How do I identify my Festo cylinder?

Thanks all for your suggestions. Sorry for the lack of details.
The valve which is controlling the cylinder is a 5/2 valve with 3/8 NPT ports. In fact we replaced an old system (a TI PLC with a AB PLC)and we decided to change also some pneumatics (bad idea...).
Before, the cylinder was controlled by a 5/2 solenoid valve (spring return) triggered by a PLC digital output, the only thing we changed was that we put an air actuated valve (spring return also) instead the solenoid valve. The air for the signal comes through a 1/8 hose from the Festo.
Both the valve supply and signal come from the same source - we have 80 PSI. The length of the hose for the signal is about 40 feet, the same is the length from the supply to the valve. The distance between the valve and the cylinder is about 3 feet.
The cylinder is mounted vertical.
My main problem is not the response time (I can anicipate the command in the PLC) but the fact that the response is not constant.
I made some tests:
- for 1 minute, I triggered a 200 msec command every second -- sometimes the cylinder went at full stroke, sometimes it went half stroke, sometimes it didn't respond. If I decreased the command time at 150msec, most of the time the cylinder didn't move at all. If I increased the command time at 250msec, the cylinder responded always but the time it stayed at full stroke was visibly inconstant (I cant tell how much exactly but it was visible). Here I have to mention that the PLC cycle time is about 30msec and stays steady at this value all the time. I have no idea about the response time of the DNET module of the Festo block but it shouldn't be a problem (for an AB VFD I measured a max. of 30 msec delay on DNET so it should be OK, but maybe the Festo module is not so fast - I'll check the specs).

Thanks again all for your help.

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I have a solution but it is too expensive.
http://deltamotion.com/peter/Videos/PneuMove2.mp4
We have algorithm to do what you want to do but like I said. It is too expensive and setting up the gains is tricky. Pneumatics is a pain in the &#;. because the friction in the cylinder is never consistent so gains needs to change. The air is not clean and that affect the cylinder friction.
The reason why we test with pneumatics is because if you can control pneumatics then controlling hydraulic cylinders is easy.

You can probably kludge something together that will do what you want but by the time you get done you will spent more in man hours than the hardware and electronics.

This is extremely difficult to do and almost impossible with a PLC unless you really know what you are doing.I have a solution but it is too expensive.We have algorithm to do what you want to do but like I said. It is too expensive and setting up the gains is tricky. Pneumatics is a pain in the &#;. because the friction in the cylinder is never consistent so gains needs to change. The air is not clean and that affect the cylinder friction.The reason why we test with pneumatics is because if you can control pneumatics then controlling hydraulic cylinders is easy.You can probably kludge something together that will do what you want but by the time you get done you will spent more in man hours than the hardware and electronics.

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