"S7-200 programs, there are those that do not can be used? I did a lot of subroutines, subroutine repeatedly calls without any problems, but there is a subroutine is invoked, each loop inside the first command that calls the subroutine works, while the second call is null and void. If this subroutine and then recopy … Continue reading S7-200 programs instructions cannot be used
Tag: plc training
PLC sequential control design method
Sequential control design method is the basic idea of the system connected to the order of a working cycle is divided into several stages, these stages are known as step (Step). Sequential function chart (SFC) is mainly composed of steps, to the connections, transformations, transitions, conditions and actions.Figure 1 is a diagram on how to … Continue reading PLC sequential control design method
Introduction to PLC programming
Early programmable logic controller referred to as programmable logic controllers (Programmable Logic Controller,PLC), it is mainly used to replace relay logic control. With the development of technology, which uses microcomputer technology of industrial control equipment is already far exceeds the scope of logic control, therefore, such devices are called programmable controller, referred to as PC. … Continue reading Introduction to PLC programming
PLC, the structure and principles of learning
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
How to improve the speed of PLC program running
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
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
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.
PLC program debugging
After the PLC program debugging through can only to users, or try to run. Field debugging to debug outline prepared in advance. According to the outline, step by step in an orderly manner.When you start debugging, the device may not work, not even charged. Progress step by step power available with debug, boot, loading, running … Continue reading PLC program debugging
PLC Basic programming steps
To write a PLC program can be carried out according to the following steps:1. Process analysisPLC control object work and control requirements are analyzed, to clarify the following questions:1) how to start the process? The goal is how to further implement?2) correspond to how input and output? On the timing and what are the characteristics?3) … Continue reading PLC Basic programming steps
PLC ONE 