Emerson Smart Wireless Gateway 1420, Справочное руководство

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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.
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.
Note
The **_HEALTHY parameters are a great indication of the health and communications
status of the data values.
State (state value): The value of a data point which drives a Modbus output of 1. For
example, if a data point is reported as either True or False, a state value of True will report a
1 for True and 0 for False. A state of False will report a 0 for True and a 1 for False. State is
only required for register numbers 0-19999 (Boolean, bit, coil, binary, etc…).
Invert: This check box will invert the Modbus output from a 1 to a 0 or a 0 to a 1. Invert is
only used for Boolean values using register numbers 0-19999.
Gain: This value is multiplied to the data value for the purpose of scaling integers. Gain is
only required if scaled is chosen on the Modbus communications page and globe gain and
offset is not chosen.
Offset: This value is added to the data value for the purpose of scaling integers. Offset is
only required if scaled is chosen on the Modbus communications page and globe gain and
offset is not chosen.
Reference Manual Operation and Maintenance
00809-0200-4420 September 2020
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