PROFIBUS Manual
The D-type connector is the recommended connector for IP20 installations (in the switch cabinet).
|
Sockets on device |
Pin no. |
Signal |
Function |
|
1 |
Shield |
Protective earth |
not recommended |
2 |
M24 |
Frame ground for 24V voltage |
Optional |
3 |
RxD/TxD-P |
Data line plus (B conductor) |
Mandatory |
4 |
CNTR-P |
Repeater direction check |
Optional |
5 |
DGND |
Data ground |
Mandatory |
6 |
VP |
+5V supply for bus termination |
Mandatory |
7 |
P24 |
+24V supply |
Optional |
8 |
RxD/TxD-N |
Data line minus (A conductor) |
Mandatory |
9 |
CNTR-N |
Repeater direction check |
Optional |
The two lines in two-wire cable transmit the signals: “Data line plus” (B conductor) and “Data line minus” (A conductor). These two conductors are different in colour: red or green. It is absolutely essential not to confuse these two conductors A and B in any one segment.
Red – B conductor (RxD/TxD-P)
B = red è BRED (or bread)
Green – A conductor (RxD/TxD-N)
The 5V supply must be able to deliver at least 100 mA and is used to supply the bus terminators. This supply is also often used by FOC converters or repeaters.
Wiring the 24V supply in the same connector is no longer recommended.
With all connectors, the shield must be applied to a large area of the protective ground. Connectors have been designed to allow this (see illustrations below). Pin 1 should no longer be used for protective ground.
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