plc program
1. Overview of high speed counter21 C235~C255 share PLC high-speed counter 8 high-speed counter inputs X0~X7, an input at the same time can only be used for a high speed counter. 21 counters are 32-bit plus/minus counter (see table 3-7). Different types of counters can be used simultaneously, but their high speed counter input cannot … Continue reading Mitsubishi FX series PLC high-speed counter (HSC)
ith the development of factory automation, micro-PLC control more and more complex and advanced, FX series PLC is equipped with a wide variety of display module and graphics operator terminals as a human-machine interface.1. Display module FX1N – 5DMFX1N – 5DM has 4 keys and a backlit LED display, installed directly on the FX1S, FX1N, … Continue reading FX series PLC display and graphic operating Terminal
The delay has a maximum value of FX series PLC, such as delay greater than the maximum value of the timer can be used more than one timer delay relay.The specific method is:(1) before using a normally open start the next timer timer.(2) counter and timer work.
PLC programming is generally divided into the following steps:1. programming preparationsGetting ready for a program is to understand the whole control system functionality, scale, control, input/output signals of type and quantity, special features of the interface and the relationship with the other device, contents and methods of communication, the entire concept of the control system … Continue reading PLC program 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
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 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) 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
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
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.
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