Pin Signal name Signal type Meaning
6 P5EXT VO 5 V power supply for bus termination, external, short-circuit
proof
7 P24_SERV VO 24 V for teleservice, short-circuit proof, 150 mA maximum
8 1XRS_DP B RS-485 dierential signal
9 - - Reserved, do not use
The P5EXT voltage is provided exclusively to supply the bus termination.
Signal type: VO = Voltage output (power supply); O = Output, B = Bidirectional
Position of the connector
The following gure shows the mounting position and the designation of the connector on the
module.
Figure 8-6 PROFIBUS DP interface
Connecting
8.9 PROFIBUS DP
NCU 1740
74 Equipment Manual, 10/2021, A5E51087503B AA
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