Chapter 4 Instruction Structure operands. Every applied instruction has its own API number and instruction code. For example, the instruction code of API0300 is MOV (transferring the data). Entering the instruction directly: Users can enter the instruction by means of ISPSoft. For the instruction MOV, users only need to enter the instruction name and the operands to designate “MOV D0 D1”. Entering the instruction by dragging: Users can drag the instruction MOV from APIs in ISPSoft to the area where the ladder diagram can be edited. Entering the instruction by the toolbar: Users can click API/FB Selection on the toolbar in ISPSoft, and then choose API .
Finally, they can choose the instruction MOV in Data Transfer . The operands are extra designated. The length of the operand (the 16-bit instruction, the 32-bit instruction, or the floating-point number instruction): The 16-bit instruction or the 32-bit instruction The values of the operands can be divided into the 16-bit values and the 32-bit values. Accordingly, in order to process data of difference lengths, the instructions are divided into the 16-bit instructions and the 32-bit instructions. To separate the 32-bit instruction from the 16-bit one, a D is added in front of the 16-bit instruction. 16-bit instruction MOV When M1 is ON, the data in D0 is transferred to D1.
32-bit instruction DMOV When M1 is ON, the data in (D1, D0) is transferred to (D3, D2). The floating-point number instruction The floating-point number instructions can be divided into the 32-bit floating-point number instructions and the 64-bit floating-point number instructions, which correspond to the single-precision floating-point number instructions and the double-precision floating-point number instructions respectively. Users can refer to chapter 2 for more information about the floating-point numbers. 4-3 S Source operand If there is more than one source operand, these source operands are represented by S , 1 S , and etc.
2 D Destination operand If there is more than one destination operand, these destination operand is represented by D , D , and etc. 1 2 If the operand only can designate the constant K/H or the register, it is represented by m, m , m , 1 2 n, n , or n . 1 2