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S5-115U Manual
Accumulator (ACCUM)
The accumulator is an arithmetic register for loading, for example, internal times and counts.
Comparison, arithmetic and conversion operations are also executed in the accumulator.
Processor
The processor calls statements in the program memory in sequence and executes them in accor-
dance with the control program. It processes the information from the PII and takes into consi-
deration the values of internal timers and counters as well as the signal states of internal flags.
I/O Bus
The I/O bus establishes the electrical connection for all signals that are exchanged between the
CPU and the other modules in a central controller or an expansion unit.
Memory Submodules
The following three memory submodule types are available for the S5-115U to store the control
program or to transfer the program to the PLC:
•
EPROM Submodules
Use an ultraviolet erasing device to delete the submodule's contents.
•
EEPROM Submodules
Program and erase EEPROM submodules on a programmer.
•
RAM Submodules
are used in addition to program storage to test a control program during system start-up.
They should be used as program memories only when backup is guaranteed.
The individual submodules are available with different memory capacities. See the end of this
section for a table of memory submodules you can use (see Accessories).
EWA 4NEB 811 6130-02b
Technical Description
2-5
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