Siemens SIMATIC IPC547E Operating Instructions Manual page 110

Technical specifications
8.5 Hardware description
Slot-specific interrupt assignment
Interrupt routing of the slot connectors on the motherboard.
1)
Y
Z
110
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 APIC mode
BIOS Default Interrupt PIC mode, e.g. DOS
Operating Instructions, 09/2013, A5E32317120-AA
SIMATIC IPC547E