运营商：SHL IEC 运算符用于将操作数向左按位移位。 erg := SHL (in, n [...] PROGRAM shl_st VAR in

_ELSE 移位运算符 SHL SHR ROL

]; dwHelp := SHL(dw [...] ]; dwHelp := SHL(dw [...] ]; dwHelp := SHL(dw