Control Techniques Nidec SI-EtherCAT User Manual page 164

PLC: Programmable logic controller.
Poll rate: The rate at which cyclic data is sent and received on the network.
Polled data: See Cyclic data.
Scan rate: See Poll rate.
Shielding: A connection to provide additional immunity to noise used on a network cable.
Status word: A value that denotes the status of the drive. Each bit within the word will have a
specific meaning.
Word: A collection of sixteen binary digits.
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SI-EtherCAT User Guide