Chapter 6 Applied Instructions 6.2.2 Explanation of Arithmetic Instructions Symbol: S 1 ： Augend Word/Double word S 2 ： Addend Word/Double word D ： Sum Word/Double word Explanation: 1. The binary value in S 2 is added to the binary value in S 1 , and the sum is stored in D . 2. Only the 32-bit instructions can use the 32-bit counter. 3. The Flags: SM600 (zero flag), SM601 (borrow flag), and SM602 (carry flag) 4. When the operation result is zero, SM600 is ON. Otherwise, it is OFF. 5. The addition of 16-bit binary values: When the operation result exceeds the range of 16-bit binary values, SM602 is ON. Otherwise, it is OFF. 6. The addition of 32-bit binary values:
When the operation result exceeds the range of 32-bit binary values, SM602 is ON. Otherwise, it is OFF. Example 1: The addition of 16-bit binary values: When X0.0 is ON, the addend in D10 is added to the augend in D0, and sum is stored in D20. When the values in D0 and D10 are 100 and 10 respectively, D0 plus D10 equals 110, and 110 is stored in D20. When the values in D0 and D10 are 16#7FFF and 16#1 respectively, D0 plus D10 equals 16#8000, and 16#8000 is stored in D20.
6-37 API Instruction code Operand Function 0100 D + P S , S , D 1 2 Addition of binary numbers Device X Y M S T C HC D L SM SR E PR K 16# “$” DF S 1 S 2 D Pulse instruction 16-bit instruction (7 steps) 32-bit instruction 7 steps) AH500 AH500 AH500