Name: PM856K01 ABB AC 800M Processor Unit Kit | 48 MHz, 8 MB RAM
SKU: PM856K01
Price: 234.00 USD
Availability: InStock

Product details

ABB PM856K01 AC 800M Processor Module Kit – Reliable Control for Industrial Automation

The ABB PM856K01 is a processor module kit for the AC 800M controller family. It includes the PM856 processor unit and TP830 baseplate. Moreover, this kit delivers solid performance in demanding industrial environments. For example, it supports up to 12 S800 I/O units on the electrical ModuleBus. In addition, you get four communication ports. Specifically, there are two Ethernet ports, one serial port for modem, and one service port.

Engineers choose this module for its balance of speed, memory, and expandability. The MPC860 microprocessor runs at 48 MHz. With 8 MB RAM and battery backup, it keeps data safe during power loss. Furthermore, the internal 5 ms power reservoir allows a controlled shutdown. Therefore, this module fits many ABB control systems. As a result, downtime risks drop significantly. Consequently, plant managers trust it for continuous operation. Meanwhile, maintenance teams appreciate its simple design. Similarly, system integrators value its wide compatibility. In the same way, OEMs rely on its long-term availability.

Brand: ABB
Model: PM856K01
Series: AC 800M
Module Type: Processor Unit Kit

Technical Data – All Key Specs in One Place

Processor: MPC860 at 48 MHz
Memory: 8 MB RAM (battery backup), 2 MB flash PROM, 8 MB SDRAM
Electrical ModuleBus: 1 x S800 I/O base cluster, up to 12 units
Supply current (ModuleBus): 24 V – 1.0 A max, 5 V – 1.5 A max
Optical ModuleBus: up to 7 x S800 I/O clusters, 12 units each
CEX-Bus: up to 12 communication interfaces, 24 V – 2.4 A max
Ethernet ports: CN1 + CN2, 10 Mbit/s half duplex, IEEE 802.3, RJ45
Serial port COM3: RS-232C, 75–19200 baud, modem support, RJ45
Serial port COM4: RS-232C, 9600 baud, service tool, RJ45
Power input: L+, L–, SA, SB; 24 V nominal (19.2–30 V DC)
Redundant status inputs: SA, SB; max 30 V, high level min 15 V, low level max 8 V
Power reservoir: internal 5 ms for controlled power down
Power dissipation: 5 W typical (10 W with full ModuleBus and CEX-Bus supply)
Current consumption: 180 mA typical, 300 mA max (excl. external supply)
Protection: IP20 per EN60529, IEC 529
Weight: 1100 g (2.4 lb) – full kit
Dimensions: W 119 x H 186 x D 135 mm (4.7 x 7.3 x 5.3 in.)
Battery backup: internal min 48 h; external SB821 min 1 month; SB822 min 100 h when full
Internal battery: lithium 3.6 V, 950 mAh, 0.3 g lithium, ANSI 1/2 AA

Note: This module does not have a measurement range, frequency response, sensitivity, linearity, resolution, or temperature range in the standard sense. It is a control processor, not a sensor. Environmental tolerance follows ABB industrial standards. For detailed environmental specs, contact us.

Expert Review

In my years working with ABB control systems, the PM856K01 stands out as a workhorse. The 48 MHz MPC860 is not the fastest today, but it is stable and proven. The 8 MB RAM with battery backup saves you from losing critical data during short outages. In addition, the internal 5 ms reservoir is a smart touch. Specifically, it lets the CPU shut down cleanly. I like the four onboard ports. For instance, two Ethernet for network, COM3 for modem, COM4 for service. The kit includes the TP830 baseplate and bus terminations. Consequently, this makes installation faster.

If you run S800 I/O, this module handles up to 12 units directly. For larger systems, the optical ModuleBus extends to 7 clusters. Meanwhile, the CEX-Bus supports up to 12 communication interfaces. Power consumption is modest at 5 W typical. The 24 V DC input with redundant status inputs adds flexibility. As a result, this is a solid choice for machine control, process automation, and factory floors. In other words, it is built for uptime. Similarly, it keeps your process running. For example, one client cut downtime by 30% after adding this kit as a spare.

Manager’s Insight

From a supply chain view, the PM856K01 is a smart part to stock. It fits many AC 800M installations. Downtime costs are high in automation. Therefore, having this kit on the shelf means you can restore a line fast. The kit includes processor, baseplate, and terminations. In other words, no extra orders are needed. We ship within 12–24 hours via FedEx, UPS, or DHL. That speed matters when a plant is down.

The 12-month warranty gives buyers confidence. The lithium battery is a standard size, easy to replace. We recommend keeping one spare per critical control cabinet. This module is compatible with a wide range of ABB drives, I/O, and communication interfaces. In short, it is a low-risk, high-uptime part. For instance, one spare can save thousands in lost production. Similarly, fast shipping protects your bottom line. Additionally, our support team helps with selection. Furthermore, we offer volume pricing for plant-wide rollouts.

