AH500 Programming Manual API 1802 Symbol: S 1 ： Unit address Word S 2 ： Operation frequency of the AC motor drives Word n ： Mode Word 6-400 Instruction code Operand Function REV S , S , n 1 2 The AC motor drive runs counterclockwise. Device X Y M S T C HC D L SM SR E PR K 16# “$” DF S 1 S 2 n Pulse instruction 16-bit instruction (7 steps) 32-bit instruction - AH500 -