Model 3095FB Multivariable Transmitter with Modbus Protocol
Modbus Protocol Guide
Page 40 of 79
Scale Factor: The scale factor is the linear slope of the line represented in Figure 5-1 .
The scale factor is the ratio of the change of the scaled integers compared to the change of
the measured process variable.
The Scale Factor and Offset must be configured for the current unit codes. If the unit
codes are changed the Scale Factor and Offset must be recalculated.
[Equation 3] A = (y
2
- y
1
)/(x
2
- x
1
)
Offset: The offset is calculated using [Equation 4].
[Equation 4] B = A(x
1
) + 32768 - y
1
Table 5-10 Scale Factors and Offsets
Modbus Access
DESCRIPTION
Address
Address
Type
Attributes
Functional
Area
Data / Control
0198 Holding
register
RW PV Scaled
Integers
DP Scale Factor
0199 Holding
register
RW DP Offset
0200 Holding
register
RW SP Scale Factor
0201 Holding
register
RW SP Offset
0202 Holding
register
RW PT Scale Factor
0203 Holding
register
RW PT Offset
*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected
**These registers are available at multiple Modbus addresses (see Section 2.3)
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