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Page 7.3 - 24 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Digital in- and outputs
Fig. 7.3.7 Example of a signal flow diagram for input I1 (
di.05=16)
Input signal after
filtering
t
t
Input trigger
7.3.9 Strobe-dependent Inputs (di.06, di.07, di.08)
A strobe signal is used mainly for triggering the input signals. For example, two inputs shall be used for the
parameter set selection. But the signals for the control do not arrive exactly even, so for a short time it would
be switched into an unintended set. With active strobe (scanning signal) the current input signals of the strobe-
dependent inputs are accepted and kept until the next scanning.
Which inputs are switched by strobe?
With di.08 any input can be selected as strobe-dependent input. With the control release di.08 has no function
since this is a static input.
From where comes the strobe signal?
The strobe input is adjusted with parameter di.06. If several inputs are adjusted as strobe they are linked in
OR-operation.
Edge-active or static strobe?
As a standard the strobe is edge-active, i.e. the input conditions on the strobe input are accepted with rising
edge and maintained until the next rising edge. For some applications it is sensible to use the strobe in a man-
ner of a gate function. In that case the strobe signal is static, i.e. the input signals are accepted for as long as
the strobe signal is set (or for as long as the gate is open).
di.07 Strobe-mode
di.07: strobe mode
Value Function Description
0 edge-active strobe (default)
Input states are transferred with the rising edge at the strobe input
and held until the next rising edge.
1
static strobe - frooze if stro-
be is not active Input states are updated as long as the strobe signal is set. If the
signal becomes inactive, the state is held.
2
static strobe - only active at
active strobe Input states are updated as long as the strobe signal is set. If the
signal becomes inactive, the state is reset.