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TRICONEX 3505E 32-Point Low-Threshold TMR Digital Input Module

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TRICONEX SAFETY INSTRUMENTED SYSTEM

3505E • TMR Digital Input Module

✦ 24V AC/DC LOW THRESHOLD ✦

❖ PARAMETER 01

Channel Density

32 Input Points: Commoned in groups of 8 channels.

⚡ Features continuous self-test diagnostics for SIL 3 safety integrity.

❖ PARAMETER 02

Voltage Threshold

20 - 42.5 VDC: Nominal 24 VDC low threshold operation.

⚡ Precise switching threshold (ON >12V, OFF <4V) to prevent signal noise.

❖ PARAMETER 03

Response Speed

Fast Delay Time: Input delay <8ms (ON), <15ms (OFF).

⚡ Optimized for rapid fault detection and triple modular voting logic.

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AMIKON · TRICONEX

OVERVIEW SPECS SERIES APPLICATIONS FAQ QUOTE

TRICONEX / I-O

DIGITAL INPUT

TMR ARCHITECTURE

LOW-THRESHOLD

SAFETY I/O MODULE

3505E

32-Point Low-Threshold TMR Digital Input Module

The 3505E is designed for 24 VDC digital input applications where low switching thresholds, triplicated I/O architecture and self-test capability are important to the operating design.

KEY POSITION

24 VDC

Low-threshold input design

32 POINTS

Commoned in groups of 8

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INPUT

24 VDC

POINTS

INPUT RANGE

20–42.5 VDC

ISOLATION

1000 VAC / 1500 VDC

INPUT DELAY

<8 / <15 ms

STATUS

PASS / FAULT / ACTIVE

01 / PRODUCT POSITION

Built around
low-threshold
24 VDC input

The 3505E belongs to the Tricon family of triplicated digital input modules. Its low-threshold input design distinguishes it from the standard 24 VAC/VDC 3503E when the field circuit requires a lower switching threshold.

TMR INPUT STRUCTURE Triplicated signal processing The input circuitry interfaces with the Tricon triplicated I/O architecture, supporting fault-tolerant processing of digital field signals.	LOW THRESHOLD 10 V typical OFF → ON The typical OFF-to-ON switching level is 10 VDC, with 12 VDC specified as the worst-case value.
FIELD CONNECTION Commoned in groups of 8 The 32 input points are arranged as four groups of eight with commoned field connections.	SELF-TEST Diagnostic support The module includes self-test capability intended to support detection of normally detectable I/O faults.

3505E / ELECTRICAL CHARACTERISTICS
Module type	TMR low-threshold digital input module
Number of input points	32, commoned in groups of 8
Recommended input range	20–42.5 VDC
Maximum voltage	42.5 VDC
OFF to ON switching level	10 VDC typical; 12 VDC worst-case
ON to OFF switching level	5 VDC typical; 4 VDC worst-case
Typical hysteresis	2 VDC
Nominal turn-on current	3 mA to 5 mA
Input impedance	> 1.25 kΩ nominal
Input delay	OFF to ON < 8 ms; ON to OFF < 15 ms
Point isolation	Opto-isolated; 1,000 VAC minimum / 1,500 VDC minimum
Point status indication	One indicator per input point
Module status indication	Pass / Fault / Active
Logic power	< 10 W
Nominal field power load	0.5 W per ON point; 1.5 W at maximum field voltage
Leakage current to chassis @ 60 Hz	0.25 mA maximum per ON point
Maximum input toggle rate	Every 100 ms for diagnostic fault coverage

SERIES MAP

Choose the
input architecture
around the field circuit

The 3505E sits within the Tricon 32-point digital input family. Its defining position is the low-threshold 24 VDC configuration.

3501E / 3501T	115 VAC/VDC, 32-point TMR input family; non-commoned configuration.
3502E	48 VAC/VDC, 32-point TMR input, commoned in groups of 8 with self-test.
3503E	24 VAC/VDC, 32-point TMR input, commoned in groups of 8 with self-test.
3504E	24/48 VDC high-density TMR digital input architecture with 64 points.
3505E	24 VDC low-threshold TMR input, 32 points, commoned in groups of 8.

