Detailed descriptions
16.1 Motherboard
SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
16-11
16.1.5
Internal ports
Pin assignment of the internal ports
Interface
Position
Connector
Description
Memory
Internal
X3, X4, X5
3 DIMM sockets, 64-bit
Processor
Internal
X1
Socket for FCPGA mobile processor
Bus expansion
Internal
X20
Socket for extended bus, assigned with
ISA and PCI bus signals
Power supply
Internal
X50, X5000
20-pin power connector, 4-pin power
connector
Floppy
Internal
X26
Two drives can be installed (82078
compatible) 360 kB, 720 kB, 1.2 MB,
1.44 MB 3F0h–3F7h, 370h–377h,
switchable IRQ 6, edge triggered
34-pin, socket for standard floppy disk
drive
primary EIDE
(e.g. hard
disk drive)
X7
Internal
Secondary EIDE
(e.g. CD ROM)
Internal
X11
170h–177h, 1F0h–1F7h, switchable
IRQ14, IRQ15, edge triggered 40-pin,
2.54 mm male connector, operation of up
to two disk drives
PS connection for CPU
fan
Internal
X41
CPU fan power supply, 3-pin male
connector
PS connection for
equipment fan
Internal
X42, X43
Power supply for equipment fan
(controlled), 3-pin, male connector
Connection for SCSI LED Internal
X39
Input for SCSI drive activity display
Internal USB port
Internal
X2033
Connection for the USB port cable to the
front panel of the computer
Front panel port
X44
OP connection
Assignment for SCSI activity connector, X39 Type JST B2B-PH-SM3-TB
Pin No.
Abbreviations
Meaning
Input /Output
1
NC
-
2
SCSI HD_N
0-V level means that the SCSI port is active
Input