Siemens SIMATIC - Page 102

Digital modules
3.12 Digital input module SM 321; DI 16 x DC 24/125 V; with hardware and diagnostic interrupts (6ES7321-
7EH00-0AB0)
S7-300 Module data
102 Manual, 06/2017, A5E00105505-AJ
Interrupt-triggering channels
The relevant hardware interrupt-triggering channel is logged in the OB40_POINT_ADDR
variable of the start information of OB40. The figure shows the bit assignments of DWORD 8
in the local data.
Byte
Variable
Data type
Description
6/7
OB40_MDL_ADDR
WORD
B#16#0
Address of the interrupt-triggering module
starting
at 8
OB40_POINT_ADDR DWORD see the figure
below
Indication of the interrupt-triggering inputs
Figure 3-8 Start Information of OB40: which event has triggered the hardware interrupt