagram of torque limiting function
(3) Other auxiliary units
Other support units also include a control circuit to provide power switching power supply DC24V, DC24V miniature solenoid valves, as well as external emergency stop buttons and other auxiliary electrical components.
4 process program design
Toothpaste capping machine control system is not complicated, but there are strict requirements on the process. According to production line equipment to process all aspects of the specific requirements of the process, analysis can be drawn through the entire production process, process action flow chart shown in Figure 6. Under the action flow chart of the preparation of the various sub- modules of the relevant procedure is not difficult, the specific procedures in this omitted.
program action flowchart >
Figure 6 procedure action diagram
5 Conclusion
In the Delta-based HMI + PLC + SERVO toothpaste capping Control System case, the article explained the basic principles only. With Delta product , according to communications capabilities of the advantages that can be flexible to construct Gezhong Kongzhi program, which compared to conventional D / A??¨????volume control is more reliable, better stability, control of the advantages of higher precision.