定位：SIL3 三重化冗余（TMR）数字量输入模块，用于关键安全回路（ESD/FGS）。

安全等级：SIL 3（IEC 61508），TÜV 认证

二、核心功能

滤波：50/60 Hz 数字滤波，抑制现场干扰。

尺寸 / 重量：300 × 30 × 240 mm / 1.1–1.2 kg.

原厂状态：已正式停产（EOL）

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ICS Triplex T8402 Digital Input Module

Conclusion (as of May 13, 2026):

Lifecycle: End of Life (EOL), belonging to ABB/ICS Triplex Trusted security system old I/O, no longer produced by the original factory, relying solely on inventory/refurbished/second-hand supply.

Positioning: SIL3 Triple Redundancy (TMR) Digital Input Module, used for Critical Safety Circuits (ESD/FGS).

1、 Basic Information

Model: T8402 (ICS Triplex, later acquired by ABB, now part of Honeywell Trusted system)

Series: Trusted ®  TMR Security System I/O Module

Channel: 40 DC digital inputs (divided into 8 groups, each with 5 channels)

Input voltage: 24 VDC (logic level), typical current of 6 mA per channel

Isolation: 2500 V optical isolation between channels and system side

Safety level: SIL 3 (IEC 61508), T Ü V certified

2、 Core functions

Triple Redundancy (TMR): 3-2-0 fault-tolerant architecture, single channel failure does not affect the system.

Hot Swap: Continuous module replacement without production stoppage.

SOE event record: 1 ms timestamp, accurately tracing the sequence of switch actions.

Line diagnosis: Each channel can be configured with disconnection/short circuit detection.

Filtering: 50/60 Hz digital filtering to suppress on-site interference.

3、 Technical parameters

Working temperature: -40 ° C~+70 ° C

Storage temperature: -40 ° C~+85 ° C

Humidity: ≤ 95% (no condensation)

Size/Weight: 300 × 30 × 240 mm/1.1-1.2 kg

4、 Discontinuation and Replacement

Original factory status: Officially discontinued (EOL)

Market inventory:

Brand new original: Very rare, high price, long delivery time.

Refurbished/Used: Adequate supply, 6-12 month warranty, high cost-effectiveness.

Alternative models:

Direct replacement: T8403 (upgraded version of the same series, 40 channels, compatible with functions).

System upgrade: migrate to ABB/Honeywell's next-generation safety system (such as Safety Manager).

5、 Application scenarios

Petrochemical and natural gas ESD/FGS safety systems

Monitoring of key circuits in power and metallurgy

High reliability interlock control for water treatment and pharmaceuticals