Data Exchange; Figure 42: Memory Areas And Data Exchange Of The Fieldbus Coupler - WAGO I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
750-354/000-001 EtherCAT® Fieldbus Coupler, ID Switch
7.5

Data Exchange

The cyclic exchange of process data takes place using the EtherCAT
EtherCAT
master controller can be a PC or a PLC.
The fieldbus coupler is a slave device.
The fieldbus coupler is essentially equipped with two interfaces for cyclical
exchange of process data:
• interface to the fieldbus (fieldbus master)
• interface to the I/O modules.
The exchange of process data takes place between the EtherCAT
the I/O modules via the fieldbus coupler. In a process data cycle, the EtherCAT
master sends the output process data to the fieldbus coupler and receives input
process data from the fieldbus coupler.
The process image of the fieldbus coupler comprises a memory area with a size
of 1024 bytes or 512 words.

Figure 42: Memory Areas and Data Exchange of the Fieldbus Coupler

The fieldbus coupler records the input process data in the input process image
(PAE). The output process data are stored by the fieldbus coupler in the output
process image (PAA).
The fieldbus coupler reads the process data received from the EtherCAT
from the PAA. The fieldbus coupler forwards the output data via the I/O module
interface to the I/O modules.
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works according to the master/slave principle. The EtherCAT
Function Description 109
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protocol.
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master and
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master
Manual
Version 1.2.1
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