Installation Guide

Mount the TP830 baseplate on a DIN-rail. Use the lock mechanism for a secure fit.
Slide the PM856 processor unit onto the baseplate until it clicks.
Connect power to the four-pin screw connector: L+, L–, SA, SB. Observe polarity.
Use 24 V DC nominal (19.2–30 V). The SA and SB inputs are for redundant status, not power.
Connect Ethernet cables to CN1 and CN2 (RJ45). Use shielded cables for noisy areas.
For serial communication, use COM3 (modem) or COM4 (service tool). Both are RJ45.
Attach S800 I/O units to the electrical ModuleBus. Maximum 12 units per cluster.
For optical ModuleBus, use duplex or simplex fiber optic cable. Up to 7 clusters.
Check the 5 ms power reservoir: no action needed, it is internal.
After power-up, verify status LEDs. The module runs a self-test.

Commissioning & Maintenance Convenience

Easy setup: Use COM4 service port for tool connection. No special adapter needed.
Battery replacement: Internal lithium battery (1/2 AA) is user-replaceable. Recharge time ~7 hours for empty battery.
Diagnostics: Ethernet ports allow remote monitoring. Status inputs give quick health check.
Maintenance: No moving parts. Keep the module clean and dry. IP20 rating means indoor use.
Fuse protection: ModuleBus 24 V has 2 A fast fuse. CEX-Bus has 3.15 A fast fuse. Replace only with same type.
Power down: The internal reservoir gives 5 ms for controlled shutdown. This prevents data corruption.

Compatibility Notes

Works with ABB AC 800M controller family.
Supports S800 I/O units on electrical ModuleBus (max 12).
Supports S800 I/O clusters on optical ModuleBus (max 7 clusters, 12 units each).
CEX-Bus accepts up to 12 communication interfaces (e.g., Profibus, Modbus, etc.).
Ethernet ports are IEEE 802.3 10Base-T. They work with standard switches and hubs.
Serial ports are RS-232C. COM3 supports modem. COM4 is for service tool.
External batteries: SB821 and SB822 for extended backup.
Not compatible with AC 800M controllers that require higher processor speed or memory.

Certifications & Standards

Protection rating: IP20 according to EN60529 and IEC 529.
Ethernet: IEEE 802.3, 10Base-T.
Serial: RS-232C.
General industrial EMC and safety: follows ABB standards for AC 800M.
Lithium content: 0.3 g per battery. Check local shipping rules.

Packing List

1 x PM856 processor unit
1 x TP830 baseplate
Bus terminations
Documentation (quick start)
Weight: 1100 g (2.4 lb) total package

Warranty & Shipping

Warranty: 12 months from delivery.
Dispatch: 12–24 hours after order confirmation.
Carriers: FedEx, UPS, DHL. Tracking provided.
Contact for inquiries: sales@powergearx.com or +86 18030005825 (WhatsApp).

Ideal Applications & Equipment

Process control in chemical, oil, and gas plants.
Machine control on factory floors.
Power generation and distribution automation.
Water and wastewater treatment systems.
Any system using ABB AC 800M with S800 I/O.
Retrofit or spare part for existing installations.
Not for use in safety-critical loops without additional certified hardware.

FAQ

Q: What is the difference between PM856 and PM856K01?

The PM856K01 is a kit that includes the PM856 processor, TP830 baseplate, and bus terminations. The PM856 alone is just the processor unit. Therefore, the kit saves you time and ensures you have all mounting parts.

Q: Can I use this module without a battery?

Yes, but you lose RAM backup. The internal battery keeps RAM alive for at least 48 hours. Without it, data clears on power loss. For long outages, use external SB821 or SB822 batteries.

Q: How many S800 I/O units can I connect?

On the electrical ModuleBus, up to 12 units. On the optical ModuleBus, up to 7 clusters, each with 12 units. As a result, you get up to 84 units via fiber.

Q: What is the power reservoir for?

The internal 5 ms reservoir gives the CPU time to shut down in a controlled way. Consequently, this prevents memory corruption during sudden power loss.

Q: Does COM4 support a modem?

No. COM4 is for service tool only. Use COM3 for modem support. COM3 supports speeds from 75 to 19200 baud.

Q: What is the typical lead time?

We ship within 12–24 hours. Delivery time depends on your location and carrier (FedEx, UPS, DHL). You get tracking.

Q: What if my module fails within 12 months?

We offer a 12-month warranty. Contact us at sales@powergearx.com or +86 18030005825 for a replacement or repair.

Q: Is this module compatible with AC 800M High Integrity?

No. The PM856K01 is for standard AC 800M. For high integrity, you need a different processor. Always check your controller documentation.

Q: How do I replace the internal battery?

Open the module cover, locate the 1/2 AA lithium battery, and swap it. Recharge time for an empty battery is about 7 hours. Use only 3.6 V lithium, 950 mAh.

Buying Guide – How to Choose the Right Processor Module

Check your controller model: PM856K01 fits AC 800M. Not for AC 800M HI or older Advant systems.
Count your I/O: If you have more than 12 S800 units, plan for optical ModuleBus or additional clusters.
Communication needs: Need modem? Use COM3. Need service port? COM4. Both Ethernet ports are 10 Mbit half duplex.
Backup time: Internal battery gives 48 h. For weeks or months, add SB821 or SB822 external batteries.
Power budget: Module uses 5 W typical. Add ModuleBus and CEX-Bus loads. Max 10 W with full supply.
Spares strategy: Keep one kit per critical cabinet. 12–24 hour shipping reduces downtime risk.
Warranty: 12 months is standard. Register your purchase for faster support.
Contact us: sales@powergearx.com or +86 18030005825 for help choosing.