Siemens S5-135U/155U - Manual (Page 142)

5-2
System Manual
C79000-G8576-C199-06
5.1 CPU 948B -3UA13 or CPU 948B -3UA23
This section contains the hardware description and technical specifications of
the CPU 948B -3UA13 or the CPU 948B -3UA23.
Details on programming the CPU 948 can be found in the CPU 948
Programming Guide.
5.1.1 Technical Description
This section contains information on the application, design and structure of
the CPU 948.
You can use the CPU 948 in single and multiprocessor operation in the
S5-135U/155U central controller (see Chapter 6).
There are two versions of CPU 948:
S
The CPU 948-1 offers 640 Kbytes of internal user memory (RAM).
S
The CPU 948-2 offers 1664 Kbytes of internal user memory (RAM).
As an external memory medium, you can use a memory card 374.
The following program processing levels are possible:
S
Cyclic
S
Time-controlled (9 different timebases, real-time controlled, timeout)
S
Interrupt-driven from the S5 bus (8 process interrupts at block boundaries
via IB0 or, alternatively, 4 system interrupts)
S
Soft STOP.
The electronic circuitry of the CPU 948B is on one PCB in the double
Eurocard format. The front plate width is 1 1/3 standard plug-in stations, i.e.
20 mm. In the central controller rack, the CPU 948B -3UA13 or the
CPU 948B -3UA23 occupies one slot.
Application
Design
CPUs, Memory Cards, Memory Submodules, Interface Submodules