Constructing the Bus Cable for the PROFIBUS DP
 
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Overview
The bus cable for connecting PROFIBUS DP devices must be constructed by the user.
A special PROFIBUS cable (2 conductor, shielded) is required, this is available as an individual item from Schneider among others, see Ordering Details for PROFIBUS DP Components. Furthermore, three different Connector are available.
Constructing the Bus Cable
To construct the cable, proceed as follows:
Step
Action
1
Cut the cable to the required length.
2
Prepare the cable ends as shown in the illustration (dimensions in mm): 
J
PVC jacket 
S
Braided shielding
3
Remove the PVC jacket J to the length shown.
4
Wrap the supplied copper foil shielding F round the shielded braiding S: 
J
PVC jacket 
S
Braided shielding 
F
Copper foil shielding
Additional foil can be obtained from 3 M, see Ordering Details for PROFIBUS DP Components.
5
Plug the leads of the corresponding cable(s) into the terminals as shown:
  • Green lead in terminal A
  • Red lead in terminal B
Note: Do not screw the corresponding screws in yet.
Connection terminal assignment on the PROFIBUS DP (example: 490 NAD 911 04 PROFIBUS connector): 
A
Incoming cable KAB PROFIB 
B
Outgoing cable KAB PROFIB (not available with 490 NAD 911 03) 
C
Connection terminals (only once (B,A) with 490 NAD 911 03) 
D
Cable cleat for relieving weight 
E
Bus connector screws
6
Attach the cables with the available cable cleat to create a robust shielded connection and relieve weight as shown: 
J
PVC jacket 
S
Braided shielding with foil shielding 
C
Cable cleat
Note: Half of the cable jacket must lie under the cable cleat.
Pay attention to the installation direction of the cable cleat.
7
The shielding of the two cables are each internally connected with the metal housing of the connector.
8
Close the connector housing.
9
Perform the central discharge function for the shielding in accordance with Central Discharge Function for the PROFIBUS DP, before connecting the bus cable to the modules.
10
Plug the PROFIBUS DP connector into the corresponding module and secure it with the screws.
Start of Bus and End of Bus
The PROFIBUS connector with termination (490 NAD 911 03) is required for the start and end of the bus. These connectors emulate the line impedance.
It is recommended that at least one connector with diagnostics interface (490 NAD 911 05) is used.
Wiring diagram for a PROFIBUS DP cable