A bending device with three cylinders is used to bend a sheet of metal. The sheet is first held by cylinder A, then the first bending process is performed by cylinder B (bending) and finally the final bending is performed by cylinder C. The cylinders are then retracted in reverse order. Pressing the emergency stop button brings all cylinders to an immediate standstill. Pressing the reset button in the model resets the sheet 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 the connected control unit)
refers to the connected control unit):
Input no. Name TwinCat variable name Description
1 S0 I_S0 Start button (NO contact)
2 S1 I_S1 E-Stop (normally closed contact)
3 B1 I_B1 Limit switch cylinder A retracted (NO contact)
4 B2 I_B2 Cylinder A limit switch extended (NO contact)
5 B3 I_B3 Cylinder B limit switch retracted (NC contact)
6 B4 I_B4 Cylinder B limit switch extended (NO contact)
7 B5 I_B5 Cylinder C limit switch retracted (NO contact)
8 B6 I_B6 Cylinder C limit switch extended (NO contact)
Output no. Name TwinCat variable name Description
1 Y1 O_Y1 Cylinder A extended
2 Y2 O_Y2 Retract cylinder A
3 Y3 O_Y3 Extend cylinder B
4 Y4 O_Y4 Retract cylinder B
5 Y5 O_Y5 Extend cylinder C
6 Y6 O_Y6 Retract cylinder C