Omron CJ1W-EIP21 - 10-2010 Operation Manual page 323

Message Service Transmission Delay
CPU Bus Unit Service
Processing Time (Local
Node)
Send Processing
Transmission Delay
Receive Processing
CPU Bus Unit Service
Cycle (Remote Node)
For details, refer to the CPU Unit's Operation Manual.
The following table shows the CPU Bus Unit service processing time, which
depends on the CPU Unit's CPU processing mode setting.
CPU execution mode
Normal Mode (See note.)
Priority peripheral servicing
Parallel processing with syn-
chronous memory access
Parallel processing with asyn-
chronous memory access
Note CJ2 CPU Units support only Normal Mode.
For details, refer to the CPU Unit's Operation Manual.
(Number of words being transferred × 0.002) + 0.550 ms
The transmission delay time depends on the baud rate set for the EtherNet/IP
Unit or built-in EtherNet/IP port, as shown in the following table. (There may
be additional delays due to the other devices in the network, such as switch-
ing hubs.)
Baud rate
(Number of words being transferred × 0.0013) + 0.0118 ms
100Base-TX
(Number of words being transferred × 0.0019) + 0.0157 ms
10Base-T
(Number of words being transferred × 0.003) + 0.704 ms
The following table shows the CPU Bus Unit service cycle, which depends on
the CPU Unit's CPU processing mode setting.
CPU execution mode
Normal Mode (See note.)
Priority peripheral servicing
Parallel processing with syn-
chronous memory access
Parallel processing with asyn-
chronous memory access
Note CJ2 CPU Units support only Normal Mode.
For details, refer to the CPU Unit's Operation Manual.
Processing time details
Set peripheral servicing time
Default: 4% of CPU Unit cycle time
(10% for CJ2 CPU Units)
1 ms max.
Delay time
Processing time details
One CPU Unit cycle time
EtherNet/IP Unit or Time slice instruction execution
built-in EtherNet/IP time
port is given prior-
ity.
EtherNet/IP Unit or One CPU Unit cycle time
built-in EtherNet/IP
port is not given
priority.
One CPU Unit cycle time
0.2 ms + peripheral servicing time (1 ms max. for
peripheral servicing of each Special I/O Unit, CPU
Bus Unit, peripheral port, RS-232C port, and Inner
Board)
Section 10-5
295