ABB AC 800M

Tips on the most frequently asked installation issues Section 4 Commissioning of PROFIBUS
110 3BDS009029R5001 B
Tips on the most frequently asked installation issues
Are multiple devices with the default address 126, or with the same address
connected to the bus?
• Make certain that there are no instances of multiple devices on the bus
simultaneously with the same address. In case of doubt, attach one device after
the other to the bus and assign the address you desire to each device, with the
Web server of CI854(A). It is best to note the address on the device. If you
proceed according to this method in assigning the address, make certain you
can assign the installation location to the address.
Have you made note of the polarity for PROFIBUS DP?
• In contrast to PROFIBUS PA, you must ensure the correct polarity for
PROFIBUS DP. When using a 9-pin D-SUB connector, the connector
assignment is Pin No. 3 RxD/TxD-P (Receive/Transmit data-Plus) and Pin No.
8 RxD/TxD-N (Receive/Transmit data-N). If the question comes up, simply try
switching polarity.
Are the bus connections present and active?
• Make certain that the bus segments are present on both sides in each segment.
How can I get more specific information on how to start - relative to my
particular plant, application, and installed hardware?
• Contact PROFIBUS International (www.profibus.com) or your suppliers of
choice. Training courses, additional reference materials, and consulting
services are available to provide more detailed information on specific products
from the appropriate supplier.
Where do I get the specs?
• The specifications (and additional documents) are available from PROFIBUS
International. Standards documents are available from the IEC.