3. Repeat for each new data point.
4. Select Submit.
5. When changes have been accepted, select Return to form.
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.
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.
Table 5-1: Device parameters available
Parameter Description Data type
PV Primary Variable 32-bit float
SV Secondary Variable 32-bit float
TV Tertiary 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
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.
Operation and Maintenance Reference Manual
September 2020 00809-0200-4410
38 Emerson.com/Rosemount
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