•• Core Function: Provides 32 channels of 24V DC digital input signal conditioning with Triple Modular Redundant (TMR) architecture for safety applications.
•• Key Specs: 32 channels, 24V DC input, TMR design, high reliability.
DSDP140A: Product OverviewThe DSDP140A is a 32-channel digital input module designed for ABB’s Triconex Safety Instrumented System (SIS) platform. This high-density module serves as the interface between field-mounted digital devices and the triple modular redundant (TMR) safety controller in critical process applications. Installed in a Triconex chassis, its function is to monitor the status of discrete field devices such as emergency stop buttons, pressure switches, level switches, valve position limit switches, and other safety-critical contacts. The module converts these field contact status signals into digital values for processing by the TMR system’s main processors.The module incorporates three independent input circuits per channel that are constantly compared by the main processor to detect any discrepancies. This TMR architecture ensures that no single point of failure can compromise the safety function, making the module suitable for Safety Integrity Level (SIL) 3 applications as defined by international standards IEC 61508 and IEC 61511. The design focuses on providing high reliability and diagnostic coverage for critical process safety applications where failure could result in hazardous conditions.
ABB DSDP140B
DSDP140A: Technical Specifications
•• Model Number: DSDP140A
•• Manufacturer: ABB (Triconex)
•• Product Type: 32-Channel Digital Input Module
•• Input Channels: 32 channels
•• Input Voltage: 24V DC nominal (typically 19-30V DC operating range)
•• Input Type: Sinking or sourcing configurable per channel
•• Architecture: Triple Modular Redundant (TMR)
•• Response Time: Typically < 10ms per channel
•• Isolation: Channel-to-channel and channel-to-system isolation
•• Power Supply: 5VDC from Triconex backplane
•• Power Consumption: Typically 3W
•• Operating Temperature: 0°C to 60°C (32°F to 140°F)
•• Safety Certification: SIL 3 capable (IEC 61508)
•• Connection: Via front-mounted removable terminal block
ABB DSDP140B
Core Features & Customer ValueThe Triple Modular Redundant architecture provides the highest level of safety and availability for critical process applications. Each channel contains three independent input circuits that are voted on by the main processor. This design allows the system to continue operation even if one circuit fails, while immediately alerting operators to the need for maintenance. For safety engineers, this means achieving the required Safety Integrity Level (SIL 3) for the most demanding applications while maintaining process availability.The module’s comprehensive diagnostic capabilities include continuous monitoring of circuit health, open wire detection, and short-circuit detection. These diagnostics provide early warning of potential failures, allowing for planned maintenance rather than emergency shutdowns. The high channel density (32 channels per module) optimizes cabinet space while maintaining complete channel-to-channel isolation, preventing fault propagation between channels.Hot-swappable capability allows for module replacement without system shutdown, significantly reducing maintenance downtime. The module’s robust design ensures reliable operation in harsh industrial environments, with built-in protection against power surges and electrical noise. The front-accessible terminal blocks facilitate easy wiring and maintenance without requiring removal of the module from the chassis.Typical ApplicationsIn refinery and petrochemical applications, the DSDP140A is used in Emergency Shutdown Systems (ESD) to monitor critical safety devices such as emergency stop buttons, high-pressure switches, flame detection sensors, and gas detection sensors. The TMR architecture ensures that safety functions remain operational even with a component failure.In turbine control systems, this module monitors overspeed detection sensors, vibration switches, and lubrication system pressure switches. The high reliability and diagnostic capabilities support the continuous operation requirements of these critical applications while maintaining the necessary safety integrity.
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Full 12-month warranty on all components
Full 12-month warranty on all components
