Omron NJ501-1500, Connection Manual

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Terms and Definitions
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Term Explanation and Definition
Originator and
Target
To operate tag data links, one node requests the opening of a
communications line called a "connection".
The node that requests to open the connection is called an "originator",
and the node that receives the request is called a "target".
Each communication data is called an ''originator variable'' and a ''target
variable''.
In Sysmac Studio, the instance number is specified in the target variable.
Tag data link
parameter
A tag data link parameter is the setting data to operate tag data links.
It includes the data to set tags, tag sets, and connections.
EDS file A file that describes the number of I/O points for the EtherNet/IP device
and the parameters that can be set via EtherNet/IP.
RPI This is an abbreviation for Requested Packet Interval.
RPI indicates the data I/O refresh cycle that is set for each connection
between the originator and the target.