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EZ-NET Network, COM-LINK Serial
MN05013005E
344
data is written to the operand image of the program and the
send data is read from the image. The program runs through
the next cycle with this data.
Reading and sending the network data from the CPU
The network CPU of the station reads every message on the
network. If the message is relevant to the station, it is
accepted into a message memory.
If the content of a send message changes, it is sent.
Transmission only occurs when there is no message on the
network.
EZ-NET is configured so that every station can send its
messages. This means that the station must observe a pause
time between sending messages. The pause time increases
the higher the number of stations and the lower baud rate
setting.
The number of stations is recognized by every station via a
“sign of life” signal.
Signs of life of the individual stations and diagnostics
The inputs and outputs message type is used as a “sign of life”
recognition to ensure that the state of a station can be
recognized by other stations. The states of the inputs and
outputs are sent cyclically and at the set baud rate,
irrespective of the SEND IO setting. If the inputs and outputs
of a station are not recognized by other stations after a time
determined by the baud rate, the station is deemed to be
disconnected until the next “sign of life” is recognized.
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The following applies to fast message transfer:
• Set the fastest possible baud rate to suit the network
length and cable cross-section.
• Fewer messages means faster messages.
• Avoid program downloads during the RUN mode.
