需求
“Create a farm gate relay ladder with open and close buttons, open and close limit switches, interlocked open and close commands, and a five-second automatic close timer.”
接著試試Change the close timer to 20 seconds.Add a safety beam to the close rung.
這張圖裡有什麼
看懂背後的決策。
01
Use of parallel branches to implement seal-in logic for sustained open/close commands, with XIO contacts to drop out at limit switches.
02
Incorporation of a TON timer block activated by the open limit switch to generate an automatic closing signal after a preset delay.
03
Mutual interlocking via XIO of opposite command to prevent motor conflict and ensure safe operation.
Reusable for any bidirectional motor control with momentary pushbuttons, end-of-travel limit switches, and a timed automatic return feature. Typical in gates, garage doors, or conveyor diverters.