12 Communications Performance and Communications Load
12-16
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
The following examples explain how to calculate the packet intervals (RPIs) in the following network
configuration.
• Connections:
Example:Twenty CJ1W-EIP21 Units are connected to the network.
Each device has one 100-word tag for transmission and nineteen 100-word tags for recep-
tion, so that the Units exchange data mutually. By default, the packet intervals (RPIs) are
set to 10 ms for all of the connections. The devices’ IP addresses range from
192.168.250.1 to 192.168.250.20.
12-2-5 RPI Setting Examples
Conditions
CJ1W-EIP21: 20 Units
Connection RPI: 10 ms
20 network variables,
100 words each
192.168.250.1
CJ1W-EIP21 CJ1W-EIP21 CJ1W-EIP21 CJ1W-EIP21
192.168.250.3 192.168.250.20192.168.250.2
100CH
100CH
100CH
100CH
IP address:
In_01_b
In_01_c
In_01_t
Send
Out_01_a
Send
Out_02_b
In_02_c
In_02_t
In_02_a
In_03_b
Send
Out_03_c
In_03_t
In_03_a
In_20_b
In_20_c
Send
Out_20_t
In_20_a
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