8 Application Instructions API 100-149 API 128 Operands: S 1 : Device for base. S 2 : Device for exponent. D : Device for operation result Explanations: 1. See the specifications of each model for their range of use. 2. This instruction performs power multiplication of binary floating point S 1 and S 2 and stores the result in D . D = POW ［ S 1 + 1, S 1 ］ ^ ［ S 2 + 1, S 2 ］ 3. Only positives are valid for the content in S 1 . Both positives and negatives are valid for the content in S 2 . When designating D registers, the data should be 32-bit and the operation should be performed in floating point system. Therefore, S 1 and S 2 should be converted into floating point values. Example:
When S 1 S2 = D , D = ? Assume S 1 = 5, S 2 = 3, D = 5 3 =125 4. If the absolute value of the result ＞ maximum floating point available, the carry flag M1022 = On. 5. If the absolute value of the result ＜ minimum floating point available, the borrow flag M1021 = On. 6. If the result = 0, the zero flag M1020 = On. Program Example: 1. When M0 = On, convert (D1, D0) and (D3, D2) into binary floating points and store them in the 32-bit registers (D11, D10) and (D13, D12). 2. When M1= On, perform POW operation on the binary floting points in 32-bit registers (D11, D10) and (D13, 3.
When M2 = On, convert the binary floating point (D21, D20) into decimal floating point (D30 Ч 10 [D31] ) and store D12) and store the result in the 32-bit register (D21, D20). it in register (D31, D30). M0 M1 M2 DVP-PLC Application Manual 8-44 Mnemonic Operands Function D POW P Floating Point Power Operation Type OP Bit Devices Word Devices Program Steps X Y M S K H KnX KnY KnM KnS T C D E F DPOW, DPOWP: 13 steps S 1 * * * S 2 * * * D * PULSE 16-bit 32-bit EH3 ES EX SS SA SX SC EH SV EH3 SV2 EH3 ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV SV2 SV2 0 RST M1081 DFLT D0 D10 DFLT D2 D12 1 DPOW D10 D12 D20 DEBCD D20 D30