17
Putting it Together The user memory of a PLC, such as the S7-200 PLC shown in
the following illustration, includes space for the user program as
well as addressable memory locations for storage of data. The
amount of program and data space available depends on the
CPU model.
User program space stores instructions that are executed
repetitively as part of the PLC scan. The user program is
developed using a programming device, such as a personal
computer (PC) with programming software, then loaded into the
user program memory of the PLC.
A variety of addressable memory locations are used for storage
of data that is available to the user program. Among other
things, this includes memory locations for variable data, discrete
inputs and outputs, analog inputs and outputs, timers, counters,
high-speed counters, etc.
I0.0 I0.1
Q0.0
Q0.1
I0.4
I0.5
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