PM851AK01 | ABB 3BSE066485R1 AC 800M Entry-Level Processor Unit Kit

Product Overview

The ABB PM851AK01 (3BSE066485R1) is an entry-level Processor Unit Kit for the AC 800M controller family. It includes the PM851A processor and all required accessories, offering cost-effective control for small-scale automation applications.

Key Specifications

• Manufacturer: ABB
• Part Number: PM851AK01 (3BSE066485R1)
• Product Type: AC 800M Processor Unit Kit
• CPU: MPC860
• Memory: 12 MB SDRAM
• Performance: 0.23 ms per 1000 boolean operations
• System: AC 800M / System 800xA
• Kit Includes: PM851A CPU, TP830 Baseplate (115mm), TB850 CEX-Bus Terminator, TB807 ModuleBus Terminator, TB852 RCU-Link Terminator, Battery for memory backup (4943013-6)
• Communication: 1× RJ45 Ethernet (CN1 only), RS-232C, ModuleBus, CEX-Bus
• Redundancy: Not supported
• Power Supply: 24 V DC (19.2–30 V DC)

Applications

• Small PLC replacements
• Skid-mounted unit control
• Remote I/O concentrators
• Basic process control

FAQ

Q: Does PM851A support redundant Ethernet?
A: No, PM851A has only one Ethernet port (CN1). Redundant Ethernet requires PM858 or higher.

Q: What is the performance compared to PM864A?
A: PM851A is an entry-level CPU suitable for smaller applications. PM864A offers significantly higher performance (0.15 ms vs 0.23 ms per 1000 boolean operations).

Installation Guide

1. Mount TP830 on DIN rail.
2. Install PM851A processor.
3. Connect 24 V DC power.
4. Wire Ethernet to CN1 and serial ports as needed.
5. Download application via Control Builder M.

Selection Tips

• Choose PM851AK01 for small, non-redundant applications with limited I/O points.
• For redundancy or larger applications, upgrade to PM858K01 or PM864AK01.