Download 1 - Sharp

FL-net
Message transfers
Outline of message transfer process
The message transfer process is a function that allows asynchronous data to be
exchanged between nodes.
The basic operation of the message transfer process is shown below.
When a node receives a token, it will send a maximum of one frame of
message data before the cyclic frame data sending.
A maximum of 1024 bytes can be sent at one time.
The ZM-80NU uses an algorithm to prevent nodes from exceeding the allowable refresh cycle interval for message transfers.
It has a data send confirmation function used to check whether a target node
has correctly received the data in a "1: 1" message transfer.
Request
Response
Node 2
Node 4
Node 3
Node 1
Table of ZM-80NU support messages
Request
Response
(Client function)
(Server function)
1 Read/write byte-block data
x
x
2 Read/write word-block data
O
x
3 Read network parameters
x
O
4
Write network parameters
x
x
5
Start, stop commands
x
x
6 Read profile
x
O
7 Read communication log data
x
O
8
x
O
9 Return message
x
O
0
x
x
No.
Message
Clear communication log data
Transfer transmission message
Client function: A function used to send request messages and receive response frames.
Server function: A function to create and send response frames to request messages that are
received.
10-12