9-29.1 An Overview of the Transparent CommunicationFunction9.1.1 What is the Transparent Communication Function?With the transparent communication function, data can be sent and received transparently between acomputer and a programmable controller, and between two programmable controllers.Communication data can be stored to and retrieved from the programmable controller by reading fromand writing to the reception buffer of the shared memory in the ET-LAN unit. Communication requestsand other commands are executed by the bits of the handshake area in the I/O or shared memory beingturned on and off.Key Point:- With the transparent communication function, the programmable controller or computer specifies an IPaddress to open a connection with the communication destination.- After the connection has been opened, communication processing on the programmable controller sideis carried out by data being read from or written to the communication buffer of the shared memorythrough the ladder program, and by communication requests being executed.- Up to eight connections can be used on a single ET-LAN unit by using the transparent communicationfunction in conjunction with MEWTOCOL communication functions (computer linking and data transfer).
