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Glossary
Network:
In terms of communications, a network is the interconnection of several CPUs
andother terminal – for example, a programming device – by means of
connectingcables. Data exchange is performed between the connected devices.
Node address:
The node number represents the "number" of a CPU, the programming device, or
another intelligent I/O module if they communicate with one another over a
network. The node address is assigned with the STEP 7 software.
Non-isolated:
On non-isolated input/output modules, there is an electrical connection betweenthe
reference potentials of the control and load circuits.
OP:
Operator panel
Operating system of the CPU:
The operating system of the CPU organizes all functions and processes of theCPU
that are not associated with a specific control task.
Organization block (OB):
Organization blocks (OBs) form the interface between the operating system and
the user program. They are called from the operating system and control cyclic and
interrupt-triggered program execution, the restart behavior of the controller,and
error handling.
PC station:
Representation of a software-based virtual rack that defines a PC-based
automation system.
PCI Bus:
Abbreviation for "peripheral component interconnect bus". The PCI bus is
thestandard bus on the AT-compatible PC.
PG/OP communication:
Communication between the controller and other S7 applications such
asprogramming devices, operator panels, and S7 controllers. WinAC Slot supports
PROFIBUS, MPI, and Industrial Ethernet for PG/OP communication.
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Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
Windows Automation Center, WinAC Slot Version 4.0
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