Rockwell Automation 20-COMM-M Modbus/TCP Adapter User Manual
Page 47
Using Modbus/TCP Function Codes
4-11
20-COMM-M Modbus/TCP Adapter User Manual
Publication 20COMM-UM014C-EN-P
Reading Device Parameters
1. Verify that the Unit Identifier is set to “0” (zero) or “16.”
2. Using
Table 4.J
and its associated formula, determine the value to use
for an adapter Indirect Par #x that points to the specific device
parameter you want to read. For example, suppose adapter Parameter
38 - [Indirect Par #1] is used and you want to read drive Parameter 003
- [Output Current] or drive Parameter 012 - [DC Bus Voltage]. In this
case, set adapter Parameter 38 - [Indirect Par #1] to a value of “3” or
“12” respectively.
3. Use Function Code 03 or 23 (
Table 4.A
) to read the value(s) of specific
device parameter(s). For this example, read register addresses 10041
and 10042 for adapter Indirect Parameter #1 Data as shown in
Table 4.K
.
Table 4.K Register Addresses for Indirect Parameter Data
Register
Address
Description
Detail
10041
Indirect Parameter #1 Data
Lo Word
10042
Hi Word
10043
Indirect Parameter #2 Data
Lo Word
10044
Hi Word
10045
Indirect Parameter #3 Data
Lo Word
10046
Hi Word
10047
Indirect Parameter #4 Data
Lo Word
10048
Hi Word
10049
Indirect Parameter #5 Data
Lo Word
10050
Hi Word
10051
Indirect Parameter #6 Data
Lo Word
10052
Hi Word
10053
Indirect Parameter #7 Data
Lo Word
10054
Hi Word
10055
Indirect Parameter #8 Data
Lo Word
10056
Hi Word
10057
Indirect Parameter #9 Data
Lo Word
10058
Hi Word
10059
Indirect Parameter #10 Data
Lo Word
10060
Hi Word
10061
Indirect Parameter #11 Data
Lo Word
10062
Hi Word
10063
Indirect Parameter #12 Data
Lo Word
10064
Hi Word
10065
Indirect Parameter #13 Data
Lo Word
10066
Hi Word
10067
Indirect Parameter #14 Data
Lo Word
10068
Hi Word
10069
Indirect Parameter #15 Data
Lo Word
10070
Hi Word
10071
Indirect Parameter #16 Data
Lo Word
10072
Hi Word