Communication Troubleshooting - Emerson Rosemount 3051SMV MultiVariable Reference Manual

Reference Manual
00809-0100-4853
physical damage to the isolator diaphragms, process fluid freezing, isolator corrosion due
to an incompatible process fluid, etc.
A transmitter with oil fill fluid loss may continue to perform normally for a period of time.
Sustained oil loss will eventually cause one or more of the operating parameters to exceed
published specifications as the operating point output continues to drift. Symptoms of
advanced oil loss and other unrelated problems include:
• Sustained drift rate in true zero and span or operating point output or both
• Sluggish response to increasing or decreasing pressure or both
• Limited output rate or very nonlinear output or both
• Change in output process noise
• Noticeable drift in operating point output
• Abrupt increase in drift rate of true zero or span or both
• Unstable output
• Output saturated high or low
5.4

Communication troubleshooting

Note
Use this section if other devices appear on the segment, communicate, and remain on the
segment. If other devices don't appear on the segment, communicate, or stay on the
segment the electrical characteristics of the segment should be checked.
Table 5-2: Troubleshooting Guide
Symptom
Device does not
show up on
segment
Device does not
stay on segment
Reference Manual
(1)
Recommended actions
Device power
• Cycle power to device.
• Ensure the device is connected to the segment.
• Check voltage at terminals. There should be 9–30 V or 17.5 V for FISCO.
• Check to ensure the device is drawing current. There should be
approximately 17 mA.
Segment
• Remove other devices from segment to check for interfering devices.
Incompatible network settings
• Change host network parameters. Refer to host documentation for
procedure.
Electronics failing
• Electronics board loose in housing.
• Replace electronics.
(2)
Signal levels
• Check for two terminators.
• Check for excess cable length.
• Check for bad power supply or conditioner.
Troubleshooting
January 2019
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