WIRELESS HART FIELD DEVICE DATA AVAIL ABLE FO R M ODBU S M APPING
APPENDIX
64
4JNO0 0030 8 A
Appendix A.
Appendix
Appendix A.1
WirelessHART Field Device Data Available for
Modbus Mapping
The following data (see,
) is available from WirelessHART devices in the gateway. This
data is available for communication over ModbusTCP link.
Table 17: WirelessHART devices data available for Modbus mapping
Parameter
Register Length
Data Type
Description
Loop Current
2
Floating Point
Loop current of a device in the network
PV
2
Floating Point
Primary variable
SV
2
Floating Point
Secondary variable
TV
2
Floating Point
Tertiary variable
QV
2
Floating Point
Quarterly variable
PVStale
1
Unsigned 8-bit
Integer
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 If the PV value is outdated then the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.
SVStale
1
Unsigned 8-bit
Integer
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 If the SV value is outdated then the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.
TVStale
1
Unsigned 8-bit
Integer
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 If the TV value is outdated then the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.
QVStale
1
Unsigned 8-bit
Integer
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 If the QV value is outdated then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.
Device Status
1
Unsigned 8-bit
Integer
As specified in HART specification.
Battery Life
2
Floating Point
Remaining days for battery powered devices.
For line powered devices it is set to 65535.000
(decimal format).
Extended Device
Status
1
Unsigned 8-bit
Integer
Taken from Command 48 and is defined in
HART specifications’ Common Table 17.
Communication
Status
1
Unsigned 8-bit
Integer
Reported as 1 (device connected) &
0 (not connected)
Space in holding registers is reserved for device variable codes but are currently
not supported.
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