Start the program when an external limit switch change its position

Question

i have a DAQ card 6036E and have a limit switch.
my problem is:
when certain contact of limit switch is open, certain loop is work, and when the contact change its status the first loop stop and a second loop starts.
for details
    limit switch contact open & i press start of the program
           loop one stars which is 10V analog output
                   the limit switch contact closed
                          loop one stops and loop two starts which is (digital out + 5V analog out)
thank you

Answer 1

Hello Nick F,
Thank you very much for your reply and i am so sorry for less details of my previous message so, here more discussion:
I control the position of a reobatic arm, at starting of the program the arm may be in any position so i must move the arm to a referance position by making a program to give analog 5V through analog output pin of the DAQ to the to the DC motor controller card to then to the motor which drive the arm, when the arm arrives to its referance position  hitting a limit swich which will give a digital signal to digital input pin of the DAQ, here, my object is to stop the obove program (or loop) to stop the arm, at the same time i want to run another program or another while loop on the same program which is an LV example (control single channel.vi) (which is an PID controller program to move the arem to a desired position.
that's all
please reply me quickly
thank you