Programming in OB81

finskhan

Member
F
Join Date
Oct 2006
Location
Multan
Posts
87
hello guys

Im newly born baby in the world of PLC.I was studying the OB81 which is programmed for the battery indication.When i study the sample programme in the siemens manual i found two different variables one is OB81_FLT_ID and the other is OB81_EV_CLASS.I was really confused with two variables used at the same time.When OB81_FLT_ID can set the variable so why we use the OB81_EV_CLASS.So we can use only one varible OB81_FLT_ID to programme the OB81 or it is requrired the OB81_EV_CLASS.Plz if u have some idea plz share it with me.
Regard
Finskhan
 

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