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Glossary
Version:
Products having the same order number are distinguished by their version.
Theproduct version is incremented with each upwardly compatible function
extension,production-related modification (use of new components) or bug fix.
Virtual backplane bus:
For PC-based controllers, the virtual backplane bus is a software-based,
virtual"rack" that enables communications between the controller and other PC
Station components.
Warm restart:
Type of restart where the controller executes OB 100 before starting the free cycle
(OB 1). A warm restart resets the peripheral inputs (PI) and places the peripheral
outputs (PQ) into a predefinedsafe state (default is 0). The warm restart also saves
the current value for the retentivememory areas for the bit memory (M), timers (T),
counters (C), and data blocks (DBs).
Warm restart:
When the CPU restarts (for example, after changing the mode selector switch: from
STOP to RUN or after a Power ON), organization block OB 100 (Warm Restart) is
executed before cyclic program processing (OB 1). With a warm restart,
theprocess input image is read in and the STEP 7 user program is
executedstarting with the first command in OB 1.
Work memory:
Memory area (RAM) allocated for the blocks used at runtime.
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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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