FIELD DECISION POINTS

Where 3505E becomes a practical replacement choice

01 / LOW SIGNAL THRESHOLD When a conventional 24 V input threshold is not the right fit The 3505E uses a lower switching threshold than the 3503E. This makes the 3505E relevant when the field circuit design calls for the low-threshold 24 VDC configuration.	02 / REPLACEMENT CHECK Verify the electrical interface before ordering For replacement work, verify the existing module number, field voltage, commoning arrangement, termination hardware and point count. A physically similar module should not be treated as an electrical substitute without checking these interface conditions.
03 / DIAGNOSTIC MAINTENANCE Useful where input diagnostics matter The 3505E provides point and module status indication and self-test functions. Its diagnostic behavior is designed around the Tricon I/O architecture rather than a basic standalone digital input module.	04 / SAFETY SYSTEM CONTINUITY Designed for Tricon safety I/O environments The module is intended for Tricon TMR I/O architecture. It is therefore most appropriate when maintaining an existing Tricon installation rather than introducing a conventional PLC digital input module.

PURCHASE DESK

Need a 3505E
replacement?

Send the exact part number and system details for a faster quotation.

EMAIL · sales@amikon.cn	WHATSAPP · 86-18020776792
Sales Manager: Miya zheng

Delivery 3–5 days	Warranty 12 months	Packaging Brand New	Delivery way E-packing / FedEx / EMS / TNT / DHL / UPS
Payment term: T/T

Quotation details to prepare

Part Number / Quantity / Destination / Required Date / Machine/System

BUYER CHECKPOINTS

3505E Questions Before Replacement

01	Can TRICONEX 3505E replace a 3503E in an existing 24 V field circuit? Not automatically. Both belong to the 32-point commoned TMR input family, but the 3503E is specified for 24 VAC/VDC, while the 3505E is a 24 VDC low-threshold module. The switching thresholds are also different. Replacement should therefore be checked against the actual field supply and signal characteristics.
02	Why would a buyer specifically choose TRICONEX 3505E instead of another 32-point digital input module? The key distinction is its low-threshold 24 VDC input behavior. The OFF-to-ON switching level is 10 VDC typical, with 12 VDC specified as the worst-case value. This makes the model relevant when the field interface requires a lower threshold than the conventional 24 VAC/VDC 3503E.
03	What should be checked before ordering TRICONEX 3505E for a failed field input module? Confirm the installed model, 24 VDC field supply, 32-point arrangement, commoning in groups of 8, termination hardware and system generation. Also compare the required switching threshold with the existing field circuit. These checks reduce the risk of installing a module with a different electrical interface.
04	Does TRICONEX 3505E provide useful diagnostic coverage for maintenance planning? Yes. The module provides individual point status indication, module status indication for Pass, Fault and Active, and self-test capability. The specified maximum input toggle rate for diagnostic fault coverage is every 100 ms. These characteristics are relevant when maintaining a safety I/O installation where diagnostic behavior matters.
05	What makes TRICONEX 3505E a suitable stocking item for an existing Tricon installation? It combines a specific 24 VDC low-threshold interface with 32-point TMR input architecture. For plants operating this exact module configuration, keeping a correctly matched spare can shorten recovery time after an I/O fault. The replacement decision should still be based on the installed part number and field interface.

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	Restore performance. Reduce maintenance delay. Extend system service life. AMIKON combines sourcing capability, warehouse coordination and international shipping to help maintenance teams obtain industrial automation parts with less procurement friction. EMAIL AMIKON WHATSAPP

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AFTER-SALES

Return / Replacement

Please contact us within 7 days if you have any question after you receiving the items.
Returned items must remain in their original condition and the specific reason for the return should be provided. After the returned items are received, we will arrange a return or replacement for the order when applicable.
The buyer is responsible for the shipping costs incurred for the return.

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TRICONEX 3505E

Match the part number. Confirm the interface. Move the replacement process faster.

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