ABB AC 800M User Manual page 106

Testing the PROFIBUS bus cable and bus connectors
PIN
6
7
8
9
Use an ohmmeter to check the static characteristics of the ready made cable:
•
•
•
•
•
•
•
•
•
In the values above we have unattended the loop resistance of typical 110 Ohm/km
Figure 40. Schematic diagram of testing the PROFIBUS cable
106
Table 10. PROFIBUS DP Connector
Designation
VP
–
RxD/TxD-N
DGND
Passage on pin 3 between all PROFIBUS connectors.
Passage on pin 8 between all PROFIBUS connectors.
Insulation between pin 3 and pin 8 with bus termination switched off.
one bus termination switched on é around 390 ohms between pin 3 and 6
both bus terminations switched on é around 195 ohms between pin 3 and 6
one bus termination switched on é around 220 ohms between pin 3 and 8.
both bus terminations switched on é around 110 ohms between pin 3 and 8
one bus termination switched on é around 390 ohms between pin 8 and 5
both bus terminations switched on é around 195 ohms between pin 8 and 5
Section 4 Commissioning of PROFIBUS
+5 V, supply voltage for terminating resistors
Not Used
Receive/Transmit Data N-line (A-line, green)
Digital Ground
Description
3BDS009029R5001 B