Contents and general safety instructions
XIII
Festo P.BE-CTEU-EC-OP+MAINT-EN en 1208NH
Term/abbreviation Meaning
Load voltage includes the power supply for connected devices and outputs, e.g.
solenoid coils of valves (load voltage supply as distinct f rom operating
voltage supply for electronics and sensors)
LSB Byte with the lowest importance (Least Significant Byte)
MDP Information model in which hardware and software components are
represented as individual modules (M
odular Device Profile)
MSB Byte with the highest importance ( Most Significant Byte)
O Digital output
OB Output byte
Object directory makes all important participant parameters accessible in a standard-
ised manner
PDO Process Data Objects provide fast transfer of process data and are
transmitted by simple EtherCAT messages with no protocol overhead.
Process Data Objec ts may be transmitted based on event control, syn-
chronised to a system clock, or on request.
PLC Programmable Logic Controller, same as SPS
Power supply Umbrella term for operating and load voltage supplies
SDO Service Data Objects form point-to-point connections between the
server and client, primarily for the exchange of parameters for dev ice
configuration. These permit write and read ac c ess to any entry in the
object directory of a bus node.
TwinCAT Beckhoff c onfiguration and programming software
(TwinCAT: The Windows Control and Automation Technology)
Tab. 0/3: Specific terms and abbreviatio ns – part 2
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