Need Help with SCH DPS Macro

[giantslayer]

I'm trying to make a macro so that I can dps while targeting the tank

If this is your main reason for wanting to use macros, I suggest focus targeting the opponent/boss (hell, even if you're not dpsing, I'll STILL suggest using focus target, just to be aware of what spell is the boss casting etc).

the macro itself:
/ac "attack spell" <t>
/ac "attack spell" <f>

I agree the best for the OP is to take a different approach, rather than trying to fix his original macro.

I like the way you think. I do the same thing, but with one more line added in for <tt>, so that I can also just attack whoever the tank is attacking without having to designate a focus or switch targets.

Example:
/micon bio
/ac bio <t>
/ac bio <f>
/ac bio <tt>