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Section 5
Local Human-Machine-Interface LHMI
72
Operating sequence
The operation mode is set individually for each output, either OFF, TOGGLE or
PULSED.
Setting OFF
This mode always gives the output the value. A change of the input value does not
affect the output value.
Input value
Output value
IEC09000330 V1 EN
Figure 26:
Sequence diagram for setting OFF
Setting TOGGLE
In this mode the output toggles each time the function block detects that the input has
been written (the input has completed a pulse). Note that the input attribute is reset
each time the function block executes. The function block execution is marked with
a dotted line below.
Input value
Output value
IEC09000331 V1 EN
Figure 27:
Sequence diagram for setting TOGGLE
Setting PULSED
In this mode the output will be high for as long as the setting pulse time. After this time
the output will go back to 0. The input attribute is reset when the function block detects
it being high and there is no output pulse.
Note that the third positive edge on the input attribute does not cause a pulse, since the
edge was applied during pulse output. A new pulse can only begin when the output is
zero; else the trigger edge is lost.
1MRK 505 288-UEN A
IEC09000330-1-en.vsd
IEC09000331_1_en.vsd
Technical manual
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