It has been proven that Internet of Things (IoT) sensor networks can improve efficiency by utilizing real-time data and reduce downtime through predictive maintenance, thereby changing the game rules for industrial automation, renewable energy, and intelligent lighting systems. However, as the system is equipped with more and more wireless sensor nodes, designers will face the challenge of how to reliably expand these Industrial Internet of Things (IIoT) networks in harsh environments, while minimizing implementation and operational costs, addressing network congestion issues, and ensuring security.
This article outlines the various issues that designers face when expanding IIoT networks. Then introduce Digi's low-power Bluetooth (BLE) module and development kit, and explain how to quickly and effectively solve the above problems using these products.
Challenges faced in expanding wireless IoT infrastructure
IIoT involves a wide range of application areas, among which data collection is crucial for improving efficiency and predictability. Taking intelligent lighting as an example, wireless sensors collect ambient light and occupancy data, adjust usage in real-time, and save energy consumption and related costs.
Similarly, renewable energy applications utilize remote IoT sensor networks to monitor various energy sources such as solar and wind energy. These network monitoring systems monitor the status and performance, predict faults, and dynamically adjust grid power supply.
Like other fields that use industrial automation technology, collecting data from moving parts is key to implementing predictive maintenance. Installing hundreds of wireless sensors throughout the entire industrial system can provide fine-grained data information, thereby optimizing processes, reducing maintenance work, and lowering operating costs. However, as the scale of sensor networks expands, performance issues may arise, such as
Interference: Industrial environments are typically affected by high-level electromagnetic interference (EMI) generated by motors, switch mode power supplies, and arc welding equipment. This EMI can cause intermittent reduction in data transmission rate, which seriously affects the effective transmission of data.
Network overcrowding: Operating multiple wireless devices at close range can cause network saturation, resulting in greater latency and connection interruptions, which can hinder real-time detection and increase power consumption.
Security: Hacker attacks are a major threat to critical infrastructure such as energy or logistics, therefore sensor networks must have strong security. However, as the number of endpoints increases, the number of vulnerabilities also increases.
Another challenge is to integrate wireless sensors with standard industrial protocols. This integration may involve data reformatting and compression to reduce network traffic; However, these processes need to be carried out on devices, and as the number of sensors and protocols increases, costs and power consumption will also rapidly rise. In addition, the number of sensors on site is constantly increasing, making maintenance work increasingly complex, as non predictive maintenance of sensors is required whether it is a malfunction or simply battery replacement.
Bluetooth technology shines in large-scale IIoT
Among numerous IIoT wireless protocols, Bluetooth is a powerful solution that can address a range of issues as sensor networks expand. For example, by using adaptive frequency hopping (AFH), Bluetooth technology can improve its anti-interference ability. AFH will divide the data into small packets and transmit them through multiple frequencies, and then recombine them at the receiving end. Any lost data packet will be resent after sending a loss report to ensure communication reliability and prevent the loss of long information due to electromagnetic interference.
To avoid excessive network congestion, Bluetooth technology supports controlling the transmission power relative to the receiver after the connection is established. This method, combined with AFH, helps to save energy while minimizing EMI, allowing hundreds of wireless devices to operate in the same space. In addition, Bluetooth technology also reduces security vulnerabilities by using powerful encryption and elastic verification protocols.
In IIoT deployment, large-scale Bluetooth sensor networks primarily communicate through gateways designed specifically for pairing with multiple devices. By building sensor nodes around Bluetooth, developers can achieve seamless interoperability with smartphones and tablets, simplifying setup and diagnostic work and improving maintenance efficiency.
However, in order for wireless networks to adapt to IIoT, Bluetooth sensor networks must also reliably adapt to harsh deployment conditions, reduce power consumption, improve cost-effectiveness, and simplify maintenance.
Building an IIoT network using industrial grade BLE modules
By using Digi's XBee 3 BLU BLE 5.4 module and development kit, designers can quickly and directly deploy wireless IIoT networks. This module has an industrial grade temperature range of -40 ° C to+85 ° C and operates in idle and sleep modes, thus meeting reliability and power consumption requirements. The current consumption of the XBee 3 BLU device is 7.5 milliamps (mA) and 8 microamperes (µ A) respectively, which can support the long-term installation of remote sensors in difficult to access locations, so valuable information can be obtained without the need for regular battery replacement.
Other features include:
The maximum data transmission rate is 2 megabits per second (Mb/s), which provides a detailed understanding of the operation of complex machinery
The maximum transmission power is+8 decibel milliwatts (dBm), which can achieve high fidelity communication within a direct view range of up to 15 meters indoors or up to 300 meters outdoors
13 digital I/O and 4 10 bit analog-to-digital converters (ADCs) inputs, flexible integration with different devices and sensor interfaces
1.71 V to 3.8 V power supply, flexible power supply selection
Digi TrustFence Security for device and network protection, including secure boot, protected hardware ports, and device authentication
Advanced MicroPython programmability enables rapid development of data processing and decision-making systems on devices
Obtained comprehensive regulatory certifications from North America (FCC, IC) and Europe (ETSI)