PLC-IoT and Smart Home: A Fundamental Reconstruction from "Connectivity" to "Intelligent Connectivity"

From June 9th to 12th, 2026, the 23rd Guangzhou International Building Electrical Technology Exhibition (GEBT) was held in Guangzhou. At the exhibition, KingPAC showcased for the first time its comprehensive solution for the Internet of Things (IoT) across all scenarios, based on its independently controllable PLC-IoT technology. Its core concept directly addresses industry pain points: no new wiring or complex debugging is required; simply plug it in to have a stable, secure, and intelligent IoT system .

This demonstration sends a clear signal to the industry: PLC-IoT is evolving from an "alternative communication solution" into an "invisible infrastructure" for large-scale commercial deployment of smart homes .

I. Underlying Communication Logic: Wires vs. Air Interface

To understand why PLC-IoT has become a focal point, we first need to understand its fundamental differences from wireless solutions.

Wireless modules (Wi-Fi, Zigbee, Bluetooth Mesh) rely on electromagnetic waves to propagate signals and operate in the 2.4GHz/5GHz frequency band. When the signal passes through walls, it is significantly attenuated when encountering load-bearing concrete walls and metal cabinets; in the unlicensed 2.4GHz band, microwave ovens, neighboring routers, etc., cause serious co-channel interference.

PLC-IoT is entirely different. It uses the existing 220V/380V power lines in the home as the data transmission medium , superimposing communication signals in the 0.7–12MHz frequency band . The signal is conducted along the power lines and is not affected by physical obstructions from walls, floors, or metal structures . As long as the circuit is powered, the communication link exists stably .

Key conclusion: Wireless modules are limited by signal attenuation and frequency congestion in physical space, while PLC-IoT relies on the physical closed loop of power lines, naturally possessing the fundamental advantage of penetrating walls and being unobstructed. This is the most fundamental and insurmountable structural difference between the two.

II. Measured Data: Quantitative Difference in Stability

The aforementioned underlying differences are directly reflected in the measured performance.

Regarding latency , the PLC-IoT end-to-end response latency is consistently below 50 milliseconds . In a typical three-bedroom apartment, Huawei's solution maintains a response latency consistently below 50ms, with a signal strength standard deviation only one-third that of Wi-Fi solutions . Wireless solutions exhibit greater latency fluctuations, with typical values for Wi-Fi/Zigbee ranging from 100 to 400 milliseconds .

In terms of communication success rate , PLC-IoT has a nominal communication success rate of up to 99.99% .

In terms of device connectivity , a single PLC-IoT host supports 128–384 device nodes . KingPAC's solution can stably connect over 1000 device nodes per network , supporting more than 15 levels of relays . Wi-Fi typically only supports 30–50 devices .

Key findings: In the three core dimensions of latency, success rate, and device capacity, PLC-IoT demonstrates a quantifiable systemic advantage over wireless modules. This is not a "slightly better" advantage, but rather a difference of orders of magnitude.

III. Independent Verification of Academic Research

The academic research "Research on Smart IoT Application Architecture under the Advantages of PLC-IoT Technology", published in Hebei Industrial Science and Technology in 2024, systematically compared the three technologies .

The research results show that home systems using PLC-IoT technology achieve stable long-distance communication, which is impossible with ZigBee technology, reducing costs by approximately 30% compared to KNX technology, and improving the overall system's anti-interference capabilities . The study clearly concludes that PLC-IoT technology is more suitable than ZigBee and KNX technologies for realizing smart homes, building automation, and other intelligent IoT applications .

Key findings: Academic research, from an independent third-party perspective, has verified the comprehensive advantages of PLC-IoT over wireless and traditional wired solutions in terms of stability, cost-effectiveness, and anti-interference capabilities.

IV. Engineering Advantages: "Network-with-Power" System Eliminates the Need for Wiring

Although wireless modules do not require wiring, they face multiple hidden costs in actual projects : large houses require the deployment of multiple Mesh nodes to ensure signal coverage; and the walls of old houses cause severe attenuation of 2.4GHz/5GHz signals.

The engineering advantage of PLC-IoT lies in its "no wiring required"—simply install a smart host in the distribution box to achieve whole-house communication coverage through existing wiring . This solves the problem of wireless communication being greatly affected by the surrounding environment, and the elimination of wiring eliminates issues such as the need for separate wiring for industrial fieldbuses, resulting in messy wiring, aging lines, and difficult maintenance.

