Overview
Configured for 24 VDC discrete signal acquisition in Tricon safety instrumented systems, the Triconex DI3301S2 (DI3301S2 TMR Digital Input Module) provides direct physical and electrical execution for field input monitoring.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | DI3301S2 |
| Brand | Triconex |
| Product Type | TMR Digital Input Modules |
| System Compatibility | Tricon Safety Instrumented System |
| Origin | USA |
| Weight | Approx. 1.42 kg |
| Dimensions | Not specified in available documentation |
| Operating Temp | -40 deg C to +70 deg C |
| Power Consumption | Approx. 0.2 W per point at 24 VDC |
| Input Channels | 32 digital input channels |
| Input Type | Digital / Discrete Input |
| Nominal Input Voltage | 24 VDC |
| Operating Voltage Range | 15 – 30 VDC |
| Maximum Input Voltage | 33 VDC |
| Input Current | Approx. 6 mA |
| Input Impedance | Approx. 4 kOhm |
| Input Delay Time | Less than 10 ms |
| Isolation Voltage | Up to 1500 VAC channel to logic |
| Architecture | Triple Modular Redundancy (TMR) |
| Diagnostics | Channel monitoring, fault detection, input validation |
| Mounting Type | Tricon rack plug-in module |
TMR Safety Architecture and Signal Isolation
The DI3301S2 implements triple modular redundancy (TMR) 2oo3 architecture for digital signal processing. Moreover, three independent input channels acquire field states separately and transmit validated data through the Tricon controller backplane.
The module applies channel diagnostics and fault comparison functions to identify input path abnormalities. In addition, the design supports galvanic isolation between field circuits and internal logic processing sections to reduce the influence of electrical disturbances.
The DI3301S2 supports fail-safe state execution by maintaining defined input processing behavior during single-channel faults. Therefore, the controller can continue safety logic evaluation while diagnostic functions report channel conditions.
Frequently Asked Questions
Q: What field signals can the DI3301S2 process?
A: The DI3301S2 processes digital discrete input signals, including 24 VDC wet contacts and dry contact inputs connected through compatible field termination assemblies.
Q: How does the module handle input channel failures?
A: The module uses TMR processing with independent input channels and diagnostic comparison functions to detect channel-level faults.
Q: Does the DI3301S2 support online replacement?
A: The module supports hot-spare replacement functions in compatible Tricon configurations. Replacement procedures must follow the installed system maintenance requirements.
Field Installation Guidelines
Install the DI3301S2 in the designated Tricon rack slot and verify correct mechanical seating before system operation.
Use approved field termination assemblies and maintain proper separation between signal wiring and high-voltage power conductors. Furthermore, connect cable shields according to the site grounding standard to reduce electrical interference.
Verify input polarity, field voltage levels, and contact wiring before applying power. Perform channel diagnostics after installation to confirm correct signal acquisition and fault reporting.
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