Siemens Simatic S5 Operating Instructions Manual page 23

Example 1:
I n s e r t i n g a s e r i e s contact
Example 2;
I n s e r t i n g a contact i n p a r a l l e l
with a l l other contacts
Example 3:
I n s e r t i n g a contact a f t e r a
p a r a l l e l branch