Panasonic FP2 ET-LAN, Technical Manual

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9-2
9.1 An Overview of the Transparent Communication
Function
9.1.1
What is the Transparent Communication Function?
With the transparent communication function, data can be sent and received transparently between a
computer and a programmable controller, and between two programmable controllers.
Communication data can be stored to and retrieved from the programmable controller by reading from
and writing to the reception buffer of the shared memory in the ET-LAN unit. Communication requests
and other commands are executed by the bits of the handshake area in the I/O or shared memory being
turned on and off.
Key Point:
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With the transparent communication function, the programmable controller or computer specifies an IP
address to open a connection with the communication destination.
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After the connection has been opened, communication processing on the programmable controller side
is carried out by data being read from or written to the communication buffer of the shared memory
through the ladder program, and by communication requests being executed.
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Up to eight connections can be used on a single ET-LAN unit by using the transparent communication
function in conjunction with MEWTOCOL communication functions (computer linking and data transfer).