When it comes to the S7-200SMART PLC, it typically uses Ethernet communication to exchange data. For instance, the Weilin touch screen now supports communication control with the 200SMART via the network port. But can the 9-pin serial port still communicate with the Weilin touch screen? The answer is definitely yes. So how do we perform the operation? What should we pay attention to during communication? Let’s dive into the technical encyclopedia.
Step 1: Write the Start/Stop Control Program
Friendly reminder: PLC input points use internal M addresses as the touch screen control addresses. The touch screen cannot directly associate with input points I; it must use M or V addresses for conversion.
Step 1: Click to Add Device/Server
Step 2: Set Device Properties Corresponding to Parameter Options
Device Type: Siemens S7-200 SMART PPI
Interface Type: RS-485 2W
COM: Must match the programming cable plugged into the computer’s COM port, here it’s COM3.
Baud Rate: Must be consistent with the programming software, here it’s 9600, other parameters can remain default.
Device Preset Station Number: Must be consistent with the programming software, here it’s 2.
Step 3: Return to the System Parameter Interface and Click Confirm
Step 1: Associate Buttons and Indicator Lights with PLC Corresponding Addresses
M0.0=Start Button
M0.1=Stop Button
Q0.0=Motor Running
Step 2: Demonstration Effect
1. The Weilin serial port online simulation must use a programming cable with a COM port. If using the original Siemens USB-PPI cable, which does not have a COM port, it cannot connect for simulation.
Programming cable with COM port, as shown below:
Siemens original PPI cable or programming cable without COM port, as shown below:
2. When connecting, the COM port, baud rate, and device preset station number must match those of the PLC and programming software; otherwise, communication will fail.
This is the communication between the Weilin touch screen and the S7-200SMART PLC. If you still have doubts, please scan the QR code below for detailed live broadcasts or courses:
Source: Technical Training Network Original, Author: Xu Chenshuang; Unauthorized reproduction is prohibited, violators will be prosecuted!
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