Mitsubishi Electric WS0-CPU0 Operating Manual page 252

Chapter 9
ATTENTION
ATTENTION
Figure 233:
Sequence/timing diagram
for the Press automatic
function block using the
Stop request and Upstroke
inputs
249
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 signal must be
connected with the Release 1 (static) input of this function block.
Release 2 (start)
The input signal Release 2 (start) is optional. When 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.
Restart input
If the Restart interlock after stop condition parameter has been set to Without, a
Restart signal is not required in order to restart the press after any kind of stop.
If the Restart interlock after stop condition parameter has been set to With 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.
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 diagram