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
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