FBD is a graphically oriented programming language defined in the IEC 61131-3 standard.

Key Characteristics:

• Programs are built using a list of networks

Each network represents:

• A logical or arithmetic expression
• A function block call
• A jump or return instruction

Visual Logic:

• Logic is implemented through connected blocks
• Data flows from input to output through these function blocks

Capabilities:

• Ideal for visualizing signal flow
• Widely used for process automation, PID control, and data manipulation