Technical specifications 
  8.5 Hardware description 
SIMATIC IPC847D 
Operating Instructions, 01/2014, A5E32997454-AA 
153 
GND   B77  A77  PCIE_RX_N(3)  
PCIE_TX_N(4)   B79  A79  GND  
 
 
Note for bus modules with PCIe switch 
As long as no modules are plugged into the PCIe slots behind a PCIe switch, the IRQs are 
not used by the PCIe switch, but the display only shows that these IRQs would be used if 
modules were plugged in. 
The PCIe switch is displayed in Windows Device Management as "PCI standard PCI-to-
PCI bridge".