MAN0964-14-EN_XL4_XL4P_UM
N o v e m b e r 1 0 , 2 0 2 1
P a g e 173 | 194
19.4 Modbus Addressing Table
To access XL4/XL4 Prime registers, a Modbus Master must be configured with the
appropriate register type and offset. This is usually accomplished with one of two methods:
Method 1: The first method uses Traditional Modbus References, in which the high digit
represents the register type, and the lower digits represent the register offset (starting with
Register 1 for each type). Since only four register types can be represented in this manner,
XL4/XL4 Prime Modbus Function Blocks pack several XL4/XL4 Prime register types into each
Modbus register type. Starting addresses of each XL4/XL4 Prime register type are shown in
the Traditional Modbus Reference column of the Table 19.1.
Method 2: The second method requires the Modbus Master to be configured with a specific
Modbus Command and Modbus Offset. The supported Modbus commands and the associated
offsets are also illustrated in Table 19.1.
Table 19.1
–
Modbus Master Mapping
XL4/XL4
Prime
Reference
Maximum
Range
Trad.
Modbus Ref.
(5 Digits)
Expanded
Modbus Ref.
(6 Digits)
Modbus Commands
Modbus
Offset
%I1
2048
10001
010001
Read Input Status (2)
0
%IG1
256
13001
013001
3000
%S1
256
14001
014001
4000
%K1
4
15001
015001
5000
%Q1
2048
00001
000001
Read Coil Status (1)
Force Coil (5)
Force Multiple Coils (15)
0
%M1
2048
03001
003001
3000
%T1
2048
06001
006001
6000
%QG1
256
09001
009001
9000
%AI1
512
30001
030001
Read Input Register (4)
0
%AIG1
32
33001
033001
3000
%SR1
256
34001
034001
4000
%AQ1
512
40001
040001
Read Holding Register (3)
Load Register (6)
Load Multiple Registers
(16)
0
%R1
2488
40513
040513
512
%R1
2048
43001
043001
3000
%AQG1
32
46001
046001
6000
%R1
9999
--
410001
10000