Hardware Information
7-26
SIMATIC Rack PC 840 Manual
A5E00104826-03
7.6 Bus Board
7.6.1 Design and Mode of Operation
The bus board is designed as a passive link between the motherboard and the
expansion modules. It is mounted by means of four screws.
The bus board has seven PCI slots and five long ISA slots. Ten expansion
modules corresponding to ISA specifications (Rev. 3.1) and PCI specifications
(Rev. 2.0) can simultaneously be inserted. All PCI slots are master capable. The
expansion modules are powered via the link between the bus board and the
motherboard and via the auxiliary ATX contect directly from the power supply unit.
PCI
ISA
AB
11
49 49
52 52
62 62
BA
11
Auxillary ATX
18
18
31 31
DC
1
1
Figure 7-10 Connector Assignment on the Bus Board
Connector Assignment Auxillary ATX
Pin No. Designation Description Input / Output
1, 2, 3 GND Masse
4, 5 +3.3 V +3.3 V
6 +5 V +5 V
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