S5-115U Manual
Technical Description
CPU 944
Figure 2-6. Schematic Representation of CPU 944
a a a a a a a a a a a a a
a a a a a a a a a a a a a
a a a a a a a a a a a a a
a a a a a a a a a a a a a
a a a a a a a a a a a a a
I/O module
Pro-
grammer
Microprocessor
for
2nd serial
interface
OP
Internal
RAM
96 KBytes
Microprocessor
- processes some
word operations
- controls bus
- handles 1st serial
interface
2 x ASICs
- processes bit and
word operations
- processes times
- processes sub-
stit. operations
- controls I/O
accesses
Control
panel
Memory
submodule
Operating
system memory
64 Kbytes for
- CPU
- 2nd serial in-
terface
Clock
Operating
system
memory
32 Kbytes
The CPU 944 contains two application-
specific integrated circuits (ASICs) and
a microprocessor.
The microprocessor handles all pro-
grammer interface module functions
and processes interrupts. The micro-
processor also controls the ASIC that
handles high-speed processing of
STEP
5 operations, monitors the scan
time and controls I/O accesses. The
CPU 944 also has an internal
RAM
(48
Kbytes) that can be used to store
the control program.
The contents of memory submodules is
copied to the internal RAM after
POWER UP and after overall reset. The
operating system is stored on a special
memory submodule and can be re-
placed without opening the module.
The CPU 944 can also be ordered with
two interfaces. The second interface is
controlled by a further microprocessor
with its own operating system. This
operating system is also stored on the
special memory submodule that can be
replaced without opening the module.
Programmers, operator panels (OPs)
and SINEC L1 can be connected to the
second interface; point-to-point con-
nection via the SINEC L1 protocol is
also possible. The CPU 944 operating
system also supports the following
additional functions:
•
ASCII driver for data interchange
over the second interface and for
connecting peripheral devices (e.g.
printers)
•
Computer interface
(3964(R)
procedure)
with
oper-
ating system submodule for this
purpose
•
Integral real-time clock.
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Содержание SIMATIC S5-115U
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