Figure 6: Banner’s Sure Cross DSX80 Performance wireless I/O network solution includes a gateway and one or more sensor nodes. (Image source: Banner Engineering)
The basic system architecture comprises a Gateway and one or more Nodes (Figure 6). Implementing a Sure Cross DX80 Performance wireless network involves three elements: the network topology, master and slave relationships, and the time division multiple access (TDMA) architecture. A star topology is used where the master maintains a separate connection with each node. If the connection between a node and the master fails, connectivity with the rest of the nodes is unaffected. A gateway like the DX80G2M6- QC is the master device and initiates all communication with the slave devices. A gateway that uses a Modbus RTU RS-485 connection acts as a slave to a Modbus RTU host controller. A single wireless network can include up to 47 slave nodes.
Slave devices can be wireless nodes like the DX80N9Q45DT dual thermistor temperature sensor node, the DX80N9Q45PS150G pressure sensor node, or vibration and humidity sensors. Slave devices can’t initiate communication with the gateway or communicate with each other. A serial data radio like the DX80SR9M-H can be added to extend network coverage to accommodate physically large installations. TDMA is the key to combining robust connectivity with minimal energy consumption. The TDMA controller in the gateway assigns each node a specific time to send and receive data. The gateway always has device ID number 0. Nodes may be numbered in any order using device IDs 1 through 47.
Setting specific communication times for individual nodes optimizes efficiency by eliminating the possibility of conflicts between nodes. It also enables nodes to enter a low-power state between communications, only waking up at the assigned time. Turning off the radio between transmissions conserves power and extends the operating life of battery-powered nodes.
Conclusion
Access to multiple communication protocols, like IO-Link, Modbus, EtherNet/IP, and so on, is necessary to support the efficient operation of Industry 4.0 and IIoT networks. Banner Engineering provides designers with a comprehensive selection of IO-Link hubs, converters, and masters in various form factors to support optimized communication solutions.
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