Omron SYSMAC CS1W-RPT01 Operation Manual page 294

Message Delay Times
Link Servicing Interval (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 × 0.00125 ms + 3 ms
Responses:
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 × 0.08 + 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 × 0.00125 ms + 2.3 ms
Responses:
Note The I/O response time can increase due to noise or restrictions on the number
of frames that can be transmitted while the data link is 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 number:
Number of nodes:
Number of polled nodes: 4
Number of words:
Data link:
Link Unit servicing (source node)
Transmission processing
Communications cycle time (See note.)
Transmission delay (command)
Reception processing
Link servicing interval (destination node)
Total (max. transmission delay)
Note This communications cycle time is calculated assuming that there is no node
that transmits event frames before the SEND command is issued.
Transmission delay time
2 Mbps
32
32
256
halted
PLC cycle time (source node)
0.00125 × 256 + 3 = 3.32 ≅ 3.3 ms
600 × 4 + 110 × 32 + 320 × 0 + 4 ×
0 + 2,290 = 8,210 µs ≅ 8.2 ms
0.008 × 256 + 0.112 = 2.16 ≅
2.2 ms
0.00125 × 256 + 2.3 = 2.62 ≅
2.6 ms
PLC cycle time (destination node)
PLC cycle time (source node) ×
2 + PLC cycle time (destination
node) + Peripheral servicing
time (destination node) +
16.3 ms
Section 8-4
269