Omron CS1W-RPT01 Manuale Utente
272
Message Delay Times
Section 8-4
interval (destination node) + Transmission processing (response) + Communi-
cations cycle + Transmission delay (response) + Reception processing
(response) + Link Unit servicing interval (source node).
cations cycle + Transmission delay (response) + Reception processing
(response) + Link Unit servicing interval (source node).
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.
approximately 1 ms for Controller Link Units.
Transmission Processing
Commands: 2 ms
Responses: Number of words transferred
Responses: Number of words transferred
×
0.00125 ms + 3 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.
Responses: Transmission delay time is calculated according to the number of
words to be transferred.
Reception Processing
Commands: 2.3 ms
Responses:
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.
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:
tion receiving 256 words of data in a system with 32 nodes. Network specifics
are detailed below:
Baud rate:
2 Mbps
Max. node number:
32
Number of nodes:
32
Number of polled nodes: 4
Number of words:
Number of words:
256
Data links:
Halted
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