Coils

For an introduction to the DSL vocabulary, see Core Concepts.

out — energize output

with Rung(Button):
    out(Light)      # Light = True while rung is True; False when rung is False

with Rung(Button):
    out(Light, oneshot=True)   # True for ONE scan on rung rising edge, then False

out follows rung power: True when rung is True, False when False. Last rung to write a tag wins within a scan.

With oneshot=True, the output is True for only one scan on the rung's rising edge.

latch — set and hold (SET)

with Rung(Start):
    latch(Motor)    # Motor becomes True and stays True until reset

reset — clear latch (RESET)

with Rung(Stop):
    reset(Motor)    # Motor becomes False

Immediate I/O

For InputTag / OutputTag elements (from InputBlock / OutputBlock), .immediate bypasses the scan-cycle image table:

with Rung(SensorA.immediate):
    out(ValveB.immediate)