DP840 Incremental Pulse Counter Module

Features

• Number of Channels: 8
• Application Compatibility: Single or redundant applications
• Transducer Signal Levels: NAMUR, 12 V, and 24 V interfaces
• Measurement Modes: Each channel configurable for pulse count or frequency measurement
• Advanced Diagnostics: On-board diagnostics for enhanced functionality

Description

The DP840 is an incremental pulse counter module featuring 8 channels, suitable for both single and redundant applications. It supports NAMUR, 12 V, and 24 V transducer signal levels, offering versatile compatibility. Each channel can be configured for either pulse count or frequency measurement, with advanced on-board diagnostics for enhanced reliability.

Technical Specifications

• Power Supply Voltage: 24 V d.c. (19.2 to 30 V d.c.)
• Max Non-destructive Voltage on Inputs: 30 V d.c.
• Maximum Field Cable Length: 200 m
• Cable Type: Twisted pair

Frequency and Pulse Width

• Frequency Range:
  • 10 μs input filter: 0.5 Hz - 20 kHz
  • 100 μs input filter: 0.5 Hz - 5 kHz
  • 800 μs input filter: 0.5 Hz - 625 Hz
  • 6400 μs input filter: 0.5 Hz - 78 Hz
• Minimum Pulse Width: Varies with input filter time

Input Thresholds

• NAMUR:
  • Open wire: 0 mA ≤ IIN < 0.1 mA
  • Contact open: 0.1 mA < IIN < 1.6 mA
  • Contact closed: 1.6 mA < IIN < 6.0 mA
• 12 V / 24 V:
  • With external resistor for cable supervision
    • Contact open: 0 V ≤ VIN < 5.0 V (12 V)
    • Contact closed: VIN > 5.0 V (12 V)
    • Contact open: 0 ≤ VIN < 8.3 V (24 V)
    • Contact closed: VIN > 8.3 V (24 V)

Sensor Supply and Current Consumption

• Sensor Supply Voltage:
  • NAMUR: 8.2 V ±10%
  • 12 V range: 12 V ±10%
  • 24 V range: VL+ - (3.0 ±1.0) V
• Sensor Supply Current: 38 mA ±10%

Measurement Accuracy and Current Consumption

• Max Measurement Error: Relative error and oscillator error included.
• Min Sampling Interval: Dependent on maximum expected input frequency.
• Current Consumption:
  • 5 V (Modulebus): 115 mA
  • 24 V (Process Power Supply): Varies based on sensor current and application.

Other Specifications

• Power Dissipation: 4 W
• Process Voltage Supervision: 1 channel
• MTU Compatibility:
  • Single Applications: TU810, TU812, TU814, TU818, TU830, TU833
  • Redundant Applications: TU842/TU843, TU844/TU845, or TU852/TU854

Dimensions

• Width: 45 mm (1.77”)
• Depth: 102 mm (4.01”), 111 mm (4.37”) including connector
• Height: 119 mm (4.7”)
• Weight: 0.15 kg (0.33 lbs)