Mitsubishi Electric WS0-CPU0 Operating Manual page 237

Figure 218:
Press cycle for the Universal
press contact function block
with falling edge of TDC
before BDC
Logic programming – Function blocks
If the Reset input is disabled, an error can be reset only by stopping the logic
execution, e.g. by a power cycle or by changing the system state from the Run state to
the Stop state and back to the Run state with the Setting and Monitoring Tool.
Top output and Upstroke output
The Top output is typically used to stop the press and is connected to another
complementary press function block, e.g. Press setup or Press single stroke.
The Upstroke output is typically connected to another complementary press function
block, e.g. Press single stroke or Press Setup. Additionally it can be used to initiate
upstroke muting.
This function block sets the Upstroke output and the Top output based on value
changes of the cam inputs. If the function block detects an error, both outputs are set
to Low.
The Top output is set to High if the TDC input is Low. The Upstroke output is set to
High with a rising edge (transition from Low to High) of the BDC input. It is set to Low
either with a falling edge of the TDC input, or with a falling edge of the BDC input,
whichever occurs first.
If the function blocks starts (power up, disable  enable) with the BDC input High, the
Upstroke output will remain Low for the first press cycle.
Chapter 9
234