Omron SYSMAC CS1W-RPT01 Operation Manual page 290

Message Delay Times
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 255).
Transmission Delay Time
Transmission delay time varies with the baud rate.
Baud rate
Number of words transferred × 0.008 + 0.112 ms
2 Mbps
Number of words transferred × 0.016 + 0.224 ms
1 Mbps
Number of words transferred × 0.032 + 0.448 ms
500 Kbps
Reception Processing
Number of words transferred × 0.00075 + 1.3 ms
Note The I/O response time can increase due to noise or restrictions on the number
of frames that can be transmitted while data links are operating.
Example
In this example, the maximum transmission delay is calculated for an instruc-
tion sending 256 words of data in a system with 32 nodes. Network specifics
are detailed below:
Baud rate:
Max. node address:
Number of nodes:
Number of polled nodes per comm cycle: 4
Source node execution:
Destination node execution:
Number of words:
Data link:
Transmission delay time
2 Mbps
32
32
Synchronous
Asynchronous
256
Inactive
Section 8-4
265