Model 3095FB Multivariable Transmitter with Modbus Protocol
Modbus Protocol Guide
Page 31 of 79
5.0 Process Variables
5.1 Process Variables and Process Variable Unit Codes
Floating point values of process variables, and integer unit codes for the corresponding mea-
surement units can be read from the registers shown below. The unit codes are 8 bit integers
that are stored in the Least Significant Byte of their 16 bit register. For instance if the value
$0001 is stored in register 40060 it would represent the unit code 1 (Inches of H
2
O@ 60
o
F).
Table 5-1 Process Variables
Modbus Access
DESCRIPTION
Address
Address
Type
Attributes
Functional
Area
Data / Control
0401,
0402
FP register RO PVs DP
0403,
0404
FP register RO SP
0405,
0406
FP register RO PT
*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected
**These registers are available at multiple Modbus addresses (see Section 2.3
located in the Modbus Protocol Guide)
Table 5-2 Unit Codes
Modbus Access
DESCRIPTION
Address Attributes Variable Integer Codes Default
0060 R/W, WP Differen-
tial Pres-
sure
1
2
3
6
inches of water at 60 F
pascals
kilopascals
inches of water at 68 F
1
0061 R/W, WP Static Pres-
sure
3
4
5
kilopascals
Mega Pascals
Pounds per Square Inch
5
To Next Page
Loading...
