Siemens SIMATIC S5 Manual page 253

Examples
6.4.4 Schematic Diagrams of the Organization Blocks (Program Framework)
6.4.4.1
copy ID4 to FD4
direct
yes
Call FB53
yes
Call FB54 or FB50 (DX) only withS5-135U andS5-155U
direct
yes
Call FB51
indirect param. ass,
yes
Call FB52
Call FBI 92: copy DB
FY15 = O, reset F 16.0
Copy FD14 to QD4 (QD8 with S5-1 15U)
6 - 6 0
and
F 6.1 = 1
and
and
F 6.1 = 1
and
and
F 6.1 = O and
execute FB164
F 6.0= O
execute FBI 65
F 6,0 = 1
execute FB165
F 6.0 = 1
I
I
I
I
I