Overview
Manuals
Pair Scope
CPU Limits
I/O Layout
Features:
- The 3BSE018160R1 order number denotes two PM861AK01 processor units with TK850 CEX-bus expansion and TK851 RCU-Link cables, rather than a single bare PM861A CPU.
- Each MPC860 processor operates at 48 MHz with 16 MB RAM and 7.155 MB application space; the official maximum redundancy switchover is 10 ms, separate from application-cycle timing.
- A redundant PM861A arrangement supports optical ModuleBus I/O and the specified CEX-bus interfaces; the electrical ModuleBus cluster and serial-port restrictions must be checked before restoring an existing configuration.
PM861AK02 3BSE018160R1 is ABB's redundant processor-unit package based on the PM861A CPU. The official System 800xA catalog defines it as two PM861AK01 processor units together with a TK850 CEX-bus expansion cable and a TK851 RCU-Link cable. Each underlying processor operates at 48 MHz, contains 16 MB RAM and provides 7.155 MB for application use. The AC 800M outline documents CPU redundancy, a maximum 10 ms switchover and configurable application execution down to 1 ms. The two Ethernet connections on the baseplate serve the Control Network, while CEX-bus interfaces and optical ModuleBus clusters connect the required communication and I/O equipment. Capacities remain subject to the redundant-system limits: two processors do not double the usable application memory. ABB marks PM861A as Classic in the cited 2020 outline. For an existing installation, retain the verified CPU generation, software compatibility and full accessory configuration when specifying a replacement package.
Before replacing PM861AK02 3BSE018160R1, record the installed position, hardware revision, mounting or connector arrangement, paired assemblies and every applicable ABB service record. Compare the supplied unit with the original item and approved configuration, isolate all relevant energy sources, and follow the documented installation procedure. After installation, inspect every affected mechanical, electrical and communication interface and complete controlled functional checks before returning the equipment to service.
The PM861AK02 3BSE018160R1 ABB Redundant processor kit is listed as Active / Available from OEM. Current revision, availability and supplied scope are confirmed in the written quotation.
ABB PM861AK02 3BSE018160R1 documentation and reference links.
Important Notice: Every linked document must identify the listed model or its documented family. Confirm the complete order code, hardware revision and installed-system requirements before replacement.
The historical ABB System 800xA catalog describes 3BSE018160R1 as two PM861AK01 processor units plus TK850 and TK851 interconnection cables. Check the actual package inventory and both CPU identities before treating an offer as a complete PM861AK02 kit.
Each PM861A provides 16 MB RAM, 7.155 MB application space and a 48 MHz MPC860 processor. Redundancy does not pool these resources. Keep application load, task scheduling and communication requirements within the documented per-controller limits.
The redundant PM861A architecture uses optical ModuleBus clusters, with up to 84 I/O modules. The published serial-port data apply to nonredundant operation; preserve the verified network and communication-module arrangement during replacement.
