A bending device with three cylinders is used to bend sheet metal. The double-acting cylinders are controlled via pulse-controlled 5/2-way valves. These can be reversed via a short pulse to one of the two magnet coils (pulse duration at least 100 ms) and then remain in this position until another reversal occurs via a pulse to the other magnet coil. The bending process is started with the S0 button. Then the sheet is first held over cylinder A, then the first bending process takes place over cylinder B (pre-bending) and finally the final bending over cylinder C. The cylinders are then returned in reverse order. Pressing the emergency stop button S1 leads to an immediate Stop of all cylinders. By pressing the reset button in the model, the sheet metal will reset to its original shape.
Input / output assignment
The inputs and outputs of the model are assigned as follows (the designation input or output refers to
in each case on the connected controller):
Input No. Name TwinCAT-variable name Description
1 S0 I_S1 Start Button (normally open)
2 S1 I_S2 E-Stop (normally open)
3 B1 I_B1 Limit switch cylinder A home (normally open)
4 B2 I_B2 Limit switch cylinder A work (normally open)
5 B3 I_B3 Limit switch cylinder B home (closer)
6 B4 I_B4 Limit switch cylinder B work position (normally open)
7 B5 I_B5 Limit switch cylinder C home (normally open)
8 B6 I_B6 Limit switch cylinder C work (normally open)
Output No. Name TwinCAT-variable name Description
1 Y1 O_Y1 cylinder A working position
2 Y2 O_Y2 cylinder A home position
3 Y3 O_Y3 cylinder B working position
4 Y4 O_Y4 cylinder B home position
5 Y5 O_Y5 cylinder C working position
6 Y6 O_Y6 cylinder C home position