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Key Technical Specifications
- Processor: PowerPC / MPC860 (Typical 400 MHz)
- Supply Voltage: 24V DC (Range: 19.2 – 30V DC)
- Power Consumption: Max 7.2 W (Typical 180 mA @ 24V DC)
- Memory: 16 MB RAM (10.337 MB available for application)
- Ethernet Interfaces: 2 x RJ45 (10 Mbit/s, supports redundancy)
- Serial Interfaces: 2 x RS-232C (COM3 for general use, COM4 for service)
- I/O Expansion: Modulebus (up to 96 I/O modules), CEX bus (up to 12 communication modules)
- Task Cycle Time: Minimum 1 ms
- Protection Rating: IP20 (Must be installed in a control cabinet)
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Mounting: DIN Rail with sliding lock mechanism
Product Introduction
The ABB PM856AK01 (3BSE066490R1) is a core processor unit within the AC 800M series, widely used in process automation industries like power, chemical, and water treatment. It acts as the central brain for managing local and remote I/O while executing complex control logic.A major advantage for system integrators is its flexible communication architecture. The controller supports up to 12 CEX bus communication modules (such as Profibus DP, Modbus TCP, or PROFINET) and features built-in CPU redundancy capabilities, which can switch over in under 10 ms to keep your production line running during a hardware failure.Installation & Configuration Guide
- Preparation (10 min): Ensure your control cabinet has a standard DIN rail. Verify your 24V DC power supply can handle at least 7.2 W per controller (add a 20% safety margin for the whole rack).
- Removal/Unboxing: Carefully inspect the module’s connectors for bent pins. (Always handle the PCB by the edges to prevent electrostatic discharge damage).
- Installation (10 min): Slide the PM856AK01 onto the DIN rail until the locking mechanism clicks into place. Connect the 24V DC power to the designated terminals and attach your Ethernet or serial cables to the front panel ports.
- Power-On & Test (10 min): Power up the rack. Check the front panel LEDs for “Power” and “Run” status. Connect your engineering PC via Ethernet and launch ABB’s Control Builder M software to establish a connection and download your application.
Troubleshooting Quick Reference
- Power LED is off: Measure the input voltage at the terminal block. It must be between 19.2V and 30V DC. Check for loose wiring or a tripped circuit breaker.
- Cannot connect via Ethernet: Verify your PC’s IP address is in the same subnet as the controller. Try swapping the Ethernet cable or using the secondary RJ45 port (CN2).
- Controller shows a fault/error LED: Connect via the COM3/COM4 serial port using a terminal tool to read the specific error code. It’s often a configuration mismatch or a missing I/O module.
- Application won’t download: Check if the controller’s firmware version is compatible with your Control Builder M project. A version mismatch is a very common roadblock.
Dimensions, Mounting & Wiring Notes
- Dimensions: 186 mm (H) x 119 mm (W) x 135 mm (D)
- Mounting: Designed for vertical installation on a 35 mm DIN rail inside an IP54 (or higher) electrical enclosure.
- Wiring: Use shielded twisted-pair cables for Ethernet and serial communications to prevent electromagnetic interference. Ensure the module is properly grounded via the DIN rail.
FAQQ: Does the PM856AK01 support redundancy?
A: Yes, it supports CPU redundancy. When paired with a second PM856AK01 and the correct synchronization setup, it provides a hot-standby configuration to ensure high system availability.Q: I have an old AC 800M system. Will this work with my existing I/O?
A: Generally, yes. It connects to S800 I/O modules via the Modulebus. However, always cross-reference your specific I/O modules with the latest ABB hardware manuals to avoid compatibility issues.Q: What software do I need to program this controller?
A: You will need ABB’s Control Builder M engineering tool. It supports all five IEC 61131-3 programming languages (LD, FBD, ST, IL, SFC).Q: What’s the difference between PM856AK01 and PM856K01?
A: The “A” in PM856AK01 typically indicates specific hardware revisions or enhanced features (like integrated Ethernet redundancy or specific battery backups). Always check the exact datasheet for your project’s firmware requirements.Q: I’m planning a new build. What’s the lead time on these?
A: Lead times for industrial automation hardware can fluctuate. If we don’t have immediate stock, typical procurement can take a few weeks. Reach out with your required quantity so we can give you an accurate delivery timeline.
