Mitsubishi Electric WS0-CPU0 Operating Manual page 160

Chapter 9
ATTENTION
Figure 135:
Sequence/timing diagram
for the Restart function block
157
Logic programming – Function blocks
Restart required output
The Restart required output shows by pulsing at 1 Hz that the function block expects
a valid restart pulse at the Restart input so that the Enable output can become High.
This is the case if the Release condition fulfilled output is High, i.e. all activated
Release inputs are High, but the Enable output is still Low. Typically this output is
used to control a signal lamp.
Enable output
The Enable output becomes High, if the Release condition fulfilled output is High
and a valid restart pulse has been detected at the Restart input, provided that all
activated Release inputs remain High.
The Min. restart pulse time defines the minimum required duration of the pulse at the
Restart input. Valid values are 100 ms and 350 ms. If the pulse duration is shorter
than the configured minimum pulse time or longer than 30 s, the pulse is ignored.
The Enable output becomes Low, if one or more Release inputs become Low.
Ensure that the transitions of the signals for restarting fulfill the requirements!
In case of a short-circuit to High (to 24 V DC) at a physical input, the evaluated signal
can have a pulse when the signal is reset due to the short-circuit detection. If such a
pulse can result in a dangerous state in the machine, the following points have to be
observed:
 Ensure protected cable laying for the signal line (due to cross-circuiting to other
signal lines).
 No short-circuit detection, i.e. do not reference to test outputs.
Sequence/timing diagram