ICS Triplex T3401 DC Digital Input Module

Input Configuration and Signal Processing

T3401 provides 16 DC digital input circuits, divided into two groups of eight. Each group supports isolated field signal connections. The module detects changes in external switch states and transfers the corresponding input status through the Regent I/O Safetybus.

The input operating range is 14-30 VDC. The minimum turn-on threshold is 12 VDC, while the maximum turn-off threshold is 4.7 VDC. Therefore, these thresholds define the voltage levels used to distinguish ON and OFF input states.

Electrical Characteristics and Isolation

Each input draws 8.7 mA. The specified turn-on delay ranges from 0.2 to 1.8 ms, while the turn-off delay ranges from 0.5 to 2.6 ms. These response times describe how quickly the module registers changes in field input signals.

In addition, optical isolation separates field circuits from the internal logic, with a minimum isolation rating of 2500 V. The module also specifies continuous overvoltage withstand of 50 VAC and burst overvoltage withstand of 80 VAC for 5 s.

Technical Specifications

Operating Environment and Power Loading

T3401 has a specified heat dissipation of 10 W and a Safetybus power loading of 1.15 load units. These values are relevant when checking the power budget and thermal conditions of the Regent system.

Meanwhile, the operating temperature range is 0 to 60 deg C, with a storage range of -40 to 85 deg C. The specified operating humidity is 0-95% without condensation.

Model Selection Notes

T3401 uses a 14-30 VDC input operating range. T3402 and T3408 have different input voltage limits. Therefore, maintenance teams should check the required field voltage and the exact module model before selecting a replacement. Similar housing or appearance does not establish electrical interchangeability.

Frequently Asked Questions

Q: How many digital input channels does the ICS Triplex T3401 provide?

A: T3401 provides 16 DC digital input circuits, arranged in two isolated groups of eight.

Q: What DC input voltage does the T3401 support?

A: Its specified input operating range is 14-30 VDC. The turn-on threshold is 12 VDC minimum, and the turn-off threshold is 4.7 VDC maximum.

Q: Can T3401 replace T3402 or T3408 directly?

A: Do not assume direct interchangeability. These models have different input voltage limits, so check the field signal voltage and system configuration before replacement.