Modbus Register Mapping; Table 106: Register Access Reading (With Fc3 And Fc4) - WAGO -I/O-SYSTEM 750 XTR Manual

168 Fieldbus Communication
Note that if the register ranges overlap, the results are undefined!
If register areas for read and write overlap, the results are undefined.
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11.2.4

MODBUS Register Mapping

The following tables display the MODBUS addressing and the internal variables.
Via the register services the states of the complex and digital I/O modules can be
determined or changed.
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Register Access Reading (with FC3 and FC4)

Table 106: Register Access Reading (with FC3 and FC4)

MODBUS address
[dec]
0...255
256...511
512...767
768...4095
4096...12287
12288...24575 0x3000...0x5FFF
24576...25339 0x6000...0x62FB
25340...28671 0x62FC...0x6FFF
28672...29435 0x7000...0x72FB
29436...65535 0x72FC...0xFFFF
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Manual
Version 1.3.0
IEC 61131
[hex] address
0x0000...0x00FF %IW0...%IW255
0x0100...0x01FF
0x0200...0x02FF %QW0...%QW255
0x0300...0x0FFF
0x1000...0x2FFF
%IW256...%IW1020
%QW256...%QW1020 Physical output area (2)
WAGO-I/O-SYSTEM 750 XTR
750-352/040-000 FC ETHERNET G3 XTR
Memory range
Physical input area (1)
First 256 Words of physical input data
- MODBUS exception:
"Illegal data address"
Physical output area (1)
First 256 Words of physical output data
- MODBUS exception:
"Illegal data address"
- Configuration register (see Section
„Configuration Register")
- MODBUS exception:
"Illegal data address"
Physical input area (2)
Additional 764 Words physical input data
- MODBUS exception:
"Illegal data address"
Additional 764 Words physical output data
- MODBUS exception:
"Illegal data address"