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The ABB TB521-ETH is a versatile terminal base designed for the AC500 V2 PLC platform, offering a reliable interface for processor and communication modules. It serves as the electrical and mechanical foundation that connects PLC modules with external wiring and industrial networks.

This terminal base integrates Ethernet connectivity and serial communication interfaces, allowing efficient data exchange between PLC controllers, field devices, and supervisory systems. With support for multiple communication modules, the TB521-ETH enables scalable network architectures for complex automation systems.

Engineered for industrial environments, the module features a compact DIN-rail design and robust electrical performance, making it ideal for modern automation panels where reliable networking and flexible communication are essential.

Technical Specifications

Parameter	Specification
Model	TB521-ETH
Product ID	1SAP112100R0270
Manufacturer	ABB
Module Type	Terminal Base
PLC Platform	AC500 V2 PLC System
Processor Slot	1 CPU module
Communication Module Slots	2
Communication Interfaces	RJ45 Ethernet, D-SUB, Terminal connections
Serial Interfaces	2 × RS232 / RS485
Supply Voltage	24 V DC
Degree of Protection	IP20
Mounting Type	DIN-rail mounting
Operating Temperature	0 to +60 °C
Storage Temperature	−40 to +70 °C
Dimensions (L × W × H)	28 × 123.5 × 135 mm
Net Weight	0.186 kg

The TB521-ETH terminal base provides two communication module slots together with Ethernet and serial interfaces, enabling flexible communication options for industrial PLC systems.

Recommended Related Models

Model	Description
TB511-ETH	Terminal base with one communication module slot
TB523-2ETH	Terminal base with dual Ethernet interfaces
TB541-ETH	Terminal base supporting four communication modules
CM579-ETH	Ethernet communication module
PM590-ETH	AC500 PLC CPU module

These related modules are commonly used to build scalable PLC communication infrastructures within ABB automation systems.

Popular ABB Models

Model	Module Type
PM590-ETH	PLC CPU Module
CI840A	Communication Interface Module
AI830A	Analog Input Module
SB822	Redundant Power Supply Module
PP865A	Industrial Operator Panel

These ABB products are widely used across industrial PLC, DCS, and process automation systems.

Applications

The ABB TB521-ETH Terminal Base is widely applied in industrial automation systems that require reliable PLC communication infrastructure:

Factory automation systems
PLC control cabinets
Manufacturing production lines
Energy and power distribution systems
Water treatment plants
Building automation systems
Process control and monitoring networks

Its Ethernet and serial communication interfaces enable efficient integration with modern industrial networks.

Advantages

Multi-Module Communication Support
Two communication module slots allow flexible system expansion.

Integrated Ethernet Connectivity
Built-in Ethernet interface enables high-speed network communication.

Flexible Serial Communication
Dual RS232 / RS485 interfaces allow integration with legacy devices and industrial protocols.

Compact PLC Integration
Space-efficient design simplifies installation inside control cabinets.

Industrial-Grade Reliability
Engineered for stable long-term operation in demanding industrial environments.

Scalable Automation Architecture
Ideal for distributed PLC systems requiring modular communication expansion.

Technical FAQs

1. What is the ABB TB521-ETH used for?
It is a terminal base used to connect processor and communication modules within the AC500 V2 PLC system.

2. How many communication modules can it support?
The TB521-ETH supports two communication modules.

3. What communication interfaces are included?
It includes Ethernet (RJ45) and two serial interfaces (RS232/RS485).

4. What PLC platform is it designed for?
The module is designed specifically for the ABB AC500 V2 PLC system.

5. What is the power supply requirement?
The terminal base operates on 24 V DC power.

6. What are the dimensions of the TB521-ETH?
Its dimensions are 28 × 123.5 × 135 mm.

7. What is the net weight of the module?
The net weight is approximately 0.186 kg.

8. What protection rating does the module have?
It has an IP20 protection rating, suitable for installation inside control cabinets.

9. What temperature range can it operate in?
The module operates between 0 °C and +60 °C.

10. What communication protocols can be used with this module?
When paired with compatible communication modules, it can support industrial protocols such as Modbus TCP and Modbus RTU.

Look forward to your comments!Comment