plc program
Programmable controllers (Programmable Controller) should be referred to as PC, PC PC in order to distinguish, so referred to as programmable controller PLC (Programmable Logic Controller), but does not mean that PLC can control logic signal. Application and design of PLC is specifically designed for industrial environments, comes with an intuitive, simple and easy to … Continue reading PLC, the structure and principles of learning
1: according to actual needs, function block programming, writing subroutinesIn the PLC, subroutines are relatively independent of a specific control objective to develop the program. CALL subroutine call instruction is executed, if the subroutine call if the conditions are not met, the program scans only in the main program, and not to scan the routine, … Continue reading How to improve the speed of PLC program running
Question: I use two 1KF02 analog input module, provided separately for modules 1 and 2. Module configuration:Module 1, the first four-channel configuration for current signals, four channel configuration for RTD Pt100; first six channel module 2 configuration for RTD Pt100, two vacant channel, STEP7 will disable it. Current signals by two-wire connection, PT100 wire connection, … Continue reading Output value of the analog input module in the normal reasons for beating with 32767
DCS distributed control systems (Distributed Control System), short for domestic General called the distributed control system. It is a process control level and process monitoring levels of communication networks-a link to the multiple computer systems, integrated computer (Computer), communications (Communication), display (CRT) and a control (Control) 4 c technology, the basic idea is decentralized, centralized … Continue reading What is DCS control system
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
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
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
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
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
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
PLC ONE 