Description
ABB DSDX451 Digital expansion unit
Introduction to ABB DSDX451 5716075-K Digital Expansion Unit
ABB DSDX451 5716075-K is a remote digital I/O expansion unit in the ABB Advant OCS/Advant Master distributed control system, designed for industrial automation scenarios that require adding digital input/output channels in remote areas away from the main control cabinet. This module does not have independent communication capabilities and must be connected to basic units (such as DSDP140B, DSDP160, etc.) in order to work, with communication and scheduling managed by the basic units.
ABB DSDX451 Digital expansion unit
core positioning
The core function of this module is to expand the digital I/O capacity of the system, connect on-site sensors (switch signals) and actuators (solenoid valves, relays, indicator lights, etc.) to the control system, and support remote distributed deployment, reducing long-distance wiring from the site to the main control cabinet, lowering wiring costs, and improving system maintainability.
Basic Parameters
Material Number: 5716075-K
Model: DSDX451
Digital input channel: 20 channels, 24V DC, input current per channel ≤ 6mA
Digital output channels: 12 channels, relay output (dry contact), 0.1A-3A per channel
Power supply: 240/220/120V AC, 47-63 Hz, 50 VA
Built in fuse: 500 mA (material number 56722011-11)
Communication method: Communication is only conducted through the connected basic units, without independent bus interfaces
Monitoring method: Unified monitoring by basic units
Working temperature: -20 ° C to+60 ° C
Storage temperature: -40 ° C to+85 ° C
Relative humidity: 5% to 95% (non condensing)
Protection level: IP20, suitable for installation inside control cabinets
physical properties
Dimensions: Height 180mm x Width 94.5mm x Depth 216mm
Weight: Approximately 2.9kg
Installation method: Standard DIN rail installation
Connector types: 2-pin plug (2664193-2), 4-pin plug (2664197-4), 8-pin plug (2664193-8)
Main functional features
Channel expansion capability: The combination of 20 DI channels and 12 DO channels provides a high channel density among similar expansion units, making it suitable for scenarios where a large number of switch signals need to be collected simultaneously and multiple actuators need to be driven.
Relay output characteristics: All 12 outputs are relay dry contacts, supporting AC and DC loads, especially suitable for driving inductive loads such as solenoid valves, contactor coils, indicator lights, alarms, etc. This is the key difference from transistor output modules.
Loop monitoring: supports the detection of anomalies such as input open circuits and output short circuits. Fault information is reported by the basic unit to the main controller, and diagnostic data can be viewed through system software for quick identification of the fault channel.
Status indicator: Equipped with running indicator lights, channel status indicator lights, and power indicator lights, it can quickly determine the working status of the module on site without the need for additional diagnostic tools.
Multiple protection: Built in 500mA fuse protection, with power reverse connection protection and overload protection, reducing the risk of damage caused by wiring errors or abnormal working conditions.
Electromagnetic isolation: There is electrical isolation between the input/output channel and the system bus, effectively suppressing the impact of on-site electromagnetic interference on the control system.
Hot swappable support: supports online hot swappable replacement, module maintenance can be completed without cutting off system power, reducing downtime risk.
Parameterized configuration: Supports online configuration of I/O parameters through ABB’s dedicated industrial control software, with real-time configuration taking effect and reducing downtime for debugging.
Comparison with products in the same series
DSDI451 is a 32 channel pure digital input expansion unit without output channels, suitable for scenarios where only an increase in DI points is required. DSDX451L is a low signal level output variant, with an output type of low level relay, suitable for occasions with special requirements for output signal levels. The core positioning of DSDX451 is a comprehensive digital expansion unit that combines DI and DO. The channel ratio of 20 DI+12 DO is suitable for most industrial scenarios that require simultaneous acquisition and driving. DSDP140B/DSDP160 are the basic units and controllers of remote I/O stations, and DSDX451 must be attached to these basic units to work. The three work together to form a complete remote I/O station.
Typical application scenarios
Power industry: Remote switch quantity acquisition and driving of auxiliary equipment for generator sets, such as start stop control of feedwater pumps and fans.
Chemical industry: signal acquisition of reactor valve switch, safety interlock drive, reducing wiring length from site to control room.
Metallurgical industry: remote I/O distributed deployment of equipment such as continuous casting machines and rolling mills.
Water treatment: monitoring and control of pump station valve status, driving of dosing system actuators.
Manufacturing industry: production line equipment status monitoring, conveyor line sorting control.
