Appendix C: Troubleshooting; Communication Troubleshooting; Generally; Specifically - Siemens SITRANS LR250 Instruction Manual

Appendix C: Troubleshooting

Communication Troubleshooting

Generally:

1. Check the following:
• There is power at the instrument
• The LCD shows the relevant data
• The device can be programmed using the hand programmer
2. Verify that the wiring connections are correct.
3. If you continue to experience problems, go to our website at:
. www.siemens.com/processautomation, and check the FAQs for SITRANS LR250, or
contact your local Siemens Milltronics representative.

Specifically:

1. If you try to set a SITRANS LR250 parameter via remote communications, but the
parameter remains unchanged:
• Some parameters can only be changed when the device is not scanning. Try
putting the device in PROGRAM mode using the operating mode function.
• Try setting the parameter from the keypad. (First make sure that the lock
parameter [6.1] is set to the unlock value.)
• The communications control parameter 5.2 must be set to 1 to allow you to write
parameters to SITRANS LR250.
2. If you see unanticipated displays, for example:
• PROGRAM mode displayed instead of Measurement mode
• the wrong parameter displayed in response to a command
• a parameter displayed in response to no command
make sure no infrared-capable device is close to SITRANS LR250. Any device with
infrared capabilities (laptops, cell phones, PDAs) can cause interference which
simulates a command to the SITRANS LR250, potentially causing it to switch modes
or to change a parameter.
3. If the operation is erratic, make sure the Hand Programmer is not being used at the
same time as SIMATIC PDM.
7ML19985JE01 SITRANS LR250 (HART) – INSTRUCTION MANUAL Page 97