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Notes on Using this Manual
The S5-135U/155U PLC is a member of the family of SIMATIC S5
programmable (logic) controllers. The controller can be used in single
and in multiprocessor operation with up to four CPUs. In
multiprocessor operation, each CPU processes its individual user
program independently of the other CPUs (multi-computing).
CPUs available
The following are available as CPUs:
CPU 948
for fast word and binary signal processing,
especially fast double-word and floating point
processing, and for large programs with a high
storage requirement; programming in STEP 5.
When you use a CPU 948, you have an S5-155U
PLC.
CPU 928B
for fast word and binary signal processing and for
communication; programming in STEP 5.
CPU 928
for fast binary signal processing and for word
processing; programming in STEP 5.
CPU 922
(R processor)
for word processing
(computing, controlling, monitoring, signalling);
programming in STEP 5.
Slots
You can combine the CPUs arbitrarily at the CPU slots in the central
controller:
CPU
Slot Requirement
CPU 948/CPU 928B/CPU 928
2 slots
CPU 922
1 slot
System Manual
C79000-D8576-C199-03
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