PROSAGA码农传奇-PLC/vPLC-贝加莱PLC。写入后计算新偏移量或如何将数据写入新行

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    正如评论中已经提到的，您需要相应地在FileWrite FUB中设置偏移量。
  
  
    我通常使用FileInfo FUB Guid执行此操作
    
      6eaf42f0-4ce5-44b7-95cb-275ae1c2fac5
    
     在AS帮助。它会告诉您文件是否已存在以及文件大小。
  
  
    如果存在，则下一步是FileOpen，否则为FileCreate。
  
  
    最近我在GitLab上创建了一个小项目，其中包括在文件中附加一行：
    <a href="https://gitlab.com/kirni/bur_robotic_sample/blob/master/bur_robotic_sample/Logical/Libraries/TeachLib/Teach.c" rel="nofollow noreferrer">
      https://gitlab.com/kirni/bur_robotic_sample/blob/master/bur_robotic_sample/Logical/Libraries/TeachLib/Teach.c
    </A>
  
  
    代码在C中，但我相信你明白了。
  
   <pre>
 <code>
 case stTEACH_INFO:

/*setup fub*/
            this->fbInfo.enable = 1;
            this->fbInfo.pDevice = (UDINT)inst->szDevice;
            this->fbInfo.pName = (UDINT)inst->szFile;
            this->fbInfo.pInfo = &this->Info;

//call fub
            FileInfo(&this->fbInfo);

//fub is done..
            if(this->fbInfo.status != ERR_FUB_BUSY)
            {
                //file exists -> open it and append code
                if(this->fbInfo.status == ERR_OK)
                {
                    //start writing to the end of the file
                    this->Offset = this->Info.size;

//open existing file
                    this->Step = stTEACH_OPEN;
                }
                //file does not exist -> create it and insert code
                else if(this->fbInfo.status == fiERR_FILE_NOT_FOUND)
                {
                    //start writing at the beginning of the file
                    this->Offset = this->Info.size;

//crete new file
                    this->Step = stTEACH_CREATE;
                }
                //error
                else
                {
                    //set error status and goto error state
                    inst->Status = this->fbInfo.status;
                    this->Step = stTEACH_ERROR;
                }

//disable fub
                this->fbInfo.enable = 0;            
                FileInfo(&this->fbInfo);
            }

break;

case stTEACH_CREATE:

/*setup fub*/
            this->fbCreate.enable = 1;
            this->fbCreate.pDevice = (UDINT)inst->szDevice;
            this->fbCreate.pFile = (UDINT)inst->szFile;

//call fub
            FileCreate(&this->fbCreate);

//fub is done..
            if(this->fbCreate.status != ERR_FUB_BUSY)
            {
                //success
                if(this->fbCreate.status == ERR_OK)
                {
                    this->Ident = this->fbCreate.ident;

//open existing file
                    this->Step = stTEACH_WRITE;
                }           
                //error
                else
                {
                    //set error status and goto error state
                    inst->Status = this->fbCreate.status;
                    this->Step = stTEACH_ERROR;
                }

//disable fub
                this->fbCreate.enable = 0;          
                FileCreate(&this->fbCreate);
            }

break;

case stTEACH_OPEN:

/*setup fub*/
            this->fbOpen.enable = 1;
            this->fbOpen.pDevice = (UDINT)inst->szDevice;
            this->fbOpen.pFile = (UDINT)inst->szFile;
            this->fbOpen.mode = fiREAD_WRITE;

//call fub
            FileOpen(&this->fbOpen);

//fub is done..
            if(this->fbOpen.status != ERR_FUB_BUSY)
            {
                //success
                if(this->fbOpen.status == ERR_OK)
                {
                    this->Ident = this->fbOpen.ident;

//open existing file
                    this->Step = stTEACH_WRITE;
                }           
                //error
                else
                {
                    //set error status and goto error state
                    inst->Status = this->fbOpen.status;
                    this->Step = stTEACH_ERROR;
                }

//disable fub
                this->fbOpen.enable = 0;            
                FileOpen(&this->fbOpen);
            }
            break;

case stTEACH_WRITE:

/*setup fub*/
            this->fbWrite.enable = 1;
            this->fbWrite.ident = this->Ident;
            this->fbWrite.offset = this->Offset;
            this->fbWrite.pSrc = this->szLine;
            this->fbWrite.len = this->Lenght;

//call fub
            FileWrite(&this->fbWrite);

//fub is done..
            if(this->fbWrite.status != ERR_FUB_BUSY)
            {
                //success
                if(this->fbWrite.status == ERR_OK)
                {
                    this->Ident = this->fbWrite.ident;

//Write existing file
                    this->Step = stTEACH_CLOSE;
                }           
                    //error
                else
                {
                    //set error status and goto error state
                    inst->Status = this->fbWrite.status;
                    this->Step = stTEACH_ERROR;
                }

//disable fub
                this->fbWrite.enable = 0;           
                FileWrite(&this->fbWrite);
            }
            break;

</code>
 </pre>
  
    然而，这也应该与
    
      filelen
    
     FileOpen FUB的输出 - 就像你做的那样。我建议你在写入之前设置一个制动点，并检查是否正确设置了FUB的偏移量。
  
  
    我还建议你在完成后再调用每个FUB
    
      使：= 0
    
     （就像我在我的样本中所做的那样）即禁用它。有些FUB只在更高的边缘更新输入参数
    
      启用，执行，启动，
    
     等输入命令。
  
  
    我希望这有帮助！
  
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