WirelessHART Fieldgate SWG70
Engineering
E 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