7
The example illustrate on above is the simplest server mode
application. Work station A and work station B are master that can
send the command message actively to FBs-PLC, Upon receiving the
command message, Ethernet module will send the message thru the
port4 to FBs-PLC. When there are more than one message intended
to send to FBs-PLC, the Ethernet module will save the additional
messages into the message queue then send it to FBs-PLC in orders
(Must wait for the reply message before send the next command)
therefore there will no conflicts.
When work at this mode, there is no need to write any program in
PLC for operation.
Multiple PLC connection
Under this application architecture, The PLCs connect the Ethernet
module with the RS485 interface of port4. The work station A and work
station B are master that can send the command message actively to
FBs-PLC, Upon receiving the command message from the network,
Ethernet module will re-send the message to FBs-PLC thru port4 interface.
When the message appears at RS485 line, each PLC will compare the
target station embed in message against its own station ID. If the result is
true then it will reply according to the command message. The reply
message will intercept by the Ethernet module and re-pack then send to
the network. When there are more than one message intended to send to
FBs-PLC, the Ethernet module will save the additional messages into the
message queue then send it to FBs-PLC in orders (Must wait for the reply
message before send the next command) therefore will not have conflicts.
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