Siemens SIMATIC Series Operating Instructions Manual page 162

Technical specifications
8.5 Hardware description
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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.
Interrupt PIC and APIC mode
Interrupt APIC mode
BIOS Default Interrupt PIC mode, e.g. DOS
Operating Instructions, 04/2020, A5E49948632-AA
SIMATIC IPC547G