Dear user,

Your logic can be easily converted to LAD/STL/FBD version in STEP 7, But life is much easier for programmer in SIMATIC World.

A     M      0.5                  //clock memory for 1s pulse
CU    C      0
NOP   0
A(
L     C      0
L     60
>=I
)
CU    C      1
R     C      0

A(
L     C      1
L     60
>=I
)
CU    C      2
R     C      1

A(
L     C      2
L     24
>=I
)

R     C      2

In your case, you can use SFB4 (On-delay in IEC libraries). The output is in TIME and can be compared simply by DINT comparison instruction.The Ultimate value supported will be T#24D_20H_31M_23S_647MS .

I hope it helps,

hdhosseini