Process Data Architecture; Figure 36: Start Behavior - WAGO I/O-SYSTEM 750 Manual

68 Function Description

Figure 36: Start Behavior

7.3

Process Data Architecture

After switching on the supply voltage, the fieldbus coupler identifies all I/O
modules connected with the node that send or receive data (data width/bit width
> 0). In the maximum total extension the node can consist of a mixed
arrangement of a maximum of 64 analog and digital I/O modules, connected on
the fieldbus coupler.
The data of the digital I/O modules are bit-oriented; i.e., digital data are sent bit
by bit. The data of the analog I/O modules are byte-oriented; i.e., analog data are
sent byte by byte. The term "Analog I/O modules" represents the group of byte-
oriented I/O modules, which send data byte by byte. This group includes, for
example, counter modules and angle and distance measurement modules.
The fieldbus coupler stores the process data in the process images. The fieldbus
coupler works with a process output data image (PIO) and a process input data
image (PII).
The PIO is filled of the fieldbus master with the process output data. The PII is
filled of the fieldbus coupler with the process input data.
Manual
Version 1.2.1
750-354/000-001 EtherCAT® Fieldbus Coupler, ID Switch
WAGO-I/O-SYSTEM 750