ABB PM857K01 (3BSE088385R1) — AC 800M controller CPU for reliable process automation and 800xA upgrades

The ABB PM857K01 is a compact, mid‑to‑high performance CPU unit for the System 800xA / AC 800M platform. From my experience, it’s a sweet spot for plants that need faster scan times and stable communications without jumping straight into the highest-end redundant CPUs.
Typical deployments include chemical batching, metals finishing lines, water treatment trains, and brownfield 800xA modernizations where you want to keep S800 I/O and add modern Ethernet connectivity and diagnostics.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week for in‑stock; no more than one month at the latest
• Payment terms: 50% advance payment; full payment before delivery
• Express options: FedEx, UPS, DHL

Key Features

• AC 800M platform compatibility – Works within System 800xA environments, so it typically drops into existing S800 I/O architectures with minimal rewiring.
• Dual Ethernet 10/100 – Two RJ‑45 ports for control network and service access, making segmentation and maintenance simpler in many cases.
• ModuleBus & CEX expansion – Connect S800 I/O locally and add communication modules (like PROFIBUS or PROFINET) on the CEX bus for multi‑protocol plants.
• Service serial port – Handy for commissioning, local diagnostics, or connecting serial instruments where needed.
• Industrial CompactFlash storage – Firmware and application storage on CF media; easy to keep a spare image for rapid recovery.
• 24 VDC powered – Common cabinet power spec with straightforward wiring and low power draw.
• Kit convenience (K01) – You might notice the “K01” typically indicates a kit that includes the PM857 controller unit with CompactFlash and required accessories for quick start-up.

Technical Specifications

Related or Supporting Products

• PM856AK01 – Earlier‑generation AC 800M CPU; suitable for lighter applications. PM857K01 offers a performance uplift.
• PM864AK02 – Higher performance CPU with more headroom for large projects; often used where faster cycle times are critical.
• PM865K01 / PM866K01 – For high availability with controller redundancy; used in continuous process lines.
• CI854A (PROFIBUS DP), CI869 (PROFINET), CI868 (IEC 61850), CI871 (EtherNet/IP) – CEX communication modules commonly paired with PM857K01.
• S800 I/O such as DI801, DO801, AI801, AO801 – Standard I/O modules for field signals.
• TP830 / TP850 baseplate and industrial CompactFlash – Typical mounting and storage media used with PM8xx controllers.

Installation & Maintenance

• Cabinet environment: Keep ambient 0–55 °C with gentle airflow; leave space above/below the module for ventilation.
• Power & grounding: 24 VDC regulated supply with proper protective earth; segregate signal, power, and network cabling to reduce noise.
• Networking: Use industrial‑rated Cat5e/Cat6; it appears that separate maintenance and control networks reduce unintended traffic.
• I/O wiring: Land field signals on S800 I/O TBs; verify ModuleBus/CEX addressing in Control Builder before energizing.
• Firmware & backups: Keep a cloned CompactFlash and export application backups; schedule firmware updates during planned stops.
• Battery/RTC: If your kit includes a battery, replace on interval and log the date; real‑time clock drift can affect time‑stamped sequences.
• Routine checks: Review diagnostics, network load, and scan time trends quarterly; clean dust and check terminal tightness annually.

Quality & Certifications

• CE compliant; typically cULus listed for industrial control equipment
• RoHS compliant materials
• Manufactured under ISO 9001 quality systems
• Standard warranty: 365 days (see Order Placement & Guarantees)