OPN DB

L MD10 （源数据REAL型）
T DBD[MD50] （MD50是双整型）

程序运行过程中一直有错，
错误代码：
Diagnostic buffer of module CPU 313C-2 DP

Order No./ Des cription Component Version
6ES7 841-0CC04-0YE0 Firmware V 5.3.0

Rack: 0
Slot: 2


Event 1 of 100: Event ID 16# 2529
Alignment error when writing
Global DB, double-word access, Incorrect address: 0
FC number: 11
Module address: 348
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
01:19:10:429 pm 07/05/05


请问问题到底出在哪里啊！！！