You know, any complex engineering application is composed of some basic programming links, so we must master these basic programming links and some typical basic control designs. Today, this article introduces the basic controls of PLC control systems, including initial control, fault control, power output prohibition control, and multi-condition selection control. So, what are the PLC manufacturers? They offer these features! Let's take a look together!
What are some PLC manufacturers?
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PLC Function:
Initial Control of PLC
Generally, in PLC control, equipment must be initialized before entering the normal control phase. These initialization tasks only run during the initial stage when the PLC is powered on. Once the PLC is operating normally, these initialization programs will no longer execute.
PLC Fault Control
During the operation of PLCs, many unexpected failures may occur. To avoid the severe consequences of these failures, certain methods and means must be employed to ensure the normal operation or shutdown of the PLC. In such situations, conditional termination commands, stop commands, and watchdog reset commands are often used.
3. Prohibit the power output control of PLC
In practical control circuits, emergencies may arise. Upon power restoration, the control environment might still be in the state of the original power source, causing the equipment to resume operation immediately. This could lead to logical errors in equipment operation, and in severe cases, it could result in accidents. To avoid this situation, the power restoration outputs of certain critical equipment are prohibited in the PLC control program.
4. Multi-operation selection for PLC control
In industrial control, a combination of automatic and manual control, along with selection functions, is often required. Of course, more working conditions can be chosen, such as returning to the origin, single-step operation, single-cycle loop, and automatic loop. We can implement this multi-working condition selection function using sequential control, or opt for other programming methods, such as jumps and master commands.
Above are details about what PLC manufacturers offer and their functionalities. For more in-depth information, stay tuned for the next article update.
