Product Overview

The ABB 3BDH000311R0101, product-shortened as PL810, is a PROFIBUS PA Power Link Module that forms the field-side bridge inside ABB’s LD 800P Linking Device system — the architectural piece that lets a PROFIBUS DP master (ABB Freelance AC 700F / AC 800F, AC 800xA with a DP master card, or a third-party PLC such as Siemens S7/PCS7) talk to PROFIBUS PA field instruments (smart valves, pressure/flow transmitters, level radar, analyzers) in a process plant, while simultaneously powering the PA segment from the cabinet’s 24 V DC auxiliary. The PL810​ does not sit alone — it always pairs with an ABB Head Station: HS 810​ (1-channel), HS 820​ (2-channel), or HS 840​ (4-channel, with PROFIBUS DP media redundancy). The Head Station carries the DP V1 interface (up to 12 Mbps, RS-485, DB9 / terminal style depending on build) toward the DCS/PLC; the ABB 3BDH000311R0101​ then hangs off the Head Station via a dedicated 31.25 kbit/s terminal pair (Terminals 28+, 29- per the entity parameter) and delivers the PA side — IEC 61158-2 physical layer, fixed 31.25 kbit/s, 24 V DC nominal PA bus voltage, ≤ 400 mA sustained output, up to 32 PROFIBUS PA slave devices per segment.What makes the PL810​ notable in the ABB process-automation catalog is the “collapse-three-boxes-into-one” value: a conventional DP-to-PA setup would need a DP-PA coupler (protocol bridge), a separate PROFIBUS PA bus power supply, and an isolator between DP and PA. The ABB 3BDH000311R0101​ integrates all three — protocol transparency, PA bus power (fed from the same 20–35 V DC input that also powers the module itself, nominal draw ~790 mA before PA load), and triple galvanic isolation (CH/DP, CH/Power, PA/Power, each 50 Veff design) — in one DIN-rail module, 80 × 115 × 107 mm, 320 g, IP20, manufactured by ABB Automation Products GmbH, Mannheim, Germany. Configuration is none — “transparent transmission,” plug-and-play, the PA instruments simply appear on the DP side as GSD-defined slaves. Hazardous-area certification is Zone 2 / II 3 G / Ex nA II T4 (TÜV 02 ATEX 1886 X), making the PL810​ the standard PA-link choice in chemical-plant and refinery instrument loops where the DP backbone lives in the non-classified MCC room and the PA instruments live in the classified pipe-rack / unit area.For instrument engineers running Freelance or 800xA plants with PA smart-valve populations, the ABB 3BDH000311R0101​ is the spare that sits behind the HS Head Station — invisible until a PA segment goes dark because the old Power Link cooked its DC-DC stage, and then the 20-minute swap (unplug removable terminals, slide the new PL810​ onto the DIN, re-seat, no software load) brings the 32 PA devices back online.

