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 differential 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 figure shows the mounting position and the designation of the connector on the
module.
Figure 7-6 PROFIBUS DP interface
7.9.2 PROFIBUS cables and connectors
Cable specification
The PROFIBUS cable is 2-wire, twisted, and shielded with defined technical data.
Table 7-14 Cable specification for X126
Characteristics Version
Connector type 9-pin SUB-D socket
Cable type PROFIBUS cable
Max. cable length 100 m at 12 Mbit/s
Connecting
7.9 PROFIBUS DP
NCU 1760
70 Equipment Manual, 02/2020, A5E45627861B AB
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