Siemens 7ML5431 - Diagnosing and Troubleshooting; Communication Troubleshooting; Device Status Icons

SITRANS LR250 with mA/HART
Operating Instructions, 10/2019, A5E32220602-AG
167
Diagnosing and troubleshooting
10
10.1 Communication troubleshooting
1. Check the following:
– There is power at the device.
– 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 169) for a
detailed list.
2. Verify that the wiring connections are correct.
3. See the table below for specific symptoms.
Symptom
Corrective action
The device cannot be programmed via the
handheld programmer.
• Ensure
Write Protect (6.2.1.)
is set to the unlock
value.
You try to set a SITRANS LR250 parame-
ter via remote communications but the
parameter remains unchanged.
• Ensure
Write Protect (6.2.1.)
is set to the unlock
value, then try setting the parameter via the handheld
programmer.
• Ensure
Access Control (6.1.1.)
is set to Read/ Write.
• Some parameters can be changed only when the
device is not scanning. Try pressing Mode
to put
the device into PROGRAM mode.
If you continue to experience problems go to our website and check the FAQs for SITRANS
LR250:
Product page (http://www.siemens.com/LR250
), or contact your Siemens representative.
10.2 Device status icons
Icon
Priority
Level
Meaning
1
• Maintenance alarm
• Measurement values are not valid
2
• Maintenance warning: maintenance demanded immediately
• Measured signal still valid