Siemens SIMATIC Box PC 820 - Interrupt Assignment (Hardware)

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Box PC 820 / PC FI45 V2, Manual
A5E00051531-03
2.12 Interrupt Assignment (Hardware)
Interrupt Description
NMI Expansion slots signal I/O channel
IRQ 0 Internal timer (system clock)
IRQ 1 Keyboard buffer full
IRQ 2 Cascading of interrupt controller 2
IRQ 3 Serial port 2 (COM2) can be enabled via Setup
IRQ 4 Serial port 1 (COM1/TTY) can be enabled via Setup
IRQ 5
IRQ 6 Floppy
IRQ 7 Parallel port 1 /printer port LPT1/EPP/ECP) can be enabled via Setup
IRQ 8 Battery-backed real-time clock
IRQ 9 VGA controller usually unassigned
IRQ 10 MPI (recommended for Plug & Play), can be enabled via Setup
IRQ 11 Reserved for SafeCard on motherboard (SOM)
IRQ 12 S/2 Mouse/keyboard trackball can be enabled via Setup if no need for mouse or trackball
function.
IRQ 13 Arithmet. coprocessor error
IRQ 14 Primary IDE interface
IRQ 15 Secondary IDE interface
Motherboard
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