Omron CS1W-RPT01 Benutzerhandbuch

The number of bytes in each message differs according to the instruction
being issued.

Communications conditions are as follows:

Transmission medium: 

Twisted-pair cables

Baud rate: 

2 Mbps

Network parameters: 

Defaults

Max node address: 

32

Polled nodes per comm cycle: 

4

Event-frames per comm cycle: 

35

Network configuration: 

8 nodes

Nodes that send messages: 

2 nodes

Bytes in all messages sent: 

2,012 

×

 2 bytes

In this example, B to E in the equation have the following values.

B:

4

C:

8

D:

2

E:

4,024

The communications cycle time is thus as follows:

600 

×

 4 + 110 

×

 8 + 320 

×

 2 + 4 

×

 4,024 + 2,290 = 22,306 (

µ

s)

≅

 22 (ms)

When accurate communications timing is required, you need to understand
data exchange timing and the time required for data transmission and recep-
tion via data links. Use the information described in this section as reference
information for system construction.

This section describes data exchange timing for data links between the Con-
troller Link Unit and the PLC’s CPU Unit. Data exchange is executed as inter-
rupt processing during CPU Bus Unit or Programming Device/Host Link
servicing performed by the CPU Unit. This interrupt processing is executed
each time data exchange between the local node and each node connected
via a data link is completed.

Data exchange timing differs depending on the CPU Unit model and the CPU
Unit the Execute Process (asynchronous or synchronous) specified in PLC
Setup, as described below.

SEND

Number of words to be sent 

×

 2 

+ 18

14

RECV

18

Number of words to be 
received 

×

 2 + 14

CMND

Number of bytes in command 
data + 10

Number of bytes in response 
data