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en:automation:02-glossary:iec61131-3-hidden [2018/07/23 09:13] mkudlacek |
en:automation:02-glossary:iec61131-3-hidden [2021/07/12 07:44] (current) avsetula [Programming methods of IEC 61131-3] |
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| - | ~~NOTOC~~ | + | ====== Programming methods of IEC 61131-3 ====== |
| - | ======%hide IEC61131-3 ====== | + | |
| - | ====== Programming methods of IEC61131-3 ====== | + | |
| The IEC61131-3 standard defines 5 programming methods for PLCs: | The IEC61131-3 standard defines 5 programming methods for PLCs: | ||
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| * Ladder diagrem (LD) | * Ladder diagrem (LD) | ||
| * Functional block diagram (FBD) | * Functional block diagram (FBD) | ||
| - | * Structured text (ST) | + | * Structured text (ST) |
| * Instruction list (IL) | * Instruction list (IL) | ||
| - | * Sequential function chart (SFC) | + | * Sequential function chart (SFC) |
| ===== Functional block diagram (FBD) ===== | ===== Functional block diagram (FBD) ===== | ||
| - | Function Block diagram is a programming method, which allows easy graphical programming via pre-programmed function blocks. Those blocks are to be interconnected with other blocks or input / output variables. Each function block describes the relation between the input and output variable. It is possible to either import FB or make your own. | + | FBD (or FUPLA) is a programming language based on predefined blocks of code. Each block has its specific function and its inputs (temperature value, switch signal) and outputs (switch command, regulation etc.). The control logic itself is then created in a clear graphic interface simply by connecting the blocks and variables. Mervis IDE features a large library of default function blocks covering an absolute most of all basic PLC operations, such as mathematical functions (sum, multiplication, comparison), control loops (hysteresis, three-way valves), counters, time schedulers and much more. You can also create more complex blocks by connecting several other blocks. **FBD is thus suitable for users without any deeper programming knowledge**. |
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| + | {{ :en:automation:02-glossary:fbd.png?nolink |}} | ||
| ===== Structured text (ST) ===== | ===== Structured text (ST) ===== | ||
| + | The ST language is based on a structured text able to express complex functions by only a handful of lines of text code. **The ST is useful mainly for experienced users** and programming extensive complex projects. ST can be also used to create custom function blocks if needed. | ||
| + | {{ :en:automation:02-glossary:st.png?nolink |}} | ||
