Omron Sysmac NX1P2-10 1 Series, User Manual

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15-1 Communications System
15-1-1
Tag Data Link Communications Method
Requested Packet Interval (RPI) Settings
In tag data links for the built-in EtherNet/IP port, the data transmission period is set for each connec-
tion as the RPI.
The target device sends data (i.e., output tags) based on the specified RPI, regardless of the number
of nodes.
Also, the heartbeat frame is sent from the originator to the target device for each connection. The tar-
get device uses the heartbeat to check if any errors have occurred in the connection with the origina-
tor. The data transmission period of the heartbeat frame depends on the RPI settings.
Heartbeat Frame Transmission Period
• If packet interval is shorter than 100ms, the heartbeat frame transmission period is 100ms.
• If packet interval is equal to or larger than 100ms, the heartbeat frame transmission period is the
same as the RPI.
Example)
In this example, two tag data link connections are set for node 2 (the originator) and node 1 (the tar-
get).
The RPI for output data 1 is set to 10ms.
The RPI for output data 2 is set to 15 ms.
In this case, output data 1 is sent from node 1 to node 2 every 10 ms, and output data 2 is sent from
node 1 to node 2 every 15 ms, as shown in the following diagram.
Also, data is sent from node 2 (the originator) to node 1 (the target) with a heartbeat of 100 ms for
connection 1 and a heartbeat of 100 ms for connection 2.
15 Communications Performance and Communications Load
15-2
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)