1747-L541 AB Servo Motor

1747-L541 19-01-21 AB Servo Motor

1747-L541 19-01-21 communication interface is written in vb language, there is a control microsoft comm control (mscomm control for short) in vb to provide serial communication. In the programming process, as long as you set the properties of the mscomm control, you can realize the serial communication. mscomm control is usually not included in the common tool box, you need to right click on the right side of the tool box in the blank space, select the components option, then the components dialog box will appear, in which the controls tab will be found under the Select microsoft comm control 6.0 and click OK to add the control to the right toolbox.

1747-L541 19-01-21 simulates the control surface of an oil machine’s power distribution panel. The software collects, displays, and stores real-time signals of three-phase output voltage, current, and power factor, and collects the equipment’s operating status and fault conditions into a database. The control surface above a series of control buttons, click a button will send the corresponding control command to the lower computer to control the lower motorized operation.

1747-L541 19-01-21 In the communication process, since the computer is the host and the plc is the slave, the plc sends data only after receiving the information sent by the computer. The number of times the computer sends data is not a one-to-one correspondence with the number of times it receives data, every time the computer clicks on the button that sends a control command (see Figure 1), the plc should transmit to the computer all the data stored in its buffer, and every time it triggers an oncomm event can only transmit 8 bytes, so if the plc’s transmit buffer a total of 50 data right, then every request to Therefore, if there are 50 data in the send buffer of the plc, then every time a data is requested to be sent upwards, 7 oncomm events will be triggered accordingly, and every time an oncomm event is triggered, the program will be executed until the end sub. This can be achieved by adding the test statement “debug.print ‘start'” to the program that sends the data, and adding a test statement “debug.print ‘end'” before the end sub ‘end'” before the end sub, we can clearly see in the immediate window that there are 7 ends after each start.