Quick Installation Guide
00825-0300-4728, Rev AA
July 2010
Rosemount 644
6
S
TEP
2
CONTINUED
...
Typical Configuration for Profibus Networking
NOTE
1. Each segment in a Profibus trunk must be terminated at both ends.
2. Some DP/PA couplers contain the power supply, one terminator, and the power
conditioner within the coupling device.
3. The configuration tool is typically located in the control room.
Ground the Transmitter
Ungrounded Thermocouple, mV, and RTD/Ohm Inputs
Each process installation has different requirements for grounding. Use the grounding
options recommended by the facility for the specific sensor type, or begin with grounding
Option 1 (the most common).
Option 1:
1. Connect sensor wiring shield to the transmitter housing.
2. Ensure the sensor shield is electrically isolated from surrounding fixtures that may be
grounded.
3. Ground signal wiring shield at the power supply end.
Profibus DP
RS-485 up to 12 MBd
PROFIBUS
Class 2
Master
(Configuration
Tool)
Terminators
6234 ft. (1900m) max
(Depending on cable characteristics)
Profibus PA
MBP-IS at 31.25KBd
Power/
Signal
Wiring
DP/PA
Coupler
Profibus Transmitter
Profibus Loop
Sensor Wires
Shield ground point
Transmitter
4728_Rev AA.fm Page 6 Thursday, July 29, 2010 11:41 AM
