Analysis and Application of FOR Loop Statement

F loop statements are widely used and are used in programming. Being able to read these program statements can help you better understand the control principles of electromechanical equipment and bring convenience to the installation of electromechanical equipment.

1. Program Application

The following figure controls the three-phase coil windings to connect and disconnect in sequence by programming the 1st to 6th tubes, generating a rotating magnetic field to drive the motor to rotate. It is difficult for people without programming knowledge to understand the frequency conversion circuit, so it is very important to be able to read the program.

2. FOR statement in robot

In robot language programming, FOR and ENDFOR appear in pairs. FOR indicates the start of a loop, the value specified by FOR indicates the number of loops, and ENDFOR indicates the end of the loop.

1. Grammatical structure

2. Classic Program

3. FOR instruction

1. Classic Program

The execution process of PLC program is divided into 3 steps: 1. Input; 2. Program scanning; 3. Output refresh. In one working cycle, some program segments need to be executed multiple times. At this time, FOR instruction can be used. FOR and NEXT are used in pairs.

3. for statement in C language

1. Sentence structure

Expression 1 assigns an initial value to the loop variable; Boolean expression 2 is the loop condition; expression 3 modifies the value of the loop variable.

2. Classic Program