TriconEX 3721 is a high-density three-mode redundancy (TMR) analog input module used in conjunction with the TRICON safety instrument system SIS, which is used to collect on-site analog signals for safety-critical process control, emergency shutdown ESD and fire and gas F&G) systems. Three redundant voting structures eliminate single points of failure and continuously and stably collect signals under bad working conditions.
The module integrates 32 DC-coupled differential analog input channels, receives the voltage signal of the field transmitter, and is externally connected with a 250Ω resistor to support 4-20mA loop measurement. TriStation software can be used to switch between 12-bit/14-bit sampling accuracy, 10ms high-speed signal refresh, and collect process parameters such as pressure, temperature, flow, and liquid level in real time. It conforms to IEC 61508 SIL3 safety level and is widely used in oil and gas, petrochemical, electric power, and chemical industries.
Core characteristics
1. TMR three-mode redundant architecture, fault-tolerant design, and no single point of failure. 2. 32 differential DC-coupled analog input channels 3. Signal: 0–5VDC/5VDC; External 250Ω resistor supports 4-20mA. 4. 12-bit standard /14-bit high-precision resolution can be configured by software. 5. The 10ms input is refreshed, and the safety interlock response is fast. 6. The measurement accuracy is better than 0.15% of full scale. 7. IEC 61508 SIL3 certification 8. Adaptable to Tricon v10.2 and above SIS systems.
Model
3617E
3623/T
3624
3625/A
3664/3674
3636R
3700
3700A
3701
3703E
3704E
3706A
3708E
3720
3721
3805E/H
3806
3807
4119
User name Member Level QuantitySpecificationPurchase Date
Triconex 97717400195-210 3000656-210 An external termination panel (ETP) is an electrically-passive printed circuit board (PCB) towhich field wiring is easily attached. A panel connector, terminal blocks, and optionalcomponents are mounted to the PCB and enclosed in a DIN-rail compatible plastic housing.