Detailed descriptions
16.4 System resources
SIMATIC Rack PC 840 V2
16-20
Operating Instructions, Edition 05/2006, A5E00248055-04
PCI Interrupt Lines
Description
Comment
USB 1.1 controller A
fixed
Channel 1
Ethernet
2)
Channel 2
USB 1.1 controller B
2)
USB 1.1 controller C
2)
Channel 3
VGA
fixed
USB 2.0 controllers A, B, C
2)
Channel 4
PROFIBUS
2)
free in version without PROFIBUS
1)
PCI boards and the on-board PCI devices require PCI interrupt channels. These interrupt
channels are sharable and plug and play compatible. This means several devices can share
the same interrupt. The IRQ is assigned automatically. PCI interrupt channels must be
derived from the ISA interrupt pool, which means that the PCI modules also use ISA
resources. This allocation is done automatically, too. Plug and play incompatible ISA cards
can be allocated to a free IRQ by setting the "IRQ Resource Exclusion" of the corresponding
interrupt to reserved in the BIOS Setup menu. Refer to the respective ISA module
documentation for the respective interrupt to be allocated.
2)
These functions can be disabled in the Setup This releases allocated resources.
