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5 ACCESS FUNCTION USING NETWORK MODULE
5.3 Transient Transmission
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5.3
Transient Transmission
This section shows transient transmission using a C Controller module.
There are two methods available for transient transmission: message transmission using the channel of the network module
which is controlled by a C Controller module, and direct access to devices of another station.
Message communication
This method is used to read/write data using the channel of a controlled network module from a C Controller module.
The message communication function allows data communication similar to link dedicated instructions i.e. SEND/RECV
instructions.
Data flow
The following figure shows the data flow for message communication.
(1): The sending side C Controller module sends data by specifying the channel used in the own station and the channel used
in the target station with the message send function of a user program.
(2): From the sending side channel, data is transmitted to the receiving side channel.
(3): The receiving side C Controller module (another station) reads messages from the receiving side channel with the
message receive function of a user program.
• The message communication function can be used even if CPU module on sending station or receiving
station is other than C Controller module. For the target CPU module, use the SEND/RECV link dedicated
instruction or a function equivalent to it.
• If the data is transmitted with acknowledge to be received on the same channel of receiving station, it is
necessary to transmit next data only after acknowledgement of previously sent data is received i.e.
receiving station has read the previously sent data using message receive function (or RECV instruction).
An error will occur if the sending station transmits data on the same channel of the receiving station before
the acknowledgement is received i.e. data on the receiving station has not been read. In case of an error,
retry data transmission.
(1)
(2)
(3)
C Controller module
(Sending side)
Network
module
Network
module
C Controller module
(Receiving side)
Channel 1
Channel 1
User program
Channel 2
Channel 2
User program
Channel 3
Channel 4
Channel 5
Channel 8
Channel 8
Network No.1
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