Siemens SIMATIC S7-1200

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Extended instructions
Basic instructions
Communication
Technology
S7-300
S7-400
S7-1200 S7-1500
Description LAD/FBD
STL
(not S7-1200)
SCL
✔ ✔
With a tag of TYPE DB_ANY, compare the
data type of an indirectly addressed DB with a
data type for EQUAL.
NE_TypeOfDB: *)
✔
✔
Check for EQUALS NULL pointer
IS_NULL
*)
✔
✔
Check for UNEQUALS NULL pointer
NOT_NULL
*)
*) Application examples for SCL:
IF TypeOf(...) = INT THEN ... // corresponds to EQ_Type
IF TypeOfElements(...) = INT THEN ... // corresponds to EQ_ElemType
IF TypeOfDB(...) = INT THEN ... // corresponds to EQ_TypeOfDB
IF ... <> NULL THEN ... // corresponds t
o NOT_NULL
Instead of "=", you can also use other operators, e.g.: "<>".
Instead of "INT", you can also use any other data types or data types that you have defined, e.g.: "REAL", "Recipe".
✔
✔
Check for ARRAY
IS_ARRAY
✔
Compare tag structured data types
CompType
nn
Mathematical functions
✔ ✔
Calculate
CALCULATE
(SCL network in
LAD/FBD)
nn
nn
✔
✔
✔
✔
Add
ADD
+
+
✔
✔
✔
✔
Subtract
SUB
-
-
✔
✔
✔
✔
Multiply
MUL
*
*