Siemens PLC integer arithmetic operation instructions - Solutions - Huaqiang Electronic Network

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In STEP 7, you can add, subtract, multiply, and divide arithmetic operations for integers, long integers, and real numbers. The arithmetic operation instructions are performed in accumulators 1 and 2, and the value in accumulator 2 is taken as a subtraction or a dividend. The result of the arithmetic operation is stored in the accumulator 1, and the original value of the accumulator 1 is overwritten by the operation result, and the value in the accumulator 2 remains unchanged.
The CPU does not have to consider the RLO when performing arithmetic operations, and it does not affect the RLO. Learning arithmetic operations instructions must be aware that the result of an arithmetic operation will affect certain bits of the status word: CC1 and CC0, OV, OS. In bit manipulation instructions and conditional jump instructions, these flag bits are often judged to determine what to do.
l +I 16-bit integer addition instruction
l -I 16-bit integer subtraction instruction
l *I 16-bit integer multiplication instruction
l / I 16-bit integer division instruction
l +D 32-bit integer addition instruction
l -D 32-bit integer subtraction instruction
l * D 32-bit integer multiplication instruction
l / D 32-bit integer division instruction
l MOD 32-bit integer division to take the remainder of the instruction example 3.7.1
L MW0 // Load the value in MW 0 into the accumulator 1 low word
L MW2 // Load the value in MW 2 into the low word of accumulator 1 and the original value in the low word of accumulator 1 into the accumulator 2 low word + I // low word in accumulator l low word in accumulator 2 Add together
T MW10 // Send the result to MW 10
* The FBD format differs from the STL statement table instructions in that the enable input EN and the enable output ENO are added. The addition is performed only when I 0.0=1. If the result of the operation is out of range or I 0.0=0, then Q 4.0=0.