KROHNE MFC 300 EN - Manual (Page 147)

DESCRIPTION OF HART INTERFACE
9
147
MFC 300
www.krohne.com 02/2012 - 4000498602 - MA MFC 300 R03 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 sensors, 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 transferring the analogue signals.
When it comes to the field devices and manual control units, the FSK or HART ® modem is
integrated. With a PC, however, communication takes place via an external modem which must
be connected to the serial interface. There are also other connection variants, as shown in the
following connection diagrams.
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 SW.REV.UIS SW.REV.MS HART ®
Device
Revision DD Revision
- - 2.x.x 1.x.x 1 1 (only AMS)
- - 2.x.x 1.x.x 1 2
2008-06-20 3.3.x 3.3.x 3.0.x 2 3
Manufacturer ID: 69 (0x45)
Device: 221 (0xDD)
Device Revision: 2
DD Revision 3
HART ® Universal Revision: 5
FC 375/475 system SW.Rev.: ≥ 1.8
AMS version: ≥ 7.0
PDM version: ≥ 6.0
FDT version: ≥ 1.2
.book Page 147 Monday, February 6, 2012 11:01 AM