Message Service Delay Times - Omron SYSMAC 3G8F7-CLK13-E Operation Manual

Message Service Delay Times

8-4

Message Service Delay Times

(ClkSendFins)
Send processing at node
#1 (command)
Receive processing at
node #2 (command)
2. The data send processing time for the area marked by the asterisk (*) in
the diagram will be affected by the processing capacity of the computer
that is used.
3. The communications cycle time may fluctuate.
4. Refer to the Controller Link Units Operation Manual (W309) for details on
the time required for data exchanges between the Controller Link Unit and
the PC.
The following diagram illustrates the maximum message service transmission
delay time. In this example, the MEMORY AREA READ FINS command is
sent to the PC at node #2 (a CS-series PC) by the user application at the
computer at node #1.
User application
Transmission delay
(command)
Maximum transmission delay
Maximum transmission delay time = Send processing (node #1) + Communi-
cations cycle time + Transmission delay time (for command) + Receive pro-
cessing (node #2) + PC processing time (node #2) + Send processing (node
#2) + Communications cycle time + Transmission delay time (for response) +
Receive processing (node #1)
Send/Receive Processing at Node #1
Depends on the processing capacity of the computer that is used.
Communications Cycle Time
See 8-2 Communications Cycle Time (on page 128).
Transmission Delay Time
Transmission delay time varies with the baud rate.
Baud rate
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
(ClkRecvFins)
Receive processing at
node #1 (response)
Transmission delay
(response)
Communications cycle
Send processing at node
#2 (response)
PC at node #2
Transmission delay time
Section 8-4
Computer at
node #1
135