Triggering sequence on an Output

I have set up a button to turn a pump on and off, would like to trigger a different sequence depending whether the pump is on or off.  Below is what I have and keep getting an error "C1070 Not enough parameters for given operator  START line 3".  Can you do this on an output all the examples that I have seen have been on inputs.  Anyone have any examples of doing what I'm trying to do?

while(1)
   read (PUMP)  
   if (PUMP = 1)
      beginseq(On_Sequence)
   endif
   if (PUMP = 0)
      beginseq(Off_Sequence)
   endif
endwhile