Omron CS1W-RPT01 Link Servicing Interval Source and Destination Nodes, Transmission Processing

Message Delay Times Section 8-4

Note Be sure to take into account the time required for data links and program exe- cution, which are not included in the following example.

SEND(192)/SEND(90) executed

Link Unit servicing (source node)

Link Service processing (source node)

Transmission processing

Communications cycle

Transmission delay

Reception processing

Link Service processing

(destination node)

Link Service processing

(source node)

Max. transmission delay

Data stored

Max. transmission delay = Link Unit servicing interval (source node) + Link service processing (source node) + Transmission processing + Communica- tions cycle time + Transmission delay + Reception processing + Link Unit ser- vicing interval (destination node) + Link service processing (destination 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 operation manual for the PLC for details. Refer to the CVM1 and CV-series PLCs Operation Manual: Ladder Diagrams (W202) or CS/CJ-series PLCs Instructions Reference Manual (W340) 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

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.

Baud rate	Transmission delay time
2 Mbps	Number of words transferred ⋅	0.008 + 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

266