Siemens SIMATIC S7-300 Series Reference Manual page 186

Glossary
Time-of-day interrupt
³ Interrupt, time-of-day
Token
Access right on bus
Transmission rate
Rate of data transfer (bps)
User memory
User memory contains ³ Code/Data ³ blocks of the user program. User
memory can be integrated in the CPU, on Memory Card or Memory modules.
The user program, however, is always processed from ³ CPU main memory.
User program
SIMATIC differentiates between the ³ CPU operating system and user
programs. The latter are created with the Programming Software ³ STEP 7 in
the possible Programming languages ( FUP, STL) and stored in code blocks.
Data are stored in data blocks.
Ungrounded
Having no galvanic connection to ground
Varistor
Voltage-independent resistor
Watchdog Interrupt
³ Interrupt, Watchdog
Glossary-16
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01