1. hardware design of PLCPLC hardware includes: PLC and peripheral circuit design, circuit design and the design of anti-interference measures.Selected models and distribution of PLC I/O points, hardware design of electrical control system of main content is the schematic design, design of electrical control components are selected and control cabinets. Schematic diagram of the electrical … Continue reading PLC main contents and requirements for hardware and software design
Tag: plc tutorial
PLC software design and design examples
A translation methodTranslation method was quite soft in the selected models of PLC devices, instead of the original schematic diagram of relay-contactor control circuit devices will translate relay-contactor control circuit of the PLC ladder program.1. Design procedure2. Design exampleFigure 1 is a translation of the original relay-contactor control circuit using PLC control schematics and ladder … Continue reading PLC software design and design examples
Representation of the PLC function instruction
Representation of the function instructionThe expression takes the following form:Figure 1 command basic forms(1) [s.] is called the source operand, its content does not change with instructions, in the case of index can be used to modify the soft components, using the "." symbol [s.] said the number of sources for a long time, [S1.][S2.] … Continue reading Representation of the PLC function instruction
PLC programming language of IEC standard IEC61131-3
PLC programming language of IEC standard (IEC61131-3) 5 programming language:1) sequential function chart (Sequential function chart);2) ladder (Ladder Diagram);3), function block diagram (Function block diagram);4) list of instructions (Instruction list);5) structured text (Structured text).Sequential function chart (SFC), ladder diagram (LD), function block diagram (FBD) is a graphical programming language, instruction list (IL), and structured text … Continue reading PLC programming language of IEC standard IEC61131-3
Step instructions and step ladder diagram examples
A, step instructions(1) the STL: step-start instructions(2) RET: step return instructionsSecond, step ladderFigure 1 shows the State transition diagram as shown in Figure 2 can be converted into a step ladderFigure 1Step ladder instruction has the following characteristics:(1) transfer for automatic reset function(2) allows dual output(3) the main control functions
What is a PLC State transfer diagram
State transition diagram and function chart, it is the State of elements are used to describe the process flow diagram. It is usually composed of the initial state, a series of General State, transfer lines and transfer conditions. Each State provides three functions: drive for loading, specifying conditions of transfer and specify the transfer destination.
Delay connect/disconnect circuit of PLC ladder diagram
Delay connect/disconnect circuit
Architecture and programming method of PLC
I. structure of the programmable controller1. structure of the PLC include most of the hardware and software. Three-ring between the hardware and control objects:2. first part: is the operating system, using it to manage hardware resources PLC;3. the second ring: is the build system, which had two rings of PLC software system.4. the third ring: … Continue reading Architecture and programming method of PLC
Delay timer and counter combination of PLC program of ladder diagram
Use a combination of timer and counter the cascade could be expanded delay time, as shown in Figure 5-13. T4 in Figure form a reset timer of the 20s, when X4 connected, T4 coils connected and start delay 20s T4 normally closed contacts disconnect the T4 Timer coil disconnect and reset until the next scan, … Continue reading Delay timer and counter combination of PLC program of ladder diagram
Counters for extended PLC program of ladder diagram
As long as you provide a clock signal as a counter counting input signal, counter can achieve timing function, clock signal multiplied by the cycle counter value is time. Clock signal can be generated by the PLC internal special relay (such as the FX series PLC, M8011, M8012, M8013 and M8014), can also be generated … Continue reading Counters for extended PLC program of ladder diagram
PLC ONE 