Technical data

Glossary
Structure and Use of the CPU Memory
Function Manual, 01/2013, A5E03461664-01
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Standard access
Data blocks with standard access have a fixed structure. In the declaration, the data
elements receive both a symbolic name and a fixed address within the block. The address is
displayed in the "Offset" column.
In these data blocks, you can address tags both symbolically and absolutely.
"Data".FillState
DB1.DBW2
Timers
In STEP 7, programmed time processes are performed using timers. The content of timer
cells is automatically updated by the operating system, asynchronously to the user program.
STEP 7 instructions are used to define the precise function of the timer cell
(for example, on-delay time) and to trigger their execution (for example, start).
User program
The user program contains all instructions, declarations and data for signal processing
required to control a plant or a process. The user program is assigned to a programmable
module (for example, CPU, CM) and can be structured in smaller units.