Emerson Micro Motion FDM User Manual

4.3 Processor wiring for remote-mount 2700
fieldbus
4.3.1 RS-485 entity parameters for remote-mount 2700
fieldbus
DANGER
• Hazardous voltage can cause severe injury or death. To reduce the risk of hazardous
voltage, shut off power before wiring the meter.
• Improper wiring in a hazardous environment can cause an explosion. Install the
meter only in an area that complies with the hazardous classification tag on the
meter.
Table 4-2: RS-485 output and cable entity parameters
Cable parameters for intrinsically safe circuit (linear)
Voltage (U
i
) 17.22 VDC
Current (I
i
) 484 mA
Maximum capacitance (C
i
) 1 nF
Maximum inductance (L
i
) Negligible
Cable parameters for Ex ib IIB, Ex ib IIC
Voltage (U
o
) 9.51 VDC
Current (instantaneous) (I
o
) 480 mA
Current (steady state) (I) 106 mA
Power (P
o
) 786 mW
Internal resistance (R
i
) 19.8 Ω
Cable parameters for Group IIC
Maximum external capacitance (C
o
) 85 nF
Maximum external inductance (L
o
) 25 µH
Maximum external inductance/resistance ratio
(L
o
/R
o
)
31.1 µH/Ω
Cable parameters for Group IIB
Maximum external capacitance (C
o
) 660 nF
Maximum external inductance (L
o
) 260 µH
Maximum external inductance/resistance ratio
(L
o
/R
o
)
124.4 µH/Ω
Installation Manual Wiring
MMI-20020989 May 2019
Installation Manual 43

Emerson Micro Motion FDM Specifications

General

Brand	Emerson
Model	Micro Motion FDM
Category	Measuring Instruments
Language	English