
Glossary-12
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Transmission rate
The transmission rate is the data transmission speed and specifies the number
of transmitted bits per second (transmission rate = bit rate).
In the case of the ET 200S, transmission rates of 9.6 kbaud to 12 Mbaud are
possible.
User memory
The user memory contains the code and data blocks of the user program. The
user memory can be integrated in the CPU or can be provided on plug-in
memory cards (IM 151-7 CPU) or memory modules. However, the user program
is always processed from the working memory of the CPU.
User program
SIMATIC differentiates between the operating system of the CPU and user
programs. The latter are created in the various programming languages (ladder
diagram and instruction list) using the STEP 7 programming software and are
stored in code blocks. Data is stored in data blocks.
Working Memory
The working memory is random-access memory in the CPU that is accessed
by the processor while the user program is executed.
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