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System Modules
Configuration
Function
Peripheral Bus
( Basic Unit)
Read
ZE
ZE
Central
Proces−
sing
Write
Unit
ZE
Read
ZE
Write
ZE
Wait Signal
System Bus
4−66
To implement distributed expansion, the AG/DZ Expansion Module is
centrally installed in the basic unit, and the AG/DUs are remotely in
stalled in the expansion units.Distributed expansion requires the use of
the GG301/301−K Basic Unit.
A maximum of 2 expansion lines can be connected to each AG/DZ. Each
expansion line can contain up to 4 expansion stations, which in turn can
be expanded centrally and/or in parallel (see 2.1.12.3).
Communication between the expansion stations and the central proc
essing unit is handled by input and output images. These are contained
in the AG/DZ Expansion Module and are also maintained in the working
memory of the AG/DU module. The output image is written by the central
processing unit, read by the AG/DZ and transmitted to the AG/DU. The
input image is the reciprocal representation of the output image. The I/O
level can be accessed directly. For this purpose, the AG/DZ sends a
WAIT signal to the ZE.
AG/DZ
Processor
Input
Data
Image
Trans−
Output
fer
Image
Input
Func−
Byte
Error
tional
Message
Moni−
Output
toring
Byte
Fig. 4−36 Function AG/DZ and AG/DU
AG/DU
Processor
Peripheral Bus
Input
Data
Memory
Trans−
fer
Output
Memory
Feed−
back
Power supply for
Internal Operating
Voltages
Flexible Automation
Expansion
Unit
Input
Modules
Output
Modules
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