ABB 3BDH000741R1 CTI 21-PEX Product Specification
1. Product Overview
The ABB 3BDH000741R1 CTI 21-PEX is a high-reliability communication interface module designed for ABB’s AC 800M and AC 800XA distributed control systems (DCS). Serving as a critical connectivity bridge in industrial automation, it enables seamless data exchange between DCS controllers, peripheral devices, and upper-level monitoring systems. Widely deployed in power generation, petrochemical, and water treatment industries, this module ensures stable and real-time transmission of process control signals, supporting efficient operation and safety management of industrial facilities.
Compliant with international standards including IEC 61131-2 and UL 508, the CTI 21-PEX features redundant communication paths, robust anti-interference design, and wide environmental adaptability. It maintains consistent performance in harsh industrial conditions with electromagnetic noise, temperature fluctuations, and vibration, meeting the stringent reliability requirements of critical process control systems.
2. Technical Parameters & Specifications
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Category
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Details
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Product Model
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ABB 3BDH000741R1 CTI 21-PEX
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Product Type
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Industrial Ethernet Communication Interface Module
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Compatible Systems
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ABB AC 800M DCS, AC 800XA DCS
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Communication Protocols
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PROFINET IO; Modbus TCP/IP; Ethernet/IP; ABB Control Network (ACN)
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Communication Ports
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2×Gigabit Ethernet (Redundant); 1×RS-485 (Backup)
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Data Transfer Rate
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1 Gbps (Ethernet); 115.2 kbps (RS-485)
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Latency
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≤1 ms (Deterministic Communication)
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Isolation
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Port-to-Port: 1500 V DC; Port-to-System: 1500 V DC
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Power Supply
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24 V DC ±15% (Redundant Input); Power Consumption: ≤18 W
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Environmental Ratings
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Operating Temp: -10°C–60°C; Humidity: 5%–95% (Non-Condensing); Vibration: ≤2 g
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Certifications
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IEC 61131-2; UL 508; CE; ATEX Zone 2; RoHS
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3. Key Features
3.1 Redundant & Reliable Connectivity
Equipped with dual redundant Gigabit Ethernet ports and a backup RS-485 interface, the module eliminates single points of failure in communication links. Automatic failover (≤50 ms) ensures uninterrupted data transmission, which is critical for safety-related applications such as power plant boiler control and petrochemical emergency shutdown systems.
3.2 Multi-Protocol Compatibility
Support for PROFINET IO, Modbus TCP/IP, Ethernet/IP, and ABB’s proprietary ACN enables seamless integration with ABB DCS and third-party automation devices (e.g., Siemens PLCs, Emerson transmitters). This multi-protocol capability simplifies system expansion and retrofitting in mixed-brand industrial environments, reducing integration costs and time.
3.3 Deterministic Low-Latency Transmission
With a 1 Gbps data transfer rate and latency ≤1 ms, the module ensures real-time transmission of process control signals. The deterministic communication mechanism guarantees consistent data delays, avoiding unpredictable responses in time-sensitive applications like batch processing in pharmaceutical facilities and high-speed packaging lines.
3.4 Robust Industrial Design
The module operates reliably over a wide temperature range (-10°C–60°C) and features IP40-rated housing, making it suitable for both control room and field-mounted applications. Enhanced electromagnetic compatibility (EMC) performance (compliant with IEC 61000-4) resists interference from industrial electrical noise, ensuring stable operation in refineries and heavy manufacturing plants.
4. Related ABB Products
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ABB 3BDH000742R1 CTI 22-PEX: Advanced communication module with additional PROFINET RT/IRT support, suitable for high-performance motion control systems.
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ABB AC 800M Controller: Core controller of ABB DCS, fully integrating CTI 21-PEX for external communication and data exchange.
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ABB AI810 Analog Input Module: 8-channel analog input module, transmitting process data to AC 800M via CTI 21-PEX.
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ABB AO810 Analog Output Module: 8-channel analog output module, receiving control commands from AC 800M through CTI 21-PEX.
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ABB PanelView 800 HMI: Industrial human-machine interface, communicating with AC 800M via CTI 21-PEX for centralized operation and monitoring.
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