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Appendix A. Appendix
Appendix A.1 WirelessHART Field Device Data Available for
The following data (see,
data is available for communication over ModbusTCP link.
Parameter
Loop Current
PV
SV
TV
QV
PVStale
SVStale
TVStale
QVStale
Device Status
Battery Life
Extended Device
Status
Communication
Status
Modbus Mapping
Table
17) is available from WirelessHART devices in the gateway. This
Space in holding registers is reserved for device variable codes but are currently
not supported.
Table 17: WirelessHART devices data available for Modbus mapping
Register Length
Data Type
2
Floating Point
2
Floating Point
2
Floating Point
2
Floating Point
2
Floating Point
Unsigned 8-bit
1
Integer
Unsigned 8-bit
1
Integer
Unsigned 8-bit
1
Integer
Unsigned 8-bit
1
Integer
Unsigned 8-bit
1
Integer
2
Floating Point
Unsigned 8-bit
1
Integer
Unsigned 8-bit
1
Integer
Description
Loop current of a device in the network
Primary variable
Secondary variable
Tertiary variable
Quarterly variable
This variable is set to '1', meaning NEW, if the
last recorded PV value was received within 3
times the burst period of command 3 set in
that device. If the PV value is outdated then the
value is set to '0', meaning OLD data.
This variable is set to '1', meaning NEW, if the
last recorded SV value was received within 3
times the burst period of command 3 set in
that device. If the SV value is outdated then the
value is set to '0', meaning OLD data.
This variable is set to '1', meaning NEW, if the
last recorded TV value was received within 3
times the burst period of command 3 set in
that device. If the TV value is outdated then the
value is set to '0', meaning OLD data.
This variable is set to '1', meaning NEW, if the
last recorded QV value was received within 3
times the burst period of command 3 set in
that device. If the QV value is outdated then
the value is set to '0', meaning OLD data.
As specified in HART specification.
Remaining days for battery powered devices.
For line powered devices it is set to 65535.000
(decimal format).
Taken from Command 48 and is defined in
HART specifications' Common Table 17.
Reported as 1 (device connected) &
0 (not connected)
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