Issue in connecting sub VI programs through the main program

Sir/Madam,
I have made a few sub VI programs of 'Keithley 2400', but I am having problem in connecting them together through the main program. Actually the created sub VI programs are not showing any activation button when I connect 'action.vi' file in 'read.vi' file (attachted).
Please give suggestions.
Regards
Yachika Manglik
Solved!
Go to Solution.
Attachments:
action.vi ‏24 KB
read.vi ‏14 KB
write.vi ‏24 KB

Hello
Thanks for your suggestion.
I have successfully implemented connections in my code according to your given suggestion .
Now I am facing problem to link a file named 'control1.ctl'(attached) that I have made for selecting option 'select type of action' and need to add' control1.ctl' in 'read.vi' file. It is showing following error( below).
Error: " required input ' GPIB action' is not wired.
OR
"Enumeric conflict"
So can you please suggest how this error can be removed?
Attachments:
Control 1.ctl ‏5 KB
read.vi ‏13 KB

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