Product Overview
The ABB DP840 is an 8-channel pulse counter module engineered for high-speed counting and frequency measurement in demanding industrial environments. With each channel capable of handling up to 20 kHz signals, the DP840 delivers precise data acquisition for process control and monitoring applications. Its flexible design supports NAMUR, 12 V, and 24 V transducer signal levels, making it a versatile choice for both single and redundant system architectures.
Built on the S800 I/O platform, the DP840 integrates seamlessly with ABB's Module Termination Units (MTUs) such as TU810V1, TU812V1, TU814V1, TU830V1, and TU833. This module performs cyclic self-diagnostics and offers advanced on-board diagnostics, ensuring reliable operation and simplified troubleshooting.
Key Features & Benefits
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8 independent channels for pulse counting or frequency measurement
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Frequency range: 0.5 Hz to 20 kHz
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Interface support: NAMUR, 12 V, and 24 V transducer signals
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Redundancy capable for high-availability applications
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Configurable input filters on each channel
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16-bit counter for pulse accumulation
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Advanced diagnostics including process voltage supervision and loop supervision
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Groupwise isolation from ground for noise immunity
Technical Specifications
| Parameter |
Value |
| Article Number |
3BSE028926R1 |
| Type |
Pulse counter |
| Number of Channels |
8 |
| Signal Specification |
24 V d.c. (19.2 - 32 V d.c.) |
| Frequency Measurement |
0.5 Hz - 20 kHz |
| Max Field Cable Length |
200 meters (218 yards) |
| Power Dissipation |
4 W |
| Current Consumption (+5 V Modulebus) |
115 mA |
| Current Consumption (+24 V external) |
NAMUR = 56 + 0.5 x external load [mA], 12 V = 89 + 0.7 x external load [mA], 24 V = 97 + external load [mA] |
| Isolation |
Groupwise isolated from ground |
| Rated Insulation Voltage |
50 V |
| Dielectric Test Voltage |
500 V a.c. |
| Operating Temperature |
0 to +55 °C (+32 to +131 °F) |
| Storage Temperature |
-40 to +70 °C (-40 to +158 °F) |
| Protection Class |
IP20 (IEC 60529) |
| Dimensions (W x H x D) |
45 mm x 119 mm x 102 mm (1.77” x 4.7” x 4.01”) |
| Weight |
0.15 kg (0.33 lbs) |
Industry Applications
The ABB DP840 excels in applications requiring precise speed or position monitoring, such as conveyor belt speed control, motor RPM measurement, and flow totalization. Its ability to read inputs as digital signals also makes it suitable for simple on/off sensing in discrete manufacturing lines.
In redundant configurations, the DP840 ensures uninterrupted operation in critical processes like power generation and chemical processing, where downtime is not an option. The advanced diagnostics help maintenance teams quickly identify channel faults, reducing mean time to repair.
Installation & Setup Guidance
Mount the DP840 onto a compatible S800 MTU (TU810V1, TU812V1, TU814V1, TU830V1, or TU833). Ensure proper keying (code CF) to prevent incorrect insertion. Connect field wiring to the MTU terminals, observing the signal type (NAMUR, 12 V, or 24 V) and polarity. Configure each channel via the control system for pulse count or frequency mode, and set the input filter as needed. After power-up, verify the front LEDs indicate normal operation (Run and Primary if in redundant mode).
Maintenance & Reliability
The DP840 requires minimal maintenance, but regular inspection of field wiring and connectors is recommended to prevent loose connections. The module's built-in self-diagnostics run continuously, alerting operators to any channel errors via front LEDs and status signals. Operating within the specified temperature range and avoiding high humidity environments will extend the module's service life. The corrosion protection (ISA-S71.04: G3) ensures durability in harsh industrial atmospheres.
Compatibility & Integration
The DP840 is part of the ABB S800 I/O system and works with a wide range of MTUs, including TU810, TU812, TU814, TU818, TU830, TU833, TU842, TU843, TU844, TU845, TU852, and TU854. It is compatible with ABB's 800xA and Symphony Plus control systems, providing seamless integration into existing automation architectures.
Selection Guide & Purchasing Advice
Before purchasing the ABB DP840, verify your system's compatibility with the S800 platform and confirm the required MTU model. Check the signal types you need to interface with (NAMUR, 12 V, or 24 V) to ensure the module meets your application. For redundant systems, order two modules and ensure your MTU supports redundancy. When you are ready to buy, PLC Source PRO offers genuine ABB DP840 modules with fast shipping and competitive pricing.