Siemens sitrans PROBE LU User Manual

Page 40 SITRANS Probe LU (PROFIBUS PA)– INSTRUCTION MANUAL 7ML19985JB02
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B: Troubleshooting
Appendix B: Troubleshooting
1. Check the following:
• There is power at the instrument.
• The LCD shows the relevant data.
• Check whether any fault codes are being displayed (see
Acyclic Extended
Diagnostics (General Fault Codes) on page 30 for a detailed list).
• The device can be programmed using the handheld programmer.
2. Verify that the wiring connections are correct.
3. Check the PROFIBUS address and make sure all devices are at unique PROFIBUS
addresses.
4. If you are unable to program the device via the handheld programmer, make sure
local operation is enabled (see
Local operation enable on page 44). Also make sure
that Write Locking is Off (see Write locking on page 45).
5. If you try to set a SITRANS Probe LU parameter via remote communications, but the
parameter remains unchanged, make sure remote operation is enabled (see
Remote operation enable on page 45). Also make sure that Write Locking is Off (see
Write Locking on page 76).
6. If you continue to experience problems, go to our website at www.siemens.com/
processautomation, and check the FAQs for SITRANS Probe LU, or contact your
Siemens representative.
7. If the PLC value equals the display value, but does not correspond to actual material
level, either:
• scaling in AIFB1 is incorrect, or
• High Calibration Point is incorrectly entered, or
• the wrong echo is being selected.
8. If the PLC value is not equal to the displayed value (regardless of actual material
level), either:
• you may not be looking at the right spot in the PLC, or
• you may have programmed scaling into the PLC, instead of leaving all scaling to
be performed in the Probe LU, or
• the PCL may not be communicating with the Probe LU. Check the network to
verify that you are communicating.
General Fault Codes
For a table listing the fault codes, meanings, and suggested corrective action to take,
please see
Acyclic Extended Diagnostics (General Fault Codes) on page 30.

Siemens sitrans PROBE LU Specifications

General

Measuring Principle	Ultrasonic
Communication	HART
Output	4 to 20 mA
Power Supply	12 to 30 V DC
Process Temperature	-40 to 80 °C
Enclosure Rating	IP68
Material	PVDF
Ambient Temperature	-40 to 70 °C
Measurement Range	0.25 to 12 m (0.8 to 39 ft)