YSI DIQ/S 182-PR System 182 - Manual (Page 111)

System 182 PROFIBUS connection
7 - 1 ba76024e01 02/2012
7 PROFIBUS connection
Note
Detailed information on the subject of PROFIBUS is given on the
Internet by the PROFIBUS user organization (PNO) under
www.profibus.com.
7.1 PROFIBUS checklist
The following checklist supports you when planning, projecting and
installing a PROFIBUS plant with the IQ S
ENSOR N ET . For smooth
operation, you should be able to answer all questions with "Yes".
 Is the [bus system] (bus segment) installed without branch lines?
 Was the correct PROFIBUS cable used (cord type A according to
EN 50170)?
 Are the poles of the signal lines A line and B line correctly connected
at all bus connections?
 Is it guaranteed that there is no short-circuit between A line, B line
and cable shielding?
 Is the shielding installed free of interruptions?
 Are the guidelines for shielding and grounding being observed, and
doesn't any unallowed potential equalization current flow
via the shielding?
 Is the maximum cable length (per bus segment) observed for the
corresponding baud rate?
 Do all devices support the required baud rate?
 With 12 Mbit/s transmission rate only: Are the bus plugs suitable for
this baud rate?
 Are exactly two terminators switched on at the ends of the [bus
system] (bus segment)?
 Are the terminators supplied with voltage so the following applies:
U
B line
- U
A line
> + 500 mV?
 Do all devices have individual bus addresses?
 After changing the bus address, have the devices been restarted
(switched off and on again)?
Note: The DIQ/S 182-PR does not have to be restarted.
 Do the addresses projected in the master correspond to the actual
addresses? Are all addresses less than or equal to the parameter
HSA and less than 126 (HSA = Highest Station Address)?
 Is the currently valid GSD being used? If you are in doubt, download
it from the Internet.