Mitsubishi Electric WS0-CPU0 Operating Manual page 251

Chapter 9
Logic programming – Function blocks
Input parameters and input signals of the function block
Stop request
The Stop request parameter determines the Stop state of the Press automatic
function block. If this parameter is configured as When Start/Release input is Low,
the Start/Release input signal is used to control the Enable output directly. If
configured to When Stop input is High, the Enable output changes to Low, when the
Stop request input is High.
In both cases the Enable output changes to High, when the following conditions are
fulfilled:
 A transition from Low to High occurs at the Start/Release input; and
 the Stop request input is Low, if it is connected; and
 no other reason is present that would normally trigger a stop signal, e.g. Release 1
(static) is Low.
Do not use the Start/Release and Stop inputs for safety stops!
Independent of the configured stop request mode, the inputs Start/Release and Stop
ATTENTION
request must not be used for initiating safety stops. These inputs can only be used for
setting automation control stop requests. Signals initiating safety stops (e.g. safety
stop) must be connected to the Release 1 (static) input of the function block.
Upstroke input
If the Upstroke input parameter is configured as With, a High signal at the Upstroke
input allows the press to stop both during the downstroke and in the top position. If this
parameter is set to Without, regular stops are only possible in the top position.
Note Connect the Upstroke input only to the Upstroke output of an Eccentric press contact
or a Universal press contact function block.
Start/Release
The Start/Release input signal is used to provide signals for the beginning and end of
the press movement. If a rising edge (Low to High) is detected at the Start/Release
input, the Enable output becomes High, provided that the Stop request input is Low
and no other reason is present that would normally trigger a stop signal, e.g. Release
1 (static) is Low. A valid restart sequence can be required before a signal transition of
Start/Release if the Restart interlock after stop condition parameter is set to With.
If you connect a command device (e.g. a two-hand control) to the Start/Release input,
you must ensure that unintentional restarting is not possible.
Stop request
If the Stop request parameter is set to When Stop input is High, the Stop request
input is used to signal a stop to the press. When the Stop request input is High, the
Enable output is set to Low.
This input should only be used if the Stop request parameter has been set to When
Stop input is High. The Stop request input is not used when the Stop request
parameter has been set to When Start/Release input is Low. A valid restart
sequence can be required before a signal transition of Start/Release when the
Restart interlock after stop condition parameter is set to With. The Stop request
input is designed for the connection of signals that are not safety-relevant (e.g. from a
programmable controller). Safety-relevant signals may only be connected to the
Release 1 (static) input, not to the Stop request input.
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