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Reference Manual
00809-0200-4420, Rev HC
Section 5: Operation and Maintenance
July 2015
Operation and Maintenance
3. Repeat for each new data point.
4. Select Submit.
Address: This is the Modbus RTU address used by the Gateway for this data point. It is possible
to group data points assigning them the same address (i.e. all data points from the same
process unit can have the same address). This column only appears if Multiple Modbus
Addresses is selected on the Modbus Communications page.
Register: This is the Modbus register number used for this data value. Modbus registers hold
two bytes (16 bits) of information; therefore 32 bit floats and integers require two Modbus
registers. Each data point needs a unique Modbus register number, unless they are assigned
different addresses. Register numbers 0-19999 are reserved for Boolean (bit, coil, binary, etc…)
values. Register numbers 20000+ are reserved for floating point or integer values.
Point Name: This is a two part name for the data point. The first part is the HART Tag of the
wireless field device which is producing the data. The second part is the parameter of the
wireless field device.
Note
Point Name is entered as <HART Tag.PARAMETER>. Point Name can be entered using the list of
values (…) or manually entered. The following table gives a list of standard device parameters
which may be considered for Modbus register mapping.
PV, SV, TV, and QV (dynamic variables) will vary by device type. Refer to the device’s
documentation for more information on what value is represented by each dynamic variable.
RELIABILITY and ONLINE relate to wireless communications. RELIABILITY is the percentage of
messages received from the wireless field device. ONLINE is a true/false indication of whether
the device is communicating on the wireless network.
**_HEALTHY parameters are a true/false indication of the health of a particular variable (** =
dynamic variable – PV, SV, etc…). These parameters incorporate critical diagnostics from the
wireless field device as well as communication status.
Table 5-1. Device Parameters Available
Parameter Description Data type
PV Primary Variable 32-bit float
SV Secondary Variable 32-bit float
TV Tertiar y Variable 32-bit float
QV Quaternary Variable 32-bit float
RELIABILITY A measure of connectivity to the Gateway 32-bit float
ONLINE Wireless communications status Boolean
PV_HEALTHY Health status for PV Boolean
SV_HEALTHY Health status for SV Boolean
TV_HEALTHY Health status for TV Boolean
QV_HEALTHY Health status for QV Boolean
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