Summary of several languages - programmable logic controller - programmable logic

Using programmable logic controller ( PLC） An important part of the IEC 61131 - 3 is the third part of the international standard programmable logic controller. In this part of this standard, lists the PLC software architecture and efficient programming language. The standard lists five different languages are spoken, of which three are graphical language, the other two are based on the text. Ladder diagram, is often referred to as ladder logic, is one of the main language used in PLC programming.

ladder logic can be used to help engineers and technicians to convert logic for PLC programming. However, when the cascade number gets too much, ladder logic is still difficult to maintain and modify program. Large systems can run on the CPU more subroutine, each subroutine has hundreds of ladder logic steps. On the cascade three internal bit can be used on the ladder further. There are obvious problems and lead to create a more modern language.

function block diagram ( FBD） May is the most widely used in industrial control programming language. It is a graphical language, including system function by accepting system variables and system variables as input and generate control signal as the output of the block. For example, you can use the AND function block, rather than the two XIC instruction in series. This can greatly simplify the programming structure, and to add additional in the level of abstraction. The diagram below shows the schneider electric website of FDB figure.

notice how AND pieces of an input from the final output of the system; In this case, the FBD figure than a collection of ladder logic cascade is easier to read. In addition to the AND AND OR block, the figure also use SR latch, through to delay timer AND instructions type conversion. Functional block diagram is usually looks like a large digital logic diagram. It is important to recognize that although its appearance, function block diagram is broken into the CPU always perform a series of instruction sequence. Instead, digital logic can be combinational logic can also be a logical sequence, and two unrelated logical block always run at the same time and can have a different clock speed.

although function flowchart in order ( SFC） , structured text ( 圣) And instruction sheets ( IL） FBD than common, but they are very valuable in some applications, and used in many industrial systems.

SFC is a graphical language, the chart is broken into a series of steps and transformation. The steps of data and perform I/O operation, whereas conversion ACTS as a control program from one step to another step of conditional statements. SFC is the most effective place of batch processing unit. In batch control, one by one to add ingredients, and then to these components. That it's like cooking, ingredients are stirring, pumping and reaction, rather than mixing, pouring and baking.

ST, for people with programming background, the other two languages look more familiar. ST is PLC controller high-level programming language, like C or BASIC. The code is simple and modular, support the high level of abstraction. When you need a lot of math or data operation, often using ST. Nested if - Else block, circulation and array are usually too cumbersome to be graphically programming.

IL is basically PLC controller assembly code. It USES a simplified set of instructions, but has a familiar commands, such as loading, storage, and jump. Although IL is very efficient, but it has been IEC deprecated, and are unlikely to PLC to implement in the future.

Shenzhen Coolmay Technology Co., Ltd. as one who also teaches operations about how we use our whole operating system as a way to gain advantage and create considerable value and capture value in a sector where, in essence, the environment is quite hostile from a competitive point of view.
And finally, if you want to find additional resources for plc manufacturers, simply go to Coolmay PLC for more.
We began investing in our workforce and negotiated deals with major suppliers and providers to lower the cost of equipment so the technicians could enhance the competitiveness of plc manufacturers right away.
By building an connection around Coolmay and catering specifically to the craft beer crowd, Shenzhen Coolmay Technology Co., Ltd. was able to raise the capital and brand awareness needed to successfully break into the domestic market with a groundswell of support.
Provide plc manufacturers strategists with enough funds to adequately market our company and the products and services it provides.