请问300如何通过CPU模块上的开关，来清程序。具体方法，帮我写一个发到我的邮箱，谢谢，FENG-JIE@VIP.SINA.COM 。我看了手册有，但看不明白

You can use the following procedure to delete the block on an MMC in the CPU:
1.The MMC to be deleted is slotted in the CPU.
2.In the SIMATIC Manager, switch to online mode via "View > Online" or by pressing the appropriate button.
3.In the Online window, you select the block folder.
4.Select all the blocks in the folder which you want to delete.
5.Click the "Delete" key on your PC keyboard (you can acknowledge the message that system functions cannot be deleted).