Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 17)

1.1 What Is a Ladder Program?
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1.1 What Is a Ladder Program?
A ladder program uses ladder instructions and registers to symbolically represent electrical circuits that consist of
switches, timers, lamps, and other devices.
Ladder programming allows you to easily program large, complex circuits.
Each of the ladder programs that you create is executed in a single scan and then executed repeatedly at fixed
intervals.
Switch
Lamp
Ladder Program
Illustration of a Circuit
Timer
Execution is
repeated at a
fixed interval.
Ladder Programming Example