PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke

PROFIBUS hardware installation
B.2. Connection of bus stations
When connecting the bus cable to the bus stations, make
sure not to twist the data lines.
Use pins 3 and 8 for communication connections to partner
stations:
Tip: Make a basic all-time decision as to which colour
core is to be used for the data lines.
We recommend:
Pin Function Colour
3 RXD/TXD-P red or white (lighter colour)
8 RXD/TXD-N green or brown (darker colour)
Both terminating stations are to be connected to a bus terminator
(see chapter "B.2.1.2. Bus termination").
B.2.1. Bus cable connectors
There are various types of bus cables connectors available.
The basic distinction is to be made between bus nodes – interfacing
between two bus stations – and bus terminators –
for terminating bus stations.
Terminal stat. Profi I/O 690E+ further stations
6 7 8 9
1 2 3 4 5
Bus termination
required!
6 7 8 9
1 2 3 4 5
Bus node
RxD/TxD-N
RxD/TxD-P
Shield
Ill.: Bus network consisting of at least 3 stations
B - 5