Technical data

Fieldbus Controller 750-841 • 75
Data Exchange
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
3.1.5.6.2 Comparison of MODBUS TCP Addresses and IEC 61131-3 Addresses
3.1.5.6.2.1 Word Access
MODBUS AddressesMethod
decimal hexadecimal
IEC1131 Addresses Description
0...
255
0x0000 –
0x00FF
%IW0...
%IW255
phys. Inputs (1)
256...
511
0x0100 –
0x01FF
%QW256...
%QW511
PFC OUT variables
512 ...
767
0x0200 –
0x02FF
%QW0...
%QW255
phys. Outputs (1)
768 ...
1023
0x0300 –
0x03FF
%IW256...
%IW511
PFC IN variables
illegal Address 0x0400 –
0x0FFF
not supported
4096...
8191
0x1000 –
0x1FFF
not supported Configuration register
8192 ...
12287
0x2000 -
0x2FFF
not supported Firmware register
12288...
24575
0x3000 -
0x5FFF
%MW0...
%MW12288
RETAIN variables
24576 ...
25340
0x6000-
0x62FC
%IW512...
%IW1275
phys. Inputs (2)
FC3
- Read Multiple Register
FC4
– Read Holding Register
28672 ...
29436
0x7000-
0x72FC
%QW512...
%QW1275
phys. Outputs (2)
0...
255
0x0000 –
0x00FF
%QW0...
%QW255
phys. Outputs (1)
256...
511
0x0100 –
0x01FF
%IW256...
%IW511
PFC IN variables
512...
767
0x0200 –
0x02FF
%QW0...
%QW255
phys. Outputs (1)
768 ...
1023
0x0300 –
0x03FF
%IW256...
%IW511
PFC IN variables
illegal Address 0x0400 –
0x0FFF
not supported
4096...
8191
0x1000 –
0x1FFF
not supported Configuration register
illegal Address 0x2000 -
0x2FFF
not supported Firmware register
12288...
24575
0x3000 -
0x5FFF
%MW0...
%MW12288
RETAIN variables
24576 ...
25340
0x6000-
0x62FC
%QW512...
%QW1275
phys. Outputs (2)
FC16
– Write Multiple Register
28672 ...
29436
0x7000-
0x72FC
%QW512...
%QW1275
phys.. Outputs (2)