S7-300 Alighment error
Alignment error when writing
Event 1 of 10: Event ID 16# 2529
Alignment error when writing
P area, double-word access, Incorrect address: 0
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
08:27:08.621 AM 04/28/2013
(Coding: 16# 2529 0179 0030 0000 0000 0000)

Check help:
Cause:
A bit address (bits 0 to 2) was specified for byte, word, or double word access.

To correct or avoid errors:
Make sure that the bit address contains access address 0.

CPU的SF灯闪烁，怎样才能让红灯不闪啊？