Pg Multiplexer - Siemens S5-155U System Manual

923C Coordinator Module

PG multiplexer

Selection method for the
serial interfaces
6 - 24
These numbers are permanently set on the COR 923C and cannot be
changed. You must not use these numbers on other modules (CP, IP)
in the same PLC otherwise double addressing will occur.
When the supply voltage is switched on, the vector register is cleared.
The vector register then has the number 0H.
The transfer of data to and from this memory is implemented with
special functions of the CPU. You can find these functions in the
appropriate Programming Guides.
The PG interface of the COR 923C can be switched over to eight
different serial interfaces via the path selection of the PG software.
The multiplex interfaces have TTL level and are wired to the other
modules via the backplane connector and backplane.
Station numbers are assigned to all the modules to be served by the
multiplexer in the unit. These numbers must be within the range 1 to
31 (decimal). You set the lowest of these numbers, the base address,
with DIL switch S2 in binary code. The maximum of eight numbers
are allocated to the slots of the PLC (see following table).
All eight numbers or slots are assigned to switch S3: the lowest
number to switch S3.1, and the highest number to switch S3.8. The
setting of station numbers and the base address are described in more
detail in Section 6.5.2.
Switch
S3.1
S3.2
S3.3
S3.4
S3.5
S3.6
S3.7
S3.8
If slots are not occupied or if you wish to operate modules via their
own front connectors, you must delete the numbers assigned to the
corresponding slots with switch S3.
Note
For a module operated via the multiplexer, the front connector of
the PG interface of the CPU must not be plugged in. With CPUs
948 and 928B, this only applies to the integrated PG interface SI 1.
Slot Station No.
Base address
11
27 Base address + 1
43 Base address + 2
59 Base address + 3
75 Base address + 4
83 Base address + 5
91 Base address + 6
99 Base address + 7
System Manual
C79000-B8576-C199-03