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STEP 7 Basic V10.5
Getting Started, 12/2009, A5E02651459-01
197
Glossary
Address
Designation of a certain address in the input, output or bit memory area of the CPU.
Addressing
Assignment of an address in the user program. Addresses can be assigned specific
operands or ranges of operands. Examples: Input I12.1; memory word MW25.
Automation system
An automation system is a programmable logic controller (PLC) consisting of a central
controller, a CPU, and various input/output modules.
Bit memory
Memory area in the system memory of a CPU. This can be written and read (in bits, bytes,
words, and double words). The bit memory is available to the user to save interim results.
Block
Structures the user program in independent sections. Parts of the user program can be
subdivided into blocks that can be reused at various locations or to make the structure of the
user program more straightforward.
Block parameters
Placeholder within blocks that can be used more than once and that are supplied with
current values when the relevant block is called.
Box
Boxes are program elements with complex functions. The empty box is an exception. You
can use the empty box as a placeholder in which you can select the required operation.
Coil
You can use coils to modify binary operands. Coils can set or reset a binary operand
depending on the signal state of the result of logic operation.
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