Modbus Register Mapping - WAGO 750 Series Manual

110 • MODBUS Functions

MODBUS Register Mapping

4.2.4 MODBUS Register Mapping
The following tables display the MODBUS addressing and the corresponding
IEC61131 addressing for the process image 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 and FC4):
0
... 255
256
... 511
512
... 767
768
... 4095
4096
... 12287
12288
... 65535
Register (Word) Access Writing (with FC6 and FC16):
0
... 255
256
... 511
512
... 767
768
... 4095
4096
... 12287
12288
... 65535
The digital Modbus services (coil services) are Bit accesses, with which only
the states of digital I/O modules can be determined or changed. Complex I/O
modules are not attainable with these services and so they are ignored.
Modbus-Address
[dec] [hex]
0x0000
... 0x00FF
0x0100
... 0x01FF
0x0200
... 0x02FF
0x0300
... 0x0FFF
0x1000
... 0x2FFF
0x3000
... 0xFFFF
Modbus-Address
[dec] [hex]
0x0000
... 0x00FF
0x0100
... 0x01FF
0x0200
... 0x02FF
0x0300
... 0x0FFF
0x1000
... 0x2FFF
0x3000
... 0xFFFF
IEC61131
Memory Range
Address
%IW0 Physical Input Area
... %IW255
- Modbus Exception:
"Illegal data address"
%QW0 Physical Output Area
... %QW255
- Modbus Exception:
"Illegal data address"
- Configuration Register
(see following Chapter 4.2.5.3
Functions
- Modbus Exception:
"Illegal data address"
IEC61131
Memory Range
Address
%QW0 Physical Output Area
... %QW255
- Modbus Exception:
"Illegal data address"
%QW0 Physical Output Area
... %QW255
- Modbus Exception:
"Illegal data address"
- Configuration Register
(see following Chapter 4.2.5.3
Functions
- Modbus Exception:
"Illegal data address"
Configuration
)
Configuration
)
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