Omron CJ1W-EIP21 User Manual

This is the delay time for the external input device from when the input occurs
until the switch actually turns ON and the time until the input data is stored in
the memory area of the CPU Unit for PLC #1. In this system, the input switch
delay time is 1.5 ms. Also, one CPU cycle time is required until the data is
stored in the memory area of the CPU Unit. Therefore, the input ON response
time is 1.5 ms + 10 ms, or 11.5 ms. 

This is the time until memory data in the CPU Unit is transferred to the Ether-
Net/IP Unit. If the amount of data that can be processed in one data transmis-
sion with the CPU Unit is exceeded, data transmission will be performed over
multiple cycles of the CPU Unit, and so time is calculated for the number of
transmissions times the CPU Unit cycle times. The following table gives the
send data processing times and breakdown for node 1 (PLC #1) in this sys-
tem configuration. Refer to 10-3-2 EtherNet/IP Unit or CJ2H Built-in Port Data
Processing Time for details on the calculation formula for each item. 

Output

: I/O processing

: Data exchange

Tag data link I/O response time 

(1) Input ON 
response 
time 

(2) Send data 
processing 
time 

(3) RPI

(4) Network transmission delay time

(5) Receive data 
processing time 

(6) Output ON 
response time 

Input

Calcu-
lation 

Calcu-
lation 

PLC #1 processing 

Send data processing time 

Cycle time x 2

Tag data link refresh cycle 

Receive data processing time 

PLC #2 processing 

Input device 

Transmission  

path 

Output  

device 

PLC #1

PLC #2

Cycle time x 4

A

 CPU Unit cycle time 

for PLC #1

10 m sec

B

 Number of transmis-

sions based on the data 
size 

Number of data transmission words (11,552 
words) 

÷

 6,432 words (using a CJ2 CPU 

Unit)

2

C

 EtherNet/IP Unit data 

processing time 

0.0008 

×

 6,432 + 1.0 (Maximum number of 

transmission words per cycle)

6.15 m sec