DP840 Product Introduction

When precise pulse counting and frequency measurement are critical, the DP840 from ABB delivers reliable performance. This module features 8 identical independent channels, each capable of pulse count or frequency (speed) measurement up to 20 kHz. The inputs can also be read as digital input signals, adding flexibility. With a configurable input filter and advanced self-diagnostics, the DP840 supports both single and redundant applications. It interfaces with NAMUR, 12 V, and 24 V transducer signal levels, making it a versatile choice for industrial automation systems.

Key Features & Technical Specs

• 8 independent channels for pulse count or frequency measurement.
• Maximum frequency measurement of 20 kHz.
• Configurable input filter on each channel.
• Advanced on-board diagnostics for process supervision.
• Groupwise isolated from ground for signal integrity.
• Built-in current limited sensor power supply.
• Maximum field cable length of 200 meters.
• Power dissipation of 4 W.

Unique Insight: The DP840 offers a maximum absolute error of only 500 ppm (0.05%) at 10 ms PRIT, ensuring high accuracy in critical counting and speed applications.

Applications & Use Cases

In manufacturing environments, the DP840 excels at monitoring conveyor belt speeds or counting products on a production line. Its ability to read inputs as digital signals also makes it suitable for simple on/off sensing. For redundant applications, the module’s advanced diagnostics provide continuous supervision, reducing unplanned downtime. The DP840 is commonly used in oil and gas, chemical processing, and other heavy industries where reliability is paramount.

Installation & Setup

Mount the DP840 module in an S800 I/O system using compatible Module Termination Units such as TU810V1, TU812V1, TU814V1, TU830V1, or TU833. Ensure the operating temperature stays within 0 to +55 °C, and for vertical mounting in compact MTUs, do not exceed 40 °C. Connect field wiring up to 200 meters using cable rated for the environment. Use the configurable input filter to reduce noise on long cable runs.

Maintenance & Reliability

The DP840 performs cyclic self-diagnostics, including process voltage and loop supervision. To maintain reliability, inspect the module periodically for dust or debris, especially in harsh environments. The module’s corrosion protection meets ISA-S71.04 G3, making it suitable for corrosive atmospheres. For long service life, store the module between -40 to +70 °C when not in use.

Compatibility & Integration

The DP840 integrates with ABB S800 I/O systems and works with a wide range of Module Termination Units, including TU810, TU812, TU814, TU818, TU830, TU833, TU842, TU843, TU844, TU845, TU852, and TU854. It supports both single and redundant configurations, ensuring seamless integration into existing automation architectures.

FAQ about DP840

Q: What is the maximum frequency the DP840 can measure?

A: The DP840 can measure frequency up to 20 kHz.

Q: How many channels does the DP840 have?

A: The DP840 has 8 independent channels.

Q: Can the DP840 be used in redundant applications?

A: Yes, the DP840 supports redundant configurations.

Q: What is the power dissipation of the DP840?

A: The DP840 dissipates 4 W of power.

Q: What is the maximum field cable length for the DP840?

A: The maximum field cable length is 200 meters.

Q: What certifications does the DP840 have?

A: The DP840 carries CE, electrical safety (EN 61010-1, UL 61010-1), hazardous location (C1 Div 2, C1 Zone 2, ATEX Zone 2), and marine certifications (BV, DNV, LR).

Product Support & Availability

The DP840 is available from PetroPartsOnline, a trusted supplier of industrial automation and oil/gas parts. Contact our team for current stock levels and lead times. We offer fast shipping and expert support to help you integrate this module into your system.