The PLC control circuit for the cement mixer is shown in the figure. This article only presents the control circuit diagram and ladder diagram of the PLC. The main circuit controls the operation of the water pump, material pump, and mixing pump with overload protection through a variable frequency drive. The water pump is a … Read more
01 Start-Stop Control Circuit Control Requirement: Press the start button (I0.0 is ON), Q0.0 is ON; press the stop button (I0.1 is OFF), Q0.0 is OFF. The ladder diagram is shown in Figure 1. Figure 1: Start Priority 02 Interlocking Control Circuit In the interlocking circuit shown in Figure 2, I0.0 and I0.1 are the … Read more
01 Start, Self-locking, and Stop Control PLC Circuit and Ladder Diagram Start, self-locking, and stop control are the most basic control functions of PLC. These can be implemented using output instructions (OUT) or set/reset instructions (SET, RST). 1. Using Coil Drive Instructions for Start, Self-locking, and Stop Control The coil drive (OUT) instruction functions to … Read more
The programming language for PLC software has distinct characteristics compared to general computer languages. It is neither a high-level language nor a typical assembly language, and it must meet the requirements for ease of writing and debugging. Early PLCs supported only ladder diagram programming language and instruction list programming language. According to the International Electrotechnical … Read more
1. Start-Stop Control Circuit Control requirements: Press the start button (I0.0 is ON), Q0.0 is ON; Press the stop button (I0.1 is OFF), Q0.0 is OFF. The ladder diagram is shown in Figure 1. Figure 1 Start Priority 2. Interlock Control Circuit In the interlock circuit shown in Figure 2, I0.0 and I0.1 are the … Read more