KROHNE FMCW06G10 Manual De Usuario

DESCRIPTION OF HART INTERFACE

OPTIWAVE 1010

www.krohne.com

09/2014 - 4003537401 - MA OPTIWAVE 1010 R01 en

9.1 General description

The HART

Protocol is an open digital communication protocol for industry. It is free to use by

anyone. It is included in the software embedded in signal converters of HART-compatible
devices.

There are 2 classes of devices which support the HART

Protocol: operating devices and field

devices. There are 2 classes of operating devices (Master): PC-supported workstations (Primary
Master) and manual control units (Secondary Master). These can be used in control centres and
other locations. HART

field devices include sensors, converters and actuators. Field devices

include 2-wire and 4-wire devices, and also intrinsically-safe versions for use in hazardous
areas.

There are 2 primary operation modes for HART-compatible devices: point-to-point mode and
multi-drop mode.

If the device is used in point-to-point mode, the HART

Protocol uses the Bell 202 Frequency

Shift Keying (FSK) standard to put a digital signal on top of the 4...20 mA signal. The connected
device sends and receives digital signals that agree with the HART

Protocol, and sends analog

signals at the same time. Only 1 device can be connected to the signal cable.

If the device is used in multi-drop mode, the network only uses a digital signal that agrees with
the HART

Protocol. The loop current is set to 4 mA. You can connect a maximum of 15 devices

to the signal cable.

An FSK or HART

modem is included in field devices and manual control units. It is necessary to

have an external modem for PC-supported workstations. The external modem is connected to
the serial interface.

9.2 Software description

HART

identification codes and revision numbers

9.3 Connection variants

The signal converter is a 2-wire device with 4...20 mA current output and HART

interface.

• Multi-Drop Mode is supported

In a Multi-Drop communication system, more than 1 device is connected to a common
transmission cable.

Manufacturer ID:

0x45

Device:

0xBF

Device Revision:

DD Revision

HART

Universal Revision:

FC 375/475 system SW.Rev.:

≥ 2.0

AMS version:

≥ 7.0

PDM version:

≥ 6.0

FDT version:

1.2