Omron SYSMAC CJ1W-EIP21 Operation Manual page 325

Message Service Transmission Delay
CPU Bus Unit Service
Cycle (Local Node, 2)
CPU Bus Unit Service
Processing Time (Local
Node, 2)
Note
CPU execution mode
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.
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.
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.
Depending on the actual operating environment, the transmission time may
be longer than the one calculated with the equations given here. The following
factors can cause longer transmission times: other traffic on the network, win-
dow sizes of network nodes, other traffic at the EtherNet/IP Unit or built-in Eth-
erNet/IP port itself (e.g., simultaneous tag data link communications), and the
system configuration.
Processing time details
4% of CPU Unit cycle time
1 ms max.
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)
Processing time details
4% of CPU Unit cycle time
(10% for CJ2 CPU Units)
EtherNet/IP Unit or Time slice peripheral servicing
built-in EtherNet/IP execution time
port is given prior-
ity.
EtherNet/IP Unit or Set peripheral servicing time
built-in EtherNet/IP (Default: 4% of CPU Unit cycle
port is not given time)
priority.
4% of CPU Unit cycle time
1 ms max.
Section 10-5
299