8 Application Instructions API 100-149 API 124 Operands: S : Device for operation source D : Device for operation result Explanations: 1. See the specifications of each model for their range of use. 2. Flags: M1020 (zero flag); M1021 (borrow flag); M1022 (carry flag) 3. e = 2.71828 as the base and S as exponent for EXP operation: EXP ［ D +1, D ］ = ［ S +1, S ］ 4. Both positive and negative values are valid for S . When designating D registers, the data should be 32-bit and the operation should be performed in floating point system. Therefore, S should be converted into a floating 5. The content in D = e S ; e = 2.71828, S = designated source data point value. 6.
If the absolute value of the result ＞ maximum floating point available, the carry flag M1022 = On. 7. If the absolute value of the result ＜ minimum floating point available, the borrow flag M1021 = On. 8. If the result = 0, the zero flag M1020 = On. Program Example: 1. When M0 = On, convert (D1, D0) into binary floating point and store it in register (D11, D10). 2. When M1= On, use (D11, D10) as the exponent for EXP operation and store the binary floating point result in register (D21, D20). 3. When M2 = On, convert the binary floating point (D21, D20) into decimal floating point (D30 Ч 10 [D31] ) and store it in register (D31, D30). M0 M1 M2 Remarks:
For floating point operations, see “5.3 Handling of Numeric Values”. DVP-PLC Application Manual 8-39 Mnemonic Operands Function D EXP P Exponent of Binary Floating Point Type OP Bit Devices Word Devices Program Steps X Y M S K H KnX KnY KnM KnS T C D E F DEXP, DEXPP: 13 steps S * * * D * PULSE 16-bit 32-bit EH3 ES EX SS SA SX SC EH SV EH3 SV2 EH3 ES EX SS S A SX SC EH SV ES EX SS SA SX SC EH SV SV2 SV2 0 RST M1081 DFLT D0 D10 DEXP D10 D20 2 DEBCD D20 D30