ABB PM591-ETH (1SAP150100R0270) – AC500 PLC CPU with integrated Ethernet for reliable mid-range control

The ABB PM591-ETH is a modular AC500 CPU that brings dependable performance, integrated Ethernet, and flexible fieldbus expansion into one compact unit. From my experience, it’s a solid choice when you need a CPU that can handle motion, discrete, or process tasks without overcomplicating the panel. You might notice that it pairs especially well with S500 I/O and ABB communication modules when plants evolve and more connectivity is needed.

Company’s Order Placement Process and Guarantees

Key Features

• Integrated Ethernet (10/100 Mbps): Typically used for programming, SCADA links, and peer-to-peer controller networking without extra modules.
• Versatile serial port: Commonly provides RS-232/RS-485 for legacy devices, HMIs, barcodes, or simple drives—handy in retrofit jobs.
• Modular AC500 ecosystem: Scales with S500 I/O and add-on communication modules, so the platform grows as your line grows.
• Reliable 24 V DC operation: Suited for standard industrial cabinets; stable even with typical plant power noise when grounded correctly.
• No onboard I/O: Clear separation of CPU and I/O lets you choose only the modules you need—keeps costs tidy in many cases.
• Engineering with Automation Builder: Program with ABB’s toolchain for structured diagnostics and lifecycle maintenance.

Technical Specifications

Application Fields

The PM591-ETH is typically deployed in discrete manufacturing lines, packaging machines, material handling, pumping stations, and mid-size process skids. One thing I appreciate is how easily it sits between legacy serial equipment and modern SCADA over Ethernet—useful in brownfield upgrades where downtime is tight. In utilities and building automation, the Ethernet plus modular I/O make it a neat central controller for distributed panels.

Advantages & Value

• Reliability: Mature AC500 platform with stable firmware—reduces nuisance stops and saves service calls.
• Compatibility: Works with S500 I/O and a broad range of ABB fieldbus modules; easy tie-in to SCADA/HMI via Ethernet.
• Cost control: No forced over-spec—add only the I/O and comms you need, now or later.
• Lifecycle support: Engineering with Automation Builder streamlines commissioning, version control, and firmware maintenance.

Customer feedback: “Swapped a legacy PLC for PM591-ETH over a weekend. We kept our RS‑485 meters and moved the SCADA to Ethernet—no headaches, and spare parts are easy to get.”

Installation & Maintenance

• Panel environment: Install in a ventilated control cabinet; maintain clearance for airflow; avoid direct heat sources and vibration.
• Power & grounding: 24 V DC with proper protective earth; use separate power rails for noisy loads when possible.
• Wiring: Shield Ethernet/serial cables in high-EMI areas; maintain bend radius; label ports for maintenance clarity.
• I/O expansion: Add S500 I/O modules locally or remote as needed; keep module counts within ABB’s recommended limits.
• Routine care: Back up program and parameters, check terminal tightness quarterly, and update firmware during scheduled downtime.
• Safety: De-energize before servicing; follow lockout/tagout and local electrical codes.

Compatible Components (Examples)

• S500 I/O modules: Digital and analog I/O variants for local and remote expansion in the AC500 system.
• Communication modules: CM579-PNIO (PROFINET IO), CM577-ETHCAT (EtherCAT), CM575-CN (CANopen) to extend fieldbus connectivity.
• Operator panels: ABB HMIs over Ethernet or serial for straightforward commissioning and diagnostics.

Quality & Certifications

• CE compliant
• UL listed (typical for AC500 family)
• RoHS compliant
• Manufacturer’s standard warranty complemented by a 365-day supplier warranty