Rockwell Automation Publication MOTION-UM003K-EN-P - January 2019 339
Glossary
System Time The absolute time value as defined in the CIP Sync standard in the context of a
distributed time system where all devices have a local clock that is synchronized
with a common master clock. In the context of integrated motion on the
EtherNet/IP network, System Time is a 64-bit integer value in units of
microseconds or nanoseconds with a value of 0 corresponding to January 1,
1970.
Time Offset The System Time Offset value that is associated with the integrated motion on
the EtherNet/IP network connection data that is associated with the source
device. The System Time Offset is a 64-bit offset value that is added to the
local clock of a device to generate System Time for that device.
Time Stamp A system time stamp value that is associated with the integrated motion on the
EtherNet/IP network connection data. The time stamp conveys the absolute
time when the associated data was captured, or can be also used to determine
when associated data is applied.
Variable Frequency Drive (VFD) A class of drive products that seek to control the speed of a motor, typically an
induction motor, through a proportional relationship between drive output
voltage and commanded output frequency. Frequency drives are, therefore,
sometimes referred to as Volts/Hertz drives.
Vector Drive A class of drive products that seek to control the dynamics of a motor via
closed-loop control. These dynamics include, but are not limited to, closed-
loop control of both torque and flux vector components of the motor stator
current relative to the rotor flux vector.
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