Chapter 9
255
Logic programming – Function blocks
Release 1 (static)
The input signal
Release 1 (static)
is mandatory. The
Enable
output always changes
immediately to Low, if
Release 1 (static)
is Low.
If this function block is used together with a press contact function block (e.g.
Eccentric press contact or Universal press contact), its
Enable
output must be
connected with the
Release 1 (static)
input of this function block.
Release 2 (start)
The input signal
Release 2 (start)
is optional. If
Release 2 (start)
is configured, the
Enable
output can only change to High (e.g. during switching on), when
Release 2
(start)
is High. When the
Enable
output is High,
Release 2 (start)
is no longer
monitored.
Do not use the Release 2 (start) input for safety purposes!
Do not use the
Release 2 (start)
input for initiating safety stops, because this input is
evaluated temporarily during the start sequence only. Otherwise the operator of the
press will be in danger.
Top
The
Top
input signal is used in order to determine the end of the press cycle (i.e. the
press has reached the top dead center). This signal is available at the function blocks
Eccentric press contact or Universal press contact.
Do not use the Top input for safety purposes!
Connect the
Top
input only with the
Top
output of an Eccentric press contact or
Universal press contact function block or to an equivalent signal source. Do not use
the
Top
input for initiating safety stops. Otherwise the operator of the press will be in
danger.
Upstroke input
If upstroke muting is enabled (i.e. if the
Max. Up-Stroke muting time
is greater than
0), the
PSDI
input of the function block is bypassed if the
Upstroke
input is High and
the
Top
input remains Low.
Connect the
Upstroke
input only with the
Upstroke
output of an Eccentric press
contact or a Universal press contact function block.
Restart input
If
Restart interlock
has been set to
Without
, a
Restart
signal is not required in order
to restart the press after the
Enable
output has changed to Low.
If
Restart interlock
has been set to
Always
and the
Enable
output changes to Low,
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. The only exception to this rule is formed by the
cycle beginning. In this case the
Restart interlock
parameter does not have any
effect on the function block.
If
Restart interlock
has been set to
Always
and the
Max. Up-Stroke muting time
has been configured to 0 s, a Low signal at the
PSDI
input during the runup sets the
Enable
output immediately to Low.
ATTENTION
ATTENTION
Note
Summary of Contents for SW1DNN-WS0ADR-B
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