update descriptopn for pnet project

projects/etherkit_profinet_pnet/README.md

@@ -175,18 +175,26 @@ You should see the PN master successfully online:
 
 ## PROFINET Slave Application Startup
 
-Start the PROFINET slave on the development board by executing the command: `pnet_app`:
+Here we use the CODESYS software to test the interaction between the PN master and slave stations.
 
-![image-20241126114538916](figures/image-20241126114538916.png)
+### LED Blinking
 
-![image-20241126114547482](figures/image-20241126114547482.png)
+Back in the CODESYS software, in the left navigation panel, select `PN_Controller`, right-click and scan the devices. After clicking on the device name, click on "Blink LED":
 
-## PN Protocol Stack Demo
+![image-20241126114601251](figures/image-20241126114601251.png)
 
-In CODESYS, test the master-slave interaction by selecting **PN_Controller** in the left navigation bar, right-clicking **Scan Devices**, selecting the device, and clicking **Blink LED**:
+At this point, the development board (PN slave I/O) will display log outputs, accompanied by the onboard User LED blinking:
 
-![image-20241126114601251](figures/image-20241126114601251.png)
+![img](figures/clip_image050.jpg)
+
+### Modifying Slave I&M (Identification and Maintenance) Data
+
+In the same device scanning interface, click on the I&M section in the lower left corner, modify the information, and write it to the I&M:
+
+![image-20241209165958786](figures/image-20241209165958786.png)
+
+At the same time, PNIO will update the slave station configuration:
 
-The development board’s logs should display output and the onboard **User LED** will blink:
+![image-20241209170011069](figures/image-20241209170011069.png)
 
-![img](figures/clip_image050.jpg)
+We can click to view the I&M again, and we will see that the I&M data has been successfully modified!

projects/etherkit_profinet_pnet/README_zh.md

@@ -187,10 +187,24 @@ GSD(Generic Station Description file)：即通用站点描述文件，主要用
 
 这里我们使用 CODESYS软件来测试 PN 的主从站交互。
 
+### LED闪烁
+
 回到 CODESYS 软件，左侧导航栏选择 PN_Controller，右键点击扫描设备，单击设备名后点击闪烁LED：
 
 ![image-20241126114601251](figures/image-20241126114601251.png)
 
 此时的开发板端（PN从站IO）可以看到日志输出，并伴随板载User LED闪烁：
 
-![img](figures/clip_image050.jpg)
+![img](figures/clip_image050.jpg)
+
+### 从站 I&M(标识和维护) 数据修改
+
+依然是扫描设备界面，我们点击左下角的 I&M，修改信息并写入 I&M：
+
+![image-20241209165958786](figures/image-20241209165958786.png)
+
+同时 PNIO 会更新从站配置信息：
+
+![image-20241209170011069](figures/image-20241209170011069.png)
+
+我们再次点击查看 I&M，即可发现 I&M 修改成功！