Voltage output transmitters have constant voltage source characteristics and high input impedance. If the transmitter is far away from the PLC, the interference signal current generated by the distributed capacitance and distributed inductance between the lines will generate a high interference voltage on the input impedance of the module. For example, a 1μA interference current will generate a 10V interference voltage signal on a 10MQ input impedance, so the anti-interference ability is very poor when transmitting analog voltage signals at a distance.
Characteristics of analog closed-loop control system-PID control:
It does not require a mathematical model of the controlled object, has a simple structure, is easy to implement, is easy to use, and has strong flexibility and adaptability.
Tuning PID controller using debug window - debug window functions:
1. Use the "First Startup Self-Tuning" function to optimize the controller
2. Use the "self-adjustment during operation" function to optimize the controller to achieve the best adjustment
3. Used for trend view to monitor current closed-loop control
4. Test the process by manually setting the controller output value
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Recommended ReadingLatest update time:2024-11-16 09:23
Why does the Siemens PLC analog input module receive unstable values with large fluctuations?
Possible causes are as follows:
1. The analog input module and the field sensor may use self-powered or isolated power supplies respectively, and the two power supplies are not connected to each other, that is, the power supply of the analog input module and the signal ground of the field sensor are not connect
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How to read the program of Mitsubishi FX series PLC
Mitsubishi FX series PLC (Programmable Logic Controller) is a control device widely used in the field of industrial automation. They have powerful functions and flexible programming methods, which can meet various industrial automation needs. This article will introduce in detail how to read the program of Mitsubish
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Siemens MindSphere is accelerating the development and deployment of IIoT solutions
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Explanation of the PLC controlled motor forward and reverse circuit
The circuit diagram is as follows:
The ladder diagram and instruction statement table are as follows:
The PLC
control instruction statement table is as follows:
Input/output devices and I/O configuration are as follows:
Forward start is as follows:
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PID Control Adjustment of S7-300 2
1.PID library instruction——FB41
First, find Standard Library—PIC control Blocks—FB41 in the software.
2. Meaning of each pin of FB41:
COM_RST: switch value, 1 means restarting PID and resetting PID internal parameters.
MAN_ON: 1 for manual, 0 for automatic.
P_SEL: Proportional se
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The difference between PLC and relay contactor control
Basic knowledge of PLC
Programmable logic controller uses a type of programmable memory to store programs internally, execute user-oriented instructions such as logic operations, sequential control, timing, counting and arithmetic operations, and control various types of machinery or production processes throug
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Working principle of PLC in motion control of switch quantity processing
Since the introduction of the Programmable Logic Controller (PLC) in the United States in the 1960s to replace traditional relay control devices, PLC has developed rapidly and has been widely used around the world. At the same time, the functions of PLC have been continuously improved. With the continuous developmen
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