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5.8
Timer function (extra code)
Using the timer function, the control action can be influenced by means of the adjustable time
t i 0
. After the timer has been started by power ON, by pressing the key, or via the logic input,
the timer start value
gone above or below a programmable tolerance limit. When the timer has run down, several
events are triggered, such as control switch-off (output 0%) and setpoint switching. Furthermo-
re, it is possible to implement timer signalling via an output.
Example:
t i 0
is counted down to 0, either instantly or after the process value has
w
- setpoint
x
- process value
S P
- programmed setpoint
t i 0
- timer start value
----- - timer signalling
(here: C122=1)
i
- increment key
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