Hardware description
A.5 System resources
SIMATIC IPC627E
148
Operating Instructions, 12/2018, A5E44297201-AA
A.5.4
Exclusive PCI hardware interrupt
Applications demanding a high-performance interrupt require a high-speed hardware
interrupt reaction. The PCI hardware interrupt should be used only by one resource in order
to ensure high-speed reaction of the hardware.
Exclusive interrupt on the device (APIC mode)
IRQ assignments for Windows systems, (APIC mode)
Ethernet 1
16
1, 2
Ethernet 2
17
1
Profibus/MPI
19
1
PCI slot 1
20
1
PCI slot 2
21
1
PCI Express slot
16
1, 3
1)
Requirement: The modules in the PCI slots each require only one interrupt
2)
Requirement: VGA and PCIexpress do not require an interrupt
3)
Requirement: VGA does not require an interrupt and Ethernet1 is disabled
Assigning exclusive interrupts in the firmware (PIC mode)
The interrupts are automatically assigned to the slots at system startup due to the default
settings in system BIOS.
Several slots may share the same interrupt, depending on the system configuration. This
functionality is known as interrupt sharing. Exclusive interrupts are not available in PIC
mode. Disable specific system resources in order to obtain exclusive interrupts. BIOS
assigns the PIC interrupts at random during restart of the system.
