83
Reference Manual
00809-0100-4840, Rev CB
February 2015
A.1.10
Load limitations
A Field Communicator requires a minimum load resistance of 250 Ohm within the loop in order
to function properly. Communication with the Rosemount 3490 Series Controller does not
require additional resistance. The maximum load resistance can be determined from
.
Figure A-2. Load Limitations Charts
Note
R = Maximum Load Resistance.
U = External Power Supply Voltage.
U (V)
R (Ohms)
0
Non-intrinsically safe installations
Intrinsically safe installations
R (Ohms)
R (Ohms)
U (V)
U (V)
12
12
30
30
1244
800
400
12
20
24
53
3
Rosemount 3101
Rosemount 3102
0
1244
800
400
0
20
30
20
1244
800
400
0
Rosemount 3105
250
25
0
53
3
533
0
R (Ohms)
U (V)
12
40
Rosemount 3105
1244
800
400
0
20
30
2
50
533
40
Summary of Contents for Rosemount 3101
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