Omron SYSMAC CS1W-RPT01 Operation Manual page 296

Message Delay Times
Reception Processing
Commands: 2.3 ms
Responses: Number of words transferred × 0.00125 ms + 2.3 ms
The I/O response time might increase due to noise or restrictions on the num-
ber 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 receiving 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 links:
Link Unit servicing (source node) × 2
Transmission processing (command)
Communications cycle time × 2 (See note.)
Transmission delay (command)
Reception processing (command)
Link Unit servicing (destination node)
Transmission processing (response)
Transmission delay (response)
Reception processing (response)
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 executed.
2 Mbps
32
32
256
Halted
PLC cycle time (source node) × 2
3 ms
(600 × 4 + 110 × 32 + 320 × 0 + 4 ×
0 + 2,290) × 2 = 8,210 µs × 2 ≅
16.4 ms
0.112 ≅ 0.1 ms
2.3 ms
PLC cycle time (destination node)
0.00125 × 256 + 3 = 3.32 ≅ 3.3
0.008 × 256 + 0.112 = 2.16 ≅ 2.2
0.00125 × 256 + 2.3 = 2.62 ≅ 2.6
PLC cycle time (source node) ×
2 + PLC cycle time (destination
node) + Peripheral servicing
time (destination node) +
29.9 ms
Section 8-4
271