WhatsApp:+86 18150087953 WeChat: +86 18150087953 
Email：
Application Scenarios
In a large chemical plant’s DCS upgrade, the existing ABB Advant OCS needs to integrate new motor control centers (MCCs) that communicate via Profibus-DP, while legacy PLCs still use Modbus RTU. The ABB SNAZ-7120J is installed in a remote I/O rack as the communication head module. It acts as a dual master, simultaneously polling data from the Profibus MCCs and the Modbus PLCs, consolidating the information onto the ABB Module Bus for the main controller. This setup resolves the pain point of protocol incompatibility, eliminating the need for costly additional gateways and reducing system complexity, thereby ensuring smooth data flow and control command execution across mixed-vendor equipment.
Parameter
| Parameter | Value / Specification |
|---|---|
| Manufacturer / Brand | ABB |
| Product Model | SNAZ-7120J (Corrected from SNAT7120J) |
| Product Type | Communication Interface Module / Fieldbus Gateway |
| Primary Function | Multi-Protocol Master (Profibus-DP, Modbus RTU, CANopen) |
| Compatible Systems | ABB AC800M, Advant OCS, MOD 300, Symphony Plus |
| Communication Protocols | Profibus-DP (Master), Modbus RTU, CANopen, RS-485 |
| Physical Interfaces | RS-485, CAN, Ethernet (varies by variant) |
| Power Supply | 24 VDC (via backplane or external terminal) |
| Operating Temperature | -20°C to +70°C (industrial standard) |
| Storage Temperature | -40°C to +85°C |
| Dimensions (Approx.) | ~120mm x 100mm x 30mm |
| Installation | DIN Rail or Direct Panel Mount (within control rack) |
| Key Features | Multi-protocol gateway, high noise immunity, modular design |
Technical Principles and Innovative Values
- Innovation Point 1: Multi-Protocol Master Gateway. The SNAZ-7120J‘s standout innovation is its ability to integrate multiple industrial fieldbus protocols (Profibus-DP, Modbus RTU, CANopen) on a single board. This architecture allows a single control node to actively manage and synchronize data from different network ecosystems without requiring external protocol converters, reducing latency, cabinet space, and system cost.
- Innovation Point 2: Deterministic Data Routing. The board is designed for real-time performance. It handles the token-passing mechanism of Profibus and the master-slave polling of Modbus concurrently, ensuring that critical process data from both networks is time-sliced and made available to the host controller (e.g., AC800M or Advant Controller) with minimal delay, which is vital for closed-loop control applications.
- Innovation Point 3: Flexible Role Configuration. Beyond communication, certain variants of the SNAZ-7120J serve as high-density digital I/O or signal conditioning boards. Their design often includes configurable input filters and output drivers, allowing them to interface directly with a wide range of field devices (sensors, actuators) in harsh environments, providing signal isolation and noise rejection to ensure data integrity.
