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.
Predefined Modbus registers
In addition to user configurable parameters, the Gateway also supports a list of predefined
Modbus registers with diagnostics and test parameters. The following table is a list of the
predefined Modbus registers.
Table 5-2: Predefined Modbus Registers
Description Register Data type
Current Year (1) 49001 32-bit int
Current Month (1) 49002 32-bit int
Current Day (1) 49003 32-bit int
Current Hour (1) 49004 32-bit int
Current Minute (1) 49005 32-bit int
Current Second (1) 49006 32-bit int
Messages Received 49007 32-bit int
Corrupt Messages Received 49008 32-bit int
Messages Sent With Exception 49009 32-bit int
Messages Sent Count 49010 32-bit int
Valid Messages Ignored 49011 32-bit int
Constant Float 12345.0 49012 32 float
SYSTEM_DIAG.HART_DEVICES 49014 32-bit int
SYSTEM_DIAG.ADDITIONAL_STATUS_0 49015 8-bit unsigned int
SYSTEM_DIAG.ADDITIONAL_STATUS_1 49016 8-bit unsigned int
SYSTEM_DIAG.ADDITIONAL_STATUS_2 49017 8-bit unsigned int
Reference Manual Operation and Maintenance
00809-0200-4410 September 2020
Emerson.com/Rosemount 39
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