YSI DIQ/S 182 XT-4-PR - Manual (Page 117)

System 182 XT-4 PROFIBUS connection
7 - 1 ba76027e01 02/2012
7 PROFIBUS connection
Note
Detailed information on the PROFIBUS subject is provided on the
Internet by the PROFIBUS-Nutzerorganisation e.V. (PNO - Profibus
user organization) 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 XT-4-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.