Cpu; Interfaces Of The Cpu 948 - Siemens S5-135U/155U System Manual

5.1.3

Interfaces of the CPU 948

This section contains information on the interfaces of the CPU 948.
PG interface SI1 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.

Second Interface You can optionally use the second interface of the CPU 948 -3UA13 or the
SI2 CPU 948 -3UA23 as:
To utilize the second interface as the PG interface, you need the
You need one of the following interface submodules for the RK 512
computer link, for data transmission with procedures 3964/3964R and for
data transmission with the "open driver":
To utilize the second interface for data transmission via the SINEC L1 bus,
you need the
The CPU 948 -3UA13 or the CPU 948 -3UA23 is delivered without an
interface submodule. You can operate the CPU 948 -3UA13 or the CPU 948
-3UA23 without an integral interface submodule. The opening to accept a
submodule in the front plate is closed by a cover. Only remove the cover to
fit an interface submodule.
A description of interface submodules can be found in Section 5.11, and the
order numbers in the ordering information.
A detailed description of the second interface can be found in the
CPU 928B/CPU 948 Communication Manual.
System Manual
C79000-G8576-C199-06
CPUs, Memory Cards, Memory Submodules, Interface Submodules
A PG interface (for PG and operator panels)
Interface for the RK 512 computer link
Interface for data transmission with procedures 3964/3964R
Interface for data transmission with the "open driver"
Interface for data transmission via the SINEC L1 bus.
PG submodule.
V.24 submodule (RS 232C)
TTY submodule
RS422 A/485 submodule (only in the RS422 A module).
SINEC L1 submodule.
5-13