How do you control the length a piston will extention/retraction?

[Racer26]

This is incorrect. The 2nd valve will not switch without pressure in the P hole. I believe the SMC valves require about 20psi to switch. A method that will work, is looping the A and B ports together on the 2nd solenoid, feeding EA, EB, or both from solenoid 1 to the P port (for one direction, the other, or both) on the 2nd solenoid. plugging EA, and leaving EB open to atmosphere. I would recommend using a Single Solenoid for the 2nd one.

Basically the system looks like this:

Pressure in-->|Solenoid 1|-EA------P-|Solenoid 2|--EA--|
...................|________|-EB-/..........|________|--EB------
......................A|....B|.................... A|....B|
................----|cylinder|.....................\___/