Brief Introduction
The automatic sticking machine cuts and glues the plywood to a certain depth through a preset tool, and then conforms to the wooden strip sent by the servo， in last to form a woodworking product.
Process Requirement
Based on the control of the strip device technology, six new stepper motor controls are added to achieve the tool distance setting function, which can be quickly move to a preset distance to achieve precise control.

Solution Analysis
The control system adopts the HMI LEVI2070D, and the PLC LX3V-1616MR2H and two LX3V-4PG expansion modules.
Reasons for selection: Woodworking machinery mostly uses relay type PLC as the main control, and directly controls peripherals such as solenoid valves or inverters. At the same time, the customer requires compatibility with the previous control scheme, and the tool can be changed to mechanical manual tool setting.

Therefore, in the selection, the number of relay points of LX3V-1616MR2H meets the requirements. In the aspect of 6 tool control, the LX3V-4PG expansion module can be used uniformly to meet the requirements. Based on the above factors, the selection configuration was carried out.
Main control principle: The original servo control still uses the output point on the PLC for control. The original program does not change. The new program only increases the control of the LX3V-4PG to 6 stepping motors.
To realize the fixed-length operation control of the stepping motor in the program, it is necessary to have all functions such as finding the origin, manually jogging, manual shifting, and automatic running. Provide debuggers with as many modes of operation as possible to achieve the best debugging results and user experience.

Program Brief Introduction
HMI program
Main Page

Motor Setting Page

Detailed Debugging Screen of One of the Stepper Motors

PLC Program
LX3V-4PG Manuel Setting

Project Summary
During the debugging, there was a problem that the positioning of the stepping motor was inaccurate. After many tests, the solution was found. That is, it is necessary to connect a 2K resistor in series between the pulse and direction of the stepping motor. This has something to do with the brand of the driver of different stepping motors. It is recommended that the customer do the serial processing regardless of the brand to ensure the accurate operation of the equipment.

This debugging summarizes the following points:
1.Select the plan according to the needs, not only considering the cost, but also the compatibility of the general program.
2.For the LX3V-4PG expansion module, it is necessary to pre-plan the address. The control requirements of the six stepper motors are the same, but the addresses are different. If you can pre-plan the addresses nicely, you can get twice the result with half the effort.
3.For problems that arise during debugging, be sure to check them from start to end, eliminate the factors of the problems one by one, and finally fix the problems.