1, converts analog values into the values of quantities:Parameter conversion:OUT = [((FLOAT (IN) – K1)/ (K2–K1)) * (HI_LIM–LO_LIM)] + LO_LINote:If user input/output type dual-polarity (± 10V, 5V), K1=-27648,K2=27648, or K1=0,K2=27648.For example: suppose the analog module the sensor type 0-20mA to measure object temperature, when temperature is 0 c current 0 mA, when temperature is 100 … Continue reading Analog conversion between values and the value of quantities
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Five stage of the learn PLC
I personally think that the PLC will go through 5 stages. Read the content below, please ask yourself is which form!I. logical phasesCalled the logical phase is to implement the General logic of relay system design, since it is a relay system of electric drive knowledge is the basis for the stage. My personal summary … Continue reading Five stage of the learn PLC
Analog conversion method
1, basic conceptsWe are living in a material world. All substances contain chemical and physical properties, we are the apparent nature of the material to understand and own property of matter and motion characteristics. These apparent nature is what we used to say mass, temperature, velocity, pressure, voltage, current, the physical quantities expressed in mathematical … Continue reading Analog conversion method
PLC battery replacement when the best
When PLC program to keep in RAM when used batteries, the battery usually 3V or 3.6V non-rechargeable lithium-ion battery, battery life is usually about five years or so, the battery is used for a long time, the voltage will drop, when it dropped to less than to ensure that the data in RAM, the program … Continue reading PLC battery replacement when the best
What is PID dead zone
Dead zone: also known as dead-zone width, control systems, some executing agencies if the action frequently, can result in slight shock, resulting in severe mechanical wear. From the control requirements, many systems also allow the controlled errors exist in a certain range. We allow the controlled size, width of dead zone known as PID;Dead-how does … Continue reading What is PID dead zone
what is kind of External circuit of the PLC input form
PLC forms enter the external circuit of the external node is divided into the following three types:Passive node 1, input, namely: enter the switch node 2, NPN and PNP input3, diode input
Siemens programmed software and program structure
1. Programming softwareSiemens SIMATIC PLC series offers a variety of programming software, mainly STEP MICRO/DOS and STEP MICRO/WIN;STEP mini standard package STEP7S7 PLC programming language is very rich, includes LAD, and STL, SCL, GRAPH, HIGRAPH, CFC etc. Users can select a language, if required, can also be mixed using several programming languages.2. Program structureProgram structure … Continue reading Siemens programmed software and program structure
PLC: which hardware and software components
Programmable logic controller consists of CPU, memory, I/O interface circuits, peripheral interface, programming devices, power supplies and other components.
What needs attention in PLC application
1. Work environment(1) temperaturePLC required ambient temperature 0~55oC, installation cannot be placed in the heat element below, should be big enough ventilation space around.(2) climateIn order to ensure the insulation performance of PLC, the relative humidity of air should be less than 85% (no condensation).(3) motionPLC should be away from strong vibration source to prevent … Continue reading What needs attention in PLC application
What is a PLC automatic control system
In the 1960 of the 20th century United States introduction of programmable logic controllers (Programmable Logic Controller,PLC) instead of the traditional relay control device since the PLC have been developing rapidly, has been widely used all over the world. Meanwhile, PLC functionality has been improved. With computer technology, signal processing, control network technology and user … Continue reading What is a PLC automatic control system
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