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Help CenterTRICONEX 3721 Redundant (TMR) Digital Input Module
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TRICONEX 3721 is an industrial-grade high-performance Triple Modular Redundancy (TMR) digital input module, serving as a core component of TRICONEX Safety Instrumented System (SIS). Its core function is to collect discrete digital signals from industrial sites, realize safe and reliable transmission and processing of signals through a triple modular redundancy architecture, and provide accurate on-site status input for the safety instrumented system. Compliant with IEC 61508 standard and Safety Integrity Level 3 (SIL 3) certification, it features electromagnetic interference resistance and high stability design, and is a core input unit for safety control loops in critical industries such as petrochemical and power.
Operating Voltage 24VDC (±10%), supporting redundant power inputInput Channels 16 independent digital input channels with electrical isolation between channelsInput Type Dry contact/wet contact selectable, supporting sourcing input or sinking inputInput Voltage Range 18VDC-32VDC (valid input), 0VDC-5VDC (invalid input)Input Current Typical input current per channel 6mA-10mAResponse Time Channel input response time ≤1msIsolation Level Isolation voltage between channels 500VAC (1 minute), isolation voltage between module and backplane 1500VAC (1 minute)Protection Functions Built-in overvoltage protection, reverse polarity protection, short circuit protectionCertification Standards Compliant with CE, UL, cUL, IEC 61508, ISA S84.01 standards
Mechanical ParametersOverall Dimensions 160mm×100mm×30mm, standard rack-mounted design suitable for TRICONEX system cabinetsWeight Approximately 0.4kg, lightweight facilitating module insertion, removal and maintenanceMounting Method Rail-mounted installation, compatible with TRICONEX standard system rack slotsHousing Material Industrial-grade high-strength flame-retardant plastic shell with electromagnetic shielding performanceConnection Method Plug-in spring terminals, compatible with 0.5-1.5mm² shielded cablesProtection Rating IP20, suitable for indoor industrial control cabinet environmentsStatus Indication Each channel is equipped with an input status LED indicator, and module-level power, operation, and fault LED indicators
Environmental ParametersOperating Temperature -40℃ to 70℃, no performance derating over the entire temperature rangeStorage Temperature -55℃ to 85℃, meeting extreme storage and transportation requirementsRelative Humidity 5% to 95% (non-condensing), adapting to high-humidity industrial scenariosVibration Resistance Complies with IEC 60068-2-6 standard, 2g acceleration at 5Hz-500Hz frequency rangeShock Resistance Complies with IEC 60068-2-27 standard, 15g acceleration (11ms duration)EMC Compliance Complies with EN 55014-1, IEC 61000-4 series standards, low electromagnetic interference and high anti-interference capability
Reliable redundant design with triple modular redundancy architecture, no single point of failure in signal acquisitionStable input accuracy with high channel response consistency, signal acquisition error ≤0.1%Strong anti-interference capability with electromagnetic shielding and channel isolation design, adapting to complex industrial electromagnetic environmentsFlexible expansion capability, supporting parallel expansion of multiple modules, up to 256 digital inputs can be expandedComprehensive self-diagnostic capability, real-time monitoring of channel status, module hardware and power supply conditions, with precise fault locationExcellent compatibility, perfectly matching TRICONEX Tricon and Trident series safety instrumented systemsHigh maintenance convenience, modular plug-in design + clear status indication, simplifying fault troubleshooting and module replacementHigh operational stability, industrial-grade component selection and strict quality control, Mean Time Between Failures (MTBF) ≥1,500,000 hours
Application AreasPetrochemical Industry
Power Industry (Thermal Power, Nuclear Power, New Energy)
Metallurgical Industry
Pharmaceutical Industry
Water Treatment Industry
Natural Gas Transmission and Storage
Chemical Park Safety Control
Mining Industry
Rail Transit Signal System
Marine Industry Safety Control
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