Siemens Simatic series - 8.5.3 Interrupt Assignment

Technical specifications
8.5 Hardware description
SIMATIC IPC547G
162 Operating Instructions, 04/2020, A5E49948632-AA
1) Host PCI-IRQ A to H is assigned to IRQ 16 to 23 permanently in APIC mode. Host PCI-IRQ A
to H is assigned to IRQ 0 to 15 automatically by the BIOS in PIC mode. A specific assignment
cannot be forced.
X
Interrupt PIC and APIC mode
Y
Interrupt APIC mode
Z
BIOS Default Interrupt PIC mode, e.g. DOS