Description
The Triconex 3501E is a 32-point Triple Modular Redundant (TMR) Digital Input Module for Tricon safety instrumented systems. It is designed for monitoring discrete field signals from switches, relays, alarms, and other on/off devices in applications where input integrity and fault tolerance are important.
The module accepts 115 VAC/VDC nominal field signals, with a recommended operating range of 90–155 VAC/VDC. All 32 inputs are non-commoned and individually opto-isolated, allowing the module to handle field signals with strong electrical isolation.
🔧 Key Features
• 32 independent digital input points
• TMR architecture for high-integrity safety applications
• 115 VAC/VDC nominal input
• 90–155 VAC/VDC recommended input range
• Non-commoned, individually isolated inputs
• Opto-isolated field interface
• Input status indication for every channel
• PASS / FAULT / ACTIVE module diagnostics
• Fast input response
• Suitable for AC or DC discrete field signals
• Red color-coded Tricon digital input module
📋 Technical Datasheet
🔹 Brand: Triconex
🔹 Model: 3501E
🔹 Series: Tricon Safety System
🔹 Product Type: TMR Digital Input Module
🔹 Number of Inputs: 32 points
🔹 Input Configuration: Non-commoned, isolated
🔹 Nominal Input Voltage: 115 VAC/VDC
🔹 Recommended Input Range: 90–155 VAC/VDC
🔹 Maximum Input Voltage: 155 VAC/VDC
🔹 Frequency Range: DC or 47–63 Hz
🔹 OFF → ON Switching: 69 VAC/VDC typical; 86 VAC/VDC worst case
🔹 ON → OFF Switching: 36 VAC/VDC typical; 28 VAC/VDC worst case
🔹 Nominal Turn-On Current: 6–9 mA
🔹 Input Impedance: >8.5 kΩ nominal
🔹 OFF → ON Delay: <8 ms
🔹 ON → OFF Delay: <15 ms
🔹 Point Isolation: 1,000 VAC minimum / 1,500 VDC minimum
🔹 Logic Power: <10 W
🔹 Field Power: 1.5 W per active input
🔹 Input Indicators: Individual LED per point
🔹 Module Indicators: PASS / FAULT / ACTIVE
🔹 Color Code: Red
🛡️ TMR Architecture
The 3501E uses the Tricon TMR architecture, where the input information is processed through three independent channels. The resulting input data is voted before being used by the main processors. This architecture is intended to maintain reliable operation while providing fault detection and tolerance for safety-related control systems.
🔌 Application
The 3501E is well suited for monitoring:
• Emergency shutdown signals
• Limit switches
• Pressure and level switch contacts
• Motor and pump status
• Valve position feedback
• Relay contacts
• Alarm and trip signals
• Other 115 VAC/VDC discrete field devices
⚠️ Installation Notes
Confirm the field voltage before installation. The 3501E is a 115 VAC/VDC input module and should not be substituted directly with 24 VDC models such as the 3503E or 3505E.
The module also uses an external termination arrangement and should be installed in the appropriate Tricon chassis and configured for the existing Tricon system architecture.
❓ FAQ
Q: How many channels does the 3501E have?
A: It provides 32 digital input points.
Q: What voltage does the 3501E accept?
A: Its nominal field voltage is 115 VAC/VDC, with a recommended range of 90–155 VAC/VDC.
Q: Is the 3501E a TMR module?
A: Yes. It is a Triple Modular Redundant digital input module.
Q: Are the inputs individually isolated?
A: Yes. The 32 inputs are non-commoned and opto-isolated.
Q: Can it accept both AC and DC signals?
A: Yes. The specified input frequency range is DC or 47–63 Hz.
Q: What are the diagnostic indicators?
A: Each input has an individual status indicator, while the module provides PASS, FAULT, and ACTIVE indicators.
Q: Is 3501E the same as 3501T?
A: No. Both are 115 VAC/VDC, 32-point TMR input modules, but the 3501T provides a higher specified point-isolation rating.
⭐ 10 Other Triconex Models
- Triconex 3502E — 48 VAC/VDC Digital Input Module
- Triconex 3503E — 24 VAC/VDC Digital Input Module
- Triconex 3504E — 64-Point Digital Input Module
- Triconex 3505E — 24 VDC Low-Threshold Digital Input Module
- Triconex 3501T — 115 VAC/VDC TMR Digital Input Module
- Triconex 3604E — Digital Input Module
- Triconex 3601E — Digital Input Module
- Triconex 3624 — Digital Input Module
- Triconex 3805E — Analog Output Module
- Triconex 3503E — 32-Point TMR Digital Input Module
