5. Programming on the device
5.7 Using operands in a program
5.7.5 Timer constant
Timer constants are used at the function block inputs for the T and AC function
blocks.
The value range of timer constants depends on the time range of the function block
for which they are being used.
The moment you drag & drop the timer constant from the left pane and onto the work
pane and connect it to the corresponding function block input, the timer constant will
be assigned the same time range as the function block and will display a default
value of 0 with the corresponding resolution.
If, for instance, the time range for the function block is configured as S - 000.000 with
a resolution of 5 ms, the timer constant will be shown with a default value of 0.000 s.
Quickly entering values with the keyboard
You can enter values for timer constants using the keyboard. Please note that the val-
ues you enter must fall within the configured time range.
To enter timer constant values with the keyboard, follow the steps below:
Select the timer constant by clicking on it.
Enter a value with the keyboard, e.g., <9>.
Press the Enter key to confirm – the value will be applied as the timer constant
value.
To cancel instead, simply press the ESC key.
Values that fall outside the set resolution will be rounded down automatically.
For instance, entering a value of <9> for a time constant with a time range of S -
000.000 and a resolution of 5 ms will result in the value being rounded down to 5 ms.
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