How are Invensys Triconex 3502E points grouped?

The 32 input points are commoned in four groups of eight.

What input range is recommended for Invensys Triconex 3502E?

The manufacturer table lists 35-95 VAC/VDC with a 95 VAC/VDC maximum.

How does Invensys Triconex 3502E process input data?

Three independent channels condition and scan the points, and the Main Processors vote the resulting input tables.

Which indicators are present on Invensys Triconex 3502E?

Each point has an On/Off indicator and the module has PASS, FAULT and ACTIVE indicators.

Can Invensys Triconex 3502E be maintained as a hot spare?

The official guide states that Tricon digital-input modules include the hot-spare feature for controlled online replacement.

Which slot keys belong to Invensys Triconex 3502E?

The official slot-key table lists top key 004 and bottom key 005.

Which Invensys Triconex 3502E points require periodic toggling?

The guide lists normally Off points for field-point toggling every 24 months under the approved maintenance procedure.

3502E

Name: 3502E
Brand: Invensys
SKU: 3502E

48 VAC/VDC TMR Digital Input Module

Product image is representative; revision or series may vary. Contact us to request a specific version.

Product Describe：

Invensys Triconex 3502E is a 32-point, 48 VAC/VDC TMR digital-input module with a circuit stuck-On self-test. Its input points are commoned in groups of eight and monitored by point and module-status indicators.

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Technical specifications for 3502E

Manufacturer:

Invensys
Product Category:

DCS Systems
Spare Part Number:

3502E
Estimated shipping dimensions:

20.3x12.7x5.1cm
Weight:

0.5 kg
Tariff Code:

8537101190
Counliy of origin:

USA
Module type:

TMR digital input with circuit stuck-On self-test
Nominal input:

48 VAC/VDC
Input points:

32, commoned in groups of 8
Input frequency:

DC or 47-63 Hz
Recommended input range:

35-95 VAC/VDC
Maximum voltage:

95 VAC/VDC
Off-to-On level:

27 VAC/VDC typical; 32 VAC/VDC worst-case
On-to-Off level:

14 VAC/VDC typical; 11 VAC/VDC worst-case
Nominal turn-on current:

6-9 mA
Input impedance:

> 2.9 kOhm nominal
Input delay:

Off-to-On < 8 ms; On-to-Off < 15 ms
Point isolation:

1,000 VAC minimum; 1,500 VDC minimum
Logic power:

< 10 W
Status indication:

One indicator per point; PASS, FAULT and ACTIVE module indicators
Slot keys:

Top 004; bottom 005
Maintenance toggle:

Normally Off points: every 24 months, under approved procedure

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Information

Overview Manuals Common Applications Product Precautions

The Invensys Triconex 3502E monitors discrete field states across three independent input channels before the Main Processors vote the resulting data. Its documented diagnostics, hot-spare support and mechanical keying are intended for controlled Tricon v9-v11 service.

32 points commoned in groups of eight
48 VAC/VDC nominal TMR input architecture
Continuous circuit stuck-On self-test
PASS, FAULT, ACTIVE and per-point indicators

Each channel independently conditions and scans every 3502E input point, then sends its table to the corresponding Main Processor. The Main Processors vote the input data before the application uses it.

The module requires a matched external termination panel and interface cabling. Mechanical slot keying uses top key 004 and bottom key 005, and the official guide lists field-point toggling for normally Off points at the documented maintenance interval.

Important Notice: Confirm the complete 3502E identity, slot keys, ETP, interface cables, field-voltage range and approved maintenance record before installation or replacement.

Invensys Triconex 3502E Manuals & Downloads

Invensys Triconex 3502E Technical Reference (PDF)Invensys Triconex 3502E Installation & Commissioning Guide (PDF)

These two documents are different: the first consolidates exact-model electrical, diagnostic and slot-key data; the second provides controlled installation, commissioning, testing and acceptance checks.

Emergency shutdown inputsAcquire approved 48 VAC/VDC discrete trip contacts in a fault-tolerant Tricon safety architecture.

Burner-management permissivesMonitor documented field switches that participate in approved burner safety logic.

Fire-and-gas discrete signalsBring approved alarm and trip contacts into a voted Tricon input path.

Critical machinery protectionMonitor documented discrete protective states where TMR input integrity is required.

For Invensys Triconex 3502E, verify exact identity, slot keying, field-voltage limits, ETP compatibility and maintenance records before work.

1Record the complete 3502E identity, chassis and logical slot.

2Apply the approved safe-work procedure and isolate field energy.

3Verify top key 004 and bottom key 005 before insertion.

4Confirm the ETP, both interface cables and group commoning.

5Check every field point against the 35-95 VAC/VDC input range.

6Account for the documented diagnostic-glitch behavior in parallel circuits.

7Verify point indicators plus PASS, FAULT and ACTIVE status.

8Complete the approved functional test and maintenance record before release.

Technical notes

The self-test checks the ability to detect the transition of a normally energized circuit to the Off state. The official guide warns that a diagnostic glitch can appear on an adjacent de-energized point, so parallel equipment inputs and commissioning tests must account for the documented behavior.

FAQ View All FAQ

What is Invensys Triconex 3502E?

It is a 32-point, 48 VAC/VDC TMR digital-input module with a circuit stuck-On self-test.
How are Invensys Triconex 3502E points grouped?

The 32 input points are commoned in four groups of eight.
What input range is recommended for Invensys Triconex 3502E?

The manufacturer table lists 35-95 VAC/VDC with a 95 VAC/VDC maximum.
How does Invensys Triconex 3502E process input data?

Three independent channels condition and scan the points, and the Main Processors vote the resulting input tables.

Which indicators are present on Invensys Triconex 3502E?

Each point has an On/Off indicator and the module has PASS, FAULT and ACTIVE indicators.
Can Invensys Triconex 3502E be maintained as a hot spare?

The official guide states that Tricon digital-input modules include the hot-spare feature for controlled online replacement.
Which slot keys belong to Invensys Triconex 3502E?

The official slot-key table lists top key 004 and bottom key 005.
Which Invensys Triconex 3502E points require periodic toggling?

The guide lists normally Off points for field-point toggling every 24 months under the approved maintenance procedure.

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