Communication Interfaces; Memory Areas - WAGO 750-306 Technical Description

74 • Feldbus Coupler/Controller
Fieldbus Controller 750-806

3.2.5.1 Communication Interfaces

For a data exchange, the DeviceNet fieldbus Controller is equipped with three
interfaces:
• the interface to fieldbus (-master),
• the PLC functionality of the PFC (CPU) and
• the interface to the bus modules
Data exchange takes place between the fieldbus master and the bus modules,
between the PLC functionality of the PFC (CPU) and the bus modules as well
as between the fieldbus master and the PLC functionality of the PFC (CPU).
Data access of the PLC functionality of the PFC (CPU) is via an application
related IEC 61131-3 program and independent on the fieldbus system.
Access from the fieldbus side is fieldbus specific.

3.2.5.2 Memory Areas

The Controller uses a memory space of 256 words (word 0 ... 255) for the
physical input and output data.
The Controller is assigned an additional memory space for mapping the PFC
variables defined according to IEC 61131-3. This extended memory space
(word 256 ... 511 each) is used to map the PFC variables behind the physical
process image.
The division of the memory spaces and the access of the PLC functionality
(CPU) to the process data is identical with all WAGO fieldbus Controllers.
Access is via an application related IEC 61131-3 program and independent on
the fieldbus system.
Access from the fieldbus side is fieldbus specific.
WAGO-I/O-SYSTEM 750
DeviceNet