Omron CJ1W-EIP21 - 10-2010 Operation Manual page 328

Message Service Transmission Delay
Example Calculation
300
In this example, RECV(098) is used to receive 256 words of data from another
PLC. The maximum transmission delay is calculated based on the following
operating conditions.
• 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: 15 ms
• Remote node's CPU execution mode: Normal
• Remote node's CPU peripheral servicing time: Default (4%)
• Baud rate: 100Base-TX
Item
CPU Bus Unit service cycle (local
node, 1)
CPU Bus Unit service processing
time (local node, 1)
Send processing (command)
Transmission delay (command)
Receive processing (command)
CPU Bus Unit service cycle (remote
node)
CPU Bus Unit service processing
time (remote node)
Send processing (command)
Transmission delay (command)
Receive processing (command)
CPU Bus Unit service cycle (local
node, 2)
CPU Bus Unit service processing
time (local node, 2)
Maximum transmission delay
Calculated value
10 ms
0.4 ms
0.550 ms ≅ 0.5 ms
0.0118 ms ≅ 0.1 ms
0.704 ms ≅ 0.7 ms
15 ms
0.6 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
10 ms
0.4 ms
10 + 0.4 + 0.5 + 0.1 + 0.7 + 15 + 0.6 + 1.1 +
0.3 + 1.5 + 10 + 0.4 = 40.6 ms
Section 10-5