WirelessHART Fieldgate SWG70 Engineering
Endress + Hauser 97
10.5.6 Connection parameters for cyclic data exchange
Data block of WirelessHART Fieldgate, used in cyclic data transfer
The format of the data block of the WirelessHART Fieldgate which is transmitted in the first
position of the first connection is as follows.
Data block of the WirelessHART Fieldgate
The statistics values marked with 1) are only invalid if the WirelessHART Fieldgate has been
started and the statistics values have not yet been calculated. The statistics values remain
valid for as long as the WirelessHART Fieldgate is in operation.
Structure Data type Size Invalid values Description
Gateway_struct 84
.NetworkReliability_percent REAL 4
Quiet NaN
1)
Percentage of the packets generated by wireless
devices that were correctly received by the
WirelessHART Fieldgate.
.NetworkStability_ratio REAL 4
Quiet NaN
1)
Ratio of successfully transmitted packets to all the
packets transmitted on all the wireless connections
.NetworkLatency_ms DINT 4
–1
1)
Average time required for the packets generated by a
wireless device to the WirelessHART Fieldgate
.LostUpstreamPackets DINT 4
–1
1)
Total number of packets that have been lost during
transmission by a wireless device
Sub-structure DeviceStatus_Struct 4 (always valid)
.GeneralStatus BYTE 1
.InternalError BOOL Displays an internal error.
The values ".NetworkReliability_percent",
".NetworkStability_ratio", ".NetworkLatency_ms" and
".LostUpstreamPackets" are set to an invalid value and
the "HART Comm Fail" bit of all the devices is flagged.
.DescriptorNotUnique BOOL The same HART descriptor has been assigned for at
least two HART devices.
This is an aggregate bit for all the HART devices. See
Chapter 10.5.7 "Diagnostic bits in cyclic data
exchange" on page 100.
.NoDataBurstConfigured BOOL Indicates that at least one HART device in cyclic data
exchange has not flagged command 3, 9 or 33. See
Chapter 10.5.7 "Diagnostic bits in cyclic data
exchange" on page 100.
.NoCmd48BurstConfigured BOOL Indicates that at least one HART device in cyclic data
exchange has not flagged command 48. 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
.FieldDeviceStatus BYTE 1 Original status byte returned by WirelessHART
Fieldgate. For more details see Page 98, "HART Device
Status" Table.
.ExtendedDeviceStatus BYTE 1 Original status byte returned by WirelessHART
Fieldgate. For more details see Page 98, "HART
Extended Device Status" Table.
Sub-structure Tag_Struct 32 (always valid)
.Name BYTE[32] 32 HART Long Tag (ISO/IEC 8859-1)
Sub-structure CMD48_Struct 28 (always valid)
.Cmd48Data BYTE[25] CMD 48 data
.Cmd48Reserved BYTE[3] Fill bytes
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