Chapter 9
246
Logic programming – Function blocks
Restart input
If the
Restart interlock
parameter has been set to
Without
, a
Restart
signal is not
required in order to restart the press after any kind of stop. The
Restart interlock
parameter can also be set to the following values:
When Release 1 or Release 3 or Start/Release is Low
When Release 1 or Release 3 is Low or Top changes to High
Always
When Release 1 or Release 3 is Low
This parameter determines when a
Restart
signal is expected as input signal for the
function block.
If the
Enable
output changes to Low because of the above-mentioned settings of the
configuration parameters for the
Restart interlock
, the
Enable
output can only be reset
after a valid restart sequence with a Low-High-Low transition (minimum 100 ms or 350
ms; shorter pulses and pulses longer than 30 s will be ignored) has been carried out.
Disable Restart Interlock (for EN3) on Top
The
Disable Restart Interlock (for EN3) on Top
parameter prevents the restart
interlock being activated if the
Release 3 (safety)
input changes to Low during a
regular stop of the press. This means that if the
Disable Restart Interlock (for EN3)
on Top
parameter is configured as
Yes
and the
Enable
output changes to Low as a
result of the
Top
input changing to High, then the
Restart required
output will not
change to High if the
Release 3 (safety)
input changes to Low as long as the press
has not been restarted.
Output signals of the function block
Restart required
The
Restart required
output is High, when a valid restart sequence is expected at the
Restart
input.
Sequence/timing diagrams
Figure 229:
Sequence/timing diagram
for the Press single stroke
function block when
Start/Release is configured
in stepping mode
Figure 230:
Sequence/timing diagram
for the Press single stroke
function block when
Start/Release is configured
in start only mode
Figure 231:
Sequence/timing diagram
for the Press single stroke
function block with upstroke
muting of Start/Release and
Release 3 (safety)
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