TRICONEX 2351 safety-grade digital input (DI) module
The TRICONEX 2351 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 is mainly used to collect dry contact signals or voltage signals from on-site safety devices (such as emergency stop buttons, limit switches, and pressure switches) and convert them into digital signals recognizable by the safety controller. It provides reliable input data for safety interlock logic (e.g., emergency shutdown, equipment isolation) in high-risk industries, and is a core front-end component of Safety Instrumented Systems (SIS). Below is its detailed information:
TMR Redundant Architecture & SIL 3 Safety Compliance
- Adopts the same Triple Modular Redundancy (TMR) design as Triconex safety systems. 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. Even if a single channel fails (e.g., circuit short, signal interference), it can still ensure accurate identification of the on-site device status, avoiding false triggers or missed responses of safety interlocks.
- 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 (e.g., emergency stop signal collection, fire detector signal acquisition).
Multi-Type Digital Input Support
- Compatible with two common industrial digital input signals, adapting to different on-site safety devices without additional signal conversion:
- Dry contact input: Supports normally open (NO) or normally closed (NC) dry contacts, used to connect devices like emergency stop buttons, limit switches, and signal butterfly valves. It detects the "on/off" state of the contact to reflect the device’s working status.
- Voltage signal input: Supports 24V DC (common in industrial scenarios), used to collect voltage-type signals from devices like photoelectric sensors or proximity switches. It identifies the signal state through voltage presence (e.g., 24V DC = "on", 0V DC = "off").
- Each input channel is independently configurable (e.g., setting contact type, voltage threshold), flexibly matching the signal characteristics of on-site devices.
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