发布于 2012-08-24 14:42:28
4楼
更新被调用块后应该同时更新调用块
参考:
STEP 7 displays a time stamp conflict if it detects a violation of the rules when comparing time
stamps. The following violations may occur:
? A called block is more up-to-date than the calling block (CALL)
? A referenced block is more up-to-date than the block which is using it
? Examples of the second type of violation:
? A UDT is more up-to-date than the block that is using it; that is, a DB or another UDT, or an
FC, an FB, or an OB that is using the UDT in the variable declaration table.
? An FB is more up-to-date than its corresponding instance DB.
? An FB2 is defined as a multiple instance in FB1 and FB2 is more up-to-date than FB1.