KROHNE MFC 400 EN - Manual (Page 134)

9
DESCRIPTION OF HART INTERFACE
134
MFC 400
www.krohne.com 08/2013 - 4002075802 - MA MFC 400 R02 en
Description of HART interface
9.1 General description
The open HART ® protocol, which can be used freely, is integrated into the signal converter for
communication.
Devices which support the HART ® protocol are classified as either operating devices or field
devices. When it comes to operating devices (Master), both manual control units (Secondary
Master) and PC-supported workstations (Primary Master) are used in, for example, a control
centre.
HART ® field devices include measuring sensors, signal converters and actuators. The field
devices range from 2-wire to 4-wire to intrinsically safe versions for use in hazardous areas.
The HART ® data are superimposed over the analogue 4...20 mA signal via FSK modem. This way,
all of the connected devices can communicate digitally with one another via the HART ® protocol
while simultaneously transmitting the analogue signals.
When it comes to the field devices and secondary masters, the FSK or HART ® modem is
integrated, whereas with a PC communication takes place via an external modem which must be
connected to the serial interface. There are, however, other connection variants which can be
seen in the following connection figures.
9.2 Software History
HART ® identification codes and revision numbers
INFORMATION!
In the table below, "x" is a placeholder for possible multi-digit alphanumeric combinations,
depending on the available version.
Release date Electronic
Revision HART ®
Device Revision DD Revision
2012-xx-xx 1.0.0 1 1
Manufacturer ID: 69 (0x45)
Device: 204 (0xCC)
Device Revision: 1
DD Revision: 1
HART ® Universal Revision: 7
FC 375/475 system SW.Rev.: ≥ 3.3
AMS version: ≥ 8.0
PDM version: ≥ 6.0
FDT version: ≥ 1.2
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