Technical Specifications

Main Features and Advantages

DP-to-PA bridge + PA bus power in one DIN module:​ The headline of the ABB 3BDH000311R0101​ is integration. A PROFIBUS PA segment conventionally needs three things: a DP-PA coupler (protocol bridge, often a separate DIN box), a PA bus power supply (24 V DC, current-limited, often a Phoenix or Pepperl+Fuchs unit rail-mounted next to the coupler), and galvanic isolation between the DP (non-classified) and PA (potentially classified / long cable run) sides. The PL810​ collapses all three into one 80 mm width DIN module that hangs off the HS Head Station. The DP side lives on the Head Station (HS 810/820/840, which the plant DCS/PLC talks to at up to 12 Mbps); the ABB 3BDH000311R0101​ takes the PA-side handoff from the Head Station at 31.25 kbit/s over two terminals and drives the PA segment at 24 V DC, ≤ 400 mA, with the 100 Ω terminator already on-board. For an instrument engineer speccing a new PA link or replacing a failed one, that is one spare-line-item instead of three.Transparent transmission, zero configuration:​ The PL810​ is not a gateway that needs a GSD file of its own or a PC-tool download — it is transparent. The GSD belongs to the Head Station (HS 810/820/840) on the DP side; the PA instruments’ GSDs belong to the instruments themselves. The ABB 3BDH000311R0101​ just passes the telegrams and powers the bus. “Plug-and-play” in industrial automation is an overused phrase, but here it genuinely applies: swap a failed PL810, re-seat the removable screw terminals, the Head Station re-enumerates the 32 PA slaves, and the DCS sees them again within the DP poll cycle. No laptop, no download, no “which firmware build” anxiety — a refreshing contrast to the firmware-sensitive ABB PCBA spares we have covered earlier in this series (P3LG, SAY130, PSTX motherboard, 1MRK002133, 3ADT309600 — all of those demanded revision matching; the ABB 3BDH000311R0101​ does not).Triple galvanic isolation (50 Veff each):​ The PL810​ isolates CH/DP, CH/Power, and PA/Power — three galvanic walls in one module. In a chemical-plant or refinery cabinet where the DP backbone (non-classified MCC room) and the PA segment (classified pipe-rack, long multicore or armored cable run back to the field) share the same 24 V DC auxiliary rail, that triple isolation is what keeps a PA-side ground loop or a cable-screen fault from propagating back to the DP master and blinking the whole Linking Device. The 50 Veff design isolation voltage is modest (this is not a 1500 V drive-board isolation), but it is correctly sized for the process-instrument envelope where the hazard is ground-offset and noise, not kV switching.32 PA devices per segment, 400 mA budget:​ The ABB 3BDH000311R0101​ allows up to 32 PROFIBUS PA slave devices on one PA segment — the maximum per PROFIBUS PA specification — and budgets ≤ 400 mA sustained at 24 V DC PA output. That is enough for a typical process-unit PA population: 10–12 smart control valves (each ~15–20 mA quiescent, plus modulation current which the spec notes “does not have to be considered” for the budget because it is superimposed on the DC, not drawn from the PSU), 8–10 4-wire PA transmitters (each ~10–15 mA), and a handful of PA digital/analog repeaters or analysis devices. For larger populations, you hang a second PL810​ behind a second channel of the HS 820/840 — the HS 840 gives 4 channels, so 4 × 32 = 128 PA devices off one LD 800P node.Zone 2 / Ex nA T4 certification:​ The ABB 3BDH000311R0101​ carries TÜV 02 ATEX 1886 X, II 3 G, Ex nA II T4 — meaning it is non-sparking, suitable for Zone 2 (the least severe classified zone, but still classified) where the PA instruments themselves are often Ex i (intrinsic safety) and the PA bus is the IS spur. The PL810​ itself is not Ex i (it supplies 24 V DC at up to 400 mA, which exceeds typical IS limits), so it lives in the non-classified cabinet and the PA cable runs into the classified area via an IS barrier/gateway if the instruments are Ex i — or directly if the instruments are Ex nA / increased safety. This certification matters for chemical, petrochemical, and refining specs where “no Ex rating” kills a BOM line.NAMUR NE 21 EMC for process-plant survivability:​ Process plants (especially chemical and refining) are EMI-rich — large VFDs on compressors, arc furnaces, switching transients on utility feeds. The ABB 3BDH000311R0101​ is tested to NAMUR NE 21 (the German process-industry EMC guideline), which is stricter than generic industrial EMC. That is why the PL810 is the standard PA-link choice in German and European chemical specs — the “NE 21” logo on the datasheet closes the EMC compliance paragraph in the instrument specification without a separate shielding/ferriting note.Removable screw terminals + DIN mount:​ The 20–35 V DC input, the PA output (18+, 17- / 3, 2+ style depending on build), and the Head-Station link (28+, 29-) all land on removable screw terminals (up to 2.5 mm²). When a PL810​ fails, you unplug the terminal blocks (label them first), slide the old module off the DIN, slide the new one on, plug the terminals back, done. No re-wiring the PA spur (which may be a 200 m armored multicore to the pipe rack) — that alone saves an hour of “who has the PA loop drawing” time during an outage.