9 Application Instructions API 150-199 API 172 Operands: S 1 : Floating point summand S 2 : Floating point addend D : Sum Explanations: 1. S 1 and S 2 can be floating point values (FX.XX). 2. See the specifications of each model for their range of use. 3. Flags: M1020 (zero flag), M1021 (borrow flag), M1022 (carry flag) 4. In DADDR instruction, floating point values (e.g. F1.2) can be entered directly into S 1 and S 2 or stored in register D for operation. When the instruction is being executed, operand D will store the operation result. 5. When S 1 and S 2 stores the floating point values in register D, their functions are the same as API 120 EADD. 6.
S 1 and S 2 can designate the same register. In this case, if the “continuous execution” type instruction is in use and during the On period of the drive contact, the register will be added once in every scan by a “pulse execution” type instruction (DADDRP). 7. If the absolute value of the operation result is larger than the maximum floating point displayable, the carry flag M1022 will be On. 8. If the absolute value of the operation result is smaller than the minimum floating point displayable, the borrow flag M1021 will be On. 9. If the operation result is “0”, the zero flag M1020 will be On. Program Example 1:
When X0 = On, the floating point F1.20000004768372 will plus F2.20000004768372 and the result F3.40000009536743 will be stored in the data registers (D10, D11). Program Example 2: When X0 = On, the floating point value (D1, D0) + floating point value (D3, D2) and the result will be stored in the registers designated in (D11, D10). X0 DVP-PLC Application Manual 9-81 Mnemonic Operands Function D ADDR P Floating Point Addition Type OP Bit Devices Word Devices Program Steps X Y M S K H KnX KnY KnM KnS T C D E F DADDR, DADDRP:
13 steps S 1 * S 2 * D * PULSE 16-bit 32-bit EH3 ES EX SS SA SX SC EH SV EH3 SV2 ES EX SS EH3 ES EX SS SA SX SC EH SV SA SX SC EH SV SV2 SV2 X 0 DADDR F1.20000004768372 F2.20000004768372 D10 0 DADDR D0 D2 D10