MTL 8123-PL-QU Pulse and Quadrature Input Module

Overview

The MTL 8123-PL-QU is a high-performance 2-channel pulse and quadrature input module for the MTL PAC8000 I/O system. It captures high-speed pulse signals and quadrature encoder inputs from field devices, including flow meters, proximity sensors, and rotary encoders. Additionally, it provides frequency measurement, acceleration detection, and configurable alarms. These features ensure precise monitoring in industrial automation and hazardous areas.

Technical Specifications

• Model Number: MTL 8123-PL-QU

• Channels: 2 pulse input channels or 1 quadrature input

• Frequency Range: 1 Hz to 50 kHz (12.5 kHz in quadrature mode)

• Accuracy: ±0.05% of span @ 25°C

• Temperature Stability: 0.005% per °C

• Sensor Types Supported: NAMUR, current pulse, voltage pulse, switch

• Input Voltage Range: 0–24 VDC (max 50 VDC)

• Input Current Range: Up to 20 mA

• Input Impedance: Voltage: >10 kΩ; Current: 25 Ω; NAMUR: 1 kΩ

• Switching Thresholds: NAMUR: 1.2 mA / 2.1 mA

• Open/Short Circuit Detection: Module detects faults automatically

• Pulse Counting: Count up/down with optional gate control

• Quadrature Mode: Enable or disable direction detection

• Filtering Options: Off, 1, 5, 20, 100 kHz

• Sample Period: Configurable from 20 ms to 200 s

• Alarms: Frequency and acceleration alarms with user-defined limits

• Output Channels: 2 open-collector outputs (max 30 V, 100 mA)

• Retransmission Bandwidth: 1–2000 Hz

• Power Supply: 8.1 VDC nominal @ 8 mA for NAMUR sensors

• Hazardous Area Rating: Supports Zone 0 / Div 1 and Zone 2 / Div 2 installations