S5-115F Manual
Technical Description
CPU 942F
The CPU 942F has a microprocessor and an application-specific integrated circuit (ASIC
1
). The
microprocessor handles all programmer interface module functions, processes integral timers,
processes word operations, and controls the S5 bus. The microprocessor also controls the ASIC that
monitors scan time, processes bit operations quickly, and processes some word operations. Besides
the operating system memory, the CPU 942F contains an internal RAM that can be used to store up
to 5 Kbytes of user data. External memory submodules with a capacity of 8 to 32 Kbytes can also be
plugged into the CPU.
Operating
system memory
64 Kbytes
Microprocessor
- processes word
operations
- processes timers
- controls bus
- handles program-
mer interface
ASIC
- processes bit
and some
word opera-
tions
- monitors scan
time
Control
panel
Memory sub-
module for
8 to 32 Kbytes
User data
I/O
modules
Con-
troller
for
S5 bus
PG
Internal RAM
5 Kbytes
User data
Figure 2-7. Schematic Representation of CPU 942F
Note
Two CPU 942Fs of the same version are always required to construct an S5-115F. You
can read and check the system software version using the ”SYSPAR” (system
parameter) programmer function.
1 application specific intergrated circuit
EWA 4NEB 811 6148-02
2-11
