Table of Contents
Advertisement
Glossary
Backplane bus:
For hardware controllers such as the S7-300 or S7-400, the backplane bus is the
printedcircuit board on the inside panel of the rack into which modules are inserted.
Backup battery:
The backup battery ensures that the -> user program in the -> CPU is stored inthe
event of a power failure and that defined data areas and memory markers,timers
and counters are retentive.
Bit memory:
Bit memory is part of the -> system memory of the CPU for storing interim results.
Bit-, byte-, word-, or double word-access of bit memory is possible.
Bus:
A bus is a communication medium connecting several nodes. Data
transmissioncan be serial or parallel across electrical conductors or fiber-optic
cables.
Chassis ground:
The chassis ground is the sum of all the interconnected inactive parts of aresource
which cannot assume a hazardous contact voltage even in the event of afault.
Cold restart:
The controller executes OB 102 before starting the free cycle (OB 1). Like a warm
restart, acold restart resets the peripheral inputs (PI) and changes the peripheral
outputs (PQ) to a predefinedsafe state (default is 0). However, a cold restart does
not save the retentive memory (M, T,C, or DB), but sets these areas to their default
(initial) values.
Communication interface:
CP cards, Siemens PC built-in PROFIBUS interface, or Industrial Ethernetinterface
that WinLC RTX uses for communications.
Configuration:
Assignment of modules to racks/slots and (for example, for signal
modules)addresses.
Windows Automation Center, WinAC Slot Version 4.0
Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
173
Advertisement
Table of Contents
