CTUD |
IEC / CEI 1131-3 Compliant
This device represents an UP/DOWN programmable counter. A rising-edge on the CU ( COUNT-UP) input will increment the counter by one while a rising-edge on the CD ( COUNT-DOWN ) decreases the current value.
Applying a TRUE signal on R input will reset the counter to zero. A TRUE condition on the LD signal will load the counter with the value applied to the input PV ( PROGRAMMED VALUE ) .
QU output becomes active when the current counting value is greater or equal to the programmed value. The QD output becomes active when the current value is less or equal to zero.
The CV output reports the current counter value.
As specified in the IEC / CEI 1131-3 standard this kind of counter has a counting range espressed by an integer 16 bit variable. This means that this counter can span from -32768 to +32767 .
Net plugs
Plug |
Description |
CD |
A rising-edge on this input will decrement the counter by one |
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CU |
A rising-edge on this input will increment the counter by one |
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R |
Applying a TRUE signal on this input will reset the counter |
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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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QU |
This output become TRUE when the counting is equal or greater than the programmed value |
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QD |
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, CTD, CTU, IDENT, CONST