5.4 Engineering Assistant communication
troubleshooting
Table 5-3 identifies the most common communication issues between the Engineering
Assistant software and the Rosemount 3051SMV.
Table 5-3: Corrective Action for Engineering Assistant Communication Problems
Symptom Corrective action
No Communication
between the
Engineering Assistant
software and the
Rosemount 3051SMV
Loop wiring (HART)
• HART protocol communication requires a loop resistance value
between 250 to 1321 ohms, inclusive.
• Check for adequate voltage to the transmitter. See Load limitations.
• Check for intermittent shorts, open circuits, and multiple grounds.
• Check for capacitance across the load resistor. Capacitance should be
less than 0.1 microfarad.
Engineering Assistant
• Verify correct COM port selected.
• Verify laptop computer is not in low energy mode (certain laptops
disable all COM ports in low energy mode).
• Check if HART modem is properly connected.
• Check if HART driver is loaded and installed. If using a HART USB port
modem, install drivers from CD-ROM provided with USB modem.
• Check if another HART configuration program, such as AMS Device
Manager, is currently open. Only one HART configuration program
may be opened at a time.
• Verify the COM port buffer setting is set to the lowest setting (1) in
the advanced COM port settings and re-boot the computer.
• Set the Device Address to search All.
5.5 Measurement troubleshooting
The transmitter provides a means to display the current process variables and flow
calculations. If the process variable reading is unexpected, this section provides the
symptoms and possible corrective actions.
Table 5-4: Unexpected Process Variable (PV) Readings
Symptom Corrective action
High PV Reading Primary element
• Check for restrictions at the primary element.
• Check the installation and condition of the primary element.
• Note any changes in process fluid properties that may affect output.
Impulse piping
Reference Manual Troubleshooting
00809-0100-4803 October 2018
Emerson.com/Rosemount 137
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