Relay Ladder; Structured Text - Allen-Bradley Logix5000 Reference Manual

Chapter 11 Program Control Instructions (JMP, LBL, JSR, RET, SBR, JXR, TND, MCR, UID, UIE, AFI, NOP, EOT, SFP, SFR, EVENT)
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Example:
You can use the TND instruction when debugging or troubleshooting to execute
logic up to a certain point. Progressively move the TND instruction through the
logic as you debug each new section.
When the TND instruction is enabled, the controller stops scanning the current
routine.

Relay Ladder

Structured Text

TND();
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011