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Appendix A • Glossary
Automation PC 620 with 945GME N270 CPU board User's Manual V 1.10
RXD
An abbreviation for "Receive (
RX
)
D
ata". A line for transferring serial data received from one
device to another, e.g. from a modem to a computer. For connections complying with the RS-
232-C standard, the RXD is connected to pin 3 of the plug.
SDRAM
An abbreviation for "
S
ynchronous
D
ynamic
R
andom
A
ccess
M
emory". A construction of
dynamic semiconductor components (DRAM) that can operate with higher clock rates than
conventional DRAM switching circuits. This is made possible using block access. For each
access, the DRAM determines the next memory addresses to be accessed.
SFC
Sequential function chart > Graphic input language for PLCs used to represent sequential
control.
Slot PLC
PC insert card that has full PLC functionality. On the PC, it is coupled via a DPR with the process
using a fieldbus connection. It is programmed externally or using the host PC.
SoftPLC
Synonym for SoftPLC.
SRAM
An abbreviation for "
S
tatic
R
andom
A
ccess
M
emory". A semiconductor memory (RAM) made up
of certain logic circuits (flip-flop) that only keeps stored information while powered. In computers,
static RAM is generally only used for cache memory.
SUXGA
Abbreviation for
S
uper
U
ltra
E
xtended
G
raphics
A
rray; Generally a screen resolution of
2048×1536 pixels (4:3). An alternative name is QXGA (
Q
uad
E
xtended
G
raphics
A
rray), which
is 4x the pixel resolution of XGA.
SVGA
Abbreviation for "
S
uper
V
ideo
G
raphics
A
rray"; Graphics standard with a resolution of at least
800×600 pixels and at least 256 colors.
Switch
Device similar to a hub that takes data packets received in a network and, unlike a hub, passes
them only to the respective addressee, not to all network nodes. Unlike a hub, a switch provides
targeted communication within a network that only takes place between sender and receiver.
Other network nodes are not involved.
S
Summary of Contents for Automation PC 620
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