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Instructions, manuals and examples stay separated by product family, so an FX5 command is never presented as a Q, L or iQ-R instruction without verification.

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GX Works3 Instruction Finder

Search 844+ FX5 manual-indexed instructions and functions. Detailed practical guides are included for commonly used ladder instructions.

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LD

Start a logic block with a normally-open condition.

SyntaxLD source

Ladder instruction example

LD X0
OUT Y0
Devices

Bit device or comparison result

Practical note

Use AND/ANI for following series conditions.

Common mistake: Using LD mid-rung starts a new logic block.

Source: MELSEC iQ-F FX5 Programming Manual (Instructions, Standard Functions/Function Blocks). Confirm exact operands for your CPU and firmware.

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