Parameters accessible with Function Codes 03 an 10h
January 09 UDA2182 Communications User Guide 29
10. Parameters accessible with Function Codes 03 and 10h
Function codes 03 and 10h provide read/write access to the holding registers. The holding registers contain
the four analog and four digital variables.
10.1 Variables
Variables provide a means for the user to remotely set the value of setpoints and switches within the UDA
database. They are connected to parameters using the UDA front panel or PIE tool. In the function block
model, you can think of them as values connected to the inputs of function blocks that can be changed
during run-time. Analog variables are floating-point values that can be selected for parameters such
as alarm source, relay source, and RSP. Digital variables are long integer values that can be selected for
parameters such as alarm disable, RSP select, and tuneset 2 select. Variables have programmable startup
values, and their operating values can be monitored in the status menu. Refer to the UDA2182 User
manual for additional information.
10.2 Holding Registers Map
Table 10-1 describes the holding register map for Function Code 03 and 10h.
Conversion between Address (Hex) Number and Register (Decimal) Number
To convert the address number to the register number, convert the address from hexidecimal to decimal
and add 40,001. Registers are addressed starting at zero: registers 40,001-40,016 are addressed as 0-15. To
convert the register number to the address number, subtract 40,001 from the register and convert to hex.
Table 10-1 Holding Registers Map
Address
(hex)
Register
(decimal)
Parameter Name Type Notes
0000
40001
Analog Variable 1
Float
0002 40003
Analog Variable 2
Float
0004 40005
Analog Variable 3
Float
0006
40007
Analog Variable 4
Float
0008 40009
Digital Variable 1
Long 0=OFF; 1=ON
000A 40011
Digital Variable 2
Long 0=OFF; 1=ON
000C
40013
Digital Variable 3
Long 0=OFF; 1=ON
000E 40015
Digital Variable 4
Long 0=OFF; 1=ON
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