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NI Modbus not sending command over RS 485

I am using Standard NI Modbus library for my application of communicating the modbus devices over RS 485.
I have build the simple vi with:
Ouside while loop
1. Ceate modbus
 
Inside while loop
2. Set active device
3. Read holding registers
4. Delay 1 sec
 
But, this is not sending query to modbus devices after every second.
Can anybody tell the reason or solution?
 
Kausty
VI AUTOMATION (P) LTD.
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Please post your VI so we can help.
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