Interfaces Of The Cpu 948 - Siemens S5-155U System Manual

5.1.3

Interfaces of the CPU 948

PG interface SI1
Interface SI2
Communication via parallel
backplane bus with SINEC H1
System Manual
C79000-B8576-C199-03
This section contains information on the interfaces of the CPU 948.
You can use the PG interface on the CPU 948 either via the front
connector or via the 923C coordinator module and the S5 bus.
Note
Simultaneous operation of the PG interface via the front
connector of the CPU 948 and via the 923C coordinator is not
possible. Switching the PG online without a job request is already
sufficient to operate the interface. Electrically, it is merely a PG
interface which can be operated via two different terminals.
The connection to the PG can be established in every operational state
of the CPU.
You can also use the second interface of the CPU 948 as a PG
interface. Physical adaptation is achieved with a PG module (see also
Section 5.8, Interface Submodules).
A detailed description of PG interfaces can be found in the CPU 948
Programming Guide.
A PG-PLC link via SINEC H1 allows very advanced communication
between the partners. For example, the user software can be loaded
into the CPU 948 up to eight-times faster than with serial
communication.
For this link you will need, in addition to the CPU 948, a CPU 143
(Version ≥ 2.1) in the PLC and a PG7xx with SINEC H1 connection
and the STEP 5 single-tasking software from Version 6.0 or multi-tasking
from Version 2.0.
Note
You cannot implement communication via SINEC H1 in parallel
with the serial interfaces.
Communication via SINEC H1 is described in detail in the CPU 948
Programming Guide.
CPU 948
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