Hi
you need a supported event procedure. e.g. worksheet_change or
worksheet_calculate. See:
http://www.cpearson.com/excel/events.htm

--
Regards
Frank Kabel
Frankfurt, Germany
"Controls Freak" <Controls schrieb im
Newsbeitrag ...
I am monitoring inputs from a PLC using OPC server software. I want a
change
in state in an input to trigger an EVENT in Excel so I can activate a
SubProcedure. I have tried an IF-then in a cell, using the monitored
input
to no avail.

Public Sub OpDataEntry_Change(ByVal Target as Range)
If Target.Address = ("BR12") Then '("BR12" is the IF..Then cell, which
works.)
(rest of code)
End if
End Sub

Any suggestions?

Regards,

Glenn