
Message Transmission
Section 6-1
84
6-1
Message Transmission
Message transmission is a function that supports the asynchronous ex-
change of data between nodes. The basic functions of message transmis-
sions are explained here.
1,2,3...
1.
When a node receives the token, it can send one (and only one) message
frame before transmitting cyclic data.
2.
The volume of data that can be transmitted in one message frame is 1,024
bytes max.
3.
An algorithm is used so that the allowable refresh cycle time for cyclic
transmission is not exceeded.
4.
A message transmission can be sent either to a single destination node as
a 1:1 transmission or broadcast to all nodes on the network as a 1:N trans-
mission.
5.
In 1:1 message transmissions, the destination node has an acknowledge-
ment function to check that data has been received successfully. No re-
sponse is provided by the source node for 1:N message transmissions.
Supported Messages
Request
Response
1:1 message transmission
1:N message transmission
Request
Reception
Reception
Reception
Message
1:1 transmission
1:N transmission
Client function
Server function
Client function
Server function
Read byte block
No
No
No
No
Write byte blocK
No
No
No
No
Read word block
Yes (See note 1.)
Yes
No
No
Write word block
Yes (See note 1.)
Yes
No
No
Read network parameter
No
Yes
No
No
Write network parameter
No
No
No
No
Run/stop command
No
No
No
No
Read profile
No
Yes
No
No
Read communications log data
No
Yes
No
No
Clear communications log data
No
Yes
No
Yes
Echoback message
Yes*
Yes
No
No
Содержание CJ1W-FLN22
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