Chapter 9
185
Logic programming – Function blocks
Reset
A falling edge on the
Reset
input restarts the start sequence. An active inch mode is
stopped and the function block back goes into Waiting for start mode. The
Enable
output as well as the
Forward active
and the
Backward active
output will become
Low while the
Startup active
output will become High.
Startup active output
The
Startup active
output is Low during the start sequence (waiting or release time
is running) or if inch mode is active (the
Enable
output is High). The
Startup active
output can be used to lock other parallel Start warning function block instances. To
this purpose, connect the
Startup active
output via a CPU marker to the
Lock
input
of the other function block instance (see Figure 171).
Waiting time active output and Release time active output
These outputs indicate whether the waiting time or the release time is active.
Figure 171:
Logic example for a
combination of two Start
warning function blocks
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