CTD
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CTD
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IEC / CEI 1131-3 Compliant
The CTD object represents a DOWN COUNTER. A rising-edge on CD input will decrement the counting by one. The Q output become TRUE when the current counting value is equal or less than zero. Applying a TRUE signal on LD (LOAD) input will load the counter with the value present at input PV ( Asyncronous load ).
The CV output pin reports the current counting value.
Net plugs
Plug |
Description |
CD |
A rising-edge on this input will decrement the counter by one |
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LD |
Applying a TRUE signal on this input will load the counter with the value present at input PV |
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PV |
When the LD pin is asserted, the value applied to this pin will be loaded as current count value. User should use a CONST or IDENT object to enter numerical constant |
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Q |
This output become TRUE when the counting is less or equal than zero |
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CV |
This output reports the current counting value |
See also : COUNTER , CTU , CTUD , IDENT , CONST