Program instructions
7.18 Subroutine
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
391
Example: Subroutine call with call parameters
STL only:
Network 1
LD I0.0
CALL SBR_0, I0.1, VB10, I1.0, &VB100, *AC1, VD200
To display correctly in LAD and FBD:
Network 1
LD I0.0
= L60.0
LD I0.1
= L63.7
LD L60.0
CALL SBR_0, L63.7, VB10, I1.0, &VB100, *AC1, VD200
Note
There are two STL examples provided above. STL programmers can use th
e first simplified
STL instructions, which can only be displayed in the STL editor. This is because the BOOL
parameters used as LAD/FBD power flow inputs are not saved to L memory.
The second set of compiler generated STL instructions can be displayed in t
he LAD, FBD,
and STL editors, because L memory is used by the program compiler to save the state of the
BOOL input parameters that are assigned as power flow inputs in LAD/FBD.
Address parameters such as IN4 (&VB100) are passed into a subroutine as a DWORD
(unsigned double word) value. The type of a constant parameter must be specified for the
parameter in the calling routine with a constant descriptor in front of the constant value. For
example, to pass an unsigned double word constant with a value of 12,345 as a parameter,
the constant parameter must be specified as DW#12345. If the constant describer is omitted
from the parameter, the constant can be assumed to be a different type.
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