Cpus, Memory Cards, Memory Submodules, Interface Submodules - Siemens S5-155U System Manual

CPUs, Memory Cards, Memory
Submodules, Interface Submodules
System Manual
C79000-B8576-C199-03
This chapter contains information on the CPUs, memory cards,
modules and submodules which you can use in your programmable
controller.
The following CPUs may be fitted in an S5-135U/155U central
controller:
• • CPU 948
• • CPU 928B
• • CPU 928
• • CPU 922.
A programmable controller containing a CPU 948 is known as an
S5-155U PLC. A programmable controller containing CPUs 928B,
928 and/or 922 (and not the CPU 948) is known as an S5-135U PLC.
You can fit a flash EPROM memory card containing your user
program in the CPU 948. For the CPUs 928B, 928 and 922, there are
RAM or EPROM submodules for the purpose.
CPUs 948 and 928B have, apart from the programmer interface, a
second serial interface. An interface submodule is required for
physical adaptation.
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