Omron CJ1W-EIP21 ユーザーズマニュアル

This section describes the data processing time for an EtherNet/IP Unit or a
built-in EtherNet/IP port on a CJ2H-CPU6

@

-EIP CPU Unit. The data process-

ing time for a built-in EtherNet/IP port on the CJ2M-CPU3

@

 CPU Unit is differ-

ent. For details, refer to 10-4 Tag Data Link Performance for CJ2M Built-in
EtherNet/IP Ports.

The following diagram shows the timing of tag data link transmissions
between the EtherNet/IP Unit or CJ2H built-in port and the CPU Unit. 

The data transmission is processed during the I/O refresh period. Send data
is processed with transmission at regular intervals, and received data is pro-
cessed together with the send data when new data has been received from
other nodes. The following diagram shows the timing of data transmissions. 

If there is an interrupt for data transmission processing, the CPU Unit’s cycle
time is extended by that interrupt processing time. Refer to 10-3-2 EtherNet/IP
Unit or CJ2H Built-in Port Data Processing Time for details. 

The following formula approximates the time required for the EtherNet/IP Unit
or CJ2H built-in port to process data transmissions with the CPU Unit (i.e., the
data processing time). 

CPU Unit processing

Basic 
pro- 
cesses

Program 

execution

I/O refreshing

Peripheral 

servicing

Data exchange processing

Basic 
pro- 
cesses

 

 

 

Data received

EtherNet/IP 
Unit processing

EtherNet/IP Unit data 
processing time

(Refer to 10-3-2.) 

CPU Unit’s cycle time

(0.0008 

×

 Number of data transmission words) + 1.0 ms