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Reference Manual
IP2048/RM, Rev AA
Appendix A: Reference Data
February 2015
Figure A-2. Load limitations
A Field Communicator requires a minimum load resistance of 250 Ohm within the loop in order to function properly.
Communication with Mobrey MCU900 Series Control Unit does not require additional resistance. The maximum load resistance
can be determined from these diagrams:
Non-Intrinsically Safe Installations
Intrinsically Safe Installations
R (Ohms)
R (Ohms)
U (V)
U (V)
12
12 30
40
Mobrey MSP900GH
1244
800
400
0
20 30
20
1244
800
400
0
Mobrey MSP900GH
250
250
533
533
0
24
24
18
18
Note:
R = Maximum Load Resistance
U = External Power Supply Voltage
R (Ohms)
U (V)
12
30
20
1244
800
400
0
0
250 533
24
18
Mobrey MSP400RH
40