Four common groups
Thirty-two points are arranged as four groups of eight, with each group using its assigned common field path.
TRICONEXSafety and critical control systems
TRICON V9–V11 · 24 VDC Low-Threshold TMR Digital Input Module
THIRTY-TWO-POINT DIGITAL INPUT MODULE
Triconex 3505E 24 VDC Low-Threshold TMR Digital Input Module
Low-threshold sensing with channel diagnostics and group commoning
SECTION 01
Product Information
The Triconex 3505E is a 32-point, low-threshold TMR digital input module for Tricon v9–v11 systems. It receives 24 VDC field states, converts each point into triplicated controller data and groups the field commons in four banks of eight inputs.
For each channel, the 3505E uses an off-to-on threshold around 10 VDC and an on-to-off threshold around 5 VDC, creating hysteresis between the two states. Input delays below 8 ms for energizing and below 15 ms for de-energizing keep field transitions separate from brief electrical changes at the terminals.
Diagnostics in the 3505E exercise input circuitry on a defined toggle cycle and report individual point state plus module Pass, Fault and Active conditions. An energized point is tested every 100 ms, while a point held continuously off must be manually toggled within the stated 24-month interval to preserve diagnostic coverage.
SECTION 02
Technical Data
| Technical Item | 3505E |
|---|---|
| Brand | Triconex |
| Product Type | Low-Threshold TMR Digital Input Module |
| Number of Input Points | 32 |
| Commoning | Groups of 8 |
| Recommended Input Range | 20–42.5 VDC |
| Maximum Voltage | 42.5 VDC |
| Off-to-On Level | 10 VDC typical; 12 VDC worst case |
| On-to-Off Level | 5 VDC typical; 4 VDC worst case |
| Typical Hysteresis | 2 VDC |
| Nominal Turn-On Current | 3–5 mA |
| Input Delay, Off to On | Less than 8 ms |
| Input Delay, On to Off | Less than 15 ms |
| Point Isolation | 1000 VAC minimum; 1500 VDC minimum |
| Point Indicators | One On/Off indicator per point |
| Module Indicators | Pass, Fault, Active |
| Logic Power | Less than 10 W |
| Input Impedance | Greater than 1.25 kΩ nominal |
| Nominal Field Power Load | 0.5 W per On point |
| Maximum-Voltage Field Load | 1.5 W per On point |
| Leakage Current to Chassis | 0.25 mA maximum per On point at 60 Hz |
| Automatic Toggle Rate, On State | Every 100 ms |
| Manual Toggle Interval, Off State | Every 24 months |
SECTION 03
Low-Threshold Input Processing
The 3505E translates low-current 24 VDC field states into the three-channel data used by the TMR controller.
State thresholds
Separate turn-on and turn-off levels provide hysteresis so a channel does not change state at one identical voltage boundary.
Triplicated data path
Each input is conditioned for the three module legs before the controller voting path receives the channel state.
SECTION 04
Self-Test and Channel Diagnostics
The 3505E combines automatic testing of energized inputs with a manual toggle requirement for points that remain off for long periods.
Energized-point cycle
An input in the On state is toggled by diagnostics every 100 ms to expose normally detectable circuitry faults.
Long-off verification
A point continuously held Off needs a manual state change within 24 months to complete the specified diagnostic coverage.
Status separation
One indicator shows each point state, while PASS, FAULT and ACTIVE LEDs describe the module-level condition.
SECTION 05
Product Questions
How are the inputs grouped on Triconex 3505E?
The 32 inputs are commoned in groups of eight. Four field groups therefore make up the complete module. Each eight-point bank uses its assigned common, so a terminal plan should identify the group as well as the point number.
What input range is recommended for Triconex 3505E?
The recommended field range is 20 to 42.5 VDC. The maximum listed input voltage is 42.5 VDC. Design values should remain within the recommended range rather than using the absolute maximum as the normal operating target.
Why does Triconex 3505E use different on and off thresholds?
The separate thresholds create hysteresis between energizing and de-energizing. This prevents one boundary from controlling both transitions. The typical 2 VDC hysteresis further separates the two switching directions.
How quickly does Triconex 3505E respond to an input change?
The off-to-on delay is less than 8 ms and the on-to-off delay is less than 15 ms. These values apply to the input transition path, not the complete controller scan. Controller scan and application response add their own timing beyond these module-level input delays.
How does Triconex 3505E test an input that stays energized?
The diagnostic cycle toggles an On point every 100 ms. That cycle supports detection of the faults covered by the module diagnostics. The automatic test is tied to the energized input condition and should not be described as a field-device functional test.
What happens when a Triconex 3505E point remains off for a long time?
A continuously Off point needs a manual toggle within 24 months for the stated diagnostic coverage. The requirement applies to the point state, not to replacement of the module. A maintenance record should identify points that remain Off continuously so the manual interval is not overlooked.
SECTION 06
About Moore Automation
MOORE AUTOMATION
https://www.mvme.cn/Moore Automation supplies industrial automation and control products through a model-specific enquiry process. Manufacturer, complete catalog number and quantity stay attached to each 3505E request through quotation, order processing and shipment communication.
Original productsGlobal supplyFast delivery1-year warranty
www.mvme.cn
SECTION 07
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Sales Enquiries
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