Coils
Coils are basic graphic elements of the LD language. A coil is associated to a boolean variable written upon its graphic symbol. A coil performs a change of the associated variable according to the rung state on its left side.
Below are the possible coil symbols and how they change the rung state:
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Symbol |
Beschreibung |
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Normal: the associated variable is forced to the value of the rung state on the left of the coil. |
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Negated: the associated variable is forced to the negation of the rung state on the left of the coil. |
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Set: the associated variable is forced to TRUE if the rung state on the left is TRUE. (no action if the rung state is FALSE) |
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Reset: the associated variable is forced to FALSE if the rung state on the left is TRUE. (no action if the rung state is FALSE) |
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When a contact or a coil is selected. You can press the SPACE bar to change its type (normal, negated, pulse...). |
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Even though coils are commonly connected to a power rail on the right, the rung may be continued after a coil. The rung state is never changed by a coil symbol. |
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Coils |
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IEC 61131-3 Automation platform > Programming - Reference guide > Programming languages - Overview > Ladder Diagram (LD) > Coils |
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