Modbus Register Mapping - WAGO 750-872/020-000 Manual

4.2.4 MODBUS Register Mapping

The following tables display the MODBUS addressing and the corresponding
IEC61131 addressing for the process image, the PFC variables, the NOVRAM
data, and the internal variables is represented.
Via the register services the states of the complex and digital I/O modules can
be determined or changed.
Register (Word) Access Reading (with FC3, FC4 and FC23):
0
... 255
256
... 511
512
... 767
768
... 1023
1024
... 4095
4096
... 12287
12288
... 24575
24576
... 25340
25341
... 28671
28672
... 29436
29437
... 65535
Register (Word) Access Writing (with FC6, FC16, FC22 and FC23):
0
... 255
256
... 511
512
... 767
768
... 1023
1024
... 4095
4096
... 12287
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Modbus-Address
[dec] [hex]
0x0000
... 0x00FF
0x0100
... 0x01FF
0x0200
... 0x02FF
0x0300
... 0x03FF
0x0400
... 0x0FFF
0x1000
... 0x2FFF
0x3000
... 0x5FFF
0x6000
... 0x62FC
0x62FD
... 0x6FFF
0x7000
... 0x72FC
0x72FD
... 0xFFFF
Modbus-Address
[dec] [hex]
0x0000
... 0x00FF
0x0100
... 0x01FF
0x0200
... 0x02FF
0x0300
... 0x03FF
0x0400
... 0x0FFF
0x1000
... 0x2FFF
IEC61131
Memory Range
Address
%IW0 Physical Input Area (1)
... %IW255 First 256 Words of physical input data
%QW256 PFC-OUT-Area
... %QW511 Volatile PFC Output variables
%QW0 Physical Output Area (1)
... %QW255 First 256 Words of physical output data
%IW256 PFC-IN-Area
... %IW511 Volatile PFC Input variables
- Modbus Exception:
"Illegal data address"
- Configuration Register
(see following Chapter 4.2.5.3 Configuration
Functions)
%MW0 NOVRAM
... %MW12287 8kB retain memory (max. 24kB)
%IW512 Physical Input Area (2)
... %IW1275 Additional 764 Words physical input data
- Modbus Exception: "
Illegal data address"
%QW512 Physical Output Area (2)
... %QW1275 Additional 764 Words physical output data
- Modbus Exception: "
Illegal data address"
IEC61131
Memory Range
Address
%QW0 Physical Output Area (1)
... %QW255 First 256 Words of physical output data
%IW256 PFC-IN-Area
... %IW511 Volatile PFC Input variables
%QW0 Physical Output Area (1)
... %QW255 First 256 Words of physical output data
%IW256 PFC-IN-Area
... %IW511 Volatile PFC Input variables
- Modbus Exception:
"Illegal data address"
- Configuration Register
(see following Chapter 4.2.5.3 Configuration
Functions)
Fieldbus Communication
MODBUS Functions
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