How do you implement variable transfer in formats such as VW VD when performing PPI communication between Siemens S7-200 plc?

~ arcozhang ~ Leave a comment

The NETR/NETW instruction can read and write the M and V variables of the partner (communication partner). Since the M area has limited space (maximum 32 bytes MB0 to 31), the V variable area (10240 bytes) is commonly used as the buffer for communication. Two buffers are identified in each PLC, one for reception and one for transmission.
Programming only needs to call the subroutine created by NETR/NETW in the master station. Then (the main and slave have to do) is to sort the I and AI input data into the send buffer in the v variable area, and then read the receive buffer. The data in the receive buffer of the partner are the same as the data in the send buffer here. Similarly, the data in the receive buffer can be interpreted by reading the data in the receive buffer.
Setting cpu224xp as a slave does not affect the touch screen plugged into PORT1. The two serial ports are separate from each other and can be used separately as master and slave respectively because they have different interrupt numbers. .

How does the Siemens PLC S7-200 communicate with the computer?

~ arcozhang ~ Leave a comment

1. Just open the device manager of your computer. After installing the driver under normal conditions, a different serial port will be generated. Please write down the generated serial port, as shown below:
2, open the Siemens programming software, if your 200 series PLC is with CN, please change the software to the Chinese version, and the software version needs to be above V4.0 SP4, the above two conditions are indispensable. If it is not CN, except for these two points.
3. Click on the software and the following window appears.
4, click , the following window appears,
5. After selecting “PC/PPI cable (PPI) ”. Point attributes,
6, this step is extremely important, the port here must choose the cable to install the driver generated serial port, remember! Otherwise it is not possible to communicate. The port can be seen in the device manager.
7. Switch to the “PPI” tab. The default value of “Address” is 0. Do not check the two options for “Network parameters”. Otherwise it is not possible to communicate. The “transmission rate” can be selected according to the actual situation of the PLC.
8, after setting these up. All the way down. Then return to the communication interface, double-click “Refresh” to locate the model of the PLC, you can download the program.

Siemens s7-200, usb-ppi communication steps

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Siemens s7-200, usb-ppi communication steps:
1. Install the USB-PPI driver and look at the serial port generated in the device management. Connect the computer with STEP 7 MicroWIN programming software with S7-200PLC and USB/PPI cable.

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2. Just open the programming software and set the PC/PG interface and select USB.

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3. The computer and PLC are connected to upload/download programs via USB/PPI cable.

How does the computer communicate with Mitsubishi Q series PLC?

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Mitsubishi Q series PLC communication parameter settings:

Check digit: odd parity, data bit: 8, stop bit: 1.

Set the communication parameters of the COM port of the computer to the communication parameters of the PLC. Then open the PLC programming software, just click on the connection to PLC.
If it is Q02H series, you can also use the normal USB interface printer line connection programming.
The difference with the A series PLC is: select the transparent mode in the dialog box that appears when connecting the A series PLC.
The Q series does do not seem at all.