The 3721 is a high-density, 32-point differential analog input module designed for Triconex Triple Modular Redundant (TMR) safety systems. It provides precision monitoring for 0-5 VDC signals with a rapid 10 ms update rate and programmable 12/14-bit resolution. Built for high-reliability environments, the 3721 features robust electrical isolation and significant overrange protection to ensure continuous signal integrity in safety-critical applications.
Technical Specifications
Input Points: 32 Differential, DC-coupled
Voltage Range: 0 to 5 VDC or -5 to +5 VDC (+6%)
Update Speed: 10 ms cycle
Resolution: 12-bit or 14-bit (Programmable)
Accuracy: < 0.15% of FSR (0° to 60° C)
Noise Rejection: -85 dB Common Mode (DC – 100 Hz)
Continuous Protection: 150 VDC / 115 VAC
Weight: 1.36 Kg (Unit) / 4 Kg (Shipping)
Common FAQ
Is the 3721 compatible with TMR architecture?
Yes, it is specifically designed for Tricon TMR controllers to ensure no single point of failure affects the safety loop.
How does programmable resolution benefit the system?
It allows engineers to balance data precision with processing overhead, selecting 12-bit for standard tasks or 14-bit for high-accuracy requirements.
