Technical data

72 • Fieldbus Controller 750-841
Data Exchange
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
3.1.5.5 Data Exchange between PLC Functionality (CPU) and I/O Modules
Through absolute addresses, the PLC functionality of the controller can
directly address the I/O module data.
The PFC addresses the input data with absolute addresses. The data can then
be processed, internally in the controller, through the IEC 61131-3 program,
whereby the flags are filed in a permanent memory area. Following this, the
linking results can be directly written in the output data via absolute
addressing.
%IW0 %QW0
%QW255%IW255
%IW512
%IW1275
%QW512
%QW1275
PII = Process Input
Image
PIO = Process Output
Image
Inputs
Outputs
I/O modules 750-4xx....6xx
PII
PIO
PLC functionality (CPU)
Inputs
Outputs
Programmable Fieldbus Controller
Fig. 3-10: Data exchange between PLC functionality (CPU) and I/O modules 15043e