Chapter 6 Applied Instructions Symbol: S ： Data source Double word D ： Conversion result Double word Explanation: 1. The decimal floating-point number in the register specified by S is converted into the single-precision floating-point number, and the conversion result is stored in the register specified by D . 2. Suppose the value in S is 1234, and the value in S +1 is 3. The value in S is converted into 1.234x10 6 . 3. The value in D should be a single-precision floating-point number, and the values in S and S +1 represent the decimal real number and the decimal exponent respectively. 4.
The instruction FBIN is used to convert the decimal floating-point number into the single-precision floating-point number. 5. The real number of decimal floating-point numbers range from -9,999 to +9,999, the exponents of decimal floating-point numbers range from -41 to +35, and the practical range of decimal floating-point numbers in PLC is between ±1175Ч10-41 and ±3402Ч10+35. When the operation result is zero, SM600 is ON. Example 1: When X0.0 is ON, the decimal floating-point number in the register in (D1, D0) is converted into the single-precision floating-point number, and the conversion result is stored in (D3, D2).
Decimal floating-point number Exponent Real number Mathematical form [D0] 10 X [D1] Binary floating-point number Real number: 23 bits; Exponent: 8 bits; sign: 1 bit Example 2: 1. Before the floating-point operation is performed, users have to use the instruction FLT to convert the binary integer into the single-precision floating-point number. The premise of the 6-95 API Instruction code Operand Function 0213 FBIN P S, D Converting the decimal floating-point number into the binary floating-point number Device X Y M S T C HC D L SM SR E PR K 16# “$” DF S D Pulse instruction 32-bit instruction (5 steps) 64-bit instruction AH500 AH500 - D 1 D 0 D 3 D 2