Triconex 3721 Analog Input Modules
Overview
Triconex 3721 Analog Input Module is a member of the Triconex Safety Instrumented System (SIS) family and is based on Triple Modular Redundancy (TMR) architecture. It converts variable voltage signals from various field points into digital values and transmits them to the three main processor modules as required.
The module features a mechanical keying design to prevent incorrect insertion and comes with dedicated Tricon cables. It is suitable for safety-critical parameter monitoring applications, such as pressure/temperature safety interlock signals and fire & gas detection systems.
Function&Features：
Triconex 3721
Median selection algorithm: In TMR (Triple Module
- Redundancy) mode, a median selection algorithm is used to select a value from three channel data.
Signal connection requirements:
- It is recommended to use twisted pair shielded cable (AWG18-22)
- Grounding resistance <1Ω (independent grounding)
EMC protection:
- Built-in TVS tube (±30kV ESD protection)
- RFI filter (>60dB attenuation)
：
| Parameter | Details |
| Voltage | 0 to 5 VDC or -5 to +5 VDC1, +6% |
| Type | TMR |
| No. of Input Points | 32 differential, DC - coupled |
| Input Update Rate | 10 ms |
| Resolution | 12 bits or 14 bits programmable |
| Accuracy | < 0.15% of FSR from 0° to 60°C |
| Input Resistance (load) | 10 MΩ(DC), min. |
| Power - Off Resistance | 140 kΩ(DC), typical |
| Common Mode Rejection | -85 dB (DC - 100 Hz) |
| Common Mode Range | -12V to +12V peak |
| Leg - to - Leg Isolation | 420 kΩ typical |
| Frequency Response | -3 dB @ 23 Hz -8 dB @ 60 Hz -14 dB @ 120 Hz |
| Isolation Voltage | 150 VDC/115 VAC continuous |
Note: The 3721 module has passed TÜV functional safety certification and the mean time between failures (MTBF) is 450,000 hours. When configuring, please note that the modules on the same ETP share the power supply circuit. It is recommended to use an isolated transmitter for power supply.
Tricnoex 3721 - Q&a
FAQ
Q: What is the brand?
A: Triconex
Q: What is the type?
A: Analog Input Module
Q: What is the warranty?
A: 1 year
Q: Where is the shipping lovation?
A: Xiamen
Q: What is the payment method?
A: T/T
Q: Why choose us?
A: We are the supplier for industrial automation spare parts,We speciaized in PLC DCS and TSl system modules and spare parts for 10 years, With our professional expertise and extensive experience, we are well-equipped to meet your requirements.
Contact us
Our address
Room 1904, Building B, Diamond Coast, No. 96 Lujiang Road, Siming District, Xiamen, Fujian, China
Phone Number
+86 18059276824
sales7@nseauto.com
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