3BSE028926R1 ABB DP840 Pulse Counter Frequency Measurement Module

The 3BSE028926R1 ABB DP840 is an S800 I/O pulse counting and frequency measurement module with eight independent channels. Each channel can be configured for pulse counting or frequency/speed measurement, making the module suitable for acquiring repetitive pulse signals and monitoring rotational or process-related frequency signals in ABB automation systems.

 

DP840 supports both single and redundant configurations and accepts NAMUR, 12 V and 24 V transducer signal levels. Its frequency measurement range extends from 0.5 Hz to 20 kHz, while pulse counting is performed using a 16-bit counter.

 

 

 

 

Item	Details
Brand	ABB
Product ID	3BSE028926R1
Type Designation	DP840
Product Family	S800 I/O
Module Type	Pulse Counter
Catalog Description	Pulse Counter or Frequency Measurement Module
Number of Channels	8
Configuration	Single or redundant
Signal Specification	24 V DC (19.2–32 V DC)
Frequency Measurement	0.5 Hz–20 kHz
Counter	16-bit
HART	No
SOE	No
Intrinsic Safety	No
High Integrity	No
Mechanics	S800

 

The above identification and core electrical information are based on ABB's current DP840 product selector and datasheet.

 

 

DP840 is designed around eight identical independent channels. Each input can be configured according to the measurement requirement, allowing the same module to handle pulse counting or frequency measurement rather than requiring separate module types for these two functions.

 

For pulse-counting applications, the input pulses are accumulated in a 16-bit counter. When used for frequency or speed measurement, the module covers signals from 0.5 Hz to 20 kHz. This makes DP840 suitable for applications where repetitive pulse signals need to be acquired and converted into usable process or speed information.

 

The inputs can also be read as digital input signals, giving the module an additional operating mode when the incoming signal is used as a discrete status rather than as a counting or frequency value.

 

 

ABB specifies DP840 for NAMUR, 12 V and 24 V transducer signal levels. The general signal specification listed for the module is 24 V DC, 19.2–32 V DC.

 

Each channel also has a configurable input filter. This allows the module to process pulse signals according to the characteristics of the connected field device and measurement application.

 

For procurement, it is therefore important to match the complete module identification rather than selecting a generic pulse counter based only on the nominal input voltage.

 

 

One of the notable characteristics of the ABB DP840 is its support for both single and redundant applications. ABB identifies the module as a redundant-capable S800 I/O pulse-counting module, allowing it to be used in installations where higher availability is required.

 

This distinguishes DP840 from the ABB DP820, which is a two-channel bidirectional pulse counter and frequency measurement module without the same redundancy designation. ABB documentation lists DP820 as 3BSE013228R1, while DP840 is 3BSE028926R1.

 

 

 

ABB specifies the following error characteristics for DP840:

 

Measurement Item	ABB Data
Frequency Measurement Range	0.5 Hz–20 kHz
Maximum Relative Error, PRIT 10 ms	300 ppm
Maximum Relative Error, PRIT 20 ms	150 ppm
Maximum Relative Error, PRIT 50 ms	60 ppm
Maximum Relative Error, PRIT 100 ms	30 ppm
Crystal Oscillator Error	120 ppm + 5 ppm/year
Maximum Absolute Error	500 ppm / 0.05% under stated conditions

 

These accuracy figures are dependent on the measurement conditions specified by ABB, so they should be treated as product specifications rather than as universal accuracy values for every operating condition.

 

 

ABB specifies DP840 for use with a range of S800 I/O Module Termination Units. The current ABB product selector lists:

 

• TU810V1
• TU812V1
• TU814V1
• TU830V1
• TU833
• TU842
• TU843
• TU844
• TU845
• TU852
• TU854

 

Older ABB system catalogs also list the corresponding TU810, TU812, TU814, TU830 and TU833 families for DP840.

 

When replacing an installed DP840, the existing MTU and cabinet arrangement should therefore be checked together with the I/O module identification.

 

 

ABB's S800 I/O product information gives the following physical data for DP840:

 

Parameter	Value
Width	45 mm
Height	119 mm
Depth	102 mm
Depth Including Connector	111 mm
Weight	0.15 kg
Mechanics	S800

 

The compact S800 format allows the module to be integrated into the corresponding S800 I/O termination-unit architecture.

 

 

 

DP840 belongs to the S800 I/O Pulse Counting Modules group. ABB's system catalogs place it alongside the DP820 pulse-counting module. The two products serve different signal-acquisition requirements:

 

Model	ABB Article Number	Main Function
DP820	3BSE013228R1	2-channel bidirectional pulse counter and frequency measurement
DP840	3BSE028926R1	8-channel pulse counter or frequency measurement

 

DP820 supports up to 1.5 MHz according to ABB catalog information, while DP840 is specified for 0.5 Hz–20 kHz and provides eight channels with single or redundant operation.

 

This comparison is useful when identifying an installed ABB pulse-counting module because the two model numbers can otherwise appear similar in procurement searches.

 

 

For maintenance purchasing, the complete identification should be supplied as:

 

ABB 3BSE028926R1 / DP840

 

The article number is especially important because S800 I/O contains multiple pulse-counting and signal-interface modules with different channel counts and electrical characteristics.

 

Before replacing an installed unit, check:

 

• Existing ABB article number
• DP840 type designation
• Number of required pulse channels
• Single or redundant application
• Connected transducer signal type
• Existing Module Termination Unit
• Required frequency measurement range
• Existing cabinet and S800 I/O configuration

 

This approach is more reliable than selecting a replacement solely from the words "pulse counter" or "frequency measurement module."

 

 

Customers may search for this product using either the ABB article number or the DP840 designation. Useful identification phrases include:

 

3BSE028926R1

ABB 3BSE028926R1

DP840

ABB DP840

ABB 3BSE028926R1 DP840

DP840 Pulse Counter

DP840 Frequency Measurement Module

ABB DP840 Pulse Counter

ABB S800 DP840

S800 I/O DP840

DP840 8 Channel Pulse Counter

DP840 20 kHz Pulse Counter

 

 

What is ABB 3BSE028926R1?

3BSE028926R1 is the ABB article number for the DP840 Pulse Counter or Frequency Measurement Module in the S800 I/O family.

 

How many channels does DP840 have?

DP840 provides 8 independent channels. Each channel can be configured for pulse counting or frequency measurement.

 

What frequency range does DP840 support?

ABB specifies a frequency measurement range of 0.5 Hz to 20 kHz.

 

Can DP840 be used in a redundant application?

Yes. ABB specifies DP840 for both single and redundant applications.

 

Does DP840 support digital input reading?

Yes. The module inputs can also be read as digital input signals.

 

Which ABB S800 MTUs can be used with DP840?

ABB lists several compatible Module Termination Units, including TU810V1, TU812V1, TU814V1, TU830V1, TU833, TU842, TU843, TU844, TU845, TU852 and TU854.

 

Is DP840 the same as DP820?

No. DP840 is 3BSE028926R1 and provides eight channels with 0.5 Hz–20 kHz frequency measurement. DP820 is 3BSE013228R1, a two-channel bidirectional pulse counter/frequency measurement module with a different signal architecture.

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