Hello experts, 

Can you please help me to understand meaning of below instructions? 

ID=1 WHENEVR $A_DBB[0]=0  DO$A_DBB[4] =$AA_IM[X]  $A_DBB[0]=1

Thanks in advance 

AutoGen_497010

Hello experts, 

Can you please help me to understand meaning of below instructions? 

ID=1 WHENEVR $A_DBB[0]=0  DO$A_DBB[4] =$AA_IM[X]  $A_DBB[0]=1

Thanks in advance 

 Every time condition $A_DBB[0]=0 (PLC FC21 ADRES 0)  is satisfied will be executed loading of current axis X value in MCS to $A_DBB[4], also $A_DBB[0] becoms TRUE.

Try to use forum search befor starting thread.

Similar threads:

https://support.industry.siemens.com/forum/ww/en/posts/what-is-the-meaning-of-a-dbb-308-or-a-dbb-318/200914

https://support.industry.siemens.com/forum/ww/en/posts/what-is-the-difference-between-when-and-whenever-in-synchronized-action/29938

Hello, 

Thanks for the reply. 

Does it mean,  that X axis MCS value will be transferred to FC21 DBB[4] when FC21 DBB[0] = 0.

IS my above understanding correct? 

AutoGen_497010

Hello, 

Thanks for the reply. 

Does it mean,  that X axis MCS value will be transferred to FC21 DBB[4] when FC21 DBB[0] = 0.

IS my above understanding correct? 

 Yes, you assume right