Siemens SINEC L2

S5-95U, SINEC L2 List of Abbreviations/Glossary
EWA 4NEB 812 6112-02 C-5
Optical fiber link Transmission medium employing fiber optic waveguides
P
Parameter assignment
error byte
Diagnostic byte for flagging possible errors when assigning
parameters to the integral L2-SEND and L2-RECEIVE FBs
Passive station A passive station may only exchange data with an active station
when requested to do so by that station
Planning level The hierarchical level in an integrated automation system at which
production orders are planned, product strategy is established,
production guidelines are defined and information from the
production process is monitored
Process supervision level The hierarchical level in an integrated automation system at which
decisions are made concerning production procedures and the
coordination of function groups
PROFIBUS Process and field bus as defined in the PROFIBUS standard (DIN
19245). The standard specifies the functional, electrical and
mechanical properties of this bit-serial field bus system
R
Receive mailbox Area in the data block (DB) or flag byte containing the data
received from a data transmission
Receiver remote station
Remote station A responding station in a communications link as opposed to the
initiating local station
Repeater A resource for amplifying LAN bus signals and coupling LAN
segments over great distances
Repeater adapter A resource for a mixed configuration of RS 485 and FO
transmission technologies
Request A service request of the local station
RS 485 transmission
technology
SINEC L2 LAN configuration involving shielded twisted- pair wires
S
SAP Service access point to layer 2
SDA Send Data with Acknowledge: Data transmission service provided
by layer 2 for acyclic send and request mode
SDN Send Data with No Acknowledge: Data transmission service
provided by layer 2 for acyclic send and request mode
Segment The smallest functional unit of a LAN
Send mailbox Area in a data block (DB) or flag byte containing the data to be
transmitted
Sender local station