Omron CJ1W-EIP21 用户手册

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

Section 10-4

If the same RPI is set for all connections, 12 ms is the lowest setting that can
be used.

■

Calculation Example

(1,000

12 [ms] (RPI) + 1,000

100 [ms] (heartbeat transmission period))

32 (connections) = 2,987 pps < 3,000 pps

10-4-2 Tag Data Link I/O Response Time

With tag data links, if the data in the data link area for a node changes due to
an input to that node, a certain amount of time is required for the data in data
link area at another node to be updated and output.

The I/O response time for tag data links can be calculated for a CJ2M built-in
port in the same was as it can for a CJ2H built-in port (refer to 10-2-4 Chang-
ing the RPI). Here, formulas to calculate guideline I/O response times are pro-
vided. (Tag data link delays are ignored because the data link size handled by
the built-in CJ2M port is small.)

Maximum I/O Response Time

Input ON delay + Cycle time of sending PLC

2 + RPI + Cycle time of receiv-

ing PLC

2 + Output ON delay

Minimum I/O Response Time

Input ON delay + Cycle time of sending PLC + Cycle time of receiving PLC +
Output ON delay

*All nodes use CJ2M built-in ports.

Node 1

Send 20 words

Receive 20 words

Send connections = 16
(20 words

16 = 320 words)

Node 2

Send 20 words

Receive 20 words

Node 3

Node 16

Node 17

Receive connections = 16
(20 words

16 = 320 words)

All connections

Cycle time: 5 ms

Input ON response time:

1.5 ms

Input

Output

Data link

EtherNet/IP

Connection

RPI: 12 ms

PLC #1
Node 1

PLC #2
Node 2

20
words

Cycle time: 10 ms

Output ON response

time: 2.0 ms