Emerson Smart Wireless Gateway, Справочное руководство

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Reference Manual
00809-0200-4420, Rev GA
Section 5: Host Integration
April 2013
Host Integration
Table 5-1. Device parameters available
PV, SV, TV, and QV (dynamic variables) will vary by device type. Please 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.
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