I/O Response Time In Tag Data Links; Timing Of Data Transmissions; Ethernet/Ip Unit Or Cj2H Built-In Port Data Processing Time - Omron CJ1W-EIP21 - 10-2010 Operation Manual

I/O Response Time in Tag Data Links

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

Note

10-3-1 Timing of Data Transmissions

10-3-2 EtherNet/IP Unit or CJ2H Built-in Port Data Processing Time

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.
Data received
EtherNet/IP EtherNet/IP Unit data
Unit processing processing time
(Refer to 10-3-2.)
CPU Unit processing
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).
Approximation of the data processing time for an
EtherNet/IP Unit or CJ2H Built-in Port
(0.0008 × Number of data transmission words) + 1.0 ms
Basic
Program
pro-
I/O refreshing
execution
cesses
Data exchange processing
CPU Unit's cycle time
Section 10-3
Basic
Peripheral
pro-
servicing
cesses
283