Omron SYSMAC CS1W-CLK11 Operation Manual page 228

Message Delay Times
212
Reception Processing
Commands: 1.3 ms
Responses: Number of words transferred × 0.00075 ms + 2 ms
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 receiving 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:
Source node execution:
Destination node execution:
Number of words:
Data link:
Link Unit servicing (source node) × 2
Link service processing (source node) × 2
Transmission processing (command)
Communications cycle × 2 (see note)
Transmission delay (command)
Reception processing (command)
Link servicing interval (destination node)
Link service processing (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 RECV command is sent.
Section 8-4
2 Mbps
32
32
4
Synchronous
Asynchronous
256
Inactive
PC cycle time (source node) × 2
1 ms × 2 = 2 ms
2 ms
(600 × 4 + 110 × 32 + 320 × 0 + 4 ×
0 + 2,290) × 2 = 8,210 µs × 2 ≅
16.4 ms
0.112 ≅ 0.1 ms
1.3 ms
As required by Programming
Device (destination node)
1 ms
0.00075 × 256 + 2 = 2.192 ≅
2.2 ms
0.008 × 256 + 0.112 = 2.16 ≅
2.2 ms
0.00075 × 256 + 2 = 2.192 ≅
2.2 ms
PC cycle time (source node) × 2
+ Peripheral servicing time (des-
tination node) + 29.4 ms