ABB 3BDH000741R1 CTI21-P Ex Intrinsically‑Safe Terminal Interface Module

Description

Hardware and Performance Specifications Auxiliary supply: Powered via CEX‑bus, typical 200 mA @24 V DC Signal types: Intrinsically‑safe 4‑20 mA analog signals, binary digital signals for Ex‑field transmitters and sensors Bus interface: CEX optical bus for communication with S800 I/O modules Mounting mode: DIN‑rail mounting unit Protection class: IP20 Operating temperature: +5 ℃ ~ +55 ℃ Storage temperature: ‑40 ℃ ~ +70 ℃ Humidity: 5‑95 %RH non‑condensing Environment compliance: ISA 71.04 G3 corrosion‑resistant standard Certifications: ATEX intrinsic‑safety certification, CE, DNV‑GL marine certification Dimension & weight: approx. 225 × 120 × 60 mm, weight approx. 0.75 kg

Main Functions Realize intrinsically‑safe signal marshalling wiring for field instruments in hazardous areas. Provide reinforced electrical isolation between explosion‑risk‑field side and safe‑area control‑system side, satisfy Ex‑ia/ib intrinsic‑safety requirements. Process 4‑20 mA analog and binary digital signals from field sensors and transmitters. Transmit field‑site signal data to S800 I/O modules through CEX optical bus. Pluggable terminal blocks for convenient field wiring, module replacement without rewiring field cables. Front‑panel LED indicators for bus‑link status and module fault indication. Hardware self‑diagnosis detects bus‑communication failure and internal circuit faults, and reports fault status to AC 800xA control system. Parameter configuration and diagnosis are completed by ABB Control Builder engineering software.

Installation Requirement DIN‑rail installation inside safe‑area control cabinet. Strictly separate hazardous‑area intrinsically‑safe cables and non‑intrinsically‑safe power‑cable wiring according to Ex‑installation specifications. Ensure reliable cabinet protective grounding. After unit replacement, confirm full part‑number 3BDH000741R1 matches original project configuration, download complete system configuration file. Perform CEX‑optical‑bus communication test and signal‑loop verification. This Ex‑interface unit cannot be substituted by ordinary non‑Ex terminal modules. Do not put into service until no hardware self‑diagnosis fault alarm exists.

Typical Application Scenarios Intrinsically‑safe terminal‑interface spare‑part for ABB AC 800xA S800 I/O system, used for signal marshalling in petrochemical, oil‑gas, chemical‑plant hazardous‑area automation‑control‑system maintenance and spare‑part replacement.

Key Features

1. Dedicated intrinsically‑safe terminal‑interface unit for S800 I/O system, meets ATEX intrinsic‑safety standards for explosive‑hazardous‑area applications.
2. Adopt CEX optical‑bus communication, effectively suppress strong‑electromagnetic‑field interference in industrial‑site environment.
3. Pluggable terminal‑block design, reduce field‑rewiring workload during module replacement.
4. G3‑grade anti‑corrosion hardware design, adapt to harsh chemical‑plant site environment.
5. Strict full‑part‑number matching must be followed during spare‑part replacement; ordinary non‑Ex modules cannot replace CTI21‑P Ex.