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Introduction to IEC 61131-3 programming

Programming languages

DDS-IEC61131 EN 2.0

5.4 Function Block Diagram (FBD)

(Function Block Diagram, FBD)

Function Block Diagram is a graphically oriented programming language.

It works with a list of networks. Each network has a structure which represents a logic or arithmetics,

a function block request, jump or a return instruction. Function block outputs are connected with

inputs of following function blocks. Jumps facilitate programming.

Based on defined function blocks, the Function Block Diagram enables the user to implement any

program sequence by means of connection elements. Furthermore, the schematic representation

of the data flow helps to understand program sequences.

As known from the 9300 Servo PLC and Drive PLC, many hardware components are offered with

the corresponding function blocks. That means that there are corresponding modules for both

levels, hardware and software.

Fig. 4 Example of a network in FBD

5.5 Ladder Diagram (LD)

(Ladder Diagram, LD)

Ladder Diagram is a graphically oriented programming language, similar to the principle of an

electric circuit.

On the one hand, Ladder Diagrams are used to build up logic circuits, on the other hand, they can

also be used to create networks (like in FBD). Thus, the Ladder Diagram is perfectly suitable to

control the request of organization units.

Ladder Diagrams consist of several networks.

A network is limited by vertical current leads on both ends. In between, there is a circuit diagram

consisting of contacts, coils and connection lines which transmit the status ”ON” and ”OFF” from

left to right (TRUE or FALSE):

Fig. 5 Example of a network in LD

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Lenze DDS v2.0 Manuel d'utilisateur Page 18