Foreword: At this stage, the surface bag stitching work mainly depends on the artificial way of placing the bag on the equipment for sewing. Labor is labor-intensive and inefficient. Under this circumstance, the fully automatic double-stitch machine appeared before the majority of users.
First, control requirements
It is required that the PLC control three inverters, two servo controllers, and multiple relays to realize the cooperation of the devices.
Second, the hardware configuration
PLC: T48S2T Transistor Output PLC
The controller selects T48S2T from the sea, 220V AC power from external host, 28 DI channels, and 20 DO transistor outputs. It comes with two communication ports (RS232+RS485), two 200K high-speed pulse inputs, and two 200K high-speed pulse outputs.
The system needs to have 3 sets of frequency converters to feed the running speed so as not to make the joints of poor quality due to excessive speed. The T48S2T main unit has its own RS485 port, which can be used as a master station and 3 frequency inverters to achieve high-speed communication functions, and give the drive the speed and speed commands. With the analog expansion to save a certain cost. The RS232 interface is used to communicate with the system's touch screen to achieve control process settings. Two high-speed inputs are connected to the encoder and the speed of the device is measured. Two high-speed pulse outputs are connected with the servo controller to control the system's loading and feeding requirements. Therefore, the use of a T48S2T host can easily achieve the above functional requirements and does not require redundant procurement expansion units. There is no need to increase unnecessary costs, saving customers the cost of use.
Third, the program part
Sea is a simple PLC communication program. No matter which communication protocol you use, you only need one communication command to complete the complex communication functions.
In this example, the baud rate of the inverter is 9600. The data format is N,8,2. The following is an example program for frequency inverter communication.
In this case, the high-speed pulse input reads the encoder's operating distance and speed.
The high-speed pulse output of this case controls the operating distance and speed of the servo controller.
Forward rotation and inversion control are the same writing principles.
Fourth, summary
The sea is a domestic boutique in the PLC. After a long period of use and operation, the stability is high and the processing speed is fast. Very good completion of the complex requirements of the equipment, has been highly recognized by users. The reliability of equipment movements has reduced the labor intensity of factory workers. Received high praise from the workers.
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