Omron CJ1W-EIP21 Manual De Usuario

Omron

261

SECTION 10

Communications Performance and Communications Load

This section describes the communications performance in an EtherNet/IP network, and shows how to estimate the I/O
response times and transmission delays.

10-1 Communications System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tag Data Link Communications Method . . . . . . . . . . . . . . . . . . . . .

Calculating the Number of Connections. . . . . . . . . . . . . . . . . . . . . .

Network Transmission Delay Time . . . . . . . . . . . . . . . . . . . . . . . . .

10-2 Adjusting the Communications Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Checking Bandwidth Usage for Tag Data Links . . . . . . . . . . . . . . .

Tag Data Link Bandwidth Usage and RPI . . . . . . . . . . . . . . . . . . . .

Adjusting Device Bandwidth Usage. . . . . . . . . . . . . . . . . . . . . . . . .

Changing the RPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RPI Setting Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-3 I/O Response Time in Tag Data Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Timing of Data Transmissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EtherNet/IP Unit or CJ2H Built-in Port Data Processing Time . . . .

Effect on the CPU Unit’s Cycle Time. . . . . . . . . . . . . . . . . . . . . . . .

Tag Data Link I/O Response Time Calculation Example. . . . . . . . .

10-4 Tag Data Link Performance for CJ2M Built-in EtherNet/IP Ports . . . . . . . . .

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tag Data Link I/O Response Time . . . . . . . . . . . . . . . . . . . . . . . . . .

10-5 Message Service Transmission Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum Transmission Delays (Excluding Delays in the Network)