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Message Service Transmission Delay Section 10-5
Example Calculation 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 Calculated value
CPU Bus Unit service cycle (local
node, 1)
10 ms
CPU Bus Unit service processing
time (local node, 1)
0.4 ms
Send processing (command) 0.550 ms 0.5 ms
Transmission delay (command) 0.0118 ms 0.1 ms
Receive processing (command) 0.704 ms 0.7 ms
CPU Bus Unit service cycle (remote
node)
15 ms
CPU Bus Unit service processing
time (remote node)
0.6 ms
Send processing (command) (256 × 0.002) + 0.550 = 1.062 1.1 ms
Transmission delay (command) (256 × 0.0013) + 0.0118 = 0.3446 0.3 ms
Receive processing (command) (256 × 0.003) + 0.704 = 1.472 1.5 ms
CPU Bus Unit service cycle (local
node, 2)
10 ms
CPU Bus Unit service processing
time (local node, 2)
0.4 ms
Maximum transmission delay 10 + 0.4 + 0.5 + 0.1 + 0.7 + 15 + 0.6 + 1.1 +
0.3 + 1.5 + 10 + 0.4 = 40.6 ms
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