KingPAC's data presented at GEBT 2026 is even more convincing: typical hotel rooms or offices can complete intelligent upgrades in just 2 hours without breaking walls or shutting down operations, reducing the renovation period by 90% . Their solution can directly reuse existing old power lines within the building, without distinguishing between copper or aluminum cores or requiring any rewiring .

Key findings: The "no wiring required" feature of wireless modules is often offset by signal coverage issues in practical engineering; the "no wiring required" feature of PLC-IoT is truly "plug and play"—this advantage has decisive commercial value in the existing housing renovation market.

V. Network Outage Availability: The Reliability Advantages of Local Deployment

The PLC-IoT system is deployed and operates entirely locally—all control logic, scene linkage, and data storage are executed on the local gateway, ensuring full functionality even during network outages . Both Huawei's whole-house smart home system and Haier's smart home system emphasize "uninterrupted connectivity during network outages . "

If a purely wireless solution relies on the cloud to execute commands, the devices will lose their ability to operate in the event of a broadband outage . Even though Zigbee 3.0 itself supports local networking, if the manufacturer has not performed offline optimization, it may still be affected by the gateway's network status.

Key findings: Local deployment of PLC-IoT enables it to maintain core functions even in network outage scenarios; while cloud-based wireless solutions may be completely paralyzed when the network is out of service.

VI. Market Validation: From Industry Consensus to Large-Scale Deployment

There is a growing consensus in the industry that as smart homes move from "single-product intelligence" to "whole-house intelligence," and from the "pre-installed market" to "upgrades of existing systems," PLC-IoT, with its underlying advantage of "network access wherever there is electricity," is becoming a key bridge connecting these two markets .

Huawei's HarmonyOS Smart Home adopts a triple architecture of "PLC-IoT + StarFlash + Wi-Fi 7," with the PLC utilizing existing wiring to transmit data. Haier Smart Home leads the way with its PLC-based wall-mounted solution, boasting self-produced products across all categories, 3,300 stores, and a decade of dedicated concierge services. Brands like Midea Smart Home have also launched PLC-based post-installation whole-house smart solutions.

$11.7 billion in 2025 and is projected to reach $20.9 billion by 2032 , representing a compound annual growth rate of 8.6% .

VII. Oufexin Technology: Full-Stack PLC Solutions Empower Industry Implementation

As a professional company deeply involved in the field of PLC technology, Shenzhen Qogrisys Technology Co., Ltd. has formed a complete technology matrix in this field, from chip-level modules to full-stack system solutions.

S130N-ISI Series – Fully Integrated PLC Module Based on Lianxintong VC6330

The S130N-ISI is a fully integrated power line communication module, internally integrating a 32-bit ARM Cortex-M3 MCU, a 32-bit DSP, embedded Flash, and 1MB SRAM . The module uses an LCC package, featuring an ultra-miniaturized size and compact structure; it integrates an on-chip wire driver, resulting in low power consumption and strong noise immunity . It can be widely used in various PLC real-time communication applications such as smart streetlights, smart homes , central air conditioning, and ubiquitous power IoT terminal devices .

3121N-H Series – Wideband PLC Module Based on HiSilicon Hi3121S

The 3121N-H is developed based on the HiSilicon Hi3121S, operating in the 0.5-3.7MHz and 2.5-5.7MHz frequency bands, and its protocol is based on a subset of the IEEE 1901.1 standard. One CCO can connect 200 STAs and supports dynamic routing and automatic multi-path addressing for rapid network setup.

Oufexin's PLC module products can be widely used in various PLC instant communication application scenarios such as smart street lights, smart homes , smart parking, central air conditioning, photovoltaic communication, and ubiquitous power Internet of Things terminal equipment. Based on the Hisilicon and Lianxintong dual-chip platforms, the company has formed a complete PLC module product matrix ranging from narrowband to broadband and from hundreds to thousands of nodes.

In conclusion

The rise of PLC-IoT is not a replacement for wireless solutions, but a structural supplement to the communication infrastructure of smart homes . Behind walls where wireless signals cannot penetrate, in commercial spaces requiring large-scale stable networking, and in existing buildings where rewiring is not feasible, PLCs are becoming that "invisible but indispensable" connection base.

For every participant in the smart home and IoT module industry, the question that needs to be answered now is not "Will PLC become mainstream?", but "When PLC-IoT becomes the default communication method for smart homes, is your product ready? "

Shenzhen Qogrisys Technology Co., Ltd. specializes in PLC technology. Based on mainstream chip platforms such as HiSilicon Hi3121S and Leadcore VC6330/VC6322TF, it has launched a complete series of PLC module products, including the 3121N-H and S130N-ISI. Learn more about PLC modules and solutions.