Overview
The ABB PM861AK02, also cataloged as the PM861AK02 Redundant Processor Unit, operates as a dedicated hardware component for redundant CPU execution and controller synchronization within ABB AC 800M and System 800xA control platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PM861AK02 |
| Brand | ABB |
| Product Type | Redundant Processor Unit |
| System Platform | ABB AC 800M / System 800xA |
| Processor Configuration | Dual PM861A CPU configuration |
| Redundancy Function | Processor redundancy with RCU-Link synchronization |
| Package Components | PM861A CPU, TP830 Baseplate, TK850 CEX-bus cable, TB807 Modulebus terminator, TK851 RCU-Link cable, memory backup batteries |
| Weight | 2.9 kg |
| Dimensions | 135 mm depth x 186 mm height x 119 mm width |
| Memory Backup | Lithium battery backup included |
| Battery Quantity | 2 units |
| Battery Type | Portable lithium battery |
| Battery Weight | 9 g each |
| Communication Interface | CEX-bus and RCU-Link communication |
| Mounting Base | TP830 Baseplate, width 115 mm |
| Protection Classification | WEEE Category 5 |
Industrial Control Network Integration and Redundant CPU Synchronization
The PM861AK02 uses a dual CPU architecture with two PM861A processor units installed in a redundant configuration. Therefore, the controller maintains synchronized execution states through the TK851 RCU-Link cable and supports coordinated processor operation.
The module package includes TK850 CEX-bus expansion cable components, which provide internal communication between controller hardware sections. In addition, the TB807 Modulebus terminators complete the communication bus arrangement for correct system configuration.
ABB AC 800M platforms use backplane bus communication methods to exchange controller data between processor units and I/O modules. Furthermore, firmware flash compatibility and controller configuration management determine supported system software versions during engineering and maintenance operations.
Frequently Asked Questions
Q: What components are included in the PM861AK02 redundant processor kit?
A: The kit includes two PM861A CPUs, two TP830 baseplates, one TK850 CEX-bus expansion cable, two TB807 Modulebus terminators, one TK851 RCU-Link cable, and two memory backup batteries.
Q: How does the PM861AK02 achieve processor redundancy?
A: The PM861AK02 uses two synchronized PM861A processor units connected through the RCU-Link interface. The redundant configuration allows coordinated controller execution between CPU modules.
Q: Does the PM861AK02 include memory backup protection?
A: Yes. The package includes lithium batteries for memory backup, with one battery installed for each processor unit.
Field Installation Guidelines
- Install the PM861AK02 processor units on the specified TP830 baseplates according to ABB AC 800M hardware configuration requirements.
- Verify correct placement of both PM861A CPUs before connecting the TK851 RCU-Link cable.
- Install the TK850 CEX-bus expansion cable with proper mechanical alignment to prevent connector damage.
- Confirm TB807 Modulebus terminators are installed at the required bus termination points.
- Route communication cables separately from high-current power wiring to reduce electromagnetic interference.
- Connect protective grounding according to the cabinet electrical design and industrial control panel standards.
- Replace lithium backup batteries using approved components and follow site battery handling procedures.
- Verify controller firmware compatibility before commissioning the redundant processor configuration.
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