(1) Heating elements: Provide heating elements such as heaters and heating wires for PLC equipment to keep the PLC within a suitable operating temperature range. These heating elements can be selected according to the required temperature and power, and monitored and controlled by sensors or temperature controllers.
(2) Insulation materials: Use insulation materials to isolate the PLC to prevent it from being affected by external low temperatures. This can include using insulation boxes, insulation covers or insulation pads to provide additional insulation and reduce the possibility of the PLC being affected by low temperatures.
(3) Sealing design: Ensure that the PLC device housing has good sealing to prevent cold air from entering the PLC device. This can be achieved by using materials such as sealants, rubber gaskets or sealing strips.
(4) Temperature control system: Install temperature sensors and temperature controllers to monitor the temperature around the PLC in real time and automatically adjust the power of the heating elements. When the temperature is too low, the control system will automatically start the heating elements to provide appropriate insulation effect.
(5) Reliable power supply: Provide a reliable power supply for the PLC to ensure that it can continue to work normally in a low-temperature environment. A backup power supply, UPS (uninterruptible power supply) or other stable power supply equipment can be used to prevent the impact of voltage fluctuations and power failures on the PLC.
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What are the five languages that support PLC programming?
Compared with general computer languages, the software programming language of PLC has obvious characteristics. It is different from high-level languages and general assembly languages, and must meet the requirements of easy writing and debugging. Early PLCs only supported ladder diagram programming languages an
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Basic knowledge points of PLC programming
Calculation of switch quantity
Switching quantity, also known as logic quantity, has only two values, 0 or 1, ON or OFF. It is the most commonly used control. Controlling it is the advantage of PLC and also the most basic application of PLC.
The purpose of switch quantity control is to make the PLC g
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Programming control case based on Siemens S7-1200PLC
1. Action Description
1. We built a simple conveyor belt on the simulation software and configured a control panel;
2. Through the mode selection switch, you can choose automatic/manual mode;
3. Press the automatic start button in automatic mode to introduce the conveyor belt into au
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Main anti-interference measures for PLC controller
Measure 1: Use a power supply with excellent performance to suppress interference introduced by the power grid.
For the power supply of PLC controller, non-power line power supply should be adopted, and the power supply should be directly supplied from the main bus of low-voltage distribution room by dedi
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How to wire a relay to a PLC?
Generally speaking, factory equipment basically considers the relay output points. The service life of relays is limited. After using for a period of time, they may break down. In this case, you can switch to the spare point and adjust the program appropriately.
1. PLC was a small computer with some t
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What are the main sources of electromagnetic interference in PLC control systems?
1. Overview
With the development of science and technology, PLC is increasingly used in industrial control. The reliability of PLC control systems directly affects the safe production and economic operation of industrial enterprises, and the anti-interference ability of the system is the key to the reliable ope
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PLC motor forward and reverse control circuit diagram ladder diagram program
When learning PLC, the application of edge instructions is indispensable, which brings us a lot of convenience in programming. Today, we will introduce a case to directly and reliably switch the motor forward and reverse program.
We know that the most important issue in the motor forward and reverse contr
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Mitsubishi PLC programming instructions
Mitsubishi PLC (Programmable Logic Controller) is a control device widely used in the field of industrial automation. It controls various mechanical equipment through programming and has the characteristics of high flexibility and high reliability. The following is an introduction to Mitsubishi PLC programming instr
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Siemens PLC Programming Technology and Application Cases (Edited by Liu Zhenquan, Wang Hanzhi, Yang Kun, etc.)
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