Modbus/TCP Master-to-Master Communication
A large oil and natural gas platform in the North Sea was expanding their facility capabilities by adding a massive system module (over 1.5 million lbs) to the existing platform infrastructure. In order for the two systems to communicate seamlessly with one another, the proper communication channels needed to be established.
Control systems on each structure were configured to communicate with each other through a serial Modbus RTU RS-232 or RS-485 channel. However, the Modbus device configuration on each side was designed to communicate as a master, while traditional Modbus communication takes place between a master and a slave.
Each structure’s respective developers had invested substantial resources into their control systems, so the systems integrator needed to find a way to overcome this obstacle by converting one configuration to act as a slave in the most cost-effective way possible – or by making two Modbus master devices communicate with one another. Many industry experts have expressed that master-to-master Modbus communication is impossible, but Comtrol had already developed an innovative solution to make a Modbus master communicate with another master.
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