Category: how to

The communication interface of Siemens PLC is how to connect the two wires of RS485 to the 9-pin serial port?

~ arcozhang ~ Leave a comment

The difference between the parallel port and the serial port is that the way of exchanging information is different. The parallel port can transmit information through 8 data lines at the same time, one byte is transmitted at a time; and the serial port can only transmit one bit of data with one line, each time. Transfer one bit of a byte. In serial communication processing, RTS/CTS and XON/XOFF are often seen. This is the two flow control options. Currently, flow control is mainly used in modem data communication, but for ordinary RS232 programming, understand A little bit of knowledge in this area is good.

The programmable controllers produced by SIEMENS in Germany are also widely used in China, and are used in metallurgy, chemical and printing production lines. Siemens (SIEMENS) PLC products include LOGO, S7-200, S7-1200, S7-300, S7-400 and so on.

The door S7 series PLC is small in size, fast in speed, standardized, and has network communication capability, stronger function and high reliability. S7 series PLC products can be divided into micro PLC (such as S7-200), PLC with small-scale performance requirements (such as S7-300) and PLC with medium and high performance requirements (such as S7-400).

In general, programmable controllers can be classified from three perspectives. The first is to classify the size of the programmable controller from the control, the second is to classify the performance of the programmable controller, and the third is to classify the structural characteristics of the programmable controller.

Siemens PLC S7-200 and computer communication connection

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I use the same computer with the same data cable to connect with the PLC, and the PLC224CN PLC connection is normal, why not communicate with a CPU224XP PLC!？

 

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Connect to the computer to set the port. May be USB, maybe COM 2, COM3

Siemens PLC S7-200 is not connected to computer communication:

1, check if the computer has RS232 interface, the programming line and interface are not damaged
Is the USB driver installed and the port set correctly?

2, check if the USB is damaged

3. If there is no problem above, it may be that the communication frequency of the last time the program was written, and the communication frequency of this write is not the same as the communication frequency. At this time, we must use Siemens 5161 card to unlock, reset the communication frequency.

4, if there is still a problem, that is, the communication port of the PLC is damaged.

“Siemens 200 PLC data line selection” problem?

~ arcozhang ~ 1 Comment

PC/PPI programming cable, RS-232/PPI multi-master programming cable and USB/PPI multi-master programming cable What are the differences between the three S7200PLC data cable models, what is PPI, what is multi-master programming

The Siemens S7-200 programming communication cable is divided into two types:
Programming communication cable, PC/PPI, RS232/485 conversion, with optical isolation, maximum 187.5K baud rate, support for multiple master stations;
Programming communication cable, PC/PPI, USB/RS485 conversion, with optical isolation, maximum 187.5K baud rate, support for multiple master stations;

The order numbers are 6ES7901-3CB30-0XA0, 6ES7901-3DB30-0XA0

 

Siemens PLC programming cable usb-ppi can be used for SMART 700?

~ arcozhang ~ Leave a comment

The USB PPI cable is used for programming software and PLC or configuration software and touch screen communication, for program download, Smart series touch screen and PLC have no USB interface, so this cable can not be used for communication between the two.
The communication ports of PLC and touch screen support RS485, the communication ports are 3 feet + 8 feet -, and can be directly connected.

What is the difference between Siemens programming cable and USB-PPI and RS232-PPI?

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The interface is different.

One end of the USB-PPI is a nine-pin head connected to the PPI/MPI interface of the PLC, and the other end is a USB, and a Siemens driver is required. Usually after installing the software such as STEP7.

One end of the Rs232-PPI is connected to the PLC, and the other end is the RS232 port. Generally, the notebook does not have a desktop machine.

However, if you take the PLC of 200, it seems that my classmates use RS232 and then switch to the USB connector, and can connect after installing the driver.

The difference between Siemens s7-200 programming line USB-ppi and communication line pc-ppi

~ arcozhang ~ 1 Comment

Siemens s7-200 programming line USB-ppi and communication line pc-ppi need to be purchased separately. Why can’t the programming line be used directly for communication?
Overview: USB / PPI provides serial connection and RS485 signal conversion and PPI protocol conversion via USB interface. The programming cable emulates the computer’s USB interface as a traditional serial port (commonly referred to as a COM port) under the control of a drive running in the computer, using a variety of existing programming software, communication software, and monitoring software. The working power of this cable is taken from the USB port and is no longer powered by the programming port of the PLC. The two-color LED on the converter box indicates the data transmission and reception status.
How to use: The USB / PPI programming cable needs to be installed with the USB device driver. These drivers are included on the CD-ROM that came with the product. For the installation method, please refer to the documentation on the driver CD, which will not be described here.

After the driver is installed, the COM port corresponding to the USB / PPI programming cable will appear in the Windows Device Manager. Simply select the COM port in the programming software or other application software, the next time you use the same as the traditional RS232. The port programming cable is identical. It should be noted that the programming cable does not support the “USB” option for the local communication port settings in the programming software.

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.
2. Open the programming software and set the PC/PG interface and select USB.
3. The computer and PLC are connected to upload/download programs via USB/PPI cable.

How to realize the communication connection between Mitsubishi FX1S series PLC and computer? USB communication line

~ arcozhang ~ 2 Comments

USB-SC09 is the programming cable of Mitsubishi PLC. Before using it, first install the driver of the programming cable.

After the installation driver is finished, make a simple setup.

The setting method is as follows. Right click (My Computer) and click Properties. The (System Properties) dialog box is displayed, select the hardware, and click (Device Management).

Select (port), find the USB port you installed, right click to display (property) click, display the property dialog bar, select (port setting) to set the COM port of the advanced setting in this dialog box to be in the PLC programming software. The settings are the same.