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Message Delay Times Section 8-4
Max. transmission delay = Link servicing interval (source node) + Link service
processing (source node) + Transmission processing (command) + Communi-
cations cycle + Transmission delay (command) + Reception processing (com-
mand) + Link servicing interval (destination node) + Link service processing
(destination node) + Transmission processing (response) + Communications
cycle + Transmission delay (response) + Reception processing (response) +
Link servicing interval (source node) + Link service processing (source node)
.
Link Servicing Interval (Source and Destination Nodes)
Link servicing depends on the execution mode of the PLC. The execution
modes on the source and destination modes need not be the same.
For synchronous execution, links are serviced once per PLC execution cycle.
For asynchronous execution, links are serviced according to the peripheral
servicing interval. Refer to the CVM1 and CV-series PLCs Operation Manual:
Ladder Diagrams (W202) for details.
Link Service Processing (Source and Destination Nodes)
Link service processing is the same as the PLC’s peripheral servicing and is
approximately 1 ms for Controller Link Units.
Transmission Processing
Commands: 2 ms
Responses: Number of words transferred
× 0.00075 ms + 2 ms
Communications Cycle Time (with Data Links Inactive
See 8-2 Communications Cycle Time (on page 251).
Transmission Delay Time
Transmission delay time varies with the baud rate.
Note Commands: Transmission delay time is calculated assuming that the number
of words to be transferred is zero.
Responses: Transmission delay time is calculated according to the number of
words to be transferred.
RECV (193)/RECV(98)
executed
Data stored
Link service interval (source node)
Transmission processing (command)
Reception processing (response)
Communications cycle
Reception processing (command)
Link service interval (destination mode)
Transmission delay (command)
Link service processing (source node)
Transmission delay (response)
Transmission processing (response)
Link service processing (destination node)
Maximum transmission delay
Link service processing (source node)
Baud rate Transmission delay time
2 Mbps Number of words transferred × 0.08 + 0.112 ms
1 Mbps Number of words transferred × 0.016 + 0.224 ms
500 Kbps Number of words transferred × 0.032 + 0.448 ms