Programming options
5.3 Powerful and easy-to-use instruction set
Easy Book
62 Manual, 05/2009, A5E02486774-01
The CTU counts up by 1 when the value of parameter CU changes from 0 to 1. The figure
shows a CTU timing diagram with an unsigned integer count value (where PV = 3).
• If the value of parameter CV (Current
count value) is greater than or equal to the
value of parameter PV (Preset count
value), then the counter output parameter
Q = 1.
• If the value of the reset parameter R
changes from 0 to 1, then the current
count value is reset to 0.
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The CTD counts down by 1 when the value of parameter CD changes from 0 to 1. The
figure shows a CTD timing diagram with an unsigned integer count value (where PV = 3).
• If the value of parameter CV
(Current count value) is equal to
or less than 0, the counter output
parameter Q = 1.
• If the value of parameter LOAD
changes from 0 to 1, the value at
parameter PV (Preset value) is
loaded to the counter as the new
CV (Current count value).
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The CTUD counts up or down by 1 on the 0 to 1 transition of the Count up (CU) or Count
down (CD) inputs. The figure shows a CTUD timing diagram with an unsigned integer
count value (where PV = 4).
• If the value of parameter CV (Current count value) is equal to or greater than the value
of parameter PV (Preset value), then the counter output parameter QU = 1.
• If the value of parameter CV is
less than or equal to zero, then
the counter output parameter QD
= 1.
• If the value of parameter LOAD
changes from 0 to 1, then the
value at parameter PV (Preset
value) is loaded to the counter as
the new CV (Current count value).
If the value of the reset parameter
R is changes from 0 to 1, the
current count value is reset to 0.
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