Endress+Hauser WirelessHART Fieldgate SWG70 - Page 99

WirelessHART Fieldgate SWG70 Engineering
Endress + Hauser 99
Data block of HART devices, used in cyclic data transfer
This data structure is used for all WirelessHART field devices and HART devices within a
WirelessHART network. The WirelessHART devices must support HART Revision 7 or
higher. The HART field devices must support HART Revision 5 or 6. Not all values can be
used for HART-5 and HART-6 devices, and some values are replaced by other values. The
different behavior is described in the following table.
Data block of the HART devices
Structure Data type Size Invalid values Description
Device_struct 96
.PV REAL 4 Quiet NaN Primary Value (HART CMD 3/9/33)
.SV REAL 4 Quiet NaN Secondary Value (HART CMD 3/9/33)
.TV REAL 4 Quiet NaN Third Value (HART CMD 3/9/33)
.QV REAL 4 Quiet NaN Fourth Value
.PVStatus BYTE 1 0
Status byte (HART CMD 9)
1)
.SVStatus BYTE 1 0
Status byte (HART CMD 9)
1)
.TVStatus BYTE 1 0
Status byte (HART CMD 9)
1)
.QVStatus BYTE 1 0
Status byte (HART CMD 9)
1)
.PVUnit BYTE 1 0 Units Code (HART CMD 3/9/33)
.SVUnit BYTE 1 0 Units Code (HART CMD 3/9/33)
.TVUnit BYTE 1 0 Units Code (HART CMD 3/9/33)
.QVUnit BYTE 1 0 Units Code (HART 3/9/33)
.PVLowerRangeValue REAL 4 Quiet NaN Lower measuring range of the primary value
(HART CMD 15)
.PVUpperRangeValue REAL 4 Quiet NaN Upper measuring range of the primary value
(HART CMD 15)
Sub-structure DeviceStatus_Struct 4
.GeneralStatus BYTE 1
(always valid)
2)
.HARTCommFail BOOL HART communication error: device not found/HART
is not activated.
3)
See Chapter 10.5.7 "Diagnostic bits in cyclic data
exchange" on page 100.
.DescriptorNotUnique BOOL Indicates that the same HART descriptor has been
assigned to at least one other HART device. See
Chapter 10.5.7 "Diagnostic bits in cyclic data
exchange" on page 100.
.NoDataBurstConfigured BOOL Indicates that neither command 3, 9 nor 33 have been
configured to be sent by the HART device. See
Chapter 10.5.7 "Diagnostic bits in cyclic data
exchange" on page 100.
.NoCmd48BurstConfigured BOOL Indicates that command 48 has not been configured
to be sent by the HART device.
See Chapter 10.5.7 "Diagnostic bits in cyclic data
exchange" on page 100.
.PassThroughQueueOccupied BOOL Not used
.PassThroughResponseReady BOOL Not used
.UnusedStatus1 BYTE 1 Fix: 0x00
.FieldDeviceStatus BYTE 1
(always valid)
2)
Original status byte is returned by the device. For
more details see Page 98, "HART Device Status" Table.
.ExtendedFieldDeviceStatus BYTE 1 0x00
Original status byte is returned by the device.
4)
See device documentation.
Sub-structure Tag_Struct 32
(always valid)
2)
.Name BYTE[32] 32
HART Long Tag (ISO/IEC 8859-1)
5)
Sub-structure Cmd48_Struct 28
.Cmd48Data BYTE[25]
filled with 0x00
7)
CMD48 data
.Cmd48Reserved BYTE[3] Fill bytes