Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | PM861AK01 |
| Order number | 3BSE018157R1 |
| Product type | AC 800M processor unit kit |
| Controller family | ABB AC 800M / System 800xA |
| Processor | MPC860 |
| Clock frequency | 48 MHz |
| Memory | 16 MB RAM |
| Application memory | 7.155 MB listed in the referenced datasheet |
| Power supply | 24 V DC |
| Input voltage range | 19.2–30 V DC |
| Typical power dissipation | 6.0 W |
| Maximum listed power dissipation | 10.3 W |
| Ethernet ports | 2, RJ45 |
| Ethernet interface | IEEE 802.3, 10 Mbit/s |
| Serial interfaces | 2 service/general-purpose RS-232C interfaces, subject to configuration |
| CPU redundancy | Supported in an appropriately configured system |
| Baseplate | TP830 included in the documented kit |
| Included hardware | PM861A CPU, TP830 baseplate, bus terminators, memory-backup battery, and power plug |
| Lifecycle status | Classic; verify current support status |
| Condition | Confirm for the actual unit |
Application Scenarios & Pain Points
- Process control: Executes configured controller logic for supported process and manufacturing applications.
- Controller replacement: Provides a replacement option when the installed unit is specifically identified as PM861AK01, subject to firmware and hardware checks.
- Redundant controller systems: Supports architectures designed to maintain control availability during a controller fault or switchover.
- Legacy System 800xA maintenance: Helps maintain existing installations where a complete migration is not immediately practical.
A common commissioning problem is treating a CPU replacement as a simple hardware swap. The controller may power up correctly but still require the appropriate application, firmware compatibility, communication settings, and redundancy checks. Back up the application and document the existing configuration before removing the installed unit.
PM861AK01
Related Products
These ABB products belong to related controller families or support hardware categories. They are not automatically interchangeable.
- PM861AK02 — Redundant processor-unit package associated with two PM861AK01 units; confirm the complete kit and system arrangement.
- PM860AK01 — AC 800M processor unit from a related controller family, with different performance and memory characteristics.
- PM856AK01 — AC 800M processor unit for applications designed around its specific hardware capabilities.
- PM858K01 — AC 800M controller option with different processor and memory specifications.
- TP830 — Baseplate included in the PM861AK01 kit; verify the installed baseplate and terminal arrangement.
- TB850 — CEX-bus terminator listed among the kit’s associated hardware.
- TB807 — ModuleBus terminator listed among the kit’s associated hardware.
- TB852 — RCU-Link terminator listed in the PM861AK01 package documentation.
- ABB AC 800M communication modules — Communication hardware for supported controller configurations; check the CEX-bus layout and firmware requirements.
The Engineer’s Guide
Trap 1: Confusing PM861AK01 with PM861AK02
Warning: The K01 and K02 designations refer to different package configurations. Do not assume a single processor unit and a redundant processor package contain identical hardware.
Practical tip: Check the complete order number, required CPU count, baseplates, terminators, and redundancy architecture against the existing cabinet drawings.
Trap 2: Overlooking firmware and application compatibility
A matching processor model does not guarantee compatibility with every installed controller firmware or engineering-tool version.
Practical tip: Record the running firmware, controller configuration, application backup, and System 800xA / Control Builder version before replacement. Confirm the supported recovery and commissioning procedure for the installed system.
Trap 3: Assuming the CPU alone contains everything needed
The documented kit includes a baseplate and other associated hardware. A loose CPU and a complete processor-unit kit are not necessarily equivalent supply items.
Practical tip: Request a written package-content list. Confirm whether the TP830 baseplate, bus terminators, battery, and power plug are included and whether the existing installation can reuse its hardware.
Frequently Asked Questions
1. What is the ABB used for?
The is an AC 800M processor unit used to execute control applications in supported industrial automation systems. It can be used in System 800xA environments when the controller hardware, firmware, and engineering configuration are compatible.
2. What is the order number for ?
The associated ABB order number is 3BSE018157R1. Check both the model designation and order number on the installed unit and purchase documentation before ordering.
3. Does the support CPU redundancy?
Yes. ABB’s documentation identifies CPU redundancy support for the PM861A controller. A functioning redundant installation also requires a compatible second controller and the correct system configuration, communication paths, and switchover setup.
4. What power supply does the require?
The documented supply is 24 V DC, with an input range of 19.2–30 V DC. Check the cabinet supply, wiring, grounding, and installation requirements before energizing the replacement.
5. Can I replace with PM860AK01 or another AC 800M CPU?
Do not assume direct interchangeability. Related AC 800M processors can differ in performance, memory, redundancy support, and firmware compatibility. Confirm the approved migration or replacement path using the installed application and controller documentation.
6. What should be included with a processor unit kit?
The referenced kit documentation lists the PM861A CPU, TP830 baseplate, TB850 CEX-bus terminator, TB807 ModuleBus terminator, TB852 RCU-Link terminator, memory-backup battery, and a four-position power plug. Verify the actual shipment contents rather than relying on the product title alone.
7. Is the still supported, and what are the lead time and warranty?
The referenced ABB datasheet classifies as Classic. Current support, stock, delivery time, and warranty must be confirmed for the specific order and unit. Ask the supplier to state the hardware condition, included accessories, available test records, warranty terms, and return policy in writing.
