CJ1W-EIP21 Omron, CJ1W-EIP21 Datasheet - Page 324

• Manufacturer Part Number: CJ1W-EIP21
• Description: Ethernet I/P Module
• Manufacturer: Omron

Specifications of CJ1W-EIP21

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Message Service Transmission Delay
CPU Bus Unit Service
Processing Time (Remote
Node)
Example Calculation
296
Note
The following table shows the CPU Bus Unit service processing time, which
depends on the CPU Unit’s CPU processing mode setting.
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.
In this example, SEND(090) is used to send 256 words of data between two
PLCs. The maximum transmission delay is calculated based on the following
operating conditions.
Normal Mode (See note.)
Priority peripheral servicing
Parallel processing with syn-
chronous memory access
Parallel processing with asyn-
chronous memory access
CPU Bus Unit service cycle (local
node)
CPU Bus Unit service processing
time (local node)
Send processing
Transmission delay
Receive processing
CPU Bus Unit service cycle (remote
node)
CPU Bus Unit service processing
time (remote node)
Maximum transmission delay
• Local node’s CPU cycle time: 10 ms
• Local node’s CPU execution mode: Normal
• Local node’s CPU peripheral servicing time: Default (4%)
• Remote node’s CPU cycle time: 5 ms
• Remote node’s CPU execution mode: Normal
• Remote node’s CPU peripheral servicing time: Default (4%)
• Baud rate: 100Base-TX
Note CJ2 CPU Units support only Normal Mode.
CPU execution mode
Item
Set peripheral servicing time
Default: 4% of CPU Unit cycle time
EtherNet/IP Unit or
built-in EtherNet/IP
port is given prior-
ity.
EtherNet/IP Unit or
built-in EtherNet/IP
port is not given
priority.
Set peripheral servicing time
Default: 4% of CPU Unit cycle time
1 ms max.
10 ms
0.4 ms
(256 × 0.002) + 0.550 = 1.062 ≅ 1.1 ms
(256 × 0.0013) + 0.0118 = 0.3446 ≅ 0.3 ms
(256 × 0.003) + 0.704 = 1.472 ≅ 1.5 ms
5 ms
0.2 ms
10 + 0.4 + 1.1 + 0.3 + 1.5 + 5 + 0.2 = 18.5 ms
(10% for CJ2 CPU Units)
(10% for CJ2 CPU Units)
Processing time details
Time slice peripheral servicing
execution time
Set peripheral servicing time
(Default: 4% of CPU Unit cycle
time)
Calculated value
Section 10-5