Mitsubishi Electric WS0-CPU0 Operating Manual page 244

Chapter 9
ATTENTION
ATTENTION
241
Logic programming – Function blocks
Input signals of the function block
The Press setup function block supports the following input signals:
Start/Release
The Start/Release input signal is used to indicate the beginning and the end of the
press movement. A rising edge (Low to High) at the Start/Release input signals a
start of the press. A Low Start/Release input signals a stop of the press. If Restart
interlock is set to When Release 1 or Start/Release is Low, a valid restart sequence
is required after a stop that was caused by a Low Start/Release input signal.
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), the Enable output of this press
contact function block must be connected with the Release 1 (static) input of the
Press setup 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), if Release 2 (start)
is High. If 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. The Top input signal is used for
single-stroke protection. When the Single stroke protection configuration parameter
is set to With, the Enable output changes to Low when the Top input 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.