Display Of The States Of The Interrupt Inputs Of The Cpu 312 Ifm; Start Information For Ob 40 For The Interrupt Inputs Of The Integrated I/Os - Siemens SIMATIC S7-300 Series Reference Manual

CPUs
Start information for OB40
Table 1-10 shows the temporary (TEMP) variables of OB40 relevant for the
"Interrupt inputs" of the CPU 312 IFM. Refer to theSystem and Standard functions
reference manual for details on the process interrupt OB.
Table 1-10 Start Information for OB 40 for the Interrupt Inputs of the Integrated I/Os
Byte Variable
6/7 OB40_MDL_ADDR
8 on OB40_POINT_ADDR
Display of the Interrupt Inputs
In variable OB40_POINT_ADDR, you can view the interrupt inputs which have
triggered a process interrupt. Figure 1-5 shows the allocation of the interrupt inputs
to the bits of the double word.
Note: Several bits can be set if interrupts are triggered by several inputs within
short intervals (< 100 ms). That is, the OB is started once only, even if several
interrupts are pending.
31 30
Reserved
PRIN: Process interrupt
Figure 1-5

Display of the States of the Interrupt Inputs of the CPU 312 IFM

1-26
Data Type
WORD B#16#7C
DWORD See Figure 1-5
5 4 3 2 1 0 Bit No.
PRIN from
PRIN from
PRIN from
PRIN from
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
Description
Address of the interrupt triggering
module (in this case, the CPU)
Signaling of the interrupt triggering
integrated inputs
I124.6
I 124.7
I125.0
I 125.1
A5E00111190-01