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Service Manual
Third edition, June 1997
Contact fault between Work Station and I/O Box or between I/O Box and
Level Unit.
• Check cable and connectors.
Serial port Com 1 or Serial Interface Board in Work Station faulty.
• Check Service window “Communication I/O Box” on Work Station.
See chapter 3.30.
The RS 485 Interface Board in location Com 4 in I/O Box faulty.
• Check that LEDs in I/O Box are flashing, see chapter 4.
Interface Board (LCI) in Level Unit faulty.
• See chapter 5.7.
9.1.3 SysFail message: Level Unit Power Failure.
Power failure to LI.
• Check status of LIs in Service window Level Unit: LI Status. See
chapter 3.16
• Check fuses in the Power Block (LP), see chapters 5.11 and 10.
9.1.4 SysFail message: Level Unit LI Communication Failed.
Contact fault on cable between Calculation Unit and Transmitter Interface
(LI).
• Check status of LIs in Service window Level Unit: LI Status. See
chapter 3.16.
• Check cables and connectors inside the Level Unit.
• Check if LCM is functioning, see chapter 9.1.7.
• Check setting of switch for addressing of the LI, see chapter 5.10.5.
Power failure to LI.
• See chapter 9.1.3 above.
LI faulty.
• Replace LI. If the system is equipped with more than one LI, try
exchanging the LIs. See chapter 5.10.8 “Replacing a Transmitter
Interface”. Check result.
9.1.5 SysFail message: I/O Box Communication Failed.
Mains power supply to I/O Box failing.
• Check that I/O Box has power and is running. See chapter 4.
Communication cables faulty.
• Open the cover and watch the LEDs on the main board at the bottom
of the box. See chapter 4.1.
• Check communication cables.
Serial Interface Board in Work Station faulty.
• Restart the Work Station (if more than one Work Station – restart the
Master Work Station) by pressing the Reset-button. See chapter 3.1.
9.1.6 Warning message: Level Unit Ground Failure.
Ground Failure on one or more LIs.
• Read chapter 9.14 for information on how to find the cause of the
ground failure.