Glossary
S7-300 Programmable Controller Hardware and Installation
12-8 A5E00105492-01
Interrupt, time-of-day
The time-of-day interrupt belongs to one of the priority classes when processing
programs in SIMATIC S7. It is generated depending on a specific date (or daily)
and time-of-day (e.g. 9:50 or hourly, or every minute). A corresponding
organization block is then executed.
Interrupt, watchdog
A watchdog interrupt is generated periodically by the CPU in configurable time
intervals. A corresponding --> organization block is then executed.
Interrupt
The CPU's --> operating system knows 10 different priority classes for controlling
user program execution. e.g. process interrupts. When an interrupt is triggered, the
operating system automatically calls an assigned organization block in which the
user can program the desired response (for example in an FB).
Load memory
The load memory is part of the central processing unit. It contains objects
generated by the programming device. It is implemented either as a plug-in
memory card or a permanently integrated memory.
Local data
--> Data, temporary
Main memory
Working memory is a RAM memory in the --> CPU accessed by the processor
during user program execution.
Master
Masters in possession of the --> Token can send/request data to/from other nodes
(= active node).
Memory bits
Memory bits are part of the CPU's --> system memory. They store the intermediate
results of calculations. They can be accessed in bit, byte, word or doubleword
units.
Memory card
Memory cards are memory media in smart card format for CPUs and CPs. They
are implemented as --> RAM or --> FEPROM.
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