Omron CJ1W-FLN22, Руководство по эксплуатации, Страница: 164 / 277

Message Service Transmission Delays Section 8-5
138
Receive
The transmission delay for the SEND(090) instruction can be calculated using
the following equation:
Transmission delay = Local node service cycle
×
2 + local node service pro-
cessing time
×
2 + communications cycle time
×
2 + token holding time
×
2 +
remote node service cycle
×
2 + remote node service processing time
×
2
• CPU Bus Unit Service Cycle
One scan of CPU Unit.
• CPU Bus Unit Service Processing Time
CPU Unit peripheral processing: This is the time required to process
CPU Bus Units and is approximately 1 ms for FL-net Units.
• Communications Cycle Time
Time taken by the token to do one rotation.
Note . 1. The actual operating environment can cause transmission delays larger
than those calculated with the methods given here. Among the causes of
longer delays are the following: traffic on the network, traffic through the
FL-net Unit, as well as the parameters and system configuration of the FL-
net network.
2. The CPU data set processing time is the standard when the peripheral ser-
vice time is set in the CPU Unit System Setup to the default of 4%. As this
value is increased, the processing time is shortened.
SEND(090) instructions
executed from user
program
CPU Bus Unit Service Cycle (local node)
CPU Bus Unit Service Processing (local node)
Service Processing
(local node)
Communications Cycle Time
Service Processing (remote mode)
CPU Bus Unit Service Cycle (remote node)
CPU Bus Unit Service Processing (remote node)
Max. delay