Product Overview

The ABB PDP800​ is a redundant Profibus DP V0/V1/V2 Master Interface module positioned in ABB’s Symphony Plus S+ Control (SPC) and AC 800M / 800xA ecosystems, engineered to seat on a PTU810 communication/base I/O base (or AC 800M communication base TB850-class) and act as the Profibus DP segment master for up to 125 slave devices — S800 I/O remote stations, ABB ACS drives, third-party DP-V1/V2 instruments (transmitters, positioners, MCCs, flame scanners, intelligent MCC), and PROFIBUS PA devices via a third-party DP/PA linking device. Where the older ABB drive/DCS spare models we’ve covered (NPOW-41, NTAI05, NTMF01) belong to the matureBailey INFI 90 / Harmony lineage, the PDP800​ belongs to the currentSymphony Plus S+ and AC 800M generation — it is the designated Profibus DP master that lets an HPC800 S+ controller (or an AC 800M PM891-class CPU) talk DP-V2 to S800 I/O racks placed up to 15 km away on fiber, or to a crowded 1.2 km electrical segment at 12 Mbps.Hardware-wise the ABB PDP800​ (common order numbers 3BSE026363R001 and 3BHE014240R0101 depending on S+ SD Series vs SPC batch) is built around an MCF54418 ColdFire-class RISC at 160 MHz, with 128 MB DRAM and 4 MB Flash, drawing 24 V DC at ~150 mA (≈3.6 W) from the PTU810 / TB850 base backplane. The front face carries PWR / RUN / ERR / BF (Bus Fault) / SF (System Fault) LEDs and a Mini-USB diagnostic port for local laptop connection (ABB S+ Composer / AC 800M Control Builder can reach the PDP800​ for diagnostics, GSD management, and firmware maintenance without disturbing the bus). Physical interface is a 9-pin D-Sub (RS-485, isolated) for the DP segment; fiber media (up to 15 km) is reached via external OLM — the PDP800​ itself speaks electrical DP, the OLM does the electro-optical conversion. The module is hot-swappable​ — a defining advantage over the INFI 90-era NTAI/NPOW family we covered earlier — so a failed PDP800​ can be pulled and reseated while the redundant mate and the HPC800 / AC 800M controller keep the DP segment alive with no process perturbation, provided the redundancy is configured (dual PDP800​ + A/B line is the S+ reference build).Protocol support is the headline: DP-V0 (cyclic I/O, the “bare metal” DP that most 1990s–2000s DP devices still run), DP-V1 (acyclic RD/WR, alarm handling, non-cyclic diagnostics — needed for smart valves and PA-link devices), and DP-V2 (1 ms source-end timestamp for SOE, isochronous mode, MSx multi-slave sync — needed for turbine protection sequencing and multi-axis drive sync). The DP-V2 1 ms timestamp is executed at the slave(e.g., S800 I/O DI card with SOE, or TP800 turbine-protection DI) and forwarded by the PDP800​ to the HPC800 with the 1 ms tag intact — this is what lets a sulfur-recovery unit or a turbine trip log resolve “did the pressure switch or the relief valve move first” at millisecond resolution, which DP-V0/V1 cannot do.Lifecycle note: ABB’s public spare channels list the PDP800​ as “Legacy” on some regional pages (), but it remains the current-designated Profibus master in Symphony Plus S+ Control (PIO800K02 article on ABB’s hardware selector is still live ) and is also deployable on AC 800M racks via the TB850 base. New-from-ABB lead-times can be long; spare-channel demand (NOS / refurb / OEM-overstock) is steady for plants with frozen S+ and AC 800M BOMs — power-gen (HPC800 + S800 I/O + turbine modules), metals (multi-axis rolling over DP-V2 sync), paper (multi-drive line coordination), alumina/alu electrolysis (distributed S800 I/O on 15 km fiber).

