This paper introduces the communication between Siemens PLC S7-300[1] system and iFIX[2] host computer software and their combination in remote communication. The tank farm and loading area are not in the same place and are far away from each other. In order to realize automatic loading, the tank farm instrument and loading system must communicate. This paper describes how the tank farm instrument can be controlled in the loading area and the communication between the two can be realized with only one pair of optical fibers and the devices at both ends, which not only avoids the attenuation of the instrument cable signal due to the long distance, but also saves costs.
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