Emerson Rosemount 3095, Reference Manual, Page: 108 / 130

Reference Manual
00809-0100-4716, Rev JA
May 2008
Rosemount 3095 MultiVariable
5-2
EA COMMUNICATION
TROUBLESHOOTING
Alarm Abbreviations
Table 5-1 shows standard alarm abbreviations used in Appendix C: Critical
Alarms for Previous Software Revisions.
Table 5-1. Alarm Abbreviations
Corrective Action
Table 5-2 identifies the most likely causes for communication problems
between the Engineering Assistant (EA) software and the
Rosemount 3095.
Table 5-2. Corrective Action for
EA Communication Problems
Abbreviation Definition
LOL Lower Operating Limits (customer specified using the EA)
UOL Upper Operating Limits (customer specified using the EA)
LRL Lower Range Limits
URL Upper Range Limits
LRV Lower Range Value
URV Upper Range Value
URL+ URL + (10%URL) (For example, URL+ = 250 + (0.10 250) = 275
LRL– LRL – (10%LRL) (For example, LRL– = –250 –[0.10 (250)] = –275
Symptom Corrective Action
No Communication
between the EA
Software and the
Rosemount 3095
Loop Wiring (HART)
• HART protocol communication requires a loop resistance value between 250–1100 ohms, inclusive.
• Check for adequate voltage to the transmitter. (If the computer is connected and 250 ohms resistance is properly
in the loop, a power supply voltage of at least 16.5 V dc is required.)
• Check for intermittent shorts, open circuits, and multiple grounds.
• Check for capacitance across the load resistor. Capacitance should be less than 0.1 microfarad.
EA for HART Installation
• Verify that the install program modified the CONFIG.SYS file.
• Verify computer reboot followed EA-HART installation.
• Verify correct COMM port selected.
• Verify laptop computer is not in low energy mode
(certain laptops disable all COMM ports in low energy mode).
• Check if HART driver is loaded and installed. If using a HART USB port modem, install drivers from CD-ROM
provided with USB modem.
• EA for HART cannot be open simultaneously with EA for F OUNDATION fieldbus. Proper communications require
closing the EA for F OUNDATION fieldbus program.
Verify the receive buffer computer setting is set to the lowest setting (1) in the advanced COM port settings and
re-boot the computer.
Loop Wiring (F OUNDATION Fieldbus)
• Fieldbus protocol communications requires a conditioned supply with two terminators on the bus.
• Check for adequate voltage to the tranmsitter. It must have at least 9 volts across the terminals.
• Check for intermittent shorts and open circuits.
Verify neither terminal is grounded. Fieldbus protocol does not allow either side of the bus segment to be grounded
EA for F
OUNDATION
Fieldbus Installation
• Verify computer reboot followed by the EA-Fieldbus installation.
• Verify PCMCIA card drivers are properly installed.
• EA for HART connot be open simultaneously with EA for F
OUNDATION
fieldbus. Proper communications require
closing the EA for HART program.