用PLCSIM测试了一下，应该就是L D[AR1，P#0.0]寻址错误，删掉后CPU的SF灯就不亮了。今天给西门子热线打电话询问了一下为什么这个程序段删除不了的问题，建议我将整个FC块删除试试。我试了一下结果报了错误 (D240)COORDINATION  RULES VIOLATED。图片太大无法上传了，HELP提示是

HELP ON MESSAGE  33：53824 

Description:

 A number of function attempted to manipulate the same objects.Please note that there are function that only manipulate individual blocks(for example,for deleting)and others that influence the entire program(for example,for loading a user program,rearranging process images and local data)   A block could   not be copied because it already exists in the destination and is protcted from overwriting by a current test function (breakpoint,program status).To copy the block,you should terminate the current test function in this case and then repeat the copy procedure.

Remedy:

Repeat the operation.