Appendices
A-34
NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual (W505)
Safe operational − A state in EtherCAT communications where only SDO communica-
tions and reading input data from slaves are possible. Outputs from
slaves are not performed.
SDO communications − One type of EtherCAT communications that uses service data
objects (SDOs) for communicating information when required.
service data object SDO CoE asynchronous mailbox communications where all objects in the
object dictionary can be read and written.
Slave Information Interface SII Slave information that is stored in non-volatile memory in the slave.
subindex − Sub-address of an object within the object dictionary.
sync jitter − The offset in the operation timing between slaves.
sync manager SM Collection of control elements to coordinate access to concurrently
used objects.
system-defined variable − A variable in the NJ/NX-series CPU Unit for providing information
such as the EtherCAT communications status and error status. Sta-
tus information about EtherCAT communications is obtained by read-
ing system-defined variables from user applications in the NJ/NX-
series CPU Unit.
transmission jitter − The jitter in the process data transmission period (ns).
transmit PDO TxPDO A process data object sent from an EtherCAT Slave Unit.
WireShark − Freeware for monitoring and capturing packets.
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