1. The General steps for PLC programming (1) if the PLC with program, should learn more about the program features and level of satisfaction of needs and modifiability. Using PLC comes with program as far as possible.(2) all PLC related to the input signal (button, switch, speed, and temperature sensor), the output signal (contactors, solenoid valves, … Continue reading The steps and principles of PLC programming summary
PLC flow chart of sequential control design method
According to the functional flowchart, to step in as the core, from the start step by step by step design until completion. The key to this method is a diagram drawing function. First State of the output is used to control the work process consists of several steps, conversion between the step and pointed out … Continue reading PLC flow chart of sequential control design method
PLC main contents and requirements for hardware and software design
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
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
Design of PLC control system and debug steps
(A) analysis of controlled objects control requirements andDetailed analysis of control processes and characteristics about control of interaction between mechanical, electrical, fluid, made the control requires control of PLC control system, identification of programmes, development proposal.(B) determine the input/output devicesAccording to the system requirements, and determine all of the required input devices (such as push … Continue reading Design of PLC control system and debug steps
Design of PLC control system of the four cardinal principles
1 meet control requirements of the controlled object.2 in the premise of meeting the requirements to make simple, affordable, easy to use and maintenance of control system.3 ensure that the control system is safe and reliable.4 taking into account the development of the production and improvement of technology in select PLC capacity should be appropriate … Continue reading Design of PLC control system of the four cardinal principles
PLC control system design of the basic principles and main contents
1. design principles In order to achieve controlled technology to improve production efficiency and product quality. 1. selection of PLC should not only meet the requirements of specification, you should also focus on technical support and after-sales service of the company's products. (Choose product) 2. to meet the control requirements of the controlled object. 3. meet the requirements of … Continue reading PLC control system design of the basic principles and main contents
Ladder diagram programming principle and PLC programming method
(1) input/output relays, auxiliary relays, timers, counters, the contacts of the device can be used repeatedly without complex programs to reduce the number of contacts.(2) the ladder each row from left buses start coil terminate in the right bus. Contacts should not be placed right of the coil(3) in addition to stepping outside of any … Continue reading Ladder diagram programming principle and PLC programming method
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
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