
11-3
Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
11.2 Add Double Integer
A signal state of 1 at the Enable (EN) input activates the Add Double Integer
instruction. This instruction adds inputs IN1 and IN2. The result can be
scanned at OUT. If the result is outside the permissible range for a double
integer, the OV and the OS bit of the status word are 1 and the ENO is 0.
Certain restrictions apply to the placement of integer math boxes (see
Section 6.1).
Table 11-2 Add Double Integer Box and Parameters
LAD Box
Parameter Data Type Memory Area Description
EN BOOL I, Q, M, D, L Enable input
ADD_DI
ENO BOOL I, Q, M, D, L Enable output
IN1 DINT I, Q, M, D, L First value for addition
IN2 DINT I, Q, M, D, L Second value for addition
OUT DINT I, Q, M, D, L Result of addition
Status Word Bits
BR CC 1 CC 0 OV OS OR STA RLO FC
Write x x x x x x 1 x x
I 0.0
A signal state of 1 at input I 0.0 activates
the ADD_DI box. The result of the addition
MD0 + MD4 is put into memory double
word MD10. If the result is outside the
permissible range for a double integer or
the signal state of input I 0.0 is 0, output
Q 4.0 is set.
Q 4.0
ADD_DI
IN2
EN ENO
MD4 MD10
IN1MD0
S
Function is executed (EN = 1):
NOT
OUT
Figure 11-2 Add Double Integer
Description
Integer Math Instructions
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