Endress+Hauser PROFI BUS Proline Promag 53 PROFIBUS DP Operating Manual page 136

Troubleshooting
136
Fieldbus connection PROFIBUS PA: Check data line
Terminal 26 = PA +
Terminal 27 = PA -
PROFIBUS DP: Check data line
Terminal 26 = B (RxD/TxD-P)
Terminal 27 = A (RxD/TxD-N)
Faulty connection to control system (continued)
Fieldbus connector • Check pin assignment/wiring
(only for PROFIBUS PA) • Check connection between connector/fieldbus port.
Is the coupling ring tightened correctly?
Fieldbus voltage Check that a min. bus voltage of 9 V DC is present at terminals 26/27. Permissible range: 9
(only for PROFIBUS PA) to 32 V DC
Network structure Check permissible fieldbus length and number of spurs.
Basic current Is there a basic current of min. 11 mA?
(only for PROFIBUS PA)
Bus address Check bus address: make sure there are no double assignments
Bus termination Has the PROFIBUS network been terminated correctly?
Each bus segment must always be terminated with a bus terminator at both ends (start and
finish). Otherwise there may be interference in communication.
Power consumption, Check the current consumption of the bus segment:
permitted feed current The current consumption of the bus segment in question (= total of basic currents of all bus
(only for PROFIBUS PA) users) must not exceed the max. permissible feed current of the bus power supply.
System or process error messages
System or process errors which occur during commissioning or operation can also be displayed in the manufacturer-
specific device controls using the FieldCare operating program.
Other error (without error message)
Diagnosis and rectification → Page 148
Other errors are present
Proline Promag 53 PROFIBUS DP/PA
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Endress+Hauser