KROHNE M8E User Manual
Supplementary Installation
and Operating Instructions
HART
HART/Field Communicator 275/375
Asset Management Solutions (AMS)
Process Device Manager (PDM)
M8E
1 General Information 3
1.1 Point-to-Point Analog/Digital Mode 3
1.2 Multidrop Mode 4
1.3 Multidrop Mode (‘three-wire’) 5
2 IDs and Revision numbers 5
3 Implementation Peculiarities 6
4 HART/Field Communicator 275/375 (HC275/FC375) 6
4.1 Installation 6
4.2 Operating 6
5 Asset Management Solutions (AMS) 7
5.1 Installation 7
5.2 Operating 7
6 Process Device Management (PDM) 7
6.1 Installation 7
6.2 Operating 7
1 General Information
The M8E is a two-wire transmitter with 4...20mA current output and HART capability.
General Characteristics of the M8E HART interface:
• Multidrop Mode is supported
• Burst Mode is not supported
There are two way s of using the HART communication:
1.1 Point-to-Point Analog/Digital Mode
a) As a point -to-point connection between the M8E and the HART master equipment.
1.2
Point-to-Point Analog/Digital Mode
Primary Master
Power
Supply
For slaves with
passive current
output (2 wire)
≥ 250 Ohm
SecondaryMaster
HART
Modem
HART
Analog
mA
4 20
4...20 mA
M8E
Addr. 0
Multidrop Mode
b) As a multipoint connection (multidrop) with up to 15 devices (M8E or other HART equipment) in parallel.
Multidrop Mode
PrimaryMaster
HART
Modem
HART
Power
Supply
≥ 250 Ohm
4 mA 4 mA
Secondary Master Up to 15
M8E
Addr. > 0
(passive current output)
. . .
Slaves
. . .
M8E
Addr. > 0
(passive current output)
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