Installation manual

Glossary
Glossary-12
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Operating System of the CPU
The operating system of the CPU organizes all functions and sequences of the
CPU which are not connected to a specific control task.
Organization Block (OB)
Organization blocks form the interface between the operating system of the S7-400
CPU and the user program. The sequence in which the user program should be
processed is laid down in the organization blocks.
P
Parameter
1. Variable of a STEP 7 logic block
2. Variable for setting the reaction of a module (one or more per module).
Parameters can be static or dynamic.
Parameters, Dynamic
In contrast to static parameters, dynamic parameters of modules can be changed
during operation by calling an SFC in the user program, for example, limit values of
an analog signal input module.
Parameters, Static
In contrast to dynamic parameters, static parameters of modules cannot be
changed by means of the user program, but only via STEP 7 (not in the RUN
state); for example, input delay of a digital signal input module.
PG
 Programming Device
PLC
 Programmable Logic Controller