The documentation for the two possible wiring conventions is
here.
Quote:
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Originally Posted by GDC
Festo is committed to supporting the FIRST program. This year they encountered an unexpected problem, although not unsurmountable, in the production of the valve kit. The wiring of the valves supplied this year is different from the valves supplied in previous years. Rather than scrap a large number of valves or jeopardize meeting the deadline for the kit, Festo has updated the wiring instructions to enable you to use a valve of either wiring configuration. If after going through the instructions you cannot operate the valve please call the Festo Customer Resource Center at 1-866-463-3786 so they can troubleshoot or arrange to get you a replacement valve.
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(From
here.)