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Entry type: FAQ Entry ID: 21498129, Entry date: 01/03/2006
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How can you influence the assignment of interrupts with SIMATIC PCs and check the assignment of resources in the system information in Windows 2000/XP?

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Influencing the assignment of interrupt with SIMATIC PCs

The table below explains how you can manually influence the assignment of interrupts in the BIOS Setup with SIMATIC RACK PC 840, BOX PC 840, BOX PC 620, Panel PC 870 and Panel PC 670. The changes made here also affect the assignment of interrupts in the Windows operating system.
 

No. Procedure:
1 To enter the BIOS you have to press "F2" while starting the PC.
2 In the BIOS Setup you select the "Advanced" tab.
3 In the Advanced menu you set all the interrupts to "Available" via "PCI Configuration > PCI/PNP ISA IRQ Resource Exclusion". All the interrupts that are set to "Reserved" here are reserved for the ISA modules, i.e. they are not available for the PCI modules.
4 There are four free interrupts (5, 7, 10, 11) that can be assigned arbitrarily to PCI IRQ Lines 1 to 4. Example:
  • PCI IRQ Line 1: IRQ 5
  • PCI IRQ Line 2: IRQ 7
  • PCI IRQ Line 3: IRQ 11
  • PCI IRQ Line 4: IRQ 10
5 If certain devices are not required (e.g. the COM interfaces), then you can set these to "Disabled" in the BIOS. Then interrupts 3 and 4 are available in addition. It is not necessary to reinstall Windows.

Assigning resources in Windows 2000/XP

The table below explains how you can check the assignment of resources in the system information in Windows 2000 and Windows XP.
 

No. Procedure:
1 In Windows XP or Windows 2000 start the input prompt via "Start > Run... > msinfo32" (as shown in Fig. 01) and then click on the "OK" button.


Fig. 01
2 In the next dialog called "System Information" you can see the assignment of resources under "Hardware Resources > IRQs" as shown in Fig. 02.


Fig. 02


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