Technical Specifications

Main Features and Advantages

DP-V2 1 ms Source Timestamp (SOE).​ The PDP800‘s DP-V2 support is what separates it from a generic DP-V1 master (like the older CI854A on AC 800M). When an S800 I/O DI card with SOE capability (or a TP800 turbine-protection DI) captures an event, it stamps it at the sourcewith 1 ms resolution and pushes it up the DP-V2 telegram to the PDP800, which forwards it to the HPC800 controller with the timestamp intact. On a turbine trip or a sulfur-recovery relief sequence, this 1 ms granularity is what lets the analysis engineer resolve “did the PSHH close before or after the XV vent opened” — DP-V0/V1 would only give the controller scan-resolution (typ 10–50 ms), which is unusably coarse for protection-sequence forensics. The PDP800​ + HPC800 + TP800/VP800 is ABB’s S+ Turbine canned solution, and the DP-V2 timestamp is the enabler.125 Slaves + 12 Mbps + 15 km Fiber.​ A single PDP800​ masters up to 125 DP slaves on one segment — that’s enough for a full S800 I/O yard (say 8–10 S800 racks × 8–16 I/O cards each, plus a few ACS880 drives and some PA-link valve-positioners) on one PDP800​ (or one redundant pair sharing load). At 12 Mbps the electrical segment is short (30 m drops, 1.2 km backbone @ lower baud), but the PDP800​ design expects OLM fiber extenders — 15 km reach means the S800 I/O racks can live at the far end of a hydro plant’s dam-crest, or at the far end of an alumina refinery’s digestion line, while the HPC800 sits in the central control building 10 km away, talking over HN800 (controller↔PDP800) + fiber DP ( PDP800↔remote S800). This “controller on HN800, I/O on DP fiber” topology is S+’s answer to large-footprint process plants where central I/O would mean 20 km of homerun cables.Module + Line Redundancy, Hot-Swap.​ The PDP800​ supports dual-module redundant pairs (both seated on PTU810 bases in the same S+ node or AC 800M rack) with 1+1 hot standby — if one PDP800​ fails (BF LED red, ERR lights), the mate keeps the DP segment alive, the HPC800/AC 800M sees a redundancy-switch event in the S+ Composer log, and process control has no perturbation. Line redundancy (A/B dual cable) is also supported — each PDP800​ can drive two DP cables to the same slave ring or to two OLMs, so a cut cable doesn’t drop the segment. And the PDP800​ is hot-swappable in redundant config— pull the failed unit, seat the new one, the base backplane re-downloads the DP configuration (GSD, slave map, V2 parameters) from the HPC800/AC 800M, and the segment’s second PDP800​ never blinked. This is a major operational advantage over the INFI 90-era NTAI05/NPOW-41 family (none of which are hot-swap) — a PDP800​ swap on a live S+ node is a 5-minute “clip out, clip in, watch RUN come back” job, not a LOTO + 20-minute reboot.Mini-USB Local Diagnostics + BF LED Semiotics.​ The front Mini-USB lets a service laptop (S+ Composer or ABB’s diagnostic utility) talk to the PDP800​ directly without going through the HN800 → HPC800 path — useful when the HN800 itself is suspect or when commissioning a remote S800 yard and the laptop is local to the PDP800​ cabinet. The LED set is purposeful: PWR = 24 V from base present; RUN = module executing DP scan; ERR = internal fault (DRAM/Flash/RISC); BF (Bus Fault) = DP segment issue (cable cut, baud mismatch, slave not responding, no terminator) — BF flashingtypically means “configured but can’t see slaves” (check DB-9 terminator 220 Ω at both ends, check baud on the PDP800​ vs slave), BF solidusually means “not configured or severe collision.” SF = system fault (base backplane, redundant mate lost). A Friday-night “whole S800 yard dropped off HPC800” callout starts at the PDP800​ BF LED — 80 % of the time it’s a terminator resistor fallen off the far-end S800 rack’s DP-In connector, not the PDP800​ itself.DP-V2 Isochronous + MSx for Multi-Axis Sync.​ Beyond SOE, DP-V2 on the PDP800​ enables isochronous mode (deterministic cycle, same scan on all slaves) and MSx (multi-slave synchronize) — these are what let an S+ node run multi-axis rolling-mill stands or turbine governor+valve+generator-sync (AS800) with sub-ms coordination across 20–40 DP slaves. The PDP800​ itself doesn’t execute the control loop (that’s HPC800 or AC 800M PM891), but it guarantees the DP-V2 telegram cycle is deterministic and timestamped, which the controller’s CFC/FBD then uses for the actual sync math. This is why metals and turbine OEMs specify PDP800​ rather than a cheaper DP-V1-only master — DP-V1 can’t do isochronous/MSx.S+ Turbine & PA Integration.​ The PDP800​ is the DP master in ABB’s S+ Turbine reference builds: HPC800 + PDP800​ + TP800 (turbine protection DI, SOE), VP800 (valve position, DP-V2 actuator), AS800 (generator auto-sync), MCM800 (condition monitoring) — all hang on the same DP-V2 segment behind one (redundant) PDP800, with 1 ms SOE from TP800 flowing to the HPC800 for trip analysis. And for process plants still running PROFIBUS PA field instruments (smart pressure/temp/flow Tx, valve positioners), the PDP800​ reaches them via a third-party DP/PA link coupler (ABB resells these, but the PDP800​ itself just sees “DP slave = DP/PA link” and tunnels the PA acyclic V1 traffic through). This means one PDP800​ segment can serve S800 I/O + turbine modules + ACS drives + PA instruments — consolidated.