Siemens simatic c7-621 Hardware Installation Manual page 132

Glossary
User Memory The user memory contains the logic and data blocks of the user program. The
user memory is integrated into the C7 CPU as a flash memory. However, the
user program is executed in the –> work memory of the C7 CPU.
User Program
The user program contains all the statements and declarations as well as data
for signal processing by which a plant or process can be controlled. It is
assigned to a programmable module (for example, C7 CPU, FM) and can be
structured in smaller units (blocks).
V
Varistor
Voltage-dependent resistor
W
Work Memory
The work memory is a RAM in the –> C7 620 that the processor uses to
access the user program during program execution.
Glossary-10
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01