Detailed descriptions 17.2 Bus board
17.2.3Exclusive PCI hardware interrupt
Applications demanding a
Setting up a reserved interrupt on the device
A reserved interrupt can only be set and used for PCI slots 2 and 4. Further reserved interrupts for use on the slots are not available.
A reserved interrupt cannot be used on any of the PCI slots in the basic configuration. In order to set up a reserved interrupt, you first need to disable the functions on the motherboard1). This is possible for PCI slots 2 and 4.
In order to set up a reserved interrupt on PCI slot 2, you need to disable USB Controller B (this is the external USB port at the top) in the BIOS.
In order to set up a reserved interrupt on PCI slot 4, you need to disable USB 2.0 Controller in the BIOS (all USB ports are now operating in USB 1.1 mode) and (if installed in the device) the PROFIBUS.
1)For information on how to disable motherboard functions, refer to the chapter dealing with the BIOS setup.
Assigning a reserved interrupt in the BIOS Setup
With the factory setting of the system BIOS, the interrupts are automatically assigned to the slots.
Depending on the system configuration, several slots may be assigned the same interrupt. Here we refer to interrupt sharing.
The special feature of the BIOS of the device is that interrupts can be set selectively and assigned to the interrupt channels of the slots. Here we refer to a reserved interrupt.
Specific interrupts can be assigned to slots in the Advanced menu of the BIOS setup. To do so:
To enable the use of a reserved interrupt at PCI slot 2, assign PCI IRQ Line 2 the required free interrupt, and all other PCI interrupt channels (channels 1, 3, 4) another interrupt.
To enable the use of a reserved interrupt at PCI slot 4, assign PCI IRQ Line 4 the required free interrupt, and all other PCI interrupt channels (channels 1, 2, 3) another interrupt.
To do this, open the Advanced menu of the BIOS setup and then PCI Configuration. In this menu you can assign the specific PCI IRQ channels to the respective interrupts.
You cannot assign interrupts that are already used by the system.
If you assign an interrupt which is already in use by the system or is reserved, the system marks it with a yellow star.
➜ May not be used.
Interrupts not reserved by the system can be assigned twice.
SIMATIC Panel PC 877 | |
Operating instructions, Release 07/2006, |
