BLIIOT BL192Pro: All-in-One Edge I/O Module for Wastewater Monitoring & Automation

In a typical wastewater plant, sensors such as level meters, flow meters, DO meters, pH meters, and COD analyzers come in various brands and output signals – 4-20 mA, RS485, Ethernet. The result is:

• Data is scattered across different systems, requiring three or four interfaces to get a complete picture.
• Traditional solutions require a PLC + I/O expansion + protocol gateway, leading to high procurement costs and complex wiring.
• Most of the time, manual inspection and recording are still used. When the level exceeds the limit or DO drops, operators may not know immediately.

The BL192Pro  is designed to solve these problems. It packs acquisition, logic control, protocol conversion, and cloud upload into a single module, covering the entire process with one device.

One Module, Three Data Paths

The BL192Pro wastewater monitoring & automation edge I/O module covers all wastewater monitoring needs through four core channels:

• RS485 (Modbus RTU master): Connects multiple intelligent instruments (flow meters, DO, pH, COD, etc.) on a single bus; data is mapped to internal registers.
• Digital I/O (expansion modules): Options like Y11 (8 DI), Y22 (8 DO), Y51 (2 PT100, etc.) – acquire pump/grille status and output start/stop commands.
• Analog I/O (expansion modules): e.g., Y31 (4 AI, 4-20 mA/0-10 V) for legacy instrument signals; Y41 (4 AO) for adjusting variable frequency drives.
• Dual Ethernet ports: ETH0/ETH1 support switch cascading, simultaneously providing MQTT (direct to cloud platform), Modbus TCP (to SCADA), and OPC UA (to MES/ERP).

Industrial design: -40 to 85°C wide temperature, 2 kV isolation, ESD/EFT/Surge level 3 protection, built-in hardware watchdog – ensures reliable 24/7 operation in wastewater environments.

RS485 + Modbus RTU: Acquire Multiple Instruments on One Bus

Most intelligent instruments in wastewater plants support Modbus RTU. The isolated RS485 port of the BL192Pro supports baud rates from 2400 to 230400 bps, with up to 247 slave devices on a single bus.

Typical acquisition targets:

In the web configuration interface, add a Modbus master device, enter the slave address, register start address, and number of registers – the system automatically assigns a mapping address (e.g., REG40001). Up to 25 acquisition commands can be created, with adjustable polling intervals.

I/O Expansion Modules: Acquire Device Status & Local Actuator Control

The BL192Pro supports up to three Y series expansion modules, allowing free combinations of DI, DO, AI, AO, and RTD.

• Y11 (8×DI, NPN): Acquires pump running status, grinder overload alarm, valve position feedback. Modbus addresses 2000–2007.
• Y22 (8×DO, NPN): Controls wastewater pumps, grinder machines, agitators start/stop. Addresses 1000–1007. Supports poweroff state retention.
• Y51 (2×RTD, PT100): Measures motor bearing temperature, transformer temperature.
• Y31 (4×AI): Acquires 4-20 mA/0-10 V signals from legacy instruments, 16-bit precision, ±0.1% FSR.

Three Uplink Protocols: MQTT + Modbus TCP + OPC UA

The BL192Pro natively provides three protocol services, delivering the same set of data to different platforms simultaneously:

• Modbus TCP slave: Connects to on-site SCADA (WinCC, KingView, etc.) – the central control room can read all real-time data.
• OPC UA server: Provides standardized data to upper-level MES and ERP systems, enabling integrated production and operation.
• MQTT client: Directly connects to Alibaba Cloud,  AWS IoT, ThingsBoard, or a private broker. Supports JSON format, periodic reporting + change-based reporting, and automatic caching/retransmission when the network is interrupted.

Operators can remotely view plant-wide data and receive alarm pushes via mobile phone or web dashboard.

Edge Logic Control: Automatic Response Without an Upper Computer

The BL192Pro has a built-in web server that supports arithmetic, logic, and conditional operations.

• Scenario 1 – Automatic pump start/stop based on inlet level

Requirement: When the sump level rises to a certain point, automatically start an additional pump; when the level falls back, automatically stop pumps to avoid dry running or overflow.

Implementation: Acquire ultrasonic level meter data via RS485 → REG40000. In the "Conditional Operation" section:
REG40000 > 3.0 m → close DO1 (start pump 1)
REG40000 > 4.5 m → close DO2 (start pump 2)
REG40000 < 2.0 m → open DO1/DO2 (stop pumps)

Effect: Pumps run automatically according to the incoming flow load, requiring no manual intervention and extending equipment life.

• Scenario 2 – Automatic aeration blower adjustment when DO is too low

Requirement: If DO in the aerobic tank falls below 1.5 mg/L, increase aeration; if above 2.5 mg/L, reduce aeration. Otherwise, microbial activity suffers and energy is wasted.

Implementation: Acquire DO analyzer data via RS485 → REG40002. In the "Logic Operation" section:
REG40002 < 1.5 (for 60 seconds) → close DO3 (speedup signal to VFD)
REG40002 > 2.5 → close DO4 (speeddown signal)
DO returns to 1.8–2.2 → stop DO3/DO4, maintain frequency

Effect: Response time is shortened from "hours" (manual detection + adjustment) to "seconds", ensuring compliance while saving electricity.

• Scenario 3 – Automatic grinder start when level difference across grille exceeds threshold

Requirement: If a blocked grille causes a level difference >150 mm, automatic cleaning should start to prevent capacity loss.

Implementation: Measure upstream level REG40010 and downstream level REG40011 using two level meters, calculate difference.
Difference > 150 mm → close DO5 (start grinder for one cycle, then autostop)
If difference remains > 300 mm and does not drop for 2 minutes → DO6 triggers local audible/visual alarm to alert manual intervention.

Effect: The grinder runs only when cleaning is needed, avoiding the mechanical wear of scheduled operation and eliminating overflow risk.

The BL192Pro features the BLRAT remote access tool. Enable it in the web interface, enter the Device Key obtained from the BLRMS platform, and engineers can perform firmware upgrades, parameter configuration, and fault diagnosis remotely – without travelling to the site.

Combined with edge logic automatic control, most daily tasks can be handled locally. Operators only need to monitor cloud platform alarms – truly achieving "attended operation with remote maintenance".

Why Choose the BL192Pro Wastewater Monitoring & Automation Edge I/O Module?

Three-in-one device: Acquisition + logic + protocol conversion – replaces the trio of PLC + expansion + gateway.

• RS485 + Modbus: Connect multiple instruments on a single bus, up to 25 acquisition commands.
• Flexible expansion: 1–3 Y series modules, freely combine DI/DO/AI/AO/RTD.
• Dual Ethernet ports with cascade: Built-in switch – ETH0 connects to the upstream network, ETH1 cascades to the next device, simplifying cabling.
• Industrialgrade robust: -40°C to 85°C wide temperature, 2 kV isolation, watchdog, EMC level 3 certified.
• Edge autonomy: Even if the upper computer or network fails, local logic still controls the devices.
• Remote operation and maintenance: BLRAT enables firmware upgrades and remote parameter configuration.

In wastewater plant automation upgrades, the BL192Pro is not just another I/O module – it is a "versatile hub" connecting sensors, actuators, the central control room, and the cloud platform. It uses RS485 to string together instruments, I/O boards to control equipment, edge logic to respond automatically, and MQTT/Modbus TCP/OPC UA to break down data silos, moving traditional wastewater plants towards reliable, intelligent, attended operation.