User's Manual

50
Reference Manual
00809-0300-4248, Rev AA
Appendix C: Mapping for non-DD based Integration with Host Systems
July 2014
Mapping for non-DD based Integration with Host Systems
C.2 Mapping of device variables index numbers
To integrate a device into the host system, it may be necessary to know what each device
variable represents, and what index number it has been assigned to. The variable index number
is an arbitrary number that is used to uniquely identify each variable that is supported in the field
device.
Tab le C -4 to Tab le C -5 displays the device variable and variable mapping indexes for the 648
Wireless transmitter.
Supply Voltage Low Byte 1 :: Bit 6
The supply voltage is low and may soon
affect broadcast updates
Electronics Temperature has
Exceeded Limits
Byte 1 :: Bit 3
The electronics temperature has exceeded
the transmitter's maximum range
(1) Location of the Alert in the HART command 48 Status field.
Table C-3. Advisory alerts (A:)
Message Additional status
(1)
(1) Location of the Alert in the HART command 48 Status field.
Description
Database Memory Warning Byte 0 :: Bit 2
The device has failed to write to the
database memory / Any data written during
this time may have been lost
Invalid Configuration Byte 2 :: Bit 6
The device has detected a configuration
error based on a change to the device
Button Stuck Byte :: Bit
A button on the Electronics Board is
detected as stuck in the active position
Simulation Active Byte 8 :: Bit 0
The device is in simulation mode and may
not be reporting actual information
Table C-4. Device variable index
Device variable index Description
0 Supply Voltage
1 Electronics Temperature
2 Process Temperature
3 Terminal Temperature (for CJC)
244 Percent of Range
Table C-5. Variable mapping
Process variables Mapped variable index
PV 2 - Process Temperature
SV 3 - Terminal Temperature
TV 1 - Electronics Temperature
QV 0 - Supply Voltage
Table C-2. Maintenance Alerts (M:)
Message Additional status
(1)
Description