Mitsubishi Electric WS0-CPU0 Operating Manual page 257

ATTENTION
Figure 238:
Sequence/timing diagram
for Upstroke muting in
Standard mode in two-cycle
mode
Note
Logic programming – Function blocks
Exclude any danger during the upstroke movement of the press!
If you use upstroke muting, you must ensure that during the upstroke period no
hazards are present, e.g. by the up movement itself.
The Max. Up-Stroke muting time can be configured. The upstroke muting timer
starts with a rising edge (Low to High) at the Upstroke input. If the timer reaches the
configured Max. Up-Stroke muting time before another rising edge occurs at the
Upstroke input, upstroke muting is interrupted and, if the PSDI input is Low, the
Enable output is set to Low. When a second rising edge occurs at the Upstroke input,
upstroke muting begins again.
Start position
If the Start position parameter is set to Only on top, a start of the press is possible
only in the top position. In any other position a start is inhibited. If the press has been
stopped e.g. by interruption of the light curtain during a downstroke, you must change
to another press operating mode (e.g. in combination with the press setup function
block) to move the press back to the top position, because the N-break function block
inhibits a restart with this parameter setting.
If the Start position parameter is set to Only on top, the optional Control of drive
input must be connected in order to monitor whether the press is currently running or
has been stopped. This must be the signal which directly controls the press. Typically
the Control of drive input will be connected via a jump address or a CPU marker to
the logic editor signal which is connected to the physical output for the press.
Do not connect any physical input signals to the Control of drive input. Connect the
signal that controls the physical output for the press drive using a jump address or a
CPU marker.
 If a jump address is used, make sure that this signal is a loop-back. This is indicated
by a clock icon on the destination tag of the jump address. To this purpose, connect
the outputs of this function block to the following function blocks before you connect
the jump address to the Control of drive input. This applies especially if all
connections to the following function blocks are also realized using jump addresses.
 If a CPU marker is used, then a Routing function block must be used to split the
signal to the physical output for the press drive and to the CPU marker output.
If the Enable output changes to Low as a result of either the Release 1 (static) input
or the PSDI input has changed to Low, the diagnostic output Top required changes
to High. A restart of the press is prevented until the Top input has changed back to
High and no restart in another operating mode has occurred.
Chapter 9
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