Product Details
Configured for pulse frequency counting and accumulation tasks in ABB 800xA distributed control networks, the ABB DP840 3BSE028926R1 (DP840 Pulse Counter Module) provides direct physical/electrical execution across 8 isolated field input channels.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | DP840 (3BSE028926R1) |
| Brand | ABB |
| Origin | Sweden |
| Weight | 0.15 kg |
| Dimensions | 45 mm x 102 mm x 119 mm |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | 4 W maximum power dissipation |
| Channels | 8 pulse counting channels |
| Nominal Voltage | 24 VDC (19.2 to 32 VDC range) |
| Modulebus +5 V Current | 115 mA |
| External 24 V Current | 97 mA + external load |
| Isolation | Groupwise isolated from ground (50 V rated insulation, 500 VAC dielectric test) |
| Maximum Field Cable | 200 meters |
| Accuracy Error | Max absolute error 500 ppm at PRIT = 10 ms (oscillator drift 120 ppm + 5 ppm/year) |
| Compatibility | S800 I/O MTUs: TU810, TU812, TU814, TU818, TU830, TU833, TU842, TU843, TU844, TU845, TU852, TU854 |
Backplane Bus Communication Velocity and I/O Density Scaling
The DP840 module interface maintains deterministic Modulebus communication velocity, allowing high-density pulse train processing without degrading backplane scanning cycles. Integrated hardware counters offload high-frequency pulse calculation from the primary AC 800M controller CPU, enabling scalable I/O density scaling across redundant S800 I/O clusters. Firmware flash compatibility ensures consistent channel supervision and process voltage diagnostic reporting through standard ABB 800xA control software libraries.
Frequently Asked Questions
Q: Does the DP840 module support redundant configuration in S800 I/O racks?
A: Yes, the DP840 supports hardware redundancy when paired with redundant Module Terminal Units such as the TU842, TU843, TU844, or TU845.
Q: What is the maximum permitted field cable distance for pulse inputs on this card?
A: The maximum field cable length for input pulse wiring is limited to 200 meters.
Q: How does the internal power distribution behave when supplying power to field sensors?
A: The DP840 provides built-in current-limited sensor power outputs on each input channel to prevent localized short circuits from affecting the backplane logic power supply.
Field Installation Guidelines
- Confirm the mechanical keying code CF matches the designated slot position on the Module Terminal Unit (MTU) before insertion.
- Disconnect Modulebus power and process voltage feeds prior to inserting or removing the DP840 module from the MTU baseplate.
- Align the module housing with the locking guide rails of the MTU and press firmly until the locking mechanism clicks into position.
- Ensure signal wiring cable shields are grounded at the field cable termination bar using low-impedance grounding clamps.
- Verify process voltage levels (19.2 to 32 VDC) on external terminals before energizing the module.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.
Essential Best Practices for PLC Wiring and Installation in Industrial Automation
Successful control system deployment begins with thoroughly reviewing manufacturer technical documentation. Controllers from major brands like Allen-Bradley, Siemens, and Schneider Electric feature unique terminal layouts. Engineers must verify voltage requirements before connecting power cables to prevent catastrophic equipment damage. Standard line connections require strict adherence to regional electrical codes and proper wire color coding. Furthermore, panel builders should always establish a robust low-impedance ground connection using at least 16-AWG copper conductor tied directly to the main plant grounding grid.