Diagnosing And Troubleshooting; Communication Troubleshooting - Siemens SITRANS L Operating Instructions Manual

Diagnosing and troubleshooting

9.1

Communication Troubleshooting

1. Check the following:
– There is power at the instrument.
– The LCD shows the relevant data.
– The device can be programmed using the handheld programmer.
– If any fault codes are being displayed see General fault codes (Page 143) for a detailed
2. Verify that the wiring connections are correct.
3. Check the PROFIBUS address and make sure all devices are at unique PROFIBUS addresses.
4. See the table below for specific symptoms.
Symptom
The device cannot be programmed via the
handheld programmer.
You try to set a SITRANS LR200 parameter via
remote communications but the parameter re-
mains unchanged.
The PLC value equals the display value but does
not correspond to actual material level.
The PLC value is not equal to the displayed value
(regardless of actual material level).
If you continue to experience problems, go to our website at: www.siemens.com/LR200
(www.siemens.com/LR200), and check the FAQs for SITRANS LR200, or contact your Siemens
representative.
142
list.
Corrective action
• Ensure Write Protection (6.2.1.) is set to the
unlock value.
• Ensure Remote Lockout (6.1.1.) is disabled.
• Ensure Write Protection (6.2.1.) is set to the
unlock value
• Navigate to Master Reset (4.1.) and select
Reset Address to 126 to disable an address
lock.
• Ensure Scaling in AIFB1 is correctly entered.
• Ensure High Calibration Point is correctly en-
tered.
• View the echo profile to see if the wrong echo
is being selected. If so, see Operation trouble-
shooting (Page 147) for possible causes and
corrective action.
• Confirm you are looking at the right spot in
the PLC.
• Ensure scaling has not been programmed into
the PLC: all scaling should be performed by
the LR200.
• Check the network to ensure the PCL is com-
municating with the LR200.
SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF
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