TRICONEX 2201 safety-grade digital input (DI) module
The TRICONEX 2201 is a safety-grade digital input (DI) module developed by Triconex (a brand under Rockwell Automation), specifically designed for Triconex Triple Modular Redundancy (TMR) safety control systems. It focuses on collecting low-voltage digital signals or dry contact signals from on-site safety devices (such as emergency stop buttons, limit switches, and fire detectors), converting them into stable digital data recognizable by safety controllers. As a front-end core component of Safety Instrumented Systems (SIS), it ensures accurate and real-time acquisition of critical safety signals in high-risk industries, providing a reliable data foundation for safety interlock logic execution. Below is its detailed information:
TMR Redundancy & SIL 3 Safety Compliance
- Adopts Triconex’s classic Triple Modular Redundancy (TMR) architecture. Three independent signal acquisition channels process the same on-site input signal in parallel, and verify signal validity through a 2-out-of-3 (2oo3) voting mechanism. This design automatically shields single-channel faults (e.g., circuit short circuits, electromagnetic interference-induced errors), avoiding false triggers or missed responses of safety interlocks caused by signal inaccuracies.
- Fully meets international safety standards: TÜV-certified SIL 3 (Safety Integrity Level 3), compliant with IEC 61508 (general safety standard) and IEC 61511 (process industry safety standard). It is suitable for critical safety input loops, such as emergency shutdown (ESD) signal collection and fire & gas (F&G) alarm signal acquisition.
Dual Signal Type Compatibility
- Supports two common industrial digital input formats, eliminating the need for additional signal conversion hardware and adapting to most on-site safety devices:
- Dry contact input: Compatible with normally open (NO) or normally closed (NC) dry contacts, used to connect devices like emergency stop buttons, signal butterfly valves, and limit switches. It detects the "on/off" state of contacts to reflect the working status of devices.
- Low-voltage DC signal input: Optimized for 24V DC (the most common industrial low-voltage standard), suitable for voltage-type sensors such as photoelectric switches and proximity switches. It identifies signal states through voltage presence (e.g., 18–30V DC = "active", 0–5V DC = "inactive").
- Each input channel supports independent software configuration (e.g., contact type, voltage threshold), flexibly matching the signal characteristics of different on-site devices.
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