ABB PM877 (3BDH000777R1) – Processor Module for AC 800M / 800xA Control Systems

The ABB PM877, order code 3BDH000777R1, is a processor module used in AC 800M-based control systems, typically within ABB 800xA architectures. From my experience, it’s chosen when plants want solid CPU performance, stable Ethernet networking, and seamless S800 I/O integration without reworking their cabinet layout. You might notice that it fits right into existing BU8xx base units, which keeps retrofit work predictable and downtime short.

Typical use cases include controller upgrades in power generation, water & wastewater, chemicals, pulp & paper, and metals. One thing I appreciate is how it usually drops into established networks with dual 10/100 Ethernet and standard service access, so engineering teams can move projects forward without chasing obscure accessories.

Company’s Order Placement Process and Guarantees

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

Key Features

• AC 800M Compatibility – Works within ABB AC 800M controller families and 800xA environments, simplifying upgrades and spares strategies.
• Dual Ethernet (10/100) – Typically two RJ45 ports for control and network segregation; easy plant-level integration and engineering access.
• Service/Diagnostic Port – Front service port (commonly RS‑232C) for commissioning, firmware handling, and troubleshooting.
• S800 I/O Integration – No onboard I/O; pairs with S800 I/O over fieldbus interfaces for scalable, distributed I/O.
• Redundancy-ready Architecture – In many cases supports controller redundancy when used with the appropriate AC 800M accessories and configuration.
• CompactFlash/Memory Support – Project storage and backup typically handled via removable media for quick swaps in the field.
• Time Synchronization – NTP-based time sync commonly available through the system for consistent sequence-of-events timestamps.

Technical Specifications

Brand / Model	ABB PM877 – 3BDH000777R1
HS Code	8537.10 (Programmable control equipment/boards, global 6‑digit)
Power Requirements	24 V DC supplied via AC 800M base unit (BU8xx), nominal 24 V DC
Dimensions & Weight	Approx. H 186 × W 59 × D 127 mm; ≈ 0.6 kg (typical AC 800M form factor)
Operating Temperature	0 to +55 °C (industrial cabinet environment)
Signal I/O Types	No onboard discrete/analog I/O; uses S800 I/O over fieldbus/communication modules
Communication Interfaces	2 × 10/100Base‑T Ethernet (RJ45), 1 × service/maintenance port (commonly RS‑232C); CompactFlash slot
Installation Method	Mounted on BU810/BU812/BU814 base units; DIN‑rail cabinet mounting

Application Fields

Plants running ABB 800xA with AC 800M controllers usually adopt the PM877 for controller upgrades, expansions, or spares stocking. It’s well-suited for:

• Power generation and CHP units (boiler/turbine auxiliary control)
• Water & wastewater (filtration, pumping, disinfection trains)
• Chemicals and specialty chemicals (continuous and batch units)
• Pulp & paper (stock prep, paper machine auxiliaries)
• Metals and mining (material handling, utilities, drives coordination)

A maintenance supervisor recently told us the main benefit was “keeping the same toolchain and I/O footprint,” which meant no retraining and minimal documentation changes after the swap.

Advantages & Value

• Reliability – Proven AC 800M platform; typically stable even in mixed legacy/modern networks.
• Compatibility – Works with S800 I/O and common AC 800M communication interfaces like CI854A (PROFIBUS DP) or CI871 (EtherNet/IP), which keeps spare parts common.
• Lifecycle Savings – Extends your 800xA investment; avoids costly rip-and-replace migration.
• Serviceability – Removable media for backups; straightforward swap procedures reduce MTTR.
• Support – We can pre-load firmware and basic configuration so commissioning teams can plug in and verify quickly.

Installation & Maintenance

• Cabinet & Mounting – Install on BU810/BU812/BU814 base units on DIN rail inside a clean, ventilated cabinet; allow airflow around the module.
• Power & Grounding – Feed regulated 24 V DC to the base unit; maintain proper protective earth. Keep network and I/O cabling separated from high-voltage wiring.
• Networking – Use industrial Cat5e/Cat6 for the dual Ethernet ports; enable NTP time sync on the plant network for consistent event logs.
• Safety & ESD – Handle with ESD protection; de-energize the base unit before insertion/removal.
• Routine Care – Periodically back up the application to the memory card, check status LEDs/diagnostics, remove dust with dry air, and validate firmware updates in a staging area before applying.
• RTC Battery – If used with a real-time clock backup, replace the battery at the recommended interval to maintain timestamps during power loss.

Quality & Certifications

• Certifications: CE; UL/cUL (typical for AC 800M family); RoHS compliant
• Manufacturer Quality: Produced under ISO 9001 quality systems
• Warranty: 365 days (our supply policy)

Related and Supporting Components

• Base Units: BU810K02, BU812, BU814 (mounting/power interface for AC 800M CPUs)
• Communication Interfaces: CI854A (PROFIBUS DP), CI871 (EtherNet/IP), CI853 (SattBus) depending on installed networks
• S800 I/O: DI801/DO801/AI801/AO801 and related modules for discrete/analog expansion
• Power & Accessories: CompactFlash card for application storage; suitable 24 V DC industrial power supply and proper cabinet grounding hardware

If you’re replacing an older AC 800M CPU or preparing a cold spare, sharing your current firmware level and network topology typically helps us prep the PM877 so it deploys quicker on site.