3511 | Triconex Pulse Input Module

The Triconex 3511 Pulse Input (PI) Module is specifically designed to provide highly accurate, high-frequency pulse measurements. It is ideal for applications involving non-amplified magnetic speed sensors commonly used on rotating equipment such as turbines and compressors. By detecting voltage transitions from these sensors, the module calculates frequency or RPM with exceptional precision, ensuring reliable data for speed monitoring.

Key Features

Precision Measurement for Rotating Equipment
- Detects voltage transitions and measures pulse counts with a 1 microsecond resolution.
- Generates frequency or RPM data from accumulated pulse counts over a defined time window.
Triple Modular Redundancy (TMR)
- Utilizes three independent channels, each processing input signals separately.
- Main processors vote on the data to ensure high integrity and reliability.
Advanced Diagnostics
- Continuous diagnostics monitor channel health, activating the Fault Indicator and chassis alarm when issues occur.
- Fault detection isolates channel faults without causing module failure.
Hot-Spare Capability
- The module supports hot-spare replacement for enhanced system uptime and reliability.
Optimized for Speed Measurement
- The module is fine-tuned for speed monitoring applications and does not support totalization.

Specifications

Specification	Details
Model Number	3511
Type	TMR
Input Signals	8, non-commoned
Resolution	16 bits
Accuracy	1000 Hz to 20,000 Hz, ±0.01%
Input Characteristics	AC Coupled, Balanced Differential
Update Rate	25 ms (typical)
Impedance (Load)	>8 kΩ (20 kΩ typical)
Common Mode Range	-100 VDC to +100 VDC peak-to-peak
Normal Mode Range	1.5 V to 200 V peak-to-peak
Overrange Protection	±150 VDC (continuous)
Hysteresis	150 millivolts (typical)
Wave Shape	Sine, square, pulse, etc.
Duty Cycle	10% to 90%
Frequency Range	20 Hz to 20,000 Hz
Current Range	0-20 mA (250-ohm shunt)
Diagnostic Indicators	– Input Status: 1 per point
	– Module Status: PASS, FAULT, ACTIVE
Color Code	Light Purple

Applications

Rotating Equipment Monitoring
Designed for turbines, compressors, and other rotary machines, it delivers highly reliable speed data.
High-Frequency Sensing
Ideal for environments requiring accurate frequency measurement within a wide range (20 Hz to 20,000 Hz).
Industrial Safety Systems
The module’s fault-tolerant TMR architecture ensures data integrity, even under fault conditions.

Advantages

Ensures precision with 16-bit resolution and ±0.01% accuracy.
Operates reliably under harsh conditions with robust overrange and voltage protection.
Supports various wave shapes, including sine, square, and pulse signals, making it highly versatile.