Chapter 6 0BApplied Instructions 6.1.2 Explanation of Comparison Instructions Symbol: S 1 ： Data source 1 Word / Double word Taking LD= and DLD= for example S 2 ： Data source 2 Word / Double word Explanation: 1. The instructions are used to compare the value in S 1 with that in S 2 . Take the instruction LD= for example. When the comparison result is that the value in S 1 is equal to that in S 2 , the condition of the instruction is met. When the comparison result is that the value in S 1 is not equal to that in S 2 , the condition of the instruction is not met. 2. Only the 32-bit instruction can use the 32-bit counter. Example: 1. When the value in C10 is equal to 200, Y0.10 is ON. 2.
When the value in D200 is greater than -30, Y0.11 keeps ON. 3. When the value in (C201, C200) is less than 678,493, or when M3 is ON, M50 is ON.
6-6 API Instruction code Operand Function 0000~ 0005 D LD※ S , S 1 2 Comparing the values Device X Y M S T C HC D L SM SR E PR K 16# “$” DF S 1 S 2 Pulse instruction 16-bit instruction (5 steps) 32-bit instruction (5 steps) － AH500 AH500 API 16-bit 32-bit Comparison operation result number instruction instruction ON OFF 0000 LD＝ DLD＝ S ＝S 1 2 S ≠S 1 2 0001 LD＜＞ DLD＜＞ S ≠S 1 2 S ＝S 1 2 0002 LD＞ DLD＞ S ＞S 1 2 S ≦S 1 2 0003 LD＞＝ DLD＞＝ S ≧S 1 2 S ＜S 1 2 0004 LD＜ DLD＜ S ＜S 1 2 S ≧S 1 2 0005 LD＜＝ DLD＜＝ S ≦S 1 2 S ＞S 1 2