Omron CJ1W-EIP21 User Manual

(1) When one of the listed CPU Bus Units is mounted in a CS-series Long-

distance Rack, the I/O refreshing time is extended by the distance to the
Rack in which the Unit is mounted, regardless of the model of the CPU
Unit. The following graph shows the coefficients (2 and 3) required to cal-
culate this effect.

(2) The additional time for CJ2H CPU Units with unit version 1.1 or later will

be as follows if high-speed interrupts are enabled. 

0.1 ms + Number of words transferred 

×

 0.87 

µ

s

When using the tag data link functions of the EtherNet/IP Unit or CJ2H built-in
port, there is a time lag between the point when the data link area’s data
changes due to an input at a node and the point when the change is output at
another node’s data link area. This time lag is called the tag data link 
I/O response time.

This example shows how to calculate the minimum and maximum I/O 
response times in the following configuration for connection 1 opened 
between node 1 and node 2. 

CJ2H

CPU Rack: 0.1 ms

Expansion Rack: 0.13 ms

CPU Rack: Value from left column + 0.1 ms + No. of words trans-
ferred 

×

 0.33 

µ

s (See note 2.)

Expansion Rack: Value from left column + 0.1 ms + No. of words 
transferred 

×

 0.45 

µ

s 

CJ2M

CPU Rack: 0.14 ms

Expansion Rack: 0.16 ms

CPU Rack: Value from left column + 0.02 ms + No. of words trans-
ferred 

×

 0.78 

µ

s

Expansion Rack: Value from left column + 0.02 ms + No. of words 
transferred 

×

 0.92 

µ

s

CJ1

0.25 ms

0.25 ms + 1.5 ms + (Number of words 

×

 1 

µ

s)

CJ1M

0.17 ms

0.17 ms + 0.1 ms + (Number of words 

×

 0.7 

µ

s)

CJ1-H

0.1 ms

0.1 ms + 0.1 ms + (Number of words 

×

 0.7 

µ

s)

CS1

0.2 ms

0.2 ms + 1.5 ms + (Number of words 

×

 1 

µ

s)

CS1-H

0.1 ms

0.1 ms + 0.1 ms + (Number of words 

×

 0.7 

µ

s)

Long-distance 
Rack

0.2 ms 

×

 Coefficient 2

(0.2 ms 

×

 Coefficient 2) + 1.5 ms + (Number of words 

×

 1 

µ

s 

×

 

Coefficient 3)

Coefficient

Distance to Long-distance Rack (m)