Siemens SIMATIC Field PG P4 Manual page 140

Glossary
SIMATIC Memory Cards
Memory submodules in credit-card format for SIMATIC S5 and SIMATIC S7 which
are programmed with the PG and can be plugged into an S5 or S7 programmable
logic controller.
Software
The collective term for all programs which are used on a computer. The operating
system and the user programs are part of the concept "software".
SOM
Safecard On Motherboard. Consists of a monitoring module on the motherboard,
the driver and the SOM program. Provides functions for monitoring various
temperatures and the program cycle (Watchdog).
Standby
Power saving status: for example, hard disk drive or display turned off.
STEP 5
This is a software package which represents the basis for all other STEP 5
software packages. With the programming device (PG), this package is used to
program programmable logic controllers of the SIMATIC S5 family. The language
used is known as STEP 5.
STEP 7
Programming software for the creation of user programs for SIMATIC S7 control.
STN Display
Super Twist Nematic passive display
Suspend to Disk
Transition to power-off status, with prior saving of the system contents to the hard
disk drive.
Suspend to RAM
Transition to power-saving status, with prior saving of the system contents to the
RAM.
Glossary-14
SIMATIC Field PG P4 Manual
A5E00180080-04