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Fieldbus Controller
Fieldbus Controller 750-872/020-000
3.1.6.5 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.
Fig. 3.1-10: Data exchange between PLC functionality (CPU) and I/O modules
3.1.6.6 Data Exchange between Master and PLC Functionality (CPU)
The fieldbus master and the PLC functionality of the controller regard the data
in a different manner.
Variable data created by the fieldbus master reaches the PFC as input
variables. Data created in the PFC is sent to the fieldbus master through
output variables.
In the PFC, the controller can access the MODBUS TCP PFC variable data
from word address 256 to 511 (double word address 128-255, byte address
512-1023) and the Ethernet IP PFC variable data from word address 1276 to
1531 (double word address 638-765, byte address 2552-3063).
Inputs
I/O modules
%IW0
%IW512
PII
%IW255
%IW1275
Inputs
PLC functionality (CPU)
Programmable Fieldbus Controller
Outputs
750-4xx....6xx
%QW0
%QW512
PIO
%QW255
%QW1275
Outputs
PII = Process Input
Image
PIO = Process Output
Image
15043e
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
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