Siemens S5-135U/155U - Manual (Page 280)

6-18
System Manual
C79000-G8576-C199-06
6.5 923C Coordinator Module
6.5.1 Technical Description
This section contains information on the application, design and principle of
operation of the 923C coordinator.
The 923C coordinator module can be used in the S5-135U/155U
programmable controller and in the EU S5-185U expansion unit. There are
three main task areas which are, to some extent, independent:
S
Bus arbitration (only in the central controller)
To coordinate multiprocessor operation, i.e. the simultaneous use of two
to four CPUs (CPU 948, CPU 928B, CPU 928, CPU 922).
S
Communication memory (only in the central controller)
For the interchange of data between CPUs via communication flags and
data blocks.
S
Central programmer connection (PG MUX)
For the programming and startup of up to 8 modules via one PG
connection.
To program a programmable controller via the SINEC H1 or SINEC
L1/L2 bus, connect the SINEC CP to the PG connection of the COR C
using the 725 cable (“swing” cable).
Application
Multiprocessor Operation/Coordinators