Attention
IronPLC can only run very simple programs. The steps described are accurate but many language features are not yet supported.
Rungs¶
A rung is a horizontal logic line in a ladder diagram, connecting a left power rail to a right power rail. Each rung represents a single logic path containing contacts, coils, and function block invocations.
IEC 61131-3 |
Section 3.2 |
Support |
Not yet supported |
Description¶
Power flows from the left rail through a series of contacts. If all contacts in the path evaluate to TRUE, power reaches the right rail and activates the coil.
| start_button motor_output |
|---| |---+---( )---|
| |
| hold |
|---| |---+
| |
Each rung is evaluated once per scan cycle.