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Chapter 9
245
Logic programming – Function blocks
Release 3 (safety)
The
Release 3 (safety)
input signal is an optional signal. The
Enable
output can only
change from Low to High if
Release 3 (safety)
is High. If
Release 3 (safety)
is Low
and
Upstroke
is Low, the
Enable
output is set to Low and a restart sequence has to
occur in accordance with the settings.
If
Release 1 (static)
and
Upstroke
are High and the maximum upstroke muting time
is configured to a value higher than 0, the
Release 3 (safety)
signal is muted.
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. The
Top
input signal is used for
single-stroke protection. The
Enable
output changes to Low when the
Top
input
signal changes from Low to High.
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.
Mode for upstroke muting
If the
Max. Up-Stroke muting time
is not set to 0, the
Upstroke
input has to be
connected.
Connect the
Upstroke
input only with the
Upstroke
output of an Eccentric press
contact or a Universal press contact function block.
In this case, the
Release 3 (safety)
and
Start/Release
input signals are muted
(muting of the
Start/Release
input depends on the parameter settings) when the
Enable
output is High and the
Upstroke
input is High. This function block does not
carry out a plausibility check of the
Upstroke
input signal. If the
Upstroke
input is
High several times during a single press cycle, it is possible to mute the corresponding
input of the function block several times. If a signal shall not be muted, it should be
connected to the
Release 1 (static)
input by means of an AND function block together
with other signals that have to be connected to the
Release 1 (static)
input.
Exclude any danger during the upstroke movement of the press!
If you use upstroke muting, you must ensure that during the upstroke period no
hazards are present, e.g. by the up movement itself.
Max. Up-Stroke muting time
The
Max. Up-Stroke muting time
can be configured. This time begins with the rising
edge (Low to High) of the signal at the
Upstroke
input. If the timer reaches the
configured
Max. Up-Stroke muting time
before a falling edge (High to Low) occurs at
the
Upstroke
input, the function block terminates the muting of the
Release 3 (safety)
and
Start/Release
inputs. If from this moment on one of these two inputs becomes
Low, the
Enable
output is also set to Low.
ATTENTION
Note
ATTENTION
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