Detailed descriptions
16.1 Motherboard
SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
16-9
Ethernet RJ45 connection, X700
Ethernet RJ45 connection
PinNo.
Abbreviations
Meaning
Input /Output
1
TD+
Transmitted data
Output
2
TD-
Transmitted data
Output
3
RD+
Received data
Input
4, 5
1
SYMR
Internal 75-Ohm terminating
resistor
–
6
Received data
Input
7, 8
1
SYMT
Internal 75-Ohm terminating
resistor
–
S
Shield
–
LED yellow
Connection
–
LED green
Activity
–
1
is not necessary for data transfer