冗余系统硬件配置为：两个CPU315-2DP，MPI连接用于冗余数据交换，IM153-2一对，CPU上集成的DP口分别连接IM152-2的DP口构成冗余系统。IM153-2上挂接一个DI模块、一个DO模块、一个CP341模块（用于和CPU226XM的自由口模式通讯）。
现在的问题是
一：在FC100中定义DB_NO、DB_NO_LEN 、DB_A_B_NO 、 DB_A_B_NO_LEN 、 DB_B_A_NO、 DB_B_A_NO_LEN后CPU就出现错误，而当长度定义为0时主从连接正常，错误如下：
Event 1 of 100: Event ID 16# 4541
STOP caused by priority class system
Event: Cycle time exceeded
OB number: 132
Priority class: 26
Previous operating mode: RUN
Requested operating mode: STOP (internal)
Internal error, Incoming event
01:12:10:726 pm 06/10/04

Event 2 of 100: Event ID 16# 2522
Area length error when reading
Global DB, double-word access, Access address: 4382
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
01:12:10:725 pm 06/10/04
非常感谢